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Question: A 12-V battery causes a current of 0.80A through a resistor.
A) What is its resistance?
B) How many joules of energy does the battery lose in a minute?
You buy a 75-W lightbulb in Europe, where electricity is delivered to homes at 240 V.
If you use the lightbulb in the United States at 120 V (assume its resistance does not change), how bright will it be relative to 75-W 120-V bulbs? [Hint: Assume roughly that brightness is proportional to power consumed.]
a line of positive charge is formed into a semi circle of radius r 60.0 cm. the charge per unit length along the
A graph represents the displacement of a box (m = 0.75 kg) attached to a spring. The period is 0.92 seconds and the angular frequency is 6.8 radians/second. If the maximum speed of the box is 5.25 m/s, what is the displacement of the box when a ti..
A 40 kg box is sliding down a ramp angled at 15 down from the horizontal. The box is accelerating at 1.5 m/s^2 down the ramp. Ignoring air resistance, what is the force of friction between the box and the ramp?
a u.s $20 gold piece has a mass of 33.44g and displaces 1.935cm^3 of water. if the coin is known to consist of only gold, what is the percentage of gold composition by mass of the coin
A large fake cookie sliding on a horizontal surface is attached toone end of a horizontal spring with springconstant k =440 N/m; How far will the cookie slide from the equilibrium position beforecoming momentarily to rest
From what height will you have to drop the rock on Earth so that the fall-time on both planets is the same.
A concave mirror has a focal length of 7 centimeter. Find the magnification of an object located 146 centimeter in front of this mirror
A copper wire has a resistance of 10.0 ?. At what point along its length must the wire be cut so that the resistance of one piece is 4.0 times the resistance of the other? What is the resistance of each piece?
An astronaut on the surface of the Moon fires a cannon to launch an experiment package, which leaves the barrel moving horizontally. What time interval does this trip around the Moon require
A 2.11-cm2 wafer of pure silicon is irradiated with electromagnetic radiation having a wavelength of 775 nm. How many electron-hole pairs are produced in one second
A 70 Watt light bulb operates on a potential difference of 75 Volt. Find what is the current in the bulb
The Kelvin temperature of its hot reservoir is quadrupled, and the Kelvin temperature of its cold reservoir is doubled. What is the efficiency that results?
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