Which f the following are true for gravity

The red sphere represents a proton. What is the atomic number of this atom

Write at least name of five devices which work under the principles of Physics.

A small metal block with mass of 140 g sits on a horizontally rotating turntable. The turntable makes exactly 2 revolutions each second. The disk is located 6 cm from the axis of ration of the turntable. Answer each of the following question: a.

The gas sample has now returned to its original state of 1.00 atm, 20.0 ∘c, and 1.00 l. what will the pressure become if the temperature of the gas is raised to 200.0 ∘c and the piston is not allowed to move?

The distance between flaws on a long cable is exponentially distributed with mean 12 m. a.) Find the probability that the distance between two flaws is 15 m. b.) Find the probability that the distance between two flaws is between 8 and 20 m. c.

Five-gram samples of copper and aluminum are at room temperature. Both receive equal amounts of energy due to heat flow. The specific heat capacity of copper is 0.09 cal/g°C, and the specific heat capacity of aluminum is 0.22 cal/g°C.

A bullet travels at 870 m/s. How long will it take a bullets to go 1 m?

A 2.50 * 105 W motor is used for 26.4 s to pull a boat straight toward shore. How far does the boat move toward shore if a force of 4.20 * 104 N is applied by the motor?

Which type of wave experiences a change in speed when entering a new medium? a) only sound waves b) both sound and light waves c) only light waves d) neither sound or light waves

Three basic classes of collisions include all but which of the following?