Aforce is given by fx = ax-5, where a = 7.9 n · m5. (a) for positive values of x, does the potential energy associated with this force increase or decrease with increasing x? (you can determine the answer to this question by imagining what happens to a particle that is placed at rest at some point x and is then released.)

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Which sound characteristic is not affected by the relative motion of an object