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An indestructible bullet, 2cm long, is fired straight through a board which is 10 cm thick. The bullet strikes the board with a speed of 420m/s and emerges with a speed of 280m/s. What is the average acceleration of the bullet through the board? What is the total time the bullet is in contact with the board? How many thicknesses of board ( calculated to the nearest tenth cm ) would it take to completely stop the bullet?
An artificial lens is implanted in a person's eye to replace a diseased lens. The distance between the artificial lens and the retina is 2.70 cm. What is the power of the implanted lens
Identical samples containing 32P are measured for a period of 1 hr in a counter having an efficiency of 44 percent and a negligible background. From a large number of observations, the mean number of counts in 1 hr is (2.93 x 10^4)
Two archers shoot arrows in the same direction from the same place with the same initial speeds, but at different angles. how far apart are the two arrows when they land
You need to connect a 43k\Omega resistor and one other resistor to a 110 \rm V power line. what should be the value of the unknown resistor
q1. three long wires wire 1 wire 2 and wire 3 hang vertically. the distance between wire 1 and wire 2 is 20.0 cm. on
Electric charge Q has been spread uniformly over a circular arc of radius R and central angle 40 degrees. What is the potential at point P, center of curvature of the arc.
At time t=0s, a wheel has an angular displacement of zero radians and an angular velocity of (+28) rad/s. Calculate the average angular velocity in the interval from t=0 to t=20
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -17.30 eV. What is the energy of the first photon emitted
A 1.8 kg ball of putty moving to the right has a head-on inelastic collision with the .50 kg putty ball moving to the left. If the combined blob doesn't move just after the collision, what can you end about the relative speeds of the balls before the..
If the ropes supporting the rings are attached to ceiling directly above, what is the tension in each rope.
A cannonball sits on top of a 10 meter cliff and is fired at a 10 degree angle with an initial velocity of 50 m/s. What is the maximum height of the cannonball relative to the ground? At maximum height what is the magnitude of the velocity? How lo..
Occasionally, huge icebergs are found floating on the ocean's currents. Suppose one such iceberg is 134 km long, 39.4 km wide, and 187 m thick.
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