You push a 400 kg car for 6 m with a force of 300 N? What is the car’s final speed if all your work became kinetic energy? Group of answer choices

3 m/s

5.8 m/s

80 m/s

0.40 m/s

When an object is heated it contracts. a. true b. false

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.

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?