In which natural cycle must an important gas in earth's atmosphere be fixed before plants can use it?
a. sulfur cycle
b. carbon cycle
c. nitrogen cycle
d. oxygen cycle

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

To a of 4 x hz is 1. 0. mm nm nm