Mass = 386g volume = 20cm3 what is the density=

If the frequency of a sound wave is 250 hertz and it's wavelength is 1.36 m, what is the waves velocity? A) 250 m/s B) 340 m/s C) 200 m/s D) 120 m/s

Which statements does the Second Law of Thermodynamics support? 1. The usable energy in the universe is decreasing. 2. The usable energy in the universe is increasing. 3. The energy of the universe is being destroyed. 4.

If an object is traveling along at a constant velocity and there is friction acting on the object, what can be concluded about the forces acting on this object?

A (n) is produced around a wire when an electrical current is in the wire.

A 0.280-kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (A) What is the mass of the second ball?

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which has more gravitational potential energy - - a cliff diver at the top of the cliff or a cliff diver at the bottom of the cliff?