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A 70 kg body will measure which of the following on the moon?

A. 70 x 2.0 = 140 lbs
B. 0 kg
C. 70 lbs
D. 70 x 0.17 (17%) = 11.9 kg
E. None of the above

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Concentric activation of a muscle entails:

A. Muscular activity as the muscle maintains its current length
B. Muscular activity as the muscle is shortened
C. A powerful contraction of a muscle following a rapid loading of that muscle
D. Muscular activity as the muscle is lengthened
E. Strange or unusual muscular activity

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Power is represented by which of the following equations?

A. F·V or W/t
B. F·t
C. ΔV/t
D. M·V
E. F·D

Answer :

1. e. none of the above (The body will measure the same, but its weight will be different due to the moon's lower gravity.) 2. d. muscular activity as the muscle maintains its current length 3. a. FV or W/t (Power is the product of force and velocity.)

1. The correct answer is e. none of the above. On the moon, the gravitational acceleration is about 1/6th of that on Earth. Therefore, a 70kg body on the moon would weigh less than 70kg, but not as low as any of the given options.

2. The correct answer is d. muscular activity as the muscle is lengthened. Concentric activation of a muscle refers to the muscular activity as the muscle is actively lengthened. This type of contraction occurs when the force generated by the muscle is less than the opposing force.

3. The correct answer is a. FV or W/t. Power is represented by the equation Power = Force x Velocity or Work / time. It represents the rate at which work is done or energy is transferred.

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