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80-m aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Now before the bar hits the river below, its speed is 22 m/s, and the emf induced across its length is 6.5 X 10^-4 V. Assuming the horizontal component of the earth's magnetic field at the location of the bar points directly north, a) Decide the magnitude of the horizontal component of the earth's magnetic field, and b) state whether the east end or the west end of the bar is positive.
A 5.70 kg object on a horizontal frictionless surface is attached to a spring with spring constant 940 N/m. What is the frequency of the motion
When a potential difference of 12V is applied to a wire 6.6m long and 0.35mm in diameter the result is an electric current of 2.1A
A container holds 2.3 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 7.2x10-3 kg bullet with a speed of 960 m/s. What is the Kelvin temperature of the gas
A very long, thin straight line of charge has a constant charge density of 20pC/cm. How far does the electron go before it comes back
A block with mass m1 = 8.8 kg is on an incline with an angle ? = 39.0° with respect to the horizontal. What is the minimum spring constant of the spring to keep the block from sliding
Determine the number of revolutions through which a typical automobile tire turns in 1 yr. Suppose the automobile travels 13000 miles each year on tires with radius 0.260 m
q1. a piece of wood is 6.00 m long 0.260 m wide and 0.060 m thick. its density is 600kgm cubed. what volume of iron p
King Arthur's knights use a catapult to launch a rock from their vantage point on top of the castle wall, 15 above the moat. The rock is launched at a speed of 21 and an angle of 30 above the horizontal. How far from the castle wall does the launched..
An automobile with a mass of 2250 slugs is driven around a circular curve, What is the centripetal force on the car
To maximize the moment of inertia of a flywheel while minimizing its weight, what shape and distribution of mass should it have
Consider the equation for heat transfer through a wall. Based on this, describe two simple ways you could modify your home to decrease the rate at which heat is lost through your walls.
A sailboat is heading directly north at a speed of 18 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.4 knots. what is the magnitude of the knots
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