The two ropes seen in (Figure 1) are used to lower a 255 kg piano exactly 6 m from a second-story window to the ground.

A 6 kg ball moving west at 4 m/s collides with a 4 kg ball moving east at 3 m/s. What is the velocity (magnitude and direction) of the 4 kg ball after the collision if after the collision the 6 kg ball comes to a stop?

Select the correct answer, Based on the law of conservation of energy, which statement is false?

Which statement explains why the moon's gravity is able to create high and low tides

What is the wavelength of a radio photon from an "am" radio station that broadcasts at 1080 kilohertz?

A uniform thin circular rubber band of mass M and spring constant k has an original radius R?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume