When earth and the moon are separated by a
distance of 3.84 × 10^8 meters, the magnitude of
the gravitational force of attraction between
them is 2.0 × 10^20 newtons. what would be the
magnitude of this gravitational force of attraction
if earth and the moon were separated by a
distance of 1.92 × 10^8 meters?
(1) 5.0 × 10^19 n (3) 4.0 × 10^20 n
(2) 2.0 × 10^20 n (4) 8.0 × 10^20 n

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.