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Question: You are to compare the electrical requirements of three light bulbs. Use the lighting effect of a 60 w incandescent light bulb as the basis of comparison. For each of the three bulbs, incandescent, CFL, and LED
a) state the electrical power (watts) used and the luminous energy (lumens) output by each of the three bulbs,
b) calculate the current used by each (assume an operating voltage of 120 V),
c) calculate the effective resistance of each,
d) determine the cost of using each bulb for 1 hour.($0.18/kWh)
A toy rocket moving vertically upward passes by a 2.1m -high window whose sill is 8.0m above the ground. What was the launch speed of the rocket
A 56.7 cm long straight section of wire is located entirely inside a uniform magnetic field of |B| = 0.210 T. The wire is perpendicular to the direction of the magnetic field. When a current runs during the wire a magnetic force of|F| = 0.950 N acts ..
A solar cell generates a potential difference of 0.320 V when a 445.0 ? resistor is connected across it and a potential difference of 0.504 V, find the internal resistance of the cell in Ohms
A series R-L-C circuit is connected to a 150Hz ac source that has Vrms = 80.0V. What average power is delivered to the circuit by the source
The primary coil of a step-up transformer is connected across the terminals of a standard wall socket, and resistor 1 with a resistnace R1 is connected across the secondary coil. The current in the resistor is then measured.
A beam of light strikes a sheet of glass at an angle of 57.0deg. with the normal in air. You observe that red light makes an angle of 38.1 degrees with the normal in the glass, What are the speeds of red and violet light in the glass
A motorcycle accelerates uniformly from rest and reaches a linear speed of 28.6 m/s in a time of 11.9 s. Find the magnitude of the angular acceleration of each tire
A single circular loop of radius 0.23m carries a current of 2.7A in a magnetic field of 0.96T. What is the maximum torque exerted on this loop
Two large, parallel, conducting plates are 9.7 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 5.7 x 10-15 N acts on an electron placed anywhere between the two plates. (Neglect fring..
When placed in series, what real battery are they equivalent to? When placed in parallel, what real battery are they equivalent to?
A fun-loving 10.1kg otter slides up a hill and then back down to the same place. how much mechanical energy did she lose on the hill
A softball of mass 0.200 that is moving with a speed of 7.1 collides head-on and elastically with another ball initially at rest. Afterward the incoming softball bounces backward with a speed of 3.4 .Calculate the velocity of the target ball after th..
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