* Required
3
A student put room-temperature water into a bottle. She pushed a
stopper and tube into the bottle until the water came halfway up the tube.
The student turned the bottle system sideways and put a cold wrap
around the bottle for 2minutes. She then put a hot wrap around the bottle.
The water levels are shown in the illustration below. What caused the
water level in the tube to change? *

Water at room temperature of 20.0°c is poured into an aluminum cylinder which has graduation markings etched on the inside. the reading in the graduations is 300.0 cc. the cylinder with the water in it is then immersed in a constant temperature bath at a temperature of 100°c. what is the reading for the level of water on the graduations of the cylinder after the water and the cylinder reach thermal equilibrium with the bath? the volume coefficient of expansion of water is 2.07 x 10^-4 k-1, and the linear coefficient of expansion of aluminum is 23.0 x 10^-6 k-1. a) 305.0 cc b) 304.0 cc c) 303.5 cc d) 303.3 cc e) 304.5 cc

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's