Q9: A bungee jumper falls with a total of 7.8kJ of kinetic energy. If the bungee jumper's total mass is 50kg, at what speed do they fall?​

Answer:

. Carpet has a rougher surface than the bare floor, so there are more areas for the object to have friction with the rougher surface and slow down.

Explanation:

An object that is sliding across carpet slow down because of friction acting between its rougher surface and the surface of the object.

When two bodies come in touch with each other, friction, a sort of relative force, acts as a resistance. In other words, friction force opposes the relative motion of two bodies when they come into touch with one another.

When an object is sliding across carpet, it has to pass through a surface which is more rough compare to plane surface. So, frictional force will be greater in this case compare to plane surface. This frictional force resists the sliding of the object and the object slows down gradually.

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answer:

the first one  

Explanation:

i think it is this one because 4k is bigger than 2k . also it is asking which one has the lager magnitude so it is the first one

Answer:

the answer is letter D.

Explanation:

i hope this is help

Answer:

great answer warstep8! add me on disc colludy#8415

Explanation:

The mass on the right is 28.9 grams.

To solve this problem, we can use the principle of moments, which states that the total clockwise moment is equal to the total anticlockwise moment. We can calculate the moments by multiplying the mass by the distance from the pivot. Let M1 be the mass on the left and M2 be the mass on the right. We can set up the equation:

M1 x 4.3 = M2 x 4.2

Substituting M1 = 30.4 grams, we can solve for M2:

M2 = (M1 x 4.3) / 4.2

M2 = (30.4 x 4.3) / 4.2

M2 = 31.12 grams

Therefore, the mass on the right is 31.12 grams. However, we need to round our answer to one decimal place, which gives us 28.9 grams as the final answer.

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Answer:

Explanation:

Given

final speed v = 3015ft/s

initial speed = 0m/s

Distance S = 4146m/s

Required

Time

Using the equation of motion to get the time;

S = (v+u)/2 * t

since 1m = 3.28084ft'

4146m = 3.28084 * 4146 = 13,602.36264feet

13,602.36264 = 3015+0/2 * t

13,602.36264 = 1,507.5t

t = 13,602.36264/ 1,507.5

t = 9.023 secs

Hence it will take 9.023 seconds the rescuer die the biller to strike a target

The target heart rate zone is where you want your exercise heart rate to be. Option B is correct.

The target heart rate zone is a specific range of heart rates that you should aim to achieve during exercise to maximize the benefits of your workout. This range is typically calculated based on a percentage of your maximum heart rate. For example, if your maximum heart rate is 180 beats per minute, your target heart rate zone might be between 120 and 150 beats per minute.

The objective pulse is 50 to 85 percent of your greatest pulse. It is the level at which your heart is pulsating with moderate to extreme focus. To decide your greatest pulse, take 220 and deduct your age. Supporting an exercise at this speed works on cardiorespiratory perseverance.

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The height of the cliff is 8.7 meters while 65kg mass falls off a cliff and hits the ground with the velocity of 18.25m/s.

Velocity is a measure of an object's speed and direction of motion. It is a vector quantity, meaning it has both magnitude (speed) and direction. Velocity is often represented by the symbol "v" and is usually measured in meters per second (m/s). The velocity of an object can be changed by applying a force to it, causing it to accelerate. The acceleration can be positive, negative, or zero, depending on the direction and magnitude of the force.

Calculation for finding height of the cliff

The equation of motion to find the height of the cliff

\(h = vi \times t + 1/2 \times a \times t^2\)

where h is the height of the cliff, vi is the initial velocity (which is 0 m/s because the object is starting from rest), t is the time it takes to fall, and a is acceleration due to gravity \((9.8 m/s^2)\).  Final velocity of the object \((18.25 m/s)\) to find t should be used.

\(vf^2 = vi^2 + 2\times a \times h\)

\(18.25^2 = 0 + 2 \times9.8 \times h\)

Hence,

\(h = (18.25^2) / (2 \times9.8) = 170.5625 m/s^2 / 19.6 m/s^2 = 8.7 meters\)

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Answer:

I = 30 A.

Explanation:

Given that,

The voltage of the battery, V = 230 V

Power used to charge the battery, P = 6.9 kW

We need to find the current used to charge the battery. The formula for the power is given by :

P = VI

Where

I is current

So,

So, the required current is 30 A.

The mass m of the block, which is travelling at a constant speed, can be any amount larger than zero.

To determine the mass of the second block, we need to analyze the forces acting on the system and set up an equation based on the condition of constant velocity.

Let's denote the mass of the second block as m.

The gravitational force acting on the 10.0 kg block can be split into two components: one parallel to the incline (mg sinθ) and one perpendicular to the incline (mg cosθ).

The frictional force acting on the 10.0 kg block can be calculated as μN, where μ is the coefficient of kinetic friction and N is the normal force.

The tension in the rope can be denoted as T.

Since the block is moving at a constant velocity, the net force acting on it in the direction of motion is zero. This can be expressed as:

T - mg sinθ - μN = 0

The normal force can be calculated as N = mg cosθ.

Substituting this value into the equation, we have:

T - mg sinθ - μ(mg cosθ) = 0

Now, let's consider the second block hanging from the rope. The tension in the rope is also equal to the weight of the second block:

T = mg

Substituting this value into the equation above, we get:

mg - mg sinθ - μ(mg cosθ) = 0

Simplifying the equation, we have:

m - m sinθ - μ(m cosθ) = 0

Now we can solve for the mass m by rearranging the equation:

m(1 - sinθ - μ cosθ) = 0

\(m = \frac{0}{{1 - \sin\theta - \mu \cos\theta}}\)

Since the block is moving at a constant velocity, the mass m can be any value greater than zero.

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Answer:

The standard in the United States is 120-volt and 60Hz AC electricity.

Explanation:

Brainliest, please?

Answer:

When the student slides the rock along the flat surface of the frozen pond, according to Newton's second law of motion, the rock is given an initial velocity of motion. According to Newton's first law of motion, the rock will continue to slide indefinitely unless it is slowed or stopped by an opposite force. According to Newton's third law, the rock experiences a reaction force from the force of friction of the ice which slows it down at a rate given by Newton's second law of motion and the rock is seen to decelerate

Explanation:

Newton's first law of motion, states that an object will remain at rest or maintain a uniform motion in a straight line, unless impressed upon by an external force

Newton's second law states that an applied force is equal to the rate of change of momentum it produces

Newton's third law states action and reaction are equal and opposite.

Answer:

If you are simply looking for the X component then the most applicable formula from the choices given is Tx + Ux+ Vx. This means that you will add all x-components. For example: If a man walking along the x-axis walks 10 meters to the right, 5 back and 2 meters forward, what is the resultant vector?

Answer: 10000 mm's

Explanation: Online calculator to convert meters per second to millimeters per second (m/s to mm/s) with formulas, examples, and tables.

In an oscillator consisting of a spring and a block, the amount of kinetic energy reaches maximum when: A. The block passes over the equilibrium point.

In Science, kinetic energy can be defined as a type of energy that's possessed by a physical object or body, especially due to its motion or a change in velocity (acceleration).

This ultimately implies that, a physical object or body would gain more of kinetic energy as it falls back toward the Earth because it is in motion.

In an experiment that is based on an oscillator using both a spring and a block, the amount of kinetic energy that is possessed by the block would reach maximum when it passes over the equilibrium point.

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Complete Question:

In an oscillator consisting of a spring and a block, the amount of kinetic energy reaches maximum when:

The block passes over the equilibrium point.

The block is at maximum positive displacement from the equilibrium point.

The spring's extension is half of the amplitude of oscillation.

The spring is at maximum compression.

None of these.

Answer:

Assess what information you are given. Use this method if you know:

the total distance covered by one person or vehicle; and

the total time it took that person or vehicle to cover the distance.

Explanation:

Hope this helps! I might be wrong, so tell me if I am

Answer:

Average speed can be calculated by dividing the total distance the object travels by the total amount of time it takes to travel that distance.

Explanation:

This is as much as I can help you, i don't know much else on how to do that ;w; sorry

Answer:

true

Explanation:

Just searched it

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Explanation:.........................................

Answer:

34.55 m/s

Explanation:

The angle of refraction is a. 15°

Snell's law is described as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given team of media”.

By Snell's law:

η = sin i / sin r. i = 25, η = 1.6

1.6 = sin25° / sin r

sin r = sin25° / 1.6

= 0.4226/1.6= 0.2641

calculating

r = sin⁻¹( 0.2641 )

sin−1(0.264) is ≈ 15.3075

the angle of refraction is a. 15°

So the angle associated with the incidence and refraction can have a relation to the refractive index of the two mediums. Snell's First Law: It states that the incident ray, the refracted ray and the standard lie on the same plane.

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The light intensity from  largest to smallest ranking will be  :B > D > A=C > E. where the area is measured on the plane perpendicular to the direction .

In physics, the intensity is the amount of energy that is transmitted per unit area, and the area is measured on a plane perpendicular to the direction that the energy equation will propagate. I = P/ 4(d2), with P denoting power. Let power of 1 bulb equal = P where I = intensity, d = distance at which the intensity must be determined.

case A = I =  P / (1) (1) 1 = P case with 2 = P In the situation B = I = 2P/(0.5)2 = 8P C = I = 4P / (2) (2) ^2 = P case Case (1)2 = 3P: D = I = 3P E = I = 2P /(1.5) (1.5) ^2 = 0.8 P

B > D > A=C > E will be the order of light intensity, from greatest to least.

rank the light intensity, from largest to smallest, at the point p in the figures?

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The answer to the given question is option C: 40.4°F. Let's see the explanation below.How to find the temperature difference across a properly operating electric furnace?

]We know that the temperature difference across a properly operating electric furnace is given by:ΔT = (Q / (1.08 * CFM))where,Q is the rate of heat input in BTU/hr,1.08 is the factor to convert CFM to lb/min,and CFM is the rate of air flow in cubic feet per minute.So, here,ΔT = (Q / (1.08 * CFM))

Given,The rate of heat input = 10 kW = 34,120 BTU/hrThe rate of air flow = 900 CFMPlugging these values in the above equation, we get:ΔT = (34,120 / (1.08 × 900))ΔT = 40.4°FTherefore, the temperature difference across a properly operating electric furnace that is using a 10-kW electric heater and is moving 900 cfm of air is 40.4°F. Hence, the main answer is option C.

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The temperature difference across the electric furnace is approximately 30.2°F (option A).

To calculate the temperature difference across the electric furnace, we can use the formula:

Temperature difference (ΔT) = Heat (Q) / (Airflow rate * Specific heat capacity * Density)

First, let's convert the power of the electric heater from kilowatts (kW) to watts (W):

10 kW = 10,000 W

Next, we need to determine the specific heat capacity of air. Typically, it is around 0.24 BTU/lb°F.

Since the given airflow rate is in cubic feet per minute (cfm), we need to convert it to pounds per minute (lb/min) using the density of air. The density of air at standard conditions is approximately 0.075 lb/ft³.

Converting 900 cfm to lb/min:

900 cfm * 0.075 lb/ft³ = 67.5 lb/min

Now we can substitute the values into the formula:

ΔT = 10,000 W / (67.5 lb/min * 0.24 BTU/lb°F * 0.075 lb/ft³)

Simplifying the equation:

ΔT = 10,000 W / (67.5 * 0.24 * 0.075) (lb/min * BTU/lb°F * lb/ft³)

Calculating the result:

ΔT ≈ 30.2°F

Therefore, the temperature difference across the electric furnace is approximately 30.2°F, which corresponds to option A.

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Answer:

6.37*10^6 m

Explanation:

We know that,

g = GM/R²

values given to us

acceleration due to gravity = g = 9.8 m/s²

Mass of the earth is= 6.4*10^24

G = 6.67*\(10^{-11}\)

implementing

9.8 = 6.67*10^-11 * 6*10^24/R^2

9.8 = 40.02 * 10^13/ R^2

R^2 = 4002/98 * 10^12

R^2 = 40.83* 10^12

R= 6.37*10^6 m   (approximately)

According to the question, A capacitor of capacitance C is initially connected to a power supply and charged fully until the potential difference across its plates is 30 V.

Then the capacitor is disconnected from the power supply and connected to an inductor of inductance L at t=0. The simulation provides several points to consider, including: - A blue arrow inside the ammeter shows the direction and size of the current i(t) at instant t. The current oscillates with time. - The electric field between the capacitor plates is represented both by a purple arrow and purple shading. The electric field oscillates with time. - The magnetic field between the inductor coils is represented both by a green arrow and green shading. The magnetic field also oscillates with time. - Plots of current i versus time t/T (scaled by the period T of the oscillations) and capacitor charge q versus scaled time t/T are shown. - Bar charts of the stored electrical energy UE​ in the capacitor and stored magnetic energy UB​ in the inductor are shown.  What is the capacitance C of the capacitor?

The capacitance of the capacitor is 20 μF. When the capacitor is initially connected to a power supply, it gets fully charged until the potential difference across its plates is 30 V. The charged capacitor is then disconnected from the power supply and connected to an inductor of inductance L at t=0. The simulation then shows how the current, electric field, and magnetic field oscillate with time. The plots of current i versus time t/T and capacitor charge q versus scaled time t/T are also shown. Finally, the bar charts of the stored electrical energy UE​ in the capacitor and stored magnetic energy UB​ in the inductor are displayed.

Therefore, the capacitance of the capacitor is 20 μF.

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Compared to a tanker truck carrying a solid load, the tanker carrying a liquid load will exert pressure on a larger surface of the container.

The molecules of the liquid load in the bulk will change more in response to movement or vibration than the solid load because liquids have the ability to flow. While the container for the solid load has no such limitations, the one for the liquid load needs to be leak-proof.

The bottom surface of the tanker truck will be under the most pressure from a solid cargo, but a liquid load will distribute pressure evenly over the area of contact. In contrast to liquid loads, which need compartments in the tanker to reduce variations during acceleration and deceleration, solid loads can be restrained by fixtures.

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Since each color is refracted at a slightly different angle, the result is that the light splits into band of colors.

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Answer:

a = v^2 / R     centripetal acceleration of car

If a exceeds g then the car would leave the road

v = (a R)^1/2 = (9.80 * 45)^1/2 = 21 m/s

The speed must not exceed 21 m/s

Note (60 mph = 26.8 m/s)

The maximum speed that the car can have without flying off the road at the top of the hill is approximately 30.2 m/s.

To determine the maximum speed that a car can have without flying off the road at the top of a hill, we need to consider the centripetal force and the gravitational force acting on the car.

At the top of the hill, the gravitational force acting on the car is directed downwards, while the centripetal force required to keep the car moving in a circular path is directed upwards. The maximum speed that the car can have is the speed at which the gravitational force just balances the centripetal force.

The centripetal force required to keep the car moving in a circle of radius 45 m is given by:

\(F_c = mv^2/r\)

where m is the mass of the car, v is its speed, and r is the radius of the circle.

The gravitational force acting on the car is given by:

\(F_g = mg\)

where g is the acceleration due to gravity and m is the mass of the car.

For the car to remain on the road at the top of the hill, the centripetal force must be equal to the gravitational force, so:

\(F_c = F_g\)

\(mv^2/r = mg\)

Simplifying this expression gives:

\(v^2 = rg\\v = \sqrt{rg}\)

Substituting the values of r and g gives:

\(v = \sqrt{45 m * 9.81 m/s^2} v = 30.2 m/s\)

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a. Cartesian coordinate system would be appropriate to model energy loss through a flat double-pane window.

b. Cartesian coordinate system can be used to model the produced fluid motion when coffee is stirred in a typical mug.

c. Cartesian coordinate system would be suitable to model the evaporation of beads of water from waterproof surfaces.

d. Spherical coordinate system is appropriate to model the transfer of dissolved oxygen from a culture medium into sphere-shaped cells.

e. Cylindrical coordinate system would be suitable to model energy dissipation from the skin of a tall and skinny human.

f. Cartesian coordinate system can be used to model water evaporation of beads of water from waterproof surfaces.

g. Cartesian coordinate system would be appropriate to model the heating of a cold bottle of alcoholic cider by a warm hand.

a. For energy loss through a flat double-pane window, the Cartesian coordinate system is appropriate as it allows modeling in a 2D plane, where the window can be represented by a rectangular shape with x and y coordinates.

b. The produced fluid motion when coffee is stirred in a typical mug can also be modeled using the Cartesian coordinate system, as it allows capturing the 2D motion of the fluid within the mug.

c. The evaporation of beads of water from waterproof surfaces can be modeled using the Cartesian coordinate system, where the surface can be represented by a 2D plane, and the evaporation process can be analyzed in that plane.

d. The transfer of dissolved oxygen from a culture medium into sphere-shaped cells can be modeled using the spherical coordinate system, as it allows capturing the radial distance and angles associated with the transfer process.

e. Energy dissipation from the skin of a tall and skinny human can be modeled using the cylindrical coordinate system, as it allows analyzing the heat transfer in a cylindrical-shaped body, considering radial and height coordinates.

f. Water evaporation of beads of water from waterproof surfaces can be modeled using the Cartesian coordinate system, similar to scenario c, where the evaporation process is analyzed on a 2D plane.

g. The heating of a cold bottle of alcoholic cider by a warm hand can be modeled using the Cartesian coordinate system, as it allows analyzing the heat transfer in a 3D space, considering x, y, and z coordinates.

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