The brakes on a car do 220,000 J of work in stopping the car. If the car travels a distance of 39 m while the brakes are being applied, what is the force the brakes exert on the car? Round to a whole number.

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

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

What are the north and south poles of a solenoid change with?