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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?
A small spherical stone is thrown directly upward with an initial speed of 5.00m/s, from some unknown height above the ground. What is the maximum height that the stone reached
The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is one-twentieth of an atmosphere. how far below the water can she swim
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0618 s, during which time it experiences an acceleration of 326 m/s2. The ball is launched at an angle of 57.3° above the ground. Determine..
Long parallel wires separated by 7.5 cm carry 3.3 Amperes each in opposite directions. What magnetic force per length acts on the wires
A person is riding a bicycle, and its wheels have an angular velocity of +19.0 rad/s. How much time does it take for the bike to come to rest
q1. a propeller spins at 1780 revmin.a what is an angular velocity in rads?b what is an angular displacement of the
A map of a burned area obtained from remote sensing contains 120 pixels. The remote sensing image shows that the fire is isolated to 73 of the 120 pixels.
A 12.0-cm diameter loop of wire is initially oriented perpendicular to a 1.5-T magnetic filed. What is the average induced emf in the loop
The two surfaces of a plastic converging lens have equal radii of curvature of 25.0cm, Calculate the index of refraction of the plastic
needing help the secretary of the united states department of agriculture asked your teacher if a chicken-and-a-half
If the air pressure at a particular place in the mountains is 0.75 atm estimate the temperature at which water boils
Light of a wavelength 450 nm is incident on a sodium emitter in a photoelectric effect apparatus. Sodium is 2.3 eV, What is the stopping potential for the emitted electrons
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