Stars other than our sun normally appear featureless when viewed through telescopes. Yet astronomers can readily use the light from these stars to determine that they are rotating and even measure the speed of their surface. How do you think they can do this?
I used the "Inside a solid sphere of constant density the gravitational force varies linearly with distance from the center, becoming zero at the center of mass."
from the reference to make my previous suggestion and yes I did get intimidated when I scrolled down from there. Can someone...
What happens to the "lost" energy in these situations?
(a) A box sliding across the floor stops due to friction. How did friction take away that KE and what happened to that energy?
(b) A car stops when you apply the brakes. What happened to its kinetic energy?
(c) air resistance uses up...
A 1 Kg object is dropped from rest from a helicopter at an altitude
of 2000 meters. What is the velocity of the object just before it lands upon a thick bed of pillows? The top of the pillow stack is at zero altitude. If the restoring force
constant (spring constant) of the stack of pillows is...
You dig a hole half way to the center of the earth. You lower an object to the bottom
of the hole. By what fraction has the force of the Earth’s gravity on the object been reduced
relative to that at the surface? Assume that the earth is a sphere and has uniform density