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"Gravitational Force"
Each week, you will reply to two discussion forum questions. You may submit your answers together or separately - just be sure you address both questions. Here are your questions for this week:
Part 1:
As you listen to a vinyl record, how does the speed on the needle on the record change as the album progress (the needle move from the outside in)? How are compensations made (if any) for this?
Part 2:
Go back and review freefall motion from your earlier study of kinematics. How is it easier (in most cases) to solve similar problems in freefall with energy here? What are two other examples where using energy might make solutions easier?
A dolphin in 25 degrees C sea water emits a sound directed toward the bottom of the ocean 213 m below. How much time passes before it hears an echo? The speed of sound in sea water is 1530 m/s.
A solid ball of mass M and radius R starts from rest and rollswithout slipping down a hill; Find the ball's speed at the bottom of the hill
Two metal spheres, each of radius 2.5 cm, have a center-to-centerseparation of 2.6 m. Sphere 1 has a charge of +1.4 x10-8 C; sphere 2 has a charge of -2.7 x 10-8C. Assume that the separation is large enough for us to assume that the charge on each sp..
the image of the moon is formed by a concave mirror whose radius of curvature is 4.52 meters at a time when the moons
A heavy steel ball is hung from a cord to make a pendulum. The ball is pulled to the side so that the cord makes a 5 degree angle with the vertical. what force is required to hold the ball
a simple gaussmeter for measuring horizontal magnetic fields consists of a stiff 58 cm wire that hangs from a
1. if the electric field exceeds about 3106 nc in air a spark occurs. approximately what is the absolute value of the
A large fish hangs from a spring balance supported from the roof of an elevator. What will the balance read if the elevator cable breaks
a pitcher delivers a fast ball with a velocity of 43 m/s to the south. the batter hits the ball and gives it a velocity of 51 m/s to the north. what was the average acceleration of the ball
A 64.0-kg person holding two 0.750-kg bricks stands on a 2.20-kg skateboard. Initially, the skateboard and the person are at rest. What is the recoil speed of the person
Determine how much electric potential does an electron have when placed 5.3 x 10-11 meter from a proton? Express your answer in both Joules and in "eV"
Nonreflective coatings on camera lenses reduce the loss of light at the surfaces of multilens systems and prevent internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride
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