When you are beneath the surface of water and looking upward, light from above is seen
A) within a cone of 96°.
B) at angles beyond a cone of 96°.
C) at any angle if the surface is smooth.
Answer: A
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Collisions in which kinetic energy is conserved are said to be inelastic collisions
Indicate whether the statement is true or false
What do infrared and ultraviolet waves have in common? How do they differ?
What will be an ideal response?
In which case does an electric field do positive work on a charged particle?
a. A negative charge moves opposite to the direction of the electric field. b. A positive charge is moved to a point of higher potential energy. c. A positive charge completes one circular path around a stationary positive charge. d. A positive charge completes one elliptical path around a stationary positive charge.
You push horizontally on a 120-N box that is initially resting on a horizontal table. The coefficient of static friction between the box and the table is 0.75, and the coefficient of kinetic friction is 0.40
Find the friction force on the box if the push is equal to (a) 84 N; (b) 94 N.