Anature photographer is using a camera that has a lens with a focal length of 3.06 cm. the photographer is taking pictures of ancient trees in a forest and wants the lens to be focused on a very old tree that is 10.4 m away. a) how far must the lens be from the film in order for the resulting picture to be clearly focused? answer in units of cm.

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