True usally quizlet teachers get there work from there
Answer:
time=4, answer choice A
time=5.5, answer choice B
Explanation:
This is taken from the kinematic equation, v=vo+(1/2)at^2
Velocity at time 4 = 30+(2.5)(4)^2
Velocity at time 5.5 = 30+(2.5)(5.5)^2
Velocity at time 4 seconds = 70 m/s
Velocity at time 5.5 seconds = 105.63 m/s
Supposing these are the choices,
a. taking in a greater amount of energy than is released by the body
b. taking in a lesser amount of energy than is released by the body
c. balancing the amount of energy that is taken in with the amount of energy that is released by the body
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d. none of the above
If we assume they are talking about a person who is with in an ideal body weight range than
c. is the correct answer.
Answer A will make you gain weight, B will make lose weight.
To fully complete the answer we would have to assume that the person has moderate exercise in their life style to maintain muscle mass.</span><u />
The weight/force of the object is F = mg = (5.00 kg)(9.81 m/s^2) = 49.05 N
The work done in moving the object is W = Fd = (49.05 N)(3.00 m) = 147.15 J
The power required to accomplish this work in 2.50 s is P = W/t = 147.15 J / 2.50 s = 58.86 Watts
Power requirement increases with increased weight and increased distance, but decreases with increased time.
