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2 years ago

5

Which of the following is the cause of the change of seasons? A) the distance of a place from the Equator B) prevailing winds bl

owing across land or water C) the tilt of the Earth’s axis D) the rotation of the Earth

1 answer:

cupoosta [38]2 years ago

3 0

C. the tilt of the earth's axis <span />

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Which energy transformation occurs in an

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A motor takes in electricity from a cell or power source and then uses it to move components.

Therefore the answer is (1) Electrical to Mechanical

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3 years ago

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Please select the word from the list that best fits the definition Visualizes where items are located

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How are Earth and Venus similar? How is Venus different from Earth? (Provide two similarities and two differences.)

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Venus shares a similar size, surface composition, and has an atmosphere with a complex weather system. Venus is different from Earth because it spins the opposite direction of Earth and it’s rotation is very slow.

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2 years ago

If the distance between two masses is tripled, the gravitational force between changes by a factor of:_______

adell [148]

Answer:

option A

Explanation:

given,

distance between two masses is doubled

new distance, r' = 3 r

using gravitational force equation

$F = \dfrac{GMm}{r^2}$ ............(1)

new gravitational force

$F' = \dfrac{GMm}{r'^2}$

now from the given condition

$F' = \dfrac{GMm}{(3r)^2}$

$F' = \dfrac{GMm}{9r^2}$

$F' = \dfrac{1}{9}\dfrac{GMm}{r^2}$

now, from equation (1)

$F' = \dfrac{1}{9}F$

$\dfrac{F'}{F} = \dfrac{1}{9}$

now, the change in gravitational force factor is equal to $\dfrac{1}{9}$

Hence, the correct answer is option A

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3 years ago

A bicycle rim has a diameter of 0.65 m and a moment of inertia, measured about its center, of 0.21 kg⋅m2What is the mass of the

stepan [7]

Answer:

m = 1.99 kg = 2 kg

Explanation:

The moment of inertia of a bicycle rim about it's center is given by the following formula:

$I = mr^{2}\\$

where,

I = Moment of Inertia of the Bicycle Rim = 0.21 kg.m²

r = Radius of the Bicycle Rim = Diameter of the Bicycle Rim/2

r = 0.65 m/2 = 0.325 m

m = Mass of the Bicycle Rim = ?

Therefore,

$0.21\ kg.m^{2} = m(0.325\ m)^{2}\\m = \frac{0.21\ kg.m^{2}}{(0.325\ m)^{2}}\\$

<u>m = 1.99 kg = 2 kg</u>

3 0

2 years ago