Apparatus that liquefies helium is in a room at 300 K. If the helium in the apparatus is at 5 K, what is the minimum ratio of heat energy delivered to the room to the energy removed

from the helium?​

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2