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High-intensity desk lamps are rated at 30 W but require only 13 V. They contain a transformer that converts 125 V household voltage. What is the current in the secondary when the lamp is on?
An electron in the hydrogen atom is in an excited state given by (n=4, l=3, ml=2, ms=1/2). List the possible final states the system could be in after the emission of photon. Include in the list the energies of the photon.
The current in a simple series circuit is 5.40 A. When an additional resistance of 8.60 ohms is inserted, What was the resistance (in ohms) of the original circuit
A transverse mechanical wave is traveling along a string lying along the x-axis. The displacement of the string as a function of position and time, y(x,t), is described by the following equation: y(x,t) = 0.0490sin(3.60x-182t) where x and y are in..
A racetrack is to have a banked curve with radius 225 m. What should be the angle of the bank if the normal force alone is to allow safe travel around the curve at 56.0 m/s
question1a man of mass 700kg stands in a lift on a set of weighing scales. the scale is calibrated in newtons. assume a
A sample of radioactive isotopes contains two different nuclides, labeled A and B. Initially, the sample composition is 1:1, i.e., the same number of nuclei A as nuclei B. The half-life of A is 5 hours and, that of B, 10 hours. What is the expected r..
A 6.00 V storage battery is connected to three resistors, 7.00 ?, 15.0 ?, and 20.0 ?, respec- tively. The resistors are joined in series. What is the current in the circuit
A 5.4 ball hangs from a steel wire 1.80 in diameter and 6.00 long. What would be the speed of the wave in the steal wire
A disk of mass M and radius R rolls back and forth on avertical track of radius a. Write the Langrangian for the system
a violin string which is 30.4 cm long is tuned so that its pitch is concert a which is 440 hz. i can effectively
The crates of weight 1490N will move with speed 2.2m/s at the top of a ramp that slopes downward at an angle 21.0^\circ. The ramp will exert a 533N force of kinetic friction on each crate, and the maximum force of static friction also has this val..
A child, hunting for his favorite wooden horse, is running on the ground around the edge of a stationary merry-go-round. What is the shortest time it takes for the child to catch up with the horse
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