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(I WILL GIVE YOU BRAINLIEST) A bodybuilder lifts a certain weight up and down. If the body builder does it in less time, which of these statements is most accurate?
A) The body builder uses both the same energy and power.
B) The body builder uses both more energy and more power.
C) The body builder uses the same energy and but more power.
D) The body builder uses the same power and but more energy.


Students in a physical education class practiced rope climbing. Students gripped a rope that hung from the ceiling and lifted themselves up the rope using only their arms. What must be measured to determine the power output of the climbers?
A) tension on the rope and the final height
B) body mass, final height, and the tension on the rope
C) tension on the rope and the time required to complete the climb
D) body mass, final height, and the time required to complete the climb



Which of these would be the best definition of energy?
A) the ability to do work
B) the development of a future source of fuel
C) the feeling one gets from drinking caffeine
D) the feeling one feels after riding a roller coaster

Respuesta :

AL2006

A bodybuilder lifts a certain weight up and down.  If he does the same thing again but in less time, then he uses the same energy but more power. (C)

Students in a physical education class practiced rope climbing. Students gripped a rope that hung from the ceiling and lifted themselves up the rope using their arms. To determine the power output of a climber, his body mass or weight, final height, and the time required to complete the climb must be measured. (D)

From this particular list, the best definition of energy would be "the ability to do work". (A)

1.

The correct choice is

C) The body builder uses the same energy and but more power.

Energy depends on the weight and height to which it is being raised. since the weight and height being raised remains unchanged, hence the energy remains unchanged.

Power is given as

Power = Energy/time

for the same energy, as the time decreases, the power will increase.

2.

The correct choice is

D) body mass, final height, and the time required to complete the climb.

Energy spent by a climber is same as the gravitational potential energy gained by the climber.

Since  PE = mgh

So to determine the energy , we need body mass of climber and the final height.

Power output is given as

Power = Energy/time

3.

The correct choice is

A) the ability to do work

By definition, Ability to do work is known as energy.

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