The orbit of a planet around the sun is a(n)

a. ellipse
b. straight line
c. circle
d. parabola

which of the following explain why the planets remain in motion around the sun?
a. density
b. gravity
c. inertia
d. both gravity and inertia

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

Which of the following will cause an induced current in a coil of wire? the constant field of the earth passing through the coil a magnet resting near the coil a magnet being moved into or out of the coil a wire carrying a constant current near the coil

What is the difference between mass density and weight density?