PHYSICS HIGH SCHOOL

What is one way that fission and fusion are similar?

Answers

Answer 1
Answer: Well, they both start chain reactions and they are also both used in certain nuclear bombs. Also they are both natural processes that occur in the sun, where hydrogen fuses with helium atoms and then they split by the process of fission.

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Astronauts traveling toward Earth in a fastmovingspacecraft receive a radio signal from an
antenna on Earth. Compared to the frequency
and wavelength of the radio signal emitted from
the antenna, the radio signal received by the
astronauts has a
(1) lower frequency and a shorter wavelength
(2) lower frequency and a longer wavelength
(3) higher frequency and a shorter wavelength
(4) higher frequency and a longer wavelength

Answers

Compared to the frequency and wavelength of the radio signal emitted from
the antenna, the radio signal received by the astronauts has a (1) lower frequency and a shorter wavelength.

Answer:

3) Higher frequency and a shorter wavelength

Explanation:

The Doppler Effect occurs when the distance between the wave source and the observer is changing. As the astronauts move toward the source of the radio waves, the radio waves will reach them at a faster rate. The perceived frequency will be higher and the wavelength shorter.

Show that one ampere is equivalent to a flow of 6.25*10^18 elementary charges

Answers

It's not.  It's equivalent to the transfer of that many elementary charges every second .

The elementary charge (charge on an electron) is

                         1.60 x 10⁻¹⁹ coulomb / electron.

The number of electrons in a Coulomb is the reciprocal of that number.

                          6.25 x 10⁻¹⁸ electrons / Coulomb.

There's the number.  1 Coulomb per second is called 1 Ampere.

A ball of clay sinks when placed in water. The same piece of clay floats if it is made into the shape of a boat.Why does the clay float when made into the shape of a boat?
a. The clay is less dense when stretched into the shape of a boat.
b. The buoyant force is greater on the clay when it has a spherical shape.
c. The boat shape displaces a greater volume of water than the ball shape.
d. The weight of the clay boat is less than the weight of the clay ball.

Answers

The correct answer is definitely d. The weight of the clay boat is less than the weight of the clay ball.
In such situations, the point that we should take as a basis to resolve a question is weight. If the weight of clay is less than that of a clay ball, the clay will float.

Answer:

c. The boat shape displaces a greater volume of water than the ball shape.

Explanation:

You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

Answers

The force applied to pull an object is 200 N and the distance it sleds through the snow is 500 meters, so the amount of work done over here is 1,00,000 Nm.

What is Work?

When an external force moves an object over a distance, at least a fraction of that force must be exerted in the displacement's direction. This is known as work in physics. By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = f.d, to mathematically describe this idea.

According to the question, the given values are :

Distance, d = 500 meters

Force, f = 200 Newton

So the formula for work done= force× displacement

W = 200 × 500

W = 1,00,000 Nm

Hence, the work done over here is 1,00,000 Nm.

To get more information about Work :

brainly.com/question/28727910

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the answer will be u need to divide 500 by 200 so a force of 150 ig

A car moving with a velocity of 20 meters/second has1.8 * 105 joules of kinetic energy. What is the mass of the car?

Answers

Kinetic energy is the product of mass and the square of the velocity of the moving object. In this case, we substitute the given data, that is 1.8 x10^5 joules = m * (20 m/s2)^2. Extracting the mass, the mass of the car therefore is equal to 450 kg

Explanation :

Given that,

Velocity of the car, v = 20 m/s

Kinetic energy of the car, E_k=1.8* 10^5\ J

Kinetic energy is given by :

E_k=(1)/(2)mv^2

m=(2E_k)/(v^2)

So, m=(2* 1.8* 10^5\ J )/((20\ m/s)^2)

m = 900 kg

Hence, the mass of the car is 900 kg

Which of the following is not a manmade cause of global warming?

Answers

Well if climate change is one of the options then that would be it
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