Which one of the following statements is true concerning an object executing simple harmonic motion? (a) the object’s velocity is never zero. (b) the object’s acceleration is never zero. (c) the object’s velocity and acceleration are simultaneously zero. (d) the object’s velocity is zero when its acceleration is a maximum. (e) the object’s maximum acceleration is equal to its maximum velocity.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?

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?

What type of force holds atoms together in a crystal?