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When combing your hair, you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb?
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 25 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 155 m), the block swings ..
A 3.0-cm -tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 18cm . How many places can you put the lens to form a well-focused image of the candle flame on the wall?
A policeman uses a radar gun to detect the speed of drivers in a 65 mph (29.06 m/s) zone, What is the driver's speed, Is the driver breaking the speed limit
The cutoff wavelength for a metal is found to be 300. nm. Calculate the maximum velocity of the emitted electrons
Three point charges have equal magnitudes, two being positive andone negative. These charges are fixed to the corners of anequilateral triangle, as the drawing shows. The magnitude of eachof the charges is 6.0 μC, and the lengths of the sides of t..
A concave makeup mirror is designed so that a person 28 cm in front of it sees an upright image magnified by a factor of two. What is the radius of curvature of themirror?
Light in a vacuum is incident on a transparent glass slab. Theangle of incidence is 32.0° . The slab is then immersed in a pool of liquid. What is the index of refraction of the liquid
A mass C of 10 kg is attached to a rod that is rotating around a vertical shaft as shown in the figure. If the mass is subject to the force shown in the figure and the shaft is subject to a moment M=( 8t 2 + 5 ) N. m as shown determine the velocit..
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. Determine the length of the lake
Obtain the wavelength in vacuum for blue light, whose frequency is 6.58 1014 Hz
A mass of 50 kg hangs from a cable that, in turn, is tied to two other cables, What are the tensions in the two upper cables, TL and TR
The rails are laid on a winter day when their temperature is 1.8°C. (a) How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 32.2°C
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