Asimple pendulum is mounted in an elevator. what happens to the period of the pendulum (does it increase, decrease, or remain the same) if the elevator

(a) accelerates upward at 5.0 m/s2;
(b) moves upward at a steady 5.0 m/s ;
(c) accelerates downward at 5.0 m/s2;
(d) accelerates downward at 9.8 m/s2

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

How much energy will be transferred to your eardrum while listening to this sound for 1.0 min?

The electric field inside a battery generates an electric potential difference of 12v. the plates are seperated by a distance of 0.25m. what strength of the electric field?