Which statement about how light travels is true? a light waves need a medium to travel, and they travel at the same speed even if the light source is moving. b light waves can travel in a vacuum and travel at a constant speed even if the light source is moving. c light waves can travel in a vacuum and will travel faster if the light source is moving forward. d light waves need a medium to travel, and they travel faster if the light source is moving forward.

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