The tension in the rope joining the two masses equals: Zero; Not zero, but less

Question

The tension in the rope joining the two masses equals: Zero; Not zero, but less than 200 N; Between 200 and 400 N; 400 N. Now imagine that the two masses are switched (i.e. 30 kg on the right and 20 kg on the left) all the other quantities remaining the same. What happens to the system's acceleration and to the tension in the rope joining the two masses? Acceleration remains the same, tension changes; Acceleration changes, tension remains the same; Acceleration and tension both remain the same; Acceleration and tension both change. A 1500-kg car is moving on a level circular track of radius 30 m at a constant speed of 50 m/s. Questions 30-32 refer to this situation. Which force is responsible for the centripetal acceleration of the car? Gravity Normal force; Static friction; Kinetic friction. The net force on the car is pointing: Tangential to the circular path; Inwards, towards the center of the circle; Outwards, away from the center of the circle; The net force is zero. What happens to the centripetal force on the car if its speed is doubled all other quantities remaining the same? The force: Halves; Stays the same; Doubles; Quadruples. A satellite is in an orbit around Earth with a period of 24 hours. This type of orbit is called: GPS-orbit; Geosynchronous orbit; Newtonian orbit; Retrograde orbit. The astronauts in the space shuttle are weightless because: There is no gravity at their location; They are in free fall; There is no centripetal force acting on them; The force of gravity is offset by the centrifugal force.

Explanation / Answer

30) C)

31) b)

32) d)

33) b)

34) d)

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