In beta decay the mass number (the total number of protons and neutrons) of the parent nuclide decreases by
A. 0
B. 2
C. 4
D. 6
A. 0
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A waxing crescent moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. near the western horizon just before sunrise. d. near the western horizon just after sunset. e. from sunset until sunrise.
A car has a mass of 2,000 kg and travels at 20.0 m/s. If the drag force is 100 N, the power the engines have to provide to keep moving at constant speed is
A. 2.0 kW. B. 2.9 kW. C. 3.4 kW. D. 3.9 kW. E. 4.2 kW.
A box sits on a countertop, stationary. A boy pushes horizontally to the right on the box, and a girl pushes on it to the left, yet it remains stationary. Which of the following statements is false?
A. We know the force of the boy on the box is equal in magnitude to that of the girl on the box because the box is in equilibrium. B. We know the force of the boy on the box is equal in magnitude to that of the box on the boy because of Newton’s third law. C. We know the weight and normal force are equal in magnitude because the box is in equilibrium. D. We know the weight and normal force are equal in magnitude because of Newton’s third law.
A straight wire is bent into the shape shown. Determine the net magnetic force on the wire when the current I travels in the direction shown in the magnetic field 
.
A. 2IBL in the ?z direction B. 2IBL in the +z direction C. 4IBL in the +z direction D. 4IBL in the ?z direction E. zero