You ride in an automobile traveling at 100 km/h. It comes to a stop over 0.5 seconds. You can be sure that
a. the car's engine has stopped.
b. a velocity acts.
c. friction between the tires and the road stopped it.
d. the car had a nonzero acceleration during that time.
e. none of the other answers is correct.
D
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A barge is 10 m wide and 60 m long and has vertical sides. The bottom of the boat is 1.2 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water of density 1000 kg/m3?
A) 3.5 MN B) 6.4 MN C) 6.8 MN D) 7.1 MN E) 9.5 MN
In U.S. customary units, air pressure is measured in pounds per square inch. In the metric system, it is measured in Pascals, and one Pascal is equal to
A. one newton per square centimeter. B. one newton per square meter. C. one metric ton per hectare. D. one pound per square foot. E. None of these choices are correct
Exclusion Principle: How many electrons can be found with principal quantum number n = 3 in a suitably heavy atom?
A. 18 B. 6 C. 20 D. 9
A cylinder rolls, without slipping, down an incline directly toward you. The contact interaction between the cylinder and the incline exerts a frictional torque on the cylinder. What is this torque’s direction?
A. Downward B. Away from you C. To your right D. To your left E. Some other direction (specify)