A 10-N toy rocket blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, the total mechanical energy of the rocket-Earth system is 140 J
To what vertical height above the ground does it rise, assuming no air resistance? A) 1.0 m
B) 10 m
C) 14 m
D) 24 m
B
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To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the
A) force of contact is reduced. B) relative velocity is less. C) time of contact is increased. D) time of contact is decreased. E) none of the above
Two cooks standing side by side in a restaurant pull their beaters out of the dough at the same instant. A glob of dough flies off each beater. Each glob lands on the top of a tin the same horizontal distance away and at its initial height. However, one lands later than the other. The explanation is that they left the beaters at angles ?1 and ?2 such that:
A.
B.
.C.
.D.
E.
The process of planet formation in the early solar system is best described by which of the following terms?
A) precipitation B) consolidation C) condensation D) crystallization
Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is and a life span of 75 years
A) 3 × 109 beats B) 3 × 108 beats C) 3 × 1010 beats D) 3 × 107 beats