A pulley is used to lift a heavy mass from the floor to the platform. The IMA of the system is 5 and the AMA is 2.5. What is the efficiency of the system?

Who was the first person to discover wormholes?

How is thermal energy related to heat

If two automobiles collide, they usually do not stick together. Does this mean the collision is elastic? Explain why a head-oncollision is likely to be more dangerous than other types ofcollisions.

Which of the following is not true? A) Absolute zero on the Kelvin scale is - 273°C. B) Liquefaction of the gas occurs at approximately - 155°C. C) The gas pressure increases as the temperature decreases.

Your friend is constructing a balancing display for an art project. She has one rock on the left (ms=2.25 kgms=2.25 kg) and three on the right (total mass mp=10.1 kgmp=10.1 kg).

Which statement about an electron in the 4d state is correct? A. The magnitude of its orbital angular momentum is 6√ℏ. B. The largest orbital angular momentum it could have in any given direction is 4ℏ. C.

A D note has a frequency of 587.33 Hz. Calculate its wavelength in meters. The speed of sound is 343 m/s

A cyclist allows his bike to roll down a hill without pedaling. Towards the bottom of the hill he applies his brakes. The bike comes to a stop. Applying the brakes causes the brakes to warm up. Describe the energy transfers that have occurred.

An object is placed in a fluid and then released. Assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom.

Explain why it is important to have strong core muscles?