Spacecraft X has twice the mass of Spacecraft Y. They orbit Earth at the same radius. Which of these must be true? A. X feels a greater gravitational force than Y B. X travels twice as fast as Y C. X takes twice as long to complete an orbit D. The orbital period of X is the same as Y

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