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An 80-cm-long wire is made by welding a 1.2 mm-diameter, 20-cm-long copper wire to a1.2 mm-diameter, 60-cm-long iron wire. What is theresistance of the composite wire?
A 0.9 inch tall clock is 24 cm in front of a diverging lens which has a focal length of -33.5 cm. Paying attention to sign, answer the following questions. a. What is the image distance? cm b. What is the image's height?
you swing a 1.65-kg rock tied to a rope in a vertical circle of radius 0.75 m. when the rock reaches the top its speed
The driver of a 1550 kg car, initially traveling at 12.1 m/s, applies the brakes, bringing the car to rest in a distance of 19.5 m. Find the net work done on the car
A shop sign weighing 245-N is supported by a uniform 155-N bean. Find out the tension in the guy wire, and the horizontal and vertical forces exerted by the hinge on the bean.
The wall of a house consists of three layers: a wooden outer wall with an R factor of 1.0, a 3in layer of fiberglass insulation with an R factor of 11, what is the rate of heat loss throug an 8ft by 15ft section of this wall
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. What is the frequency o the sound emitted by the horn
What is the average electric field strength in this region?
a 25kg mass hangs by a rope. If the tension in the rope is a constant 200N and the initial velocity of the mass is 3m/s upwards, what is the velocity of the mass after 2 seconds
Two new particles, which have identical positive charge q3, are placed the same 0.0434 meters apart, and the force between them is measured to be the same as that between the original particles, What is q3
An electric dipole consisting of charges of magnitude 2.10 nC separated by 7.60 µm is in an electric field of strength1150 N/C. What is the magnitude of the electricdipole moment?
Two point charges are separated by 10.0 cm and have charges of +2.00 and -2.00 Coulombs. What is the electric field at a point midway between the two charges
A free electron and a free proton are placed in an identical electric field. which of the following statement are true?
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