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A small compass is held horizontally, the center of its needle adistance of 0.120 m directly north of a long wire that isperpendicular to the earth's surface. When there is no current inthe wire, the compass needle points due north, which is thedirection of the horizontal component of the earth's magnetic fieldat that location. This component is parallel to the earth'ssurface. When the current in the wire is 12.0 A, the needle points15.0° east of north.(a) What direction does the current inthe wire flow, 1 - toward or 2 - away from the earth's surface? Give the number of the correct answer.(b) What is the magnitude of the horizontal component of the earth's magnetic field at the location of the compass?
In the figure, a man is standing near a gate and a flag pole. The gate is 15 ft from the pole. How far is the man from the gate
A jetliner can fly 5.32 hours on a full load of fuel. Without any wind it flies at the speed of 220 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip.
you ar charged to work on reducing expenditures for a company.you think that the company can save considerable money on fuel costs by lowering the room temperature of the building for daily use, How much heat will be saved each morning
150 ml of water at 5.00C is placed in the freezer compartment of a refrigerator with a coefficient of performance of 6.00. How much heat energy is exhausted into the room
The engine of an aircraft propeller delivers an amount of power 177 hp to the propeller at a rotational velocity of 2390rev/min, How much torque does the aircraft engine provide
A potential difference of 14 V is found to produce a current of 0.39 A in a wire of length 3.1 m with a uniform radius of 0.44 cm. What is the resistivity of the wire
A 2.00-mol sample of hydrogen gas is heated at constant pressure from 302 K to 414 K. Calculate the energy transferred to the gas by heat
A 2.0-cm-diameter spider is 1.50m from a wall. Determine the focal length of a lens that will make a half-size image of the spider on the wall
A 6.0-uF air capacitor is connected across a 100-V battery. Afterthe battery fully charges the capacitor, the capacitor is immersed in transformer oil (dielectricconstant = 4.5).
The coefficients of friction between a block of mass 0.5 kg and a surface are ?s = 0.75, What is the magnitude of the frictional force (in newtons) on the block if the block is at rest
Suppose your body was able to use the chemical energy in gasoline, How far could you pedal a bicycle? How far could you pedal a bicycle at 15km/hr on the energy in 1.8 gal of gas? (1 gal of gas has a mass of 3.2 kg)
An 20cm--long bicycle crank arm, with a pedal at one end, is attached to a 25cm--diameter sprocket, What is the tangential acceleration of the pedal
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