A piston has an area of 4 m2 and needs 20 N of force to push it down. What is the pressure?P=F/A * A) 5 Pa
B) 0.2 Pa
C) 80 Pa
D) 20 Pa

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Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

This is the number of complete movements of a wave per second.

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?