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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

Two factors that greatly affect air resistance on falling objects are frontal area and

A) mass. B) weight. C) speed.

Physics & Space Science

The work of surface water does all of the following except

A) erosion. B) deposition. C) land subsidence. D) delta formation.

Physics & Space Science