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A batter strikes a baseball moving horizontally towards him at 15 m/s. This ball leaves the bat horizontally at 24 m/s, 40o to the left of the line from the plate to the pitcher. The ball is in contact with the bat for 0.01second. Find the change in velocity of the ball and find the average acceleration while being hit by the bat.
A suspicious-looking manruns as fast as he can along a moving sidewalk from one end to theother, taking 3.50 s. Then security agentsappear and the man runs as fast as he can back along the sidewalk to his starting point, taking 11.0 s.
A rocket has a total mass of 1.12 105 kg and a burnout mass of 1.09 104 kg, including engines, shell and payload. Estimate the speed at burnout if gravity isn't neglected
Assume that at sea-level the air pressure is 1.0 atm and the air density is 1.3 kg/m3. What would be the height of the atmosphere if the air density were constant
Half-life of C^14 is 5730 yr. Find its decay constant. If we have 4.8X10^14 atoms of C^14, after 10000yr. How many of them will be left
Two small nonconducting spheres have a total charge of 93.1 C. When placed 1.01 m apart, the force each exerts on the other is 11.5 N. What is the charge on each? What if the force was attractive?
A 1.6-rm MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats.
a 0.50 kg mass is attached to a spring with a force constant of 21 nm and released from rest a distance of 3.5 cm from
Suppose that you wish to mold a uniform wire from 1.50 g of copper. The wire needs to have a resistance of 0.0400 ohm's, What should be the diameter fo the wire?
A 35.0-g bullet moving at 475 m/s strikes a 3.2-kg bag of flour that is on ice, at rest. The bullet passes through the bag, leaving at 225 m/s. How fast is the bag moving while the bullet exits.
When its coil rotates at a frequency of 294 Hz, a certain generator has a peak emf of72 V. What is the peak emf of the generator when its coilrotates at a frequency of 41 Hz?
an object floats on water with 84 of its volume below the surface. the same object when placed in another liquid floats
A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. If the force is 10% greater than your answer for (a), what is the acceleration of each block
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