As a 5.0 × 10^2-newton basketball player jumps
from the floor up toward the basket, the
magnitude of the force of her feet on the floor is
1.0 × 10^3 newtons. as she jumps, the magnitude
of the force of the floor on her feet is
(1) 5.0 × 10^2 n (3) 1.5 × 10^3 n
(2) 1.0 × 10^3 n (4) 5.0 × 10^5 n

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Find v1, the speed of the fluid in the left end of the main pipe. express your answer in terms of h1, h2, g, and either a1 and a2 or γ, which is equal to a1a2.

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?