PHYSICS
COLLEGE

Answer: Oranges are colored orange, Ullysses Grant is buried in Grant's tomb, and the terminal voltage of a 4-v battery is 4 volts.

COLLEGE

_____ is when a sound wave bounces off a surface back into the medium from which it came.

Reflection is when a sound wave bounces off a surface back into the medium from which it came.

by definition reflection is the process of change in direction of the wave from a surface at the same angle as it hit the surface. after reflection the wave goes back into the same medium as it came from. also the angle of the wave with surface before and after striking the surface remain same.

Correct answer is, Reflection

COLLEGE

The bar ab has a velocity at point a of va = [20,9] m/s and an angular velocity w = 23 rad/s. If the distance between a and b is .71 m what is the speed of point b

speed of point A is given as

here r = distance from the axis

so here we have

now the distance of point A and B is 0.71 m

while the distance of axis from point A is 0.91 m

so distance of axis from point B will be given as

now for the speed of point b is given as

so end point B will move with speed 37.26 m/s

HIGH SCHOOL

Matter moves up & down when the energy moves from left to right. T OR F

The answer for this problem is False

COLLEGE

Diamond has an index of refraction of 2.419. What is the critical angle for internal reflection inside a diamond that is in air? A) 155° B) 105° C) 48.8° D) 24.4° E) 131°

Answer:

C) 24.4°

Explanation:

let nd = 2.419 be the index of refraction of diamond and na = 1.0 be the index of refraction of air and ∅c be the critical angle.

according to Snell's Law:

sin(∅c) = na/nd

sin(∅c) = (1.0)/(2.419)

∅c = 24.4°