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The magnetic field at the center of a solenoid is equal to the earth's magnetic field at that point (5.00*10 -5 T). The solenoid is one meter long and has 140turns. Compute the current required to produce this field.
Three resistors having resistances of 1.20 ohm, 2.50 ohm , and 4.60 ohm are connected in parallel to a 25.0 V battery that has negligible internal resistance. Find the equivalent resistance of the combination.
The electric motor of a model train accelerates the train from rest to 0.720 m/s in 27.0 ms. Find the average power delivered to the train during its acceleration
A photographic slide is to the left of a lens. The lens projects animage of the slide onto a wall which is a distance of x to the right of the slide. How far is the slide from the lens
A 6.40 nF capacitor is initially charged by a potential difference of 1.40×103 V. find the final electric potential energy stored in the capacitor
The plates of a spherical capacitor have radii 36.0 mm and 44.0 mm. What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance
A 76 W light bulb with a resistance of 178 ? is connected to a power supply with a 117 V. What is the internal resistance of the power supply
A 2000 kg car is traveling at 15.0 m/s down a long mountain grade of 2.0%. The mountain road is 5.0 km long. What is the increase in the temperature of the brakes
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 21 to 59 dB. What is the ratio of the final sound intensity to the original sound intensity?
a spring has a spring constant of 47.3 nm. a mass of 300 grams is added to the end of the spring and the mass -spring
A room with dimensions 10 x 10 x 20 meters is filled with air at 20 degrees C, 101 kPa and relative humidity 0.8. What is the mass of water vapor in the room, in units of kg
A converging lens (f = 28.0 cm) is utilized to project an image of an object onto a screen. The object and screen are 124 cm apart, and among them the lens can be placed at either of two locations.
A delivery truck travels 18 blocks north, 10 blocks east, and 16blocks south. What is its final displacement from the origin
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