A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following is/are negative?
a. the speed of the car
b. the average velocity of the car
c. the average acceleration of the car
d. all of the above
c
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You lift a book with your hand in such a way that it moves up at constant speed. While it is moving, what is the total work done on the book?
a) mg × ?r b) FHAND × ?r c) (FHAND + mg) × ?r d) zero e) none of the above
Two factors that greatly affect air resistance on falling objects are frontal area and
A) mass. B) weight. C) speed.
A piece of aluminum with a mass of 1.0 kg and density of 2700 kg/m3 is suspended from a light cord and then completely immersed in a container of water having density 1000 kg/m3
(a) Determine the volume of the piece of aluminum. (b) Determine the tension in the cord when the aluminum is immersed in the container of water.
The work of surface water does all of the following except
A) erosion. B) deposition. C) land subsidence. D) delta formation.