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a) Why does water in a metal canteen stay cooler if the cloth jacket surrounding the canteen is kept moist?
b) Does an ordinary electric fan cool the air? why or why not?.if not why utilize it?
c) When a hot-air furnace is used to heat a house, why is it significant that there be a vent for air to return to the furnace? What happens if this vent is blocked by a bookcase?
d) Micros processor chip have a "heat sink" glued on top that looks like a series of fins, why is it shaped like that?
A space station is constructed in the shape of a wheel 16 rm m in diameter, with essentially all of its 6.0×10^5 rm kg mass at the rim.
A suction cup works by virtue of a vacuum that is created within the cup. When the cup is pressed against a flat surface, most of the air is forced out, what is the pressure inside the suction cup
A circular platform of radius Rp = 5.95 m and mass Mp = 359 kg rotates on frictionless air bearings about its vertical axis at 6.99 rpm. What is the angular velocity when the man reaches the edge of the platform
A 50 g Super Ball travelling at 28 m/s bounces off a brick wall and rebounds at 18 m/s. A high-speed camera records this event. If the ball is in contact with wall for 5 ms, what is the magnitude of the average acceleration of the ball throughout ..
An electric power plant that would make use of the temperature gradient in the ocean has been proposed. What is the maximum efficiency of such a system
A pond with a flat bottom has a surface area of714m2 and a depth of 2.8m. On a warm day, the surface water is at temperature of 25°C, while the bottom of the pond is at 12°C.
Suppose the ball is thrown from the same height as in the above problem at an angle of 36.0°below the horizontal. find the speed and angle of the velocity vector with respect to the horizontal at impact
A circular loop in the plane of the paper lies in a 0.55T magnetic field pointing into the paper. If the loop's diameter changes from 20 cm to 5 cm what is the magnitude of the average induced emf.
A car of mass M= 900-kg travelling at 45.0 kmh enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between road and car's tires.
A 9.0 V battery is connected across two large parallel plates that are separated by 4.5 mm of air, creating a potential difference of 9.0 V between the plates. What is the electric field in the region between the plates
A set of 57 playing cards of length L = 15 cm are stacked on theedge of a table so that the length of the overhang of the top cardwith respect to the table is maximized. A stack of only 6 suchcards is illustrated. What is the overhang distance of t..
A particular inductor has appreciable resistance. When the inductoris connected to a 11.5 V battery, the current in the inductor is4.54 A. When it is connected to AC source with an rms output of11.5 V and a frequency of 69 Hz, the current drops to..
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