What statements best define percent error? Check all that apply.

It is a mathematical way of showing accuracy.
The higher the percent error, the more accurate the data set.
The higher the percent error, the less accurate the data set.
Only the experimental value is needed to calculate percent error.
Only the actual, or accepted, value is needed to calculate percent error.
A percent error always has a positive value.

Abaseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. after it is hit, the ball leaves the bat at 50.0 m/s directly back. find the impulse of the bat on the ball. 7.25 kg*m/s 13.1 kg*m/s 5.80 kg*m/s 1.45 kg*m/s

Diamond will scratch quartz. true or false

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)