Which of the following are non-contact forces: friction, electrostatic force, magnetic force, gravity?

Your family is moving to a new house. While lifting the box 1.5 m straight up you exerted a force of 200 N for 1 second. How much work is required?

When changing state, the temperature of a substance remains constant even though energy is supplied. What happens to the energy supplied?

Calculate the force exerted on a rocket when the propelling gases are being expelled at a rate of 1400 kg/s with a speed of 3.6*104 m/s.

A deuterium nucleus consists of one proton and one neutron. The quark composition of a deuterium nucleus is (1) 2 up quarks and 2 down quarks (2) 2 up quarks and 4 down quarks (3) 3 up quarks and 3 down quarks (4) 4 up quarks and 2 down quarks

Sue and Jenny kick a soccer ball at exactly the same time. Sue's foot exerts a force of 52.6 N to the north. Jenny's foot exerts a force of 112.8 N to the east. a) What is the magnitude of the resultant force on the ball? Answer in units of N.

A change from one form of energy into another is called a. gravitational potential energy. b. work. c. conservation of energy. d. an energy transformation

4. An airplane must achieve a velocity of 71 m/s for takeoff. If the runway is 1000 m long, what must the acceleration be?

As the average kinetic energy of the particles in a gas increases, which of the following occurs?

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?