A ball was positioned in the middle of a smooth ramp and allowed to roll downward. How does the total mechanical energy of the system change as
the ball rolls down the ramp? Assume that there is no friction.

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

The mini-refrigerator fire was most likely caused by what type of wiring?

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.