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A 0.165-{\rm kg} baseball pitchedhorizontally at 40.0 {\rm m/s} strikes a bat and ispopped straight up to a height of 30.0 {\rm m}.
a) If the contact time between bat and ball is 3.0 {\rm ms}, calculate the magnitude ofthe average force between the ball and bat during contact.b) Find the direction of the average force on the ball.
Estimate the thickness of lead shielding needed to reduce the exposure rate 2.5 m from a 5.92x10^11 Bq point source of Cs-137 to 1.0 mR/hr.
The density of ma ial at the center of a neutron star is approximately 1.00 x 10^18 kg/m^3. Calculate the mass of a cube
Two identical positive charges exert a repulsive force of 7.4 x10-9 N when separated by a distance of 4.8 10-10 m. compute the charge of each.
A mass is attached to a spring. It oscillates at a frequency of 4/? Hz when displaced a distance of 7.00 cm from equilibrium
an average-sized man is sitting in a big tanning room. the tanning radiation from the room walls is controlled by
a particle of charge 40.00 c travels along the negative x-axis with a speed of 100.00 ms. calculate the magnitude of
If a particle that had a charge q=6 micro C and mass 0.2 grams that moves in an uniform external electric and also magnetic fields that are E= ( 2Î +3? +9?) N/C, what is the magnitude of the particles acceleration
A block of unknown mass, m, is brought into the configuration shown. It was measured that upon release the block shot upward a maximum distance of 2m. Calculate the mass of this block? The upper spring has a natural length of 1m, and the lower spr..
A potter's wheel moves uniformly from rest to an angular speed of 0.19 rev/s in 34.0 s. Find its angular acceleration in radians per second
returns the shot with the ball traveling horizontally at 40 m/s in the opposite direction. Illustrate what is the impulse delivered to the ball by the tennis racquet?
q1. two railroad cars each of mass 6300 kg and travelling 88 kmh in opposite directions collide head-on and come to
A pair of eyeglass frames is made of epoxy plastic. At roomtemperature (assume 20 C), the frames have circular lensholes 1.53 cm in radius. To what temperature must the frames beheated in order to insert lenses 1.55 cm in radius?
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