24. A decoration, of mass M, is suspended by a string from the ceiling inside an elevator. The elevator is traveling UPWARD with a constant speed. The tension in the string is a. less than Mg. b. greater than Mg. c. equal to Mg. d. impossible to tell without knowing the speed. e. impossible to tell without knowing the decoration mass. 25. In the absence of an external force, a moving object will a. move with constant velocity in a circular orbit. b. stop immediately. c. move with constant velocity in a straight line. d. gradually speed up until it reaches its terminal velocity. e. slow down and eventually come to a stop. 26. Two cardboard boxes full of books are in contact with each other on a table, as shown. Box H has twice the mass of box G. If you push on box G with a horizontal force F, then box H will experience a net force of a. 3/2 F. b. 2/3 F. c. 3 F. d. F. e. 2 F.
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**24. Tension in the String:** The decoration is suspended in an elevator moving upward with a constant speed. When an object moves with constant speed, it means there is no net acceleration acting on it. Show more…
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1. A row of blocks is lined up with masses of 1.49 kg, 2.45 kg, and 3.93 kg. The masses are then pushed forward by a 12.7 N force applied to the 1.49 kg block. If the table is frictionless, how much force does the 2.45 kg block exert on the 3.93 kg block? a) 1.52 N b) 2.44 N c) 6.34 N d) 3.95 N 2. A group of construction workers is building a house and wants to lower down an excess bundle of 1010 kg bricks to the ground. They tie one end of a rope to the bundle of bricks, loop it through a pulley, and tie the other end of the rope to a toolbox. If the coefficient of kinetic friction between the toolbox and the floor is 0.510 and the acceleration of the bundle of bricks is 5.79 m/s^2, what is the mass of the toolbox? a) 768 kg b) 1.17Ă—10^3 kg c) 5.11Ă—10^3 kg d) 375 kg 3. In the figure provided, a 130 kg crate, to the right of the pulley, is released from rest and begins to fall to the ground. If the mass on the left is m = 75.0 kg, what is the magnitude of the acceleration of the 130 kg crate? Assume the rope and pulley are massless. a) 7.19 m/s^2 b) 2.63 m/s^2 c) 9.80 m/s^2 d) 4.15 m/s^2
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