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A class of ten students taking an exam has a power output per student of 130 Watt. Assume that the initial temperature of the room is 20.0oC and that its dimensions are 6.20 meter by 14.4 m by 3.20 m. Evaluate the temperature of the room at the end of 62.0 min if all the heat remains in the air in the room and none is added by an outside source? The specific heat of air is 834 J/kg*oC, and its density is about 1.27E-3 g/cm3.
according to the IOC, an Olympic diving pool must be at least 5m deep. What is the pressure at the bottom of a 5m deep pool
A 55-kg man holds a weight of 20 kg on his head. what is the work done by him against gravity if he moves a distance of 20 m (1) on a horizontal road, (2) on an incline of 1 in 5 ? take g = 10 m/s.s
a point charge of -7.0 u c is at the origin.part a what is the electric potential at 3.0 m 0? express your answer
light rays in a material with index of refrection 1.31 can undergo total internal reflection when they strike the
a very thin sheet of brass contains two thin parallel slits. when a laser beam shines on these slits at normal
the two hot air balloons in the drawing are 48.2 and 57.0 m above the ground. a person in the left balloon observes
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.0 s, it rotates 45 rad. What is the instantaneous angular velocity of the disk at the end of the 5.0 s
A rock is thrown vertically upward with a speed of 14.0 . Exactly 1.00 later, a ball is thrown up vertically along the same path with a speed of 21.0
A pipe that is closed on one end is 1.2 meters long. What are its fundamental frequency and its first two overtones
A 500 g solid disk roles down an inclined plane 1 m long elevated by 10 cm. What is the kinetic energy of the disk at the bottom of the plane
Unpolarized light passes through two polarizers in turn with polarization axes at 41° to one another. What is the fraction of the incident light
An 52.0 N box of clothes is pulled 6.7 m up a 30.0° ramp by a force of 107 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, compute the change in the box's kinetic energy.
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