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Bowling balls can be made from a variety of substances and are required to have a circumference of roughly 27.8 inches. The construction of the ball typically consists of a high density core surrounded by a lower density shell. Suppose a bowling ball floats in water with half of its volume submerged. If the specific gravity of the shell is 0.350 and the specific gravity of the core is 0.600, calculate the thickness of the shell.
Work function of potassium is 2.25 eV. Find the cutoff wave length of potassium
A 37-kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 J from 430 J. How high does she rise during this interval? Avoid air resistance.
A ramp inclined at 60.0 degrees with respect to the horizontal rests on a floor. The mass of the ramp is 10.kg, and the coefficent of static friction between the bottom of the ramp and the floor is .8. A 5.0 kg block is then placed on the inclined..
A girl delivering newspapers covers her route by traveling 5.00 blocks west, 4.00 blocks north, and then 8.00 blocks east. What is the total distance she travels
2 long parallel wires carry currents 20 A and 5 A in opposite directions the wires are separted by 20 cm what is the magnetic field between the two wires
A proton ,a neutron and an alfa particle ,accelerated through the same potential difference ,enter a region of uniform magnetic field moving at right angles to B.(a) compare their kinetic energies .(b) if the radius of the proton’s circular path is 1..
A horizontal magnetic field of 1.1×10?4 T is at an angle of 31 to the direction of the current in a straight, horizontal wire 80 cm long. If the wire carries a current of 18 A, what is the magnitude of the force on the wire
100 g ball of clay is thrown horizontally with a speed of 13m/s toward a 900g block resting on a frictionless surface. It hits the block and sticks. The clay exerts a constant force on the block during the 7 ms it takes the clay to come to rest re..
In open heart surgery a much smaller amount of energy will defibrillate the heart. What voltage is applied to the 9.00 µF capacitor of a heart defibrillator that stores 45.0 J of energy
A football is thrown at an angle of 38 above the horizontal. Assume the ball is throw and received at the same height. what must be the initial speed of the ball
A rocket is fired at 48m/s, in a direction 400 to the horizontal. It explodes in mid air, Find the speed of the rocket just before the explosion
A piston-and-cylinder machine contains 0.5 kg of steam at 60 bar and 360 C. The steam expands adiabatically to 1.5 bar and 160 C.
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