Big al stands on a skateboard at rest and throws a 0.5 kilogram rock at a velocity of 10.0 m/sec. big al moves at 0.05 m/sec. what is the combined mass of big al and the skateboard?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.