PHYSICS HIGH SCHOOL

Waves are created when a source of _________ (force) causes a vibration.

Answers

Answer 1
Answer: The answer is "energy"

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A person throws a tennis ball 6 m/s straight up. How long does it take for it to come back to their hand?

Answers

Answer

1.2245 s


Explanation

Using the Newton's law of linear motion,

v = u + gt


where v ⇒ Final velocity

            u ⇒ initial velocity,

             t ⇒ time to reach maximum height.

             g ⇒ acceleration due to gravity.

v = u + at

v = 0 m/s

g = -9.8 m/s²  (negative because the velocity is decreasing)

0 = 6 + -9.8t

9.8t = 6

t = 0.612244898 s

This is the time to reach maximum height. It will take the same time to come back to the hand.

so total time = 0.612244898 × 2

                      = 1.2245 s
Best Answer: BY v = u -gt=>0 = 6 - 9.8 x t=>t = 0.61 secThus time it take to come back to hand (T) = 2t = 1.22 secLol I hope this helps because I had funning helping you XD

In a practical machine, the power output is _______ the power input. A. larger than
B. multiplied by
C. equal to
D. smaller than

Answers

The correct answer for the question that is being presented above is this one: "D. smaller than." In a practical machine, the power output is smaller than the power input. The power output is smaller than the power input as most of the energy usually has been converted to heat in the process.

Smaller than is the correct answer

a constant force of 391 n acts on a spacecraft of mass 7870 kg that has an initial velocity of 38 m/s. how far has the spacecraft traveled when it reaches a velocity of 4820 m/s?

Answers

Answer:

The distance travelled is 2.34*10^8 m.

Explanation:

The acceleration of the spacecraft is,

a=F/m

=391/7870 = 0.04968 m/s^2

The distance travelled,

d=v^2-v0^2/2a

=(4820)^2-(38)^2 / 2(0.04968)

=2.34*10^8 m.

Shear causes horizontal movement along a fault plane in a/n _______ fault. A. reverse B. strike-slip
C. normal
D. irregular

Answers

The answer is B. Strike slip fault. Shearing occurs when plates or blocks of rocks slide past each other in the opposite direction. This occurs at transform plate margins. An example is the San Andreas Fault running through California, USA. Compression occurs at reverse faults and tension at normal faults.
THE ANSWER IS B. STRIKE-SLIP

which of the following is not a projectile? a.a satellite b.a throw ball c.a ball on the ground d.a soaring arrow

Answers

c a ball on the ground
A projectile is known as an object that is thrown in the air or shot in the air....for example a rock that is thrown up from a tall building or a missile that is shot from a rocket launcher. A projectile is usually also considered an object that is thrown up and then comes back down.....using the examples above....if a rock is thrown up eventually it is going to have to come down....same thing for the missile.....

I believe the answer is B.

hope this helps :)

How far can a bus travel in 8 h at an average speed of 60 mph?

Answers

Answer:

480 mph

Explanation:

speed = 60 mph

time = 8 hours

distance = speed*time

             = 60*8

             = 480 mph
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