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The current through a lamp connected across 120 V is 0.48 A. the resistance when the lamp is on is 250 ohm When the lamp is cold, the resistance is one fifth as large as when the lamp is hot 50. What is the current through the cold lamp as it is turned on if it is connected to a potential of 120 V?
A small bag of sand is suspended by a wire of length L=1.2 m. A bullet of mass m=8 gr, moving with speed v0=600 m/s in the horizontal direction, What is the mass of the bag
In a single-slit diffraction pattern produced by electromagnetic radiation from a distant source passing through a slit of width a, What is the wavelength of the electromagnetic radiation
A 539 Hz sound wave travels through a substance. What is the speed of sound in the substance
imagine that you want to shoot an apple hanging in a branch with an arrow. you aim the arrow and at the exact time you
A hydraulic jack is made with a small piston 1.4 cm in diameter that is used to move a large piston 5.8 cm in diameter. how heavy a load can he lift with the jack
A machine in the factory operates from 12 V. To operate from a 240 V line, What would the voltage output be if the transformer were connected backward
Two boxes A and B are connected to each end of a light vertical rope. A constant upward force 80.0 is applied to box. Starting from rest, box descends 10.4 in 3.40. The tension in the rope connecting the two boxes is 37.0
a target in a shooting gallery consists of a vertical square wooden board, 0.25m on a side and with mass 0.75kg, what is the angular speed of the board just after the bullets impact
Light wavelength is 510 nm is directed at a double slit, where the distance between the slits is 450 micrometers. How far away is the second minimum from the central maximum
When a 0.31-kg mass is attached to a vertical spring, the spring stretches by 15 cm. How much mass (total) must be attached to the spring to result in a 0.53-s period of oscillation
Bats use echolocation to determine their distance from objects they cannot easily see in the dark. how close was she to the wall when she received the echo
A person whose eyes are H = 1.64 m above the floor stands L = 2.3 m in front of a vertical plane mirror whose bottom edge is 38 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point o..
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