Question

1 hold a 20.0 kg box 1.50 meters above the floor for a time of 15.0 seconds. The weight of the box is 196 N. How much work do I do on the box? A) 294 Joules B) 30.0 Joules C) 19.6 Joules D) 0 Joules 11) In order to do work on an object A) the object must move. B) it is necessary that friction be present. C) the force doing the work must be directed perpendicular to the motion of the object D) it is necessary that friction not be present. 12) A mass M is attached to an ideal massless spring. When this system is set in motion, it has a 12) period T. What is the period if the mass is doubled to 2M? A) T B) 4T C) 27 D) T/72 13) Swimmers at a water park have a choice of two frictionless water slides as shown in the figure. 13) Although both slides drop over the same height,h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out How does the speed v, of a swimmer reaching the end of slide 1 compares with v2, the speed of a swimmer reaching the end of slide 2? Side 1 B) 012 C) v1> D2 D) No simple relationship exists between r1 and 2 because we do not know the curvature of slide 2. 10) The pendulums shown below have the same length string. Which pendulum will have the greates 14) kinetic energy at the bottom of its swing? k=60cm h 45 cm k30 cm h 30 em m-1kg m-3kg m-4kg A) A B) B C)C D) D

Answer 1

1o) 2294.2すan144 ert &12 we know that time feAiod nqes