Does a rolling ball on a level floor have PE or KE? Explain.

A change that occurs when a solid melts or a liquid freezes is an example of a phase change. a. True b. False

If a hurricane is a low pressure system then why is it calm in the eye

If the tire reaches a temperature of 48 ∘c, what fraction of the original air must be removed if the original pressure of 250 kpa is to be maintained?

A 30 nc charge experiences a 0.047 n electric force. what is the magnitude of electric field at the position of this charge?

11 Initially, a single resistor R 1 is wired to a battery. Then resistorR 2 is added in parallel. Are (a) the potential difference across R 1and (b) the current i 1 through R 1 now more than, less than, or thesame as previously?

A machine has an efficiency of 80%. How much work must be done on the machine so to make it do 50,000 J of output work?

What is the name of the area surrounding earth that is influenced by earth's magnetic field?

A 15 g turntable is covered with a uniform layer of dry ice that has a mass of 9.0 g. The angular speed of the turntable and dry ice is initially 0.75 rad/s. What is the angular speed of the turntable once all the dry ice has evaporated?

Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH level) was measured. The mean and standard deviation of the values are 4.60 and 1.10 respectively.

A hot air balloon is rising straight up at a constant speed of 7 m/s. when the balloon is 12.0 m/s above the ground, a gun fires a pellet straight up from ground level with an initial speed of 30.0 m/s.