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Crank
2 years ago
11

Help please

Physics
1 answer:
Anarel [89]2 years ago
4 0

Answer:

1) D, 2) D, 3) B, 4) B, 5) C

Explanation:

You are asked to select the correct answer

1)  The conservation of energy is one of the most important principles of physics that allows solving countless problems in life.

the correct answer is D

2) when a body falls, the gravitational potential energy is transformed into kinetic energy and both are transformed into thermal energy

the correct answer is D

3) When the gravitational potential energy is maximum, the kinetic energy is minimum and when the kinetic energy is maximum, the gravitational energy is minimum.

Correct answer B

4) speed is defined by

         v = x / t

so the correct answer is B in the SI system

5) when we repeat a measurement several times, the random or statistical errors decrease, therefore the confidence of the measurement increases.

The correct answer is C

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Humans have never created any new living species.

So far, the only one who can do that is You Know Who.
3 0
3 years ago
In the vertical jump, an athlete starts from crouch and jumps upward to reach as high as possible. Even the best athletes spend
Mumz [18]

Answer:

The ratio of the time he is above ymax /2 to the time it takes him to go from the floor to that height = 0.707

Explanation:

The mathematical derivation and steps is as shown in the attached file.

3 0
3 years ago
A car moving at a velocity of 25m/s, so how much distance it will travel in 5 seconds?
denpristay [2]

Answer:

125 meters

Explanation:

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3 0
3 years ago
Alexis walked 1.5 km to her house in 0.5 hours. What is Alexis’ speed?
katrin2010 [14]

Answer:

Speed = 3 [km/h]

Explanation:

To solve this problem we must use the definition of speed which relates the distance traveled for a while.

Distance = 1.5 [km] = 1500 [m].

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Speed = Distance/time

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4 0
2 years ago
Jonathan must lift a 3000n rock using a lever. jonathan uses 300n of force to push down on the lever to move the rock. what is t
-Dominant- [34]
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The effort instead is the force applied in input to the lever in order to lift the rock:
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So, the ratio is 10:1.
3 0
3 years ago
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