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4 years ago

Plz help,

Physics

1 answer:

Sav [38]4 years ago

7 0

Answer: False, the factors that can affect the weight are the mass of the planet and the radius of the planet.

Explanation:

First, we can write the weight as:

W = m*g

where m is the mass and g is the gravitational acceleration.

For example. g in the Earth is 9.8m/s^2, and g on Mars is 3.71 m/s^2, so you will weight more in Earth than on Mars, and Earth is closer to the Sun than Mars, so the statement is false.

Now, the gravitational acceleration depends primarily on the mass of the planet, this is because the gravitational force between two objects can be written as:

F = G*M*m/r^2

Where M is the mass of the planet, and m is your mass and r is the distance between you and the planet, if you are in the surface, r is the radius of the planet.

Here we can see that planets with more mass and smaller radius (more density) have the strongest gravitational force on any object near them.

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A 40kg rock is perched atop a cliff that is 50 m high. What is it’s potential energy?

LekaFEV [45]

Potential energy, is energy due to its position.

Given: Mass m = 40 Kg; Height h = 50 m

Required: Potential energy P.E = ?

Formula: P.E = mgh P.E = (40 Kg)(9.8 m/s²)(50 m)

P.E = 19,600 J

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4 years ago

Jesse celebrated his birthday yesterday by eating a giant birthday cake with 17 candles. What type of energy conversion ocurred

stepan [7]

Answer:

Im pretty sure its B

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3 years ago

An 8000-kg engine pulls a 40,000 kg train along a level track and gives it an acceleration a1 = 1.20 m/s 2 . What acceleration (

mel-nik [20]

a = F/(m1+m2)
1.2 = F/48,000
F = 57,600N

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a = 57,600/24,000
a = 2.4 m/s^2

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4 years ago

Minions are a happy color yellow. Which of the following statements about minions is correct?

likoan [24]

D all of the above
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3 years ago

Which of the following statements about electromagnetic waves in free space are true? (There could be more than one correct choi

Vanyuwa [196]

Answer:

The electric field carries the same mount of energy as the magnetic field

The frequency of the magnetic field is the same as the frequency of the electric field.

Explanation:

Let's analyze each option in detail:

The electric and magnetic fields have equal amplitudes. --> FALSE. In fact, the amplitudes of the electric and magnetic field are related by the equation:

$E=cB$

where

E is the amplitude of the electric field

B is the amplitude of the magnetic field

c is the speed of light

Therefore, from the equation we see that the amplitude of the electric field is much larger than that of the magnetic field.

The electric field carries the same mount of energy as the magnetic field. --> TRUE.

The energy carried by the electric field is:

$u_E = \frac{1}{2}\epsilon_0 E^2$

where $\epsilon_0$ is the vacuum permittivity.

The energy carried by the magnetic field is:

$u_B = \frac{1}{2\mu_0}B^2$

where $\mu_0$ is the vacuum permeability.

Given the following relationship:

$c=\frac{1}{\sqrt{\epsilon_0 \mu_0}}$

We can write

$E=cB=\frac{1}{\sqrt{\epsilon_0 \mu_0}}B$

$u_E = \frac{1}{2}\epsilon_0 (\frac{1}{\sqrt{\epsilon_0 \mu_0}}B)^2=\frac{1}{2\mu_0}B^2$

which means $u_E=u_B$ .

The electric field carries more energy than the magnetic field. --> FALSE, because in disagreement with the calculations above.

The frequency of the magnetic field is the same as the frequency of the electric field. --> TRUE. In an electromagnetic waves, electric field and magnetic field oscillate at the same frequency.

The frequency of the electric field is higher than the frequency of the magnetic field. --> FALSE, because in disagreement with the previous statement.

8 0

3 years ago