1. by studying ________ , the _______ of a galaxy can be
determined
options for first blank: density waves or rotational curve
options for 2nd black:
a. diameter
b. shape,
c. relativity
d. mass
2. A _

Answer:

8.6

Explanation:

The net force exerted on the car during the 10 second time interval was: 750,000 N.

Here's why: Force is the result of the interaction between two objects, according to Newton's second law, which states that F = ma, where F is the force, m is the object's mass, and a is its acceleration. When calculating force, we must first convert velocity to acceleration, which is accomplished by dividing the change in velocity by the time interval.

We have a = (25 - 0) / 10 = 2.5 m/s² because the car speeds up from a standstill to 25 m/s in 10 seconds. We can determine the net force acting on the car using Newton's second law. Because the car's mass is 3000 kg and its acceleration is 2.5 m/s², the net force exerted on the car is:F = maF = 3000 kg × 2.5 m/s²F = 7500 N

Therefore, the net force exerted on the car is 7500 N.

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Answer:

4200N

Explanation:

Force = acceleration × mass

f=3.5×1200

f=4200

From the calculation, there is a net force that acts on the car and then the acceleration that is produced by the net force is 0.296 m/s^2.

The term net force refers to the force that is acting on an object that makes it to move. We have to recall that the force of friction is the force the limits the motion of an object. In other words, it is the force of friction that makes a body not to be able to move and this must be overcome by the forward force when it is greater than the friction force.

Now;

Mass of the car = 1352 kg

Forward force = 7820 N

Coefficient of friction = 0.56

Frictional force = μmg

= 0.56 * 1352 kg * 9.8 m/s^2

= 7419.8 N

Net force = Forward force - Frictional force

= 7820 N -  7419.8 N

= 400.2 N

Then;

Net force = ma

m = mass

a = acceleration

a = Net force/m

a = 400.2 N/ 1352 kg

a = 0.296 m/s^2

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Answer:

The North Pole.

Explanation:

According to the Lenz's law of electromagnetic induction, an induced elemagnetic force tends to give rise to the current. In reaction, this current's magnetic field try to oppose any replacement in the magnetic flux.

So,  as per the law of Lenz's electromagnetic induction, when the current passes in a coil in anti-clockwise direction, this will produce the opposite end of the coil in the north pole.

So, the correct answer is north pole.

Answer:

its C

Explanation:

The statement that describes the relationship between the environment and the collective health of the world is; "what is good for the environment is good for our health."

Humans must maintain a very good interaction with their environment because the interaction between man and his environment is very necessary for healthy living.

Man depends on water, air etc to sustain life. These are part of the natural environment, when these are polluted due to neglect of the environment, human health is adversely affected.

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The numbers of years that Pripyat been unoccupied is 36 years.

"The Chernobyl tragedy damaged the ecology irreparably, and the effects will continue for thousands of years." Due to excessive radiation levels, the area was evacuated, and Pripyat, a once-vibrant city of 50,000 people that included many nuclear plant workers, was left in ruins. Its urban landscape become covered with trees and vines over time.

Therefore, According to experts, the region won't be secure for at least 3,000 years; nevertheless, other people think this estimate is overly optimistic. A 2016 research states that it is anticipated that the reactor site won't be livable for at least 20,000 years.

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Answer:

Student science investigatory projects provide students practical experience in using the scientific method and help stimulate their interest in scientific inquiry. Given the benefits society can realise from professional scientific inquiry, such goals in themselves have importance.

A force known as friction prevents movement between two surfaces that are in touch. A static frictional force acts on an object when it is at rest on a surface and stops it from moving. An external force that is stronger than the static frictional force.

However, the frictional force switches from static to kinetic as soon as the item begins to move. Although it can do so when moving quickly or under a lot of stress, the coefficient of kinetic friction is typically lower than the coefficient of static friction. This implies that the amount of force needed to overcome friction may rise when the object moves faster or is subjected to more force.

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The intensity of sound can be calculated using the formula: Intensity (I) = Power (P) / Area (A).Plugging in the given values, we have: Intensity (I) = 8.8 × 10^-4 W / 5.0 m^2.

Calculating this expression gives us an intensity of 1.76 × 10^-4 W/m^2.

Therefore, the correct answer is: 1.6 × 10^-4 W/m^2.

The intensity of sound represents the amount of power per unit area. It is calculated by dividing the power of the sound wave by the area through which it is passing. In this case, the given power is 8.8 × 10^-4 W, and the area is 5.0 m^2. Dividing the power by the area gives us an intensity of 1.76 × 10^-4 W/m^2.

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We have that for the Question "" it can be said that how long will it take the car to come to a full stop and the car lengths before a stop is

From the question we are told

Your car can brake with a deceleration of 6 m/s2. The car is initially going at 40 m/s.

a) How long will it take the car to come to a full stop?  

b) If the car is 5 meters long, about how many car lengths should be kept between you and the car in front of you (assume the car in front of you comes to a stop immediately).

Generally the equation for the Velocity is mathematically given as

\(v=u+at\\\\Therefore\\\\40=0+6t\\\\t=6.667s\\\\\)

b)

s=ut+1/2at^2

Therefore

\(S=0+1/2(6)(6.7)^2\\\\S=134.67m\)

Therefore

The car lengths before a stop is

L=134.67m/5

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Explanation:

w = m.g

g is Gravity acceleration . on surface of Earth it's

9.8 m/s² ≈ 10 m/s²

By applying the correspondent change of scale, we will see that Earth should be placed 214.8m away from the scale sun.

The real radius of the Sun is:

R = 696,340 km

And the radius of the scale Sun is 1m, then we have the relation:

1m = 696,340 km

1 = (1m/696,340 km)

Now, the real distance between the Sun and Earth is:

d = 149,600,000 km

If we apply the change of scale we have above, we will get:

d =  149,600,000 km*(1m/696,340 km) = 214.8m

So the Earth should be placed at 214.8m of the ball that represents the sun.

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Answer:

⁸

Explanation:

electric potential

I think so

The ratio of the mass density of girder a to the mass density of girder b is 1/2.

It is possible to measure a materials density by how closely it is packed. The mass per unit volume is how it is formally defined. The density is expressed as follows: = m/V, where m is the object's mass and V is its volume.

A material substance's density is defined as its mass per unit volume. D is density, M is mass, and V is volume, and the formula for density is d = M/V. Most often, grammes per cubic centimetre are used to express density.

Since they are made of same material, their mass density is same. Their mass is different but not mass density.

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The diagram that represents all forces acting on the box on the inclined plane is found in the attachment.

The forces acting on the box on the inclined plane are as follows:

Gravitational force: acting straight down and equal to the weight of the box, which can be calculated as:

W = m*g, where m is the mass of the box (55 kg) and g is the acceleration due to gravity (9.8 m/s^2).

Normal force: acting perpendicular to the surface and equal in magnitude but opposite in direction to the component of the gravity force that is perpendicular to the surface. This force prevents the box from sinking into the surface.

Frictional force: acting parallel to the surface and opposite in direction to the component of the gravity force that is parallel to the surface. This force opposes the motion of the box and is the force that causes it to accelerate.

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Answer:

a= 4m/s^2

Explanation:

Fnet =200N

m=50kg

a=?

Fnet = ma

200=50a then divide both sides by 50 to get acceleration

Taking into account the Newton's second law, the acceleration of the box is 4 \(\frac{m}{s^{2} }\).

In first place, you have to know that Newton's second law, called the fundamental law or fundamental principle of dynamics, states that a body accelerates if a force is applied to it.

Then, the amount of force necessary is proportional to the acceleration that the body acquires, and the constant of proportionality  is the mass of the body.

Mathematically, Newton's second law is:

F= m×a

where:

In this case, you know:

Replacing in the Newton's second law:

200 N= 50 kg×a

Solving:

a=200 N÷ 50 kg

a= 4 \(\frac{m}{s^{2} }\)

In summary, the acceleration of the box is 4 \(\frac{m}{s^{2} }\).

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The measurement of the length of a swimming pool, the SI unit is meters (m).

In the International System of Units (SI), the standard unit for measuring length is the meter (m). The meter is defined as the distance travelled by light in a vacuum during a specific time interval. It is widely used for measuring various lengths, including the length of a swimming pool.

When measuring the length of a swimming pool, you would typically use meters as the unit of measurement. This is because meters provide a convenient and standardized way to express distances. A swimming pool's length can be measured by physically stretching a measuring tape or using a measuring device calibrated in meters.

Using the SI unit of meters allows for consistency and compatibility when communicating measurements across different contexts and disciplines. It enables accurate and precise comparisons, calculations, and analysis of length-related quantities.

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Answer:

the time taken for the box to stop is 3.6 s.

Explanation:

Given;

initial speed with which the box was pushed, u = 5 m/s

time taken for the box to stop, t = 1.5 s

Assuming the box is moving at constant acceleration, a;

\(a = \frac{u}{t} \\\\a = \frac{5}{1.5} \\\\a = 3.33 \ m/s\)

When the box is pushed a speed of 12 m/s, the time taken for the box to stop is calculated as;

\(t = \frac{v}{a} \\\\t = \frac{12}{3.33} \\\\t = 3.6 \ s\)

Therefore, the time taken for the box to stop is 3.6 s.

Luke would be looking towards the left side of the frame, which is where Boba Fett is positioned.

If Boba Fett is composed on the right side of the frame looking towards the screen right, and Luke Skywalker is also composed on the right side of the frame, then according to the conventions of continuity editing, Luke would be looking towards the left side of the frame, which is where Boba Fett is positioned.

In continuity editing, the camera angle and the positioning of characters in the frame are used to create a sense of spatial continuity that helps the viewer understand the relationships between the characters and the environment. The convention of the 180-degree rule is often used in continuity editing to maintain spatial consistency between shots, which means that the camera should stay on one side of an imaginary line drawn between two characters so that they always appear in the same orientation to each other.

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The transfer of thermal energy by conduction only happens in solid molecules.

Thermal conduction is the process whereby thermal energy travels through the molecules of solids.

The travel or transfer can happen between molecules of the same solid or between molecules of different solids if there is contact between them.

Thermal conduction is opposed to convection and radiation where heat travels through air and liquid respectively.

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Answer:

Pedal / Front Gear = 18 / 9 = 2

Front Gear /Rear Gear = 9 / 4 = 2 1/4

Rear Gear / Wheel = 4 / 33 = .121

2 * 2 1/4 * .121 = ,55

C) Seems true

Answer:

8.9 g/cm^3

Explanation:

density = mass/volume

volume = length * width * height

volume = (8.4 cm)(5.5 cm)(4.6 cm)

volume = 212.52 cm^3

mass = 1896 g

density = (1896 g)/(212.52 cm^3)

density = 8.9 g/cm^3

Answer:

The nature of volcanic eruptions is highly dependent on magma viscosity and also on dissolved gas content. ... long it takes the treacle to flow from one end of a boiling tube to the other.

The apparent cubical expansivity of the liquid is approximately -0.0025 0.02 °C⁻¹.

The apparent cubical expansivity (β) of a substance can be calculated using the formula β = (ΔV/V) / ΔT, where ΔV is the change in volume, V is the initial volume, and ΔT is the change in temperature.

In this scenario, the initial volume (V) of the liquid is 25 mL, and the change in volume (ΔV) is 5 mL. The change in temperature (ΔT) is the difference between the final temperature (100°C) and the initial temperature (20°C), which is 80°C.

Plugging these values into the formula, we have:

β = (5 mL / 25 mL) / 80°C

Simplifying this expression gives us:

β = 0.02 °C⁻¹ (cubic expansivity)

Therefore, he liquid's apparent cubical expansivity is around 0.02 °C⁻¹.

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The period of a wave with speed 351m/s and a wavelength of 4.20m is 0.012s

Wave is a disturbance created by a vibration of particles that travel through a medium from one position to another.

There are 2 type of waves, longitudinal and transverse waves.

Longitudinal wave is a type of wave which the virbation of the medium is parallel with the direction of the wave travels. Transverse wave is a wave which its vibration is perpendicular to the direction of the wave travels.

Wavelength (λ) is the distance between two identical successive point in one wave. Frequency (f) is the number of waves that pass through a  fixed point in a given period of time. Period (T) is the number of time needed for a wavelength to passes one fixed point.

The speed of a wave could be calculated by dividing the wavelength with the frequency of a wave.

v = λ . f

Knowing that period (T) is the reciprocal of frequency (f), hence:

v = λ/T

In the case, we could find the period of the wave by using the data given;

v = 351m/s

λ = 4.20m

T = ?

v = λ/T

351 m/s = 4.20m / T

T = 0.012s

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