The position of a particle as it moves along the x axis is given for t> 0 by x = (t3? 3t2 + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0)?
A. 3 m
B. 4 m
C. 8 m
D. 2 m
E. 7 m
Answer: B
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The following images show six objects in our solar system. Rank the objects from left to right based on their average distance from the Sun, from farthest to closest. (Not to scale.)
Which of the following statements about Venus is not correct?
A. The Sun's gravitational pull on Venus equals Venus' gravitational pull on the Sun. B. There is a net force acting on Venus. C. Venus is accelerating toward the Sun. D. There is no gravity on the surface of Venus.
A 3.00-kg ball has zero potential and kinetic energy. Maria drops the ball into a 10.0-m-deep well. After the ball comes to a stop in the mud, the sum of its potential and kinetic energy is:
a. zero. b. 294 J. c. ?294 J. d. 588 J. e. ?588 J.
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 400 m (1/4 mile). What is the speed of the race car at the end of the run?
a. 32 m/s c. 64 m/s b. 40 m/s d. 80 m/s