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We have 651 g of lead which we have cooled down in the freezer to -5.28 degrees C. We also have a jar containing 1000 g of water at room temperature, which is 21.32 degrees C. If we drop the lead into the water, find the final temperature (degrees C) of the water when the lead and water have come to a common temperature. Neglect any flow of heat to or from the environment. Give the answer to 4 significant figures.
An airplane flying horizontally 3600 ft above the ground at 120mi/hh, drops relief aid on the ground. Resolve the angle between the vertical and the line joining plane and target at the instant when he package is released.
A charged water droplet of radius 2.1 mm remains stationary in air.If the electric field of the earth is 151.00 N/C, how many excesselectron charges must the water droplet have?
A crate is dragged 4.0m along a rough floor with a constant velocity by a worker applying a force of 450N to a rope at an angle of 30? to the horizontal. What is the total work done on the crate
A 60-W incandescent bulb with a tungsten filament is connected to a 120-V power supply. the power dissipated by the cold bulb is
A 19.3-g mass of gold in the form of a cube is 1 cm long on each side ( somewhat smaller than a sugar cube). What would be the length of the side of a cube having twice this mass of gold?
an objects temperature increases and in so doing its radiation power increases by a factor of 2.00. what is the ratio
A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 24.5 cm in a uniform electric field, what is the net charge on the ball
question1two blocks are associated by a light string that passes over a frictionless pulley. the block of mass m1 lies
The source of a sound wave has a power of2.50 µW. Assume it is a pointsource. What is the sound level at that distance
One of the problems of in-air testing of nuclear weapons (or, even worse, the use of such weapons!) is the danger of radioactive fallout. What percent of the original level of is left after 56 years
Unpolarized light with an intensity of 650 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
A small rubber ball is launched by a compressed-air cannon from ground level with an initial speed of 18.9 m/s directly upward. How long does it take to reach the maximum height
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