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A wire with a circular cross section and a resistance R is lengthened to 8.86 times its original length by pulling it through a small hole. After being pulled through the hole, the total volume of the wire is unchanged. Find the resistance of the wire after it is stretched.
A roller coaster, loaded with passengers, has a mass of 2,000 kg; the radius of curvature of the track at the TOP point before the dip is 24 m. what force is exerted on the vehicle by the track
A 0.55 kg air cart is attached to a spring and allowed to oscillate. You are given the displacement of the air cart from equilibrium to be x = (19.7 cm) cos[(2.64 s-1)t + ?]. Find the maximum kinetic energy of the cart
A parallel beam of light containing red (660 nm) and blue (470 nm) wavelengths goes from polystyrene to water, What is the angle between the two colors in water
Unpolarized light of intensity I0 passes through six successive Polaroid sheets each of whose axis makes a 45? angle with the previous one
A pogo and rider of 80kg total mass at the high point of a 2.0m jump will drop 1.3m before the pogo plunger touches the ground, What approximate average force does the pogo stick exert on the ground during the landing
A carbon dioxide laser emits a sinusoidal electromagnetic wave that travels in vacuum in the negative x-direction, Write vector equations for E and B as functions of time and position
the speed of light in a vacuum is 3108 ms . the speed of light whitin a particular substance is 1.5 108 ms. the index
a 225 turn rectangular coil having dimensions of 3.4 cm by 4.8 cm is placed in a uniform magnetic field of magnitude
a pendulum clock can be approximated as a simple pendulum of length 1.47 m and keeps accurate time at a location where
The steel I-beam in the drawing has a weight of 3.51 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends
What is the magnitude of the force on the bead. find the charge of the particle.
A 52.1-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.589 and 0.312, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across ..
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