A lapidary plate at rest is turned on to cut a gemstone. The plate rotates until it reaches a tangential speed of 12.0 m/s. What is the centripetal acceleration of a point 0.10 m from the center of the plate? 1.2 m/s2
14.4 m/s2
1440 m/s2
120 m/s2

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

Why do astronauts in the space shuttle weigh less?