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An archeologist on a dig finds a fragment of an ancient basketwoven from grass. Later, it is determined that the carbon-14content of the grass in the basket is 9.93% that of anequal carbon sample from present-day grass. What is the age of thebasket?
If a man is capable of lifting a 149 lb stone on land, how heavy a stone could he lift under water? The specific gravity of the stone is 2.45
What is the force acting on the board because of the left support when a diver of mass 63.20 kg stands at the end of the board over the water? Suppose that these forces are vertical.
Calculate the de Broglie wavelength for an alpha particle (He-e nucleus) with energy E = 4.2 GeV (which is emitted in the radioactive decay of U-238)
A helium-neon laser emits a beam of circular cross section with a radius r and a power P. Find the maximum electric field in the beam
A 11 g bullet is fired horizontally into a 109 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 142 N/m. The bullet becomes embedded in the block.
A 6.30kg block is pushed 9.45m up a smooth 37.0? inclined plane by a horizontal force of 80.0N . If the initial speed of the block is 3.35m/s up the plane. Calculate the initial kinetic energy of the block
An infinitely long line of charge has linear charge density 5.00 x10-12 C/m. A proton (mass 1.67 x10-27 kg, charge +1.60 x10-19 C) is 18 cm from the line and moving directly toward the line at 1.50 x103 m/s. How close does the proton get to the li..
A proton, mass 1.67 x 10^-27 kg, is projected horizontally midway between two parallel plates that are separated by 0.30 cm, find minimum speed of the proton that just misses the lower plate as it emerges from the field
The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 7.20×10?3kg, Find the momentum of the propellant gases in a coordinate system attached to the earth as they leave the muzzle of the rifl..
A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the red ball after the collision?
A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration a = (4.40 m/s2)i + (7.00 m/s2)j. At time t = 0, the velocity is (4.2 m/s)i. What are magnitude and angle of its velocity when it has been displaced by 11.7 m..
q1. a ferris wheel is a vertical circular amusement ride with radius 6 m. riders sit on seats that swivel to remain
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