2 years ago

A rock falls off a cliff, its final velocity was 85m/s, how long did it fall before hitting the ground?

Physics

1 answer:

RoseWind [281]2 years ago

6 0

Answer:

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Explanation:

The expansion of the universe is the increase in distance between any two given ... Metric expansion is a key feature of Big Bang cosmology, is modeled mathematically with the ...

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2 years ago

A 17926-lb truck enters an emergency exit ramp at a speed of 75.6 ft/s. It travels for 6.4 s before its speed is reduced to 30.3

I am Lyosha [343]

Answer:

$F_{braking}=337299 pdl$

Explanation:

Impulse-Momentum relation:

$I=\Delta p\\ F_{total}*t=m(v_{f}-v{o})$

$F_{total}=-F_{braking}+mgsin{\theta}$

We solve the equations in order to find the braking force:

$F_{braking}=m(v_{o}-v{f})/t+mgsin{\theta}=17926(75.6-30.3)/6.4+17926*32.17*sin21.4=337299 pdl$

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3 years ago

an electron is moving with a speed of 0.85c in a direction opposite to that of photon. calculate the relative velocity of the el

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Answer:

1.85c

Explanation:

a photon moves at c, the electron is moving at 0.85c, and since they are moving in opposing directions, the relative speed would be 1.85c

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1 year ago

A main difference between gravitational and electric forces is that electrical forcesA. attract. B. repel or attract. C. obey th

Nadusha1986 [10]

Answer is :

repel or attract- B.

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3 years ago

The speed of a 4-kg ball with a momentum of 12 kg m/s is

alisha [4.7K]

Answer:

3 m/s

Explanation:

The momentum of an obejct is given by

$p=mv$

where

m is the mass of the object

v is the velocity of the object

For the ball in this problem, we know:

$p = 12 kg m/s$ is the momentum

$m=4 kg$ is the mass

Therefore, we can re-arrange the equation to find v, the velocity of the ball:

$v=\frac{p}{m}=\frac{12 kg m/s}{4 kg}=3 m/s$

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3 years ago