3 years ago

Which of the following is used to determine if a star is moving closer to Earth?

Physics

1 answer:

sergey [27]3 years ago

6 0

This is Doppler Shift

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Explain why a 10 kg stone and 1 kg stone dropped from the same height

11111nata11111 [884]

The acceleration of a body in a gravitational field is independent of its mass. Both the stones will fall with the same acceleration through the same height and hence they will strike the ground simultaneously.
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3 years ago

Three parachutists have the following masses: A: 50 kg, B: 40 kg, C: 75 kg Which one has the greatest terminal velocity?

allochka39001 [22]

Answer:

A: 50 kg

Explanation:

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3 years ago

A 250KG ROCKET HAS 1,953,125 JOULES OF ENERGY. HOW FAST IS IT<br>MOVING?

UNO [17]

Answer:

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4 years ago

A child’s toy that is made to shoot ping pong balls consists of a tube, a spring (k = 18 N/m) and a catch for the spring that ca

UkoKoshka [18]

Answer:

The height is 3.1m

Explanation:

Here we have a conservation of energy problem, we have a conversion form eslastic potencial energy to gravitational potencial energy, so:

$E_e=\frac{1}{2}K*x^2\\E_e=\frac{1}{2}18N/m*(9.5*10^{-2}m)^2\\E_e=0.081J$

then we have only gravitational potencial energy when the ball is at its maximun height.

$E_g=m*g*h$

because all the energy was transformed Eg=Ee

$h=\frac{0.081J}{9.8m/s^2*m}$

searching the web, the mass of a ping pong ball is 2.7 gr in average. so:

$h=\frac{0.081J}{9.8m/s^2*(2.7*10^{-3}kg)}\\h=3.1m$

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3 years ago

Why is the likelihood of amajor earthquake along the san andreas fault so worrisome??

Softa [21]

Because a lot of people live along the fault line and there would be lots of death and much property damage.

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