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Two lamps have different resistances, one larger than the other
a) If they are connected in parallel. which is brighter (dissipates more power)?
b) When connected in series, which is brighter?
determine the mass of liquid ammonia that boils away before thermal equilibrium. Assume an excessive amount of liquid ammonia is present and that the liquid ammonia does not react with the copper.
albert pujols is pitched a 0.145kg baseball at -39.ms and he hits the ball on a horizontal line drives straight back
Excited states do not in general live very long before they decay.Suppose a certain excited state lives just 10^-7 s. In that case weknow the time when the atom is in the excited state quiteaccurately--to within ?t=10^-7 s. That means there is a ..
Two people stand 3 m away from a large plane mirror and spaced 3.8 m apart in a dark room. At what angle of incidence should one of them shine a flashlight on mirror so that the reflected beam directly strikes the other person.
A wave on a string starts at the middle and crests at 10 centimeter, goes to the trough (the line), crests again, goes to a trough, crests again, and ends at the middle. Determine what is the waves speed
a capacitor is made by taking two sheets of aluminum foil each 0.022 mm thick and placing between them a sheet of paper
A board of mass 20 kg and length 4 m is supported by two scales, one a t the left end of the board, and the other at 3 m from that end. What is the reading on the scale at the left end
A concrete block of msss 10kg is pulled 7.0m across a frictionless surface by means of a rope and the net work done on the block is 220J. obtain the magnitude of the normal force acting on the block
A spaceship of rest length 192 m races past a timing station at a speed of 0.780c. What is the length of the spaceship as measured by the timing station
A uniform 1.5-kg rod that is 0.81 m long is suspended at rest from the ceiling by two springs, one at each end of the rod. Find the angle that the rod makes with the horizontal
Assuming no heat loss to the surrounding environment, determine the minimum duration of time necessary for a 100 W aquarium tank heater to raise the temperature of 20.0 gallons of water by a difference of 10.0°C.
A photon is emitted from a light bulb located 2 m above the floor. The photon travels in a straight line shown with the dashed arrow in the diagram below. The angle among the photon’s path and the wall is 65 degrees.
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