The table and graph below show the distances traveled by two different objects. A table has title Object A and has 2 columns and 5 rows. The column heading is Time in hours and distance in miles. The first column has numbers 1, 2, 3, 4 and the second column has numbers 12, 26, 40, 48. A distance versus time graph is titled Object B and it is a straight line passing through the points 0, 0 and 5, 50 What is the difference between the motions of the two objects? a Object A's speed increases steadily but Object B's speed decreases steadily. b The speed of Object A is constant but Object B's speed increases steadily. c The speed of Object A changes but Object B travels at a constant speed. d Object A travels at a constant speed but Object B travels at an increasing speed.

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law