31. The resistance of an object depends on length, cross-sectional area, resistivity of the material the object is made of, and the temperature. What happens to the resistance of a copper wire when it is heated? * 1 point

A. decreases
B. remains the same
C. increases
D. any of the above  

32. Force is a quantity that may cause an object to move, it is the product of an object’s mass and its acceleration. Which of the following is the unit of force? * 1 point

A. Joule
B. Newton
C. second
D. meter

33. Newton’s Second Law of Motion is the Law of Acceleration. According to this Law, what is the relationship of acceleration to the mass of an object? * 1 point

A. Inversely proportional
B. Directly proportional
C. Are always equal
D. no relationship exists

34. A 4kg box is pushed to the right and accelerated at a rate of 2.5m/s2. Solve for the applied force. * 1 point

A. 10N, right
B. 10N, left
C. 1.6J, right
D. 1.6J, left

35. Centripetal force is not a fundamental force. It depends only on the net force applied to a body that keeps the body moving in uniform circular motion. The following are applications of centripetal force EXCEPT: * 1 point

A. a car turning in a banked road
B. a car turning on a level road
C. a rotating room in an amusement park D. a centrifuge separating components​