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Answer:

The truck has more momentum

Explanation:

The truck has more momentum as its mass is heavier than the bicycle.

To calculate momentum the formula is

P=mv

If the mass is greater then the momentum will increase assuming the velocity is the same

Answer:

1500m/s

Explanation:

d=180000

t=120

units have to be converted into SI Units

Average Speed = (Total distance)/(Total Time)

Average Speed= (180000)/(120)

Answer: D

Explanation:

Answer:

D)uses the energy inside an atom's nucleus to generate electricity

Explanation:

it was on my reading passage

Answer:

A. seismic wave

Explanation:

Because a seismic wave is an elastic wave in the earth produced by an earthquake. And a electromagnetic wave is vibrations between an electric field and a magnetic field.

A student is studying a type of wave. Is it a light wave?, This question will help the student determine if it is an electromagnetic wave.

Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.

When we pass white light through a prism, as white light enters in the prism all the colors having different wavelength travels with different velocity in the prism due to that there is separation of colors from the white light. Therefore we get different colors of white light in the prism this phenomenon is know as dispersion of light.

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a)

When a plastic rod is rubbed with wool, charging by friction occurs.

This is one of the three mechanisms of charging an object: in this particular case, as the rod is rubbed with the wool, electrons jump from the wool to the rod.

As a result, the plastic rod will remain with an excess of electrons (negative charge), while the wool will remain with a lack of electrons (positive charge).

However, the number of electrons gained by the rod is equal to the number of electrons given off by the wool: therefore, the total net charge of the system rod + cloth has not changed.

b)

When the rod touches sphere A, some electrons are transferred from the rod to the sphere (this method of charging is called charging by conduction).

Then, the sphere A will also remain negatively charged, as well as the plastic rod.

Later, the rod is brought close to sphere A without touching it: here, the electrons in the rod repel the electrons in the sphere (like charges repel each other), so the rod and the sphere will repel each other.

c)

Before part b), the negative charge on the plastic rod was equal to the positive charge on the wool.

After part b), the plastic rod has given off part of its electrons to sphere A. As a result, the negative charge on the plastic rod will be now less than the positive charge on the wool.

Therefore, the net charge of the rod + wool system will now be positive.

d)

The electrostatic force between two charged object is:

- Attractive if the charges on the objects have opposite sign

- Repulsive if the charges on the objects have same sign

Since sphere A is charged negatively, when it is brought close to sphere B, the electrons in sphere B will be attracted on the opposite side relative to sphere A, while the positive charges will migrate close to sphere A. Therefore, the two spheres will attract each other, since opposite charges attract each other.

e)

When the plastic rod (which is negatively charged) touches sphere B, some electrons are transferred to sphere B (charging by induction). As a result, charge B will also be negatively charged now, as it has an excess of electrons.

At the same time, sphere A is also negatively charged. Therefore, as like charges repel each other, this means that the two spheres will now repel each other.

f)

The net charge of the rod and the two spheres is negative.

In fact, the electrons given off by the rod to the two spheres were initially on the rod itself: this means that the total net charge of the rod + 2 spheres is equal to the net charge on the rod before the process.

Since the net charge on the rod before the process was negative, then the net charge of the system consisting of the rod + 2 spheres must be negative as well.

g)

When a glass rod is rubbed with silk, charging by friction occurs, similar to part a). However in this case, the glass rod gives off electrons to the silk: therefore, the glass rod remains positively charged.

Later, the glass rod touches sphere B: as a result, positive charge is transferred from the rod to sphere B, so sphere B will remain positively charged.

In the meantime, sphere A is negatively charged: since opposite charges attract each other, this means that now sphere A and sphere B will attract each other.

h)

When the two spheres are moved a bit further apart, the attractive force between them decreases a bit. In fact, the electrostatic force between two charged objects is given by

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1, q2 are the  charges on the two objects

r is the separation between the objects

As we can see, the force is inversely proportional to the square of the distance: therefore, if the separation between the spheres increases, the force will decrease.

Answer: the leaves remainined apart after the charged was removed

Explanation:

Answer:

40 degrees

Explanation:

The angle is reflected at the same degree.

Answer:

Y-X

Explanation:

Answer:

B

Explanation:

Answer:

F=I/Δt

F=2000/7

F=285.7 N

Explanation:

Final answer:

Explanation:

The student is asking a physics question related to the concept of impulse and force. Impulse, represented by the product of force and time, is equivalent to the change in momentum of an object. The question involves calculating the force applied by Troy when he pushes on a car for 7 seconds, with a given impulse of 2000 kg·m/s.

To find the force applied, we use the formula for impulse: impulse = force × time. Thus, force can be calculated by dividing the impulse by the time over which the force is applied. Given that the impulse is 2000 kg·m/s and the time is 7 seconds, the force applied by Troy can be calculated as:

Force = Impulse / Time = 2000 kg·m/s / 7 s = 285.71 N

Therefore, the force Troy applies to the car is 285.71 Newtons.

Explanation:

Given that,

Runner 1 runs 14 miles in 3 hours. His average speed is given by :

[tex]v_1=\dfrac{14\ miles}{3\ h}=4.67\ mph[/tex]

Runner 2 runs 16 miles in 4 hours. His average speed is given by :

[tex]v_2=\dfrac{16\ miles}{4\ h}=4\ mph[/tex]

Runner 3 runs 15 miles in 6 hours. His average speed is given by :

[tex]v_3=\dfrac{15\ miles}{6\ h}=2.5\ mph[/tex]

Total distance covered by all three runners, D = 14 + 16 +15 = 45 miles  

Total time taken, t = 3 + 4 + 6 = 13 hours

The average speed of all the runners together  is given by :

[tex]V=\dfrac{45\ miles}{13\ h}\\\\V=3.46\ mph[/tex]

Hence, this is the required solution.        

Final answer:

When a light bulb filament is at the focal point of a convex lens, parallel light rays emerge. The convex lens refracts the light so that rays diverge within the lens and exit parallel, creating a focused beam used in devices like flashlights.

Explanation:

When a light bulb filament is placed at the focal point of a convex lens, the light rays that emerge from the other side are parallel light rays. This effect is due to the properties of convex lenses and their interaction with light. In a convex lens, parallel rays of light are refracted in such a way that they converge at the lens's focal point. Conversely, when a light source is placed at that focal point, the rays diverge within the lens, but then leave the lens parallel to each other. This phenomenon is utilized in various devices such as flashlights, lighthouses, and traffic lights to create a focused and directional beam of light. Option C

The science behind this involves the law of refraction, which dictates that light changes direction when it passes through materials of different densities, like air and glass. In the case of the convex lens, the curvature of the lens and its refractive properties cause the light rays from the focal point to exit parallel. This design ensures that the output beam spreads minimally, providing a strong, directional source of light.

Answer:

1: mass

2:weight

3: gravity increases

4: it decreases

Hope this helps:)

Explanation:

Answer:

Mass, Weight, Strength Increases, and Weight decreases

Explanation:

Got them right on Edge

Answer:

D. Evidence supporting the theory slowly accumulated

Explanation:

If a theory is accepted over time, it is because other theories were proved wrong and the other theory is accepted because evidence proved them right or wrong.

Answer:

D Evidence supporting the theory slowly accumulated. Is the right answer.

Explanation:If a theory is accepted over time, it is because other theories were proved wrong and the other theory is accepted because evidence proved them right or wrong.

Plese give brainliest

Answer:

6 km

Explanation:

speed of Aaron, v = 8 km/hr

speed of Sam, v' = 6 km/hr

time 15 min = 0.15 hr longer than the other

Let the distance covered by both of them is d.

Let the time taken by Aaron is t and the time taken by Sam is t + 0.25

use the formula of distance = speed x time

For Aaron:

d = 8 x t ..... (1)

For Sam:

d = 6 ( t + 0.25) ..... (2)

From (1) and (2)

8 x t = 6 (t + 0.25)

8 t = 6t + 1.5

2t = 1.5

t = 0.75 hour

So, the distance traveled by both is 8 x 0.75 = 6 km.

When a child compresses a spring toy, potential energy is stored. When the spring is released, the potential energy transforms to kinetic energy. The force the child applies is variable and directly related to the restoring forces of the spring.

When a child plays with a spring toy, it experiences a Energy transformations of energy: kinetic energy to potential energy and vice versa.

When the child first compresses the spring, the child is doing work on the toy, and as a result, the spring stores potential energy.

When the spring is released, it transforms the stored potential energy to kinetic energy as it bounces back.

This is a demonstration of the law of conservation of energy as total energy is conserved in the system.

The force applied by the child is variable because it changes depending on whether the spring is being compressed or released.

The restoring forces developed inside the spring will be proportional to the displacement: F = -kx, where 'k' is the spring constant and 'x' is the displacement.

A graph of these forces would be a straight line passing through the origin, with the slope equal to 'k'.

The force applied by the child to compress or stretch the spring is directly related to the variable tension or compression forces in the spring which are responsible for its restoration back to its original shape.

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Answer: be alert for pedestrians near the bus.

Explanation: Due to road accidents many Governments around the world has adopted and put in place certain rules and regulations with regards to road safety, this is so to prevent the or reduce the chances of accidents happening.

Road safety rules are rules and guidelines put in place by Government in order to prevent road accidents and maintain a free flow of traffic. An example of such rules is 'be alert for pedestrians near the bus ' when approaching a local bus that is stopped.

What to do when you see a stopped local bus is;

Be alert for pedestrians near the bus.

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Answer:

No change in mass number occurs in beta minus decay

Explanation:

Answer:

Explanation:

No change in mass number occurs in beta minus decay

Answer:

you are the bus driver

Answer:

energy increases, frequency increases

Explanation:

As the amplitude of a wave increases, so does the energy it carries, with the energy of a wave being proportional to the square of its amplitude. This relationship is true for various types of waves, including electromagnetic, mechanical, and sound waves. Doubling the amplitude of a wave results in a fourfold increase in its energy, highlighting a quadratic relationship.

What happens to the energy carried in the transverse wave as the amplitude increases? As the amplitude of a wave increases, the energy carried by the wave also increases. This principle applies to various types of waves, including sound waves, water waves, and electromagnetic waves. The relationship between a wave's energy and its amplitude is quadratic; meaning that if the amplitude of a wave is doubled, the energy it carries increases by a factor of four. This is because the energy of a wave is proportional to the square of its amplitude (E² or B²).

For instance, with electromagnetic waves, increasing the amplitude of the electric field (E) and magnetic field (B) results in a significant increase in both the energy density and the energy flux of the wave. This principle is also observed in mechanical waves, such as those on a guitar string or in the air as sound waves, where the amplitude of the wave is related to physical quantities like pressure.

The fact that the intensity of a wave increases fourfold with a doubling of amplitude might seem to challenge the conservation of energy. However, there's no violation occurring; rather, it's an inherent characteristic of wave behavior, allowing for greater energy transmission with increased amplitude.

Answer:

Explanation:

I would say all of them are affected by gravity- everything on the planet of earth is affected by gravity it pushes everything back down, however, if I had to make a guess I would say baseball because there is more gravity applied to the force of the ball than there is used in any other game listed.

Answer:

The bowlingball because it is the heavest which will cause it to fall faster thus showing it is the most affected by gravity.

Explanation:

It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s

Explanation:

Given:

Acceleration, a = -17 ft/s²

Distance, s  = 175 ft

Final velocity, v = 0

Time, t = ?

Initial speed, u = ?

We know:

v² - u² = 2as

(0)² - (u)² = 2 X - 17 X 175

u² = 5950

u = 77.14 ft/s

To calculate time:

v = u + at

0 = 77.14 - 17 X t

17t = 77.14

t = 4.58 sec

Therefore, It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s

After the driver of a car slams on the brakes, which causes the car to stop after traveling 175 ft with a slow down rate of 17 ft/s², we have:

a) The car stops after 4.54 s.

b) The car's initial speed is 77.14 ft/s.

We can calculate the time at which the car stops with the following kinematic equation:

[tex] v_{f} = v_{i} + at [/tex]   (1)

Where:                

t: is the time =?

[tex] v_{i}[/tex]: is the initial velocity

[tex] v_{f}[/tex]: is the final velocity = 0 (the car stops)

a: is the acceleration = -17 ft/s² (the minus sign is because the car is slowing down its speed)    

First, we need to find the initial velocity.

[tex]v_{i}^{2} = v_{f}^{2} - 2ad[/tex]

Where:    

d: is the distance traveled = 175 ft

Then, the initial velocity is:

[tex]v_{i} = \sqrt{v_{f}^{2} - 2ad} = \sqrt{-2(-17 ft/s^{2})175 ft} = 77.14 ft/s[/tex]  

Hence, the initial velocity is 77.14 ft/s.

Now, the time at which the car stops is (eq 1):

[tex] t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 77.14 ft/s}{-17 ft/s^{2}} = 4.54 s [/tex]

Therefore, the car stops after 4.54 s.

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Answer:

Increase

Explanation:

The acceleration will increase more if all the friction were removed from ramp.

Acceleration is the rate of change of velocity with time.

Frictional force is a force that opposes motion of a body.

Answer:

If friction were removed from the ramp, the acceleration of the skateboarder will increase.

Explanation:

The new electrostatic force will be 9 times greater than the original force.

Coulomb's law, a fundamental principle in electrostatics, describes the relationship between the force F between two point charges q₁ and q₂ separated by a distance r. It states that F is directly proportional to the product of the charges and inversely proportional to the square of the distance, mathematically expressed as F = k * (q₁ * q₂) / r², where k is the electrostatic constant.

According to Coulomb's law, the electrostatic force between two charged objects is inversely proportional to the square of the distance between them. If the distance between Objects 1 and 2 is changed to one-third the original value, the new electrostatic force will be 9 times greater than the original force.

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Answer:

Refraction

Explanation:

Refraction is a phenomenon typical of light waves. It occurs when a ray of light passes through the interface between two mediums: when doing so, the ray of light changes speed and also changes direction, according to Snell's Law:

[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]

where

[tex]n_1, n_2[/tex] are the index of refraction of the first and second medium, respectively

[tex]\theta_1, \theta_2[/tex] are the angle of incidence and refraction, respectively

When white light enters a prism, therefore, it undergoes refraction, and it changes direction.

However, the index of refraction of a material, n, depends also on the wavelength of the light. In particular, the shorter the wavelength, the higher the index of refraction.

This means that as white light enters a prism, the different wavelengths contained in the white light are refracted at different angles: as a result, the 7 colors of light will separate, and that is why we observe the rainbow when white light enters a prism.

Answer:

force=mass×acceleration

The boy and  the bike  accelerating at 5.875 m/s^2.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Given parameters:

Total mass of the boy and  the bike : m = 40 kg.

Net horizontal force = 235 N.

Now according to Newton's 2nd law of motion:

Force = mass × acceleration

⇒ acceleration = Force /mass

⇒ acceleration = 235/40 m/s^2

⇒ acceleration = 5.875 m/s^2.

Hence, they are accelerating at 5.875 m/s^2.

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Galileo's discovery shows that, to an observer on Earth, Venus has phases just like Earth's moon. This observation provide support for the heliocentric model of the solar system as follows:

Galileo's observation that Venus has phases supported the heliocentric model because this could only occur if Venus was orbiting the Sun, as predicted by the heliocentric model. The observation contradicted the geocentric model, which predicted that Venus would always appear in the same phase.

Galileo's observation that Venus has phases like the Moon was crucial in supporting a heliocentric model of the solar system. In the heliocentric model, the Earth and other planets revolve around the Sun. If this model was correct, Venus should show different phases as it moves around the Sun, similar to our Moon's phases as viewed from Earth. Conversely, in a geocentric model, where Earth is at the center of the universe, Venus would always be seen in the same phase, which was contrary to Galileo's observations. Therefore, Galileo's findings gave strong support to the heliocentric model, further solidifying the theory which is accepted as fact today.

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Answer:

Vacuum. A sound vacuum was created, i believe.