2) CDs and DVDs turn with a variable w that keeps the tangential speed v. constant. Find the angular speed w that a CD must have in order to give it a linear speed v. = 1.25 m/s when the laser beam shines
on the disk
(a) at 2.50 cm from its center, and
(b) at 6.00 cm from its center.

In what direction does an applied force move an object

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .