Which of the following is a limitation of models? A.
Sometimes models provide data when data cannot be acquired from natural objects or events.
B.
Models usually do not have exactly the same features as the objects or events that they represent.
C.
Models are often safer to study than the objects or events that they represent.
D.
It is often easier to study models rather than the objects or events that they represent.

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?