Mastery 1 Select the correct answer. A car traveling south is 200 kilometers from its starting point after 2 hours. What is the average velocity of the car? OA. 100 kilometers/hour south B. 200 kilometers/hour Oc. 200 kilometers/hour north OD. 100 ​

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Smallest intensity of a stimulus that you can detect 50 percent of the time is