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Two points A and B lie 20 cm apart on a line extending radially from a point charge Q. If the potential at A is 150 V and the potential at B is 120 V, find the charge Q and the distance of point A from the charge. What is the work that needs to be done to move a 10 µC charge from B to A?
An opera singer in a convertible sings a note at 600 whereas cruising down the highway at 81. What is the frequency heard by a person standing beside the road in front of car? What is the frequency heard by the person standing beside the road behi..
A step-down transformer has 30 turns of wire on one coil and 1200 turns on the other. what is the required rms input voltage
A proton moves at 4.9x106 m/s in a magnetic field where B = 0.42 T. what force does the proton experience
You are trying to hit a cart of mass 0.3 kg on a frictionless table with a toy projectile launcher. At what angle relative to North do you want to fire the projectile
A playground is on the flat roof of a city school, 4.6 m above the street below (see figure). The vertical wall of the building is h = 6.10 m high, forming a 1.5-m-high railing around the playground. Find the vertical distance by which the ball cle..
The half life of Carbon-14 is 5730 years. Suppose the wood from an ancient campsite contains 5.00% of the Carbon-14 found in a present day sample. How old is the wood
An 81-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.1 *10^-2 m^3 and is completely submerged under the water. What is the density of the life jacket
An automible tire is rotated to last for 50,000 miles. Estimate the number of revolutions the tire will make in its lifetime
A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). How far is the object from the converging lens
You have a 1.7 long copper wire. You want to make an N-turn current loop that generates a 1.6 magnetic field at the center when the current is 2.5, What will be the diameter of your coil
Old naval ships fired 14 cannon balls from a 240 cannon. It was very important to stop the recoil of the cannon, since otherwise heavy cannon would go careening across the deck of the ship.
A 60 kg woman stands on a very light, rigid board that rests on the bathroom scale at each end. She is 1.5m away from one side and 0.5 m from the other.
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