SMDEP Physics Gravity, Simple Harmonic Motion

Vote only on required HW problems Other problems will be worked out in TA sessions

Ch 14, #3: frequency? Hz Hz Hz Hz 5.Other 6.Didn’t finish

Ch 14, #40: period on Mars? s s s 4.32 s 5.Other 6.Didn’t finish

Suppose the Earth had no atmosphere and a ball were fired from the top of Mount Everest tangent to the ground. If the initial speed was large enough to cause the ball to move in a circular trajectory around the Earth, the ball’s acceleration would: 1.Be much less than g (because the ball doesn’t fall to the ground) 2.Be approximately g 3.Depend on the ball’s initial speed

The Moon does not fall to Earth because: 1.The net force on it is zero 2.It is beyond the main pull of Earth’s gravity 3.It is being pulled by the Sun and other planets as well as Earth 4.All of the above 5.None of the above

An object moves along the x-axis subject to a force described by the potential energy shown below. About what point can the object execute an oscillation? 1.A 2.B 3.C 4.All of the above 5.None of the above A B C x U(x)

A block hangs from a spring. The block is held at a position where the spring is unstretched and then released. What happens? 1.It remains at rest at the new equilibrium position. 2.It oscillates about the unstretched string position. 3.It oscillates about a position that is lower than its initial position. 4.It moves but not in simple harmonic motion because the net force is not proportional to the displacement.