QUESTION 1 An object moves at a constant speed around a circular track Whose radius is 3 m. The mass of the object is 3 kg and the speed is 2 m/s. What is the centripetal force? O 3 N O4N OSN OGN QUESTION 2 Which of the following most appropriately describes the centripetal force for an object of mass m, speed v, and radius r? O The centripetal force is the product of m squared and v and is inversely proportional to r O The centripetal force is the product of m and v squared and is inversely proportional to r O The centripetal force is the product at m squared and v and is proportional to r, O The centripetal force is the product of m and v and is proportional to rsquared, QUESTION 3 If the net work done by external nonconservative forces is zero, what is the principle of conservation of mechanical energy? 0 The total kinetic energy remains constant along the path of an object, O The total mechanical energy remains constant along the path of an object. O The total potential energy remains constant along the path of an object O The total mechanical energy changes along the path of an object, QUESTION 4 Suppose you are in an accelerated elevator, Your weight on earth is 700 N. If the acceleration is the same as the earth's gravitational acceleration, what is your apparent weight? 0 zero N O 600M 0 roorv laooN QUESTION 5 Which of the following statements is false for describing work done by a constant force? O The unit of work is the same as that of energy. If the angle between the force f and the displacement d is zero, the work done Wis W = fd. O If the constant force is parallel to the displacement, the work is zero. O The work is a scalar quantity. QUESTION 6 If the height of an object is 5 m and its mass is 3 kg, what is the gravitational potential energy of this object? Here, the gravitational acceleration g is given by 10 m/s. O 120 J 130 J O 140 J O 150 J QUESTION 7 Which one of the following units is correct regarding the centripetal acceleration of an object? O Meter per second squared Meter per second cubed O Meter cubed per second O Meter squared per second QUESTION 8 If a 2 kg object travels at a constant speed of 3 m/s, what is the kinetic energy of the object? 0 6 J 0 7 J O 8 J 0 9 JQUESTION 9' Which one of the following statements is false regarding a uniform circular motion of an object? O The centripetal acceleration of the object is changing. O The velocity ofthe object is changing. O The speed of the object is not changing. O The direction of the acceleration points toward the center of the circle. QUESTION 10 Which one of the following units does not express the unit of work? Q Joule O Erg 0 Newton 0 Ftlb