The correct response is: the system is closed, and the net external force is nonzero.
The object-earth system is closed because there are no external forces acting on the system, as all the forces are internal, i.e., the gravitational force between the object and the earth. However, the net external force is not zero because the object is accelerating due to the force of gravity. The net external force is equal to the weight of the object, which is given by W = mg, where m is the mass of the object and g is the acceleration due to gravity. Therefore, the net external force is F_net = mg = 5 kg x 9.8 m/s^2 = 49 N.
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Variable num is initially 2. the command num = num * 2 is typed and entered once; then the up-arrow key is pressed followed by enter, three times. what is num?
After executing the command "num = num * 2" once and pressing the up-arrow key followed by the enter key three times, the value of num will be 16. Initially, the value of num is 2. The command "num = num * 2" multiplies the current value of num by 2 and assigns the result back to num. So, after executing the command once, the value of num becomes 4 (2 * 2).
By pressing the up-arrow key followed by enter, the previous command "num = num * 2" is repeated. So, the second execution of the command multiplies the current value of num (which is 4) by 2, resulting in num being 8 (4 * 2).
Pressing the up-arrow key followed by enter again repeats the previous command, and the third execution multiplies the current value of num (which is 8) by 2, resulting in num being 16 (8 * 2).
Therefore, after executing the command "num = num * 2" once and pressing the up-arrow key followed by enter three times, the value of num will be 16.
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A cube has length of 7 cm a width of 8 cm and a height of 2 cm. What is its volume?
If the cube has a mass of 50 grams, what is its density?
Answer:
Volume = 112cm^2
Density = 0.45 g/cm^2 (2.s.f)
Explanation:
Volume of a cube is found by multiplying its height by its length by its width.
We are given the values: l = 7cm, w = 8cm, h = 2cm, so to find the volume we just need to multiply them all together:
V=lwh
V = (7)(8)(2)
The volume of the cube = 112cm^2
Density is found by dividing mass by volume.
We are given the mass (50 grams) and we have just found the Volume (112cm^2), so we can just divide them to find the density:
p (symbol for density) = m/v
p = (50)(112)
The density of the cube is 0.45 g/cm^2 (2.s.f.)
Hope this helped!
The volume of the gas is 18.8 L at 2.00 atm and 200.0K. If it's original volume was 300 L at 400.0k, what was original pressure?
Answer:
15.96atm
Explanation
According to general gas equation
P1V1/T1 = P2V2/T2
P1 and P2 are pressures
V1 and V2 are the volumes
T1 and T2 are the temperatures
Given
P2 = 2.00atm
V1 = 18.8L
v2 = 300l
t1 = 200k
T2 = 400K
Required
P1 = ?
Substitute
P1 =P2V2T1/T2 V1
P1 = 2 * 300*200/400*18.8
P1 = 120000/7520
P1 = 15.96atm'
Hence the original pressure is 15.96atm
if Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?
Answer:
10g
Explanation:
As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".
Though melting of tin isn't a chemical change, the same logic is applied here...
Hence,
The mass of tin will be 10 g itself...
Answer:
10g
Explanation:
The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.
Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.
The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.
Therefore, we are left with about the same mass of substance we started with which is 10g.
An object is dropped from a 42 m tall building. How long does it take to
reach the ground?
2.9 s
8.7 s
9.3 s
11.7 s
Answer:
2.9s
Explanation:
When object was dropped from some height, it displacement
h=v_i t+(at^2)/2=(gt^2)/2
So
t=√(2h/g)=√((2×42)/9.8)=2.9 s
Describe how you could show that the Earth has a magnetic field.
Answer:
Earth's magnetic field aligns the magnet in the compass with its north pole. A second method is to observe the night sky in the polar regions. Northern and Southern Lights are produced by the interaction of the Earth's magnetic field with solar radiation.
Hope this helps!!!
Edwin Hubble’s discovery of Cepheid variable stars in the Andromeda Nebula demonstrated that spiral galaxies were actually distant galaxies. What might have happened had Andromeda not contained any Cepheid variables? Imagine that you are an astronomer living at that time, and you are trying to find some other evidence that would decide between the "Nebular Hypothesis" and the "Island Universe Hypothesis." You have been granted a small amount of observing time on the world’s largest telescope, with no possibility of asking for more time.
Answer the following two questions with a paragraph:
Describe the research program that you would carry out with your precious telescope time. What data would it collect? How would this discriminate between hypotheses?
Why do you feel this program has the best chance of success?
I would conduct a research program to observe and analyze the spectra of galaxies to gather information about their composition and motion.
With my limited observing time on the world's largest telescope, I would focus on collecting spectral data from various galaxies. Spectroscopy allows astronomers to analyze the light emitted by celestial objects and identify the elements present in their composition. By observing the spectra of galaxies, I could look for distinct patterns or signatures that could differentiate between the two hypotheses.
In the case of the Nebular Hypothesis, which suggests that spiral galaxies are merely nebulae within our own Milky Way, the spectral data would likely exhibit similarities to known nebulae. It would show characteristic emission lines associated with ionized gases, such as hydrogen or oxygen. If this were the case, it would support the notion that spiral galaxies are part of our own galaxy.
On the other hand, if the spectral data revealed a different pattern, such as absorption lines indicative of stars or stellar processes, it would lend support to the Island Universe Hypothesis. This hypothesis proposes that spiral galaxies are distinct, independent entities scattered throughout the universe. The presence of absorption lines associated with specific chemical elements or molecules commonly found in stars would suggest that spiral galaxies are not just nebulae but actual galaxies in their own right.
By carefully analyzing the spectral data collected from various galaxies, I would be able to compare their compositions and identify any significant differences that would help discriminate between the two hypotheses. This research program offers the best chance of success because it leverages the power of spectroscopy to provide concrete evidence regarding the nature of spiral galaxies, regardless of the absence of Cepheid variables in Andromeda.
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The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Answer:
Rubber or plastic covers are bad conductors of electricity. So they do not allow the electric current to pass through it.
Explanation:
Rubber and plastic are bad conductors of electricity, therefore when handling a tool with a rubber handle, the electricity will not pass through it.
Answer:
rubber and plastic are insulators and are bad conductors of electricity
A golf ball (m = 52.0g) is hit by a club that makes an angle of 50.1◦ with the horizontal. The ball lands 167 m away on a flat fairway. The acceleration of gravity is 9.8 m/s^2.
Answer:
DeeExplanation:
Aindrops fall vertically at 4.5 m/s relative to the earth. what does an observer in a car moving at 22.0 m/s in a straight line measure as the velocity of the raindrops?
Air drops fall vertically at 4.5 m/s relative to the earth, the observer in the car would measure the velocity of the raindrops as 26.5 m/s.
To determine the velocity of the raindrops as observed by an observer in a moving car, we need to consider the relative motion between the car and the raindrops.
Given:
Velocity of the raindrops relative to the Earth (v_rain) = 4.5 m/s
Velocity of the car (v_car) = 22.0 m/s
The velocity observed by the observer in the car is the vector sum of the velocity of the raindrops relative to the Earth and the velocity of the car.
Velocity observed by the observer (v_obs) = v_rain + v_car
v_obs = 4.5 m/s + 22.0 m/s
v_obs = 26.5 m/s
Therefore, the observer in the car would measure the velocity of the raindrops as 26.5 m/s.
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a sphere of mass 5kg and volume 2×10-5completely immersed in water find the buoyant force exerted water
Answer:
Buoyant force exerted water = 0.196 Newton
Explanation:
Given:
Mass of sphere ball = 5 kg
Volume = 2 x 10⁻⁵
Find:
Buoyant force exerted water
Computation:
Buoyant force exerted water = Gravity due to acceleration x volume of object x density of given liquid
Buoyant force exerted water = 9.8 x 2 x 10⁻⁵ x 1000
Buoyant force exerted water = 0.196 Newton
how to find frictional force with the coefficient of friction
To find the frictional force using the coefficient of friction, multiply the coefficient (μ) by the normal force (N). The coefficient of friction represents the ratio of the force of friction between two surfaces, while the normal force is the force pressing the surfaces together.
The resulting frictional force (Ff) can be calculated using the equation Ff = μ * N. It's important to consider that the frictional force acts in the opposite direction of the applied force or the tendency of motion.
Determine the coefficient of friction (μ): The coefficient of friction is a dimensionless value that represents the ratio of the force of friction between two surfaces to the normal force pressing them together. It depends on the nature of the surfaces in contact. The coefficient of friction is typically denoted as μ.
Identify the normal force (N): The normal force is the force exerted by a surface perpendicular to the contact surface. It is equal to the weight of the object or the force pressing the surfaces together.
Calculate the frictional force (Ff): The frictional force can be calculated using the equation:
Ff = μ * N
Multiply the coefficient of friction (μ) by the normal force (N) to obtain the frictional force (Ff).
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What potential energy is acquired by a hammer with a mass of 0.75 kg when raised 0.35 m?
Answer:
0.75kg into gram = 0.75 * 1000 = 750g
potential energy = mgh
potential energy = 750 * 10 * 0.35
potential energy = 2625 joules
C
A downhill skier was able to move 560 meters in 25 seconds. What is the skie
answer to the nearest tenth of a meter per second.)
The skier's average speed is
m/s
Explanation:
Speed = distance / time
v = 560 m / 25 s
v = 22.4 m/s
Answer:
22.4
Explanation:
Hope this helps
S= 560m÷25s=22.4m/s
What is dramatic irony short answer?
A literary device known as dramatic irony occurs when the audience or the reader has a better understanding of the events or characters in a work than the characters themselves.
What is dramatic irony, and how can you spot it?dramatic irony Add to list Share. Dramatic irony is when a character in a Titanic movie leans on the balcony and exclaims, "It's so beautiful I could just die," immediately before the ship hits the iceberg. Dramatic irony arises when the audience is aware of information that the characters are not.
Why is it dramatic irony?Dramatic irony occurs when the audience is aware of a situation before some of the players are. This knowledge frequently creates a sense of suspense since we know the character(s) will eventually discover the truth.
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How far does a runner travel (in km) if she runs at an average of speed of 38.0km/hr for 30 min? Your answer needs to go to one space after the decimal point.
The distance travelled by the runner in 30 mins is 19.0km
In the given question the runner runs at an average speed of 38.0kmm/hr for 30 mins.
In order to calculate the distance we need to convert the time from minutes into hours
1 hour = 60 mins
∴ 30 mins = 30/60 = 0.5 hr
Now we have got speed and time in the same unit. Hence it will become easy for us to calculate the distance travelled by the runner in 30 mins.
By applying the formula to calculate the distance,
Distance = Speed × Time
Distance = 38.0 × 0.5 = 19.0 km
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which of the following provides evidence that a warming planet is related to human behavior (select all that apply; there are one to four possible correct answers)? scientists showing that increasing levels of carbon dioxide cannot impact our climate scientific research showing that temperatures have risen along with carbon dioxide emissions from the nineteenth century scientists agreeing that the earth can only sustain an atmospheric concentration of carbon of about 39,000 parts per million scientific discoveries that burning coal changes the climate by increasing the levels of carbon in the atmosphere
Discoveries that burning coal changes the climate by increasing the levels of carbon in the atmosphere provide evidence that a warming planet is related to human behavior, which causes global warming.
What is Global Warming?
The heating of the earth's surface is due to an increase in carbon content and another pollutant in the atmosphere that, traps the heat being radiated back by the earth's surface, which in turn increases the temperature.
What are pollutants?
Pollutants are a substance that increases the toxicity of something, such as air, water, land, etc., and thus contributes to pollution.
what is pollution?
Pollution is the contamination of the environment by toxic substances, such as nitrogen oxide, carbon monoxide, Ground level ozone, etc. that increase the toxicity of the environment and are hazardous for living organisms.
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Verify that each of the following expressions is a total differential, and find its primitive function: pini soclure gniwolloi adi soolava +1 (1) (x² + 2xy-y²)dx + (x²-2xy - y²)dy; (2) (2xcosy - y² sinx) dx + (2ycosx - x² siny) dy. 108
A total differential is an equation in which all the differentials can be integrated independently of each other. To verify that the given expressions are total differentials, we must check if they meet the conditions of being an exact differential function.The given expression is not an exact differential function.
According to the exact differential function, an expression dQ should be equal to the sum of two partial derivatives of the same function. i.e, dQ= dP+ dRA primitive function of an expression is obtained by integrating the given expression partially. Let's solve the given expressions, one by one:
1. Expression : (x² + 2xy-y²)dx + (x²-2xy - y²)dy. Now, we need to find the partial derivatives of the above function with respect to x and y.∂P/∂x = x² + 2xy - y² ∂Q/∂y = x² - 2xy - y².
On verifying, we get:∂P/∂x = ∂Q/∂y.
Hence, the given expression is an exact differential function.
To find the primitive function, we need to integrate any one of the partial derivatives with respect to x and other with respect to y.
∴ P(x,y) = ∫(x² + 2xy - y²)dx = x³/3 + x²y - xy² + C1 and ∴ Q(x,y) = ∫(x² - 2xy - y²)dy = x²y - y³/3 + C2.
Therefore, the primitive function of the expression is: P(x,y) = Q(x,y) = x³/3 + x²y - xy² - y³/3 + C2.
Expression : (2xcosy - y² sinx) dx + (2ycosx - x² siny) dy. Now, we need to find the partial derivatives of the above function with respect to x and y.∂P/∂x = 2cosy ∂Q/∂y = 2ycosx.
On verifying, we get:∂P/∂x ≠ ∂Q/∂y .
Hence, the given expression is not an exact differential function.
Therefore, there does not exist a primitive function for the given expression.
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What happens to gravitational potential energy as a rollercoaster moves down a hill? Question 4 options: It is converted to elastic potential energy It increases It is converted to kinetic energy It remains constant.
The gravitational potential energy as a rollercoaster converts to kinetic energy when it moves downhill.
What is kinetic energy?
The kinetic energy of an object or body is due to its motion. When the roller coaster moves downhill it accelerates, thus the gravitational potential energy as a rollercoaster converts to kinetic energy.
The gravitational potential energy of an object or body is due to its position above the ground.
Therefore, the gravitational potential energy as a rollercoaster converts to kinetic energy when it moves downhill.
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Explain the significance of the thermometer, the electric heater, and the power supply.
Answer:
This question appear incomplete
Explanation:
This question appear incomplete. However, the significance/functions of the "instruments" mentioned (in the completed question) can be predicted since these "instruments" generally have specialized function.
A thermometer is used to determine the temperature of a substance or an object. The electric heater uses electricity to produce heat (which can be utilized for different purposes). The power supply is used to supply electricity for instruments/appliances that may require electricity to function.
Derivation
law of
conservation
of momentum
Applying Newton's third law, these two impulsive forces are equal and opposite i.e. If the time of contact is t, the impulse of the force F21 is equal to the change in momentum of the first object. The impulse of force F12 is equal to the change in momentum of the second object.
MARK ME BRAINLISTA ferris wheel having a radius of 8 m has a velocity of 8 m / s. is there a danger of the riders flying off?
A ferris wheel having a radius of 8 m has a velocity of 8 m / s. is there a danger of the riders flying off . No, the ferris wheel is not moving too fast.
What is a velocity?
Velocity may be a vector quantity that refers to "the rate at which an object changes its position." Imagine an individual moving rapidly - one step forward and one step back - always returning to the original starting position. While this might end in a frenzy of activity, it might result in a zero velocity.
What is the two types of velocity?
Constant velocity: is that the speed at which an object travels equal displacements in equal times. Variable velocity: it's the speed at which an object cuts different displacements at different times.
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Use equations and physical relations to calculate the following variables for a parcel with the same starting conditions as done in class: a temperature of 30
∘
C and a dewpoint of 20
∘
C at 1000mb. Show your work or explain why you don't need an equation to solve for a particular variable. You may not use the skew-T to calculate the variables in this question. Assume adiabatic motion with no loss of water due to precipitation. c. At 500mb:T=−3.75
∘
C i. Actual vapor pressure (e) ii. Saturation vapor pressure (e
s
) iii. Actual mixing ratio (r) iv. Saturation mixing ratio (r
5
) v. Total water mixing ratio (r
T
) vi. Available supersaturation (S
A
) vii. Excess water mixing ratio (r
F
)
The variables for the given parcel with a temperature of 30°C and a dewpoint of 20°C at 1000mb are as follows:
i. Actual vapor pressure (e)
ii. Saturation vapor pressure (es)
iii. Actual mixing ratio (r)
iv. Saturation mixing ratio (r5)
v. Total water mixing ratio (rT)
vi. Available supersaturation (SA)
vii. Excess water mixing ratio (rF)
To calculate the variables, we can use the following equations and physical relations:
i. Actual vapor pressure (e):
We can use the Clausius-Clapeyron equation to calculate the actual vapor pressure:
e = es(T) * (rh/100)
where es(T) is the saturation vapor pressure at temperature T, and rh is the relative humidity.
ii. Saturation vapor pressure (es):
We can use the Arden Buck equation to calculate the saturation vapor pressure:
es = 6.112 * exp((17.67 * T)/(T + 243.5))
where T is the temperature in °C.
iii. Actual mixing ratio (r):
The actual mixing ratio can be calculated using the following equation:
r = (0.622 * e)/(p - e)
where e is the actual vapor pressure and p is the atmospheric pressure.
iv. Saturation mixing ratio (r5):
The saturation mixing ratio can be calculated using the following equation:
r5 = (0.622 * es)/(p - es)
v. Total water mixing ratio (rT):
The total water mixing ratio can be calculated by summing the actual mixing ratio and the excess water mixing ratio:
rT = r + rF
vi. Available supersaturation (SA):
The available supersaturation can be calculated using the following equation:
SA = (rT - r5)/r5 * 100
vii. Excess water mixing ratio (rF):
The excess water mixing ratio can be calculated by subtracting the saturation mixing ratio from the actual mixing ratio:
rF = r - r5
By using these equations and the given starting conditions, we can calculate the values of the variables mentioned above.
The calculations for the variables mentioned involve utilizing several equations and physical relations related to atmospheric thermodynamics. These equations are derived from fundamental principles and empirical relationships that describe the behavior of water vapor in the atmosphere. By applying these equations to the given conditions, we can determine values such as actual vapor pressure, saturation vapor pressure, actual mixing ratio, saturation mixing ratio, total water mixing ratio, available supersaturation, and excess water mixing ratio. These variables provide valuable information about the moisture content and saturation levels of the parcel of air being analyzed. Each equation serves a specific purpose in quantifying these properties and allows for a comprehensive understanding of the thermodynamic state of the parcel.
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Unlike secondary pollutants,
pollutants are
released directly into the air by natural processes or by human
activities
Answer:
True
Explanation:
what happens if an atom has fewer than 3 electrons in the outermost shell
Answer:
Explanation: the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet.
like calcium and sodium which have fewer electrons at their outer shell have the tendency to form ionic bonds by giving up their electrons.If the outer shell of an atom is filled, the atom will be stable but if the atom is unfilled its outer shell then it is unstable, and will usually form chemical bonds with other atoms to achieve stability.
boron is the example which have 3 electrons at its outermost shell.as after all the clarification it is all clear that what happen if there is 3 electrons at their outermost shell.thge electrons may lose its valency if it doesnot find any covalent bond.
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Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.10×10^6 N
, one at an angle 17.0 ∘
west of north, and the other at an angle 17.0 ∘
east of north, as they pull the tanker a distance 0.630 km
toward the north. What is the total work done by the two tugboats on the supertanker?
Express your answer in joules, to three significant figures.
To pull the tanker 0.630 km total work to be done is 1.871 × 10⁹ Joule.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
Resultant force acting on the tugboat = √2 × 2.10 × 10⁶ N.
To pull the tanker 0.630 km, that is, 630 m, work done = force × displacement
= √2 × 2.10 × 10⁶ N × 630 m
= 1871004543.01 Joule.
= 1.871 × 10⁹ Joule.
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Monochromatic light of wavelength 649 nm is incident on a narrow slit. On a screen 2.25 m away, the distance between the second diffraction minimum and the central maximum is 1.99 cm. (a) Calculate the angle of diffraction θ of the second minimum. (b) Find the width of the slit.
Answer:
a)0.51°
b)1.47×10^-4m
Explanation:
a)for a single slit experiment, the minima that has an angle of θ towards the centre needs to satisfy the expression below.
bsin(θ)= mλ.........................(*)
Where b= width of the slit
The distance on the screen from Central angle can be expressed as
Sin(θ)= y/d............. (**)
d and y is the horizontal distance between slit and screen
If we input eqn(**) into equation (*) we have
y= mλd/b................(z)
In order to find angle (θ) we have
(θ)= sin-(1.99×10^-2)/2.25
= 0.51°
Therefore, angle of diffraction θ of the second minimum is 0.51°
b)to find the width of the sloth using eqn(z) by substitute the values, we have
b= (2)(649×10^-9)(2.25)/1.99×10^-2
b= 1.47×10^-4m
Therefore, the width of the slit is 1.47×10^-4m
"The slumped area in this model supports grassy vegetation. What does this say about the speed of the mass movement, and why are there no trees growing in the slumped area?"
Slumped area only supports grassy vegetation and no trees can be grow on it.
A slump is a form of mass wasting that occurs when a rock layer moves at a short distance down a slope, this type of area is called slumped area. The speed of the mass movement at slumped area is slow i.e. few cm per year or meter per year.
There are no trees growing in the slumped area because trees required fixed land but the land moves at the slumped area so we can conclude that slumped area only supports grassy vegetation and no trees can be grow on it.
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Answer:
The grassy vegetation in the slumped soil indicates slow movement of material, and it appears recently enough that trees have not had time to establish themselves.
Explanation:
It likely moved gradually over a period ranging from days to years. Grassy vegetaion has been able to establish on the surface without any breaks or open soil visible, this is evidence of the gradual movement.
3. Conduction will occur between objects at different temperatures that are
A separated, but not in contact with each other
B in contact with each or separated
C in contact with each other, but not separated
a spring is used to fire two identical marbles directly upward. immediately after firing, the first marble has an initial velocity, v, and rises to a height h above the spring. the second marble has an initial velocity 4v. what distance above the spring does the second marble reach?
As per the given statement the max height attained by the second marble is 16 times of the max height of the first marble with the velocity of 4v.
What is velocity?It can be defined as the rate of change of the object's position with respect to a frame of reference and time. Its S.I unit is m/s.
To calculate the max height attained by the second marble we use the following formula
\(\frac{1}{2}\)m\(v^{2}\)=mgh
Rearranging the equation, we get
h=\(v^{2}\)/2g
For the first ball,
\(h_{1}\)max=\(v^{2}\)/ 2g
acc. to the given data
Initial velocity of first marble= v
and height attained = h
For the second ball,
Initial velocity of second marble= 4v
So attained height is?
h2max=v22 /2g
h2max=(4v)2/2g
h2max=16v2/2g
h2max=16×v2/2g now (h1max=v21/ 2g)
h2max=16×h1max
The max height of the second marble is 16 times of the max height of the first marble with 4v velocity.
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