Asimple pendulum and a mass oscillating on an ideal spring both have period t in an elevator at rest. if the elevator now accelerates downward uniformly at 2 m/s2, what is true about the periods of these two systems? a. the period of the pendulum would increase but the period of the spring would stay the same. b.the period of the pendulum would decrease but the period of the spring would stay the same. c. both periods would remain the same. d. both periods would decrease. e. both periods would increase.

Carbon-14 is a radioactive element that undergoes beta decay. which force is responsible for allowing carbon-14 to become stable? electromagnetic gravitational weak nuclear strong nuclear

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.