A50-cm-long spring is suspended from the ceiling. a 270 g mass is connected to the end and held at rest with the spring unstretched. the mass is released and falls, stretching the spring by 24 cm before coming to rest at its lowest point. it then continues to oscillate vertically. part a what is the spring constant?

Which of the following is a source of heat for magma formation? magma plumes in the continental crust friction due to divergence friction due to subduction magma plumes in the oceanic crust

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is