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Q. A baseball (m = 147 g) approaches a bat horizontally at a speed of 40.5 m/s (90.6 mi/h) and is hit straight back at a speed of 51 m/s (114 mi/h). If the ball is in contact with the bat for a time of 1.36 ms, what is the average force exerted on the ball by bat? Avoid the weight of the bat, since it is so much less than the force of the bat. Select the direction of the incoming ball as positive direction.
Water runs out of the horizontal drainpipe at the rate of 120 liters per minute. It falls 3.20 m to the ground. Assume the water doesn't splash up, what average force does it exert on the ground? (1 liter = 1 kg.)
To transmit only portions of an input wave lying on one side of an amplitude boundary, you would use a.
When an 82.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2 x 10^3 J. By how much does the potential energy of a 17 kg child increase when the child climbs a normal sta..
A 2.00 syringe has an inner diameter of 5.00, a needle inner diameter of 0.270, and a plunger pad diameter (where you place your finger) of 1.20. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. Suppose the ..
On a hot summer day in the state of Washington while kayaking, I saw several swimmers jump from a railroad bridge into the Snohomish River below. The swimmers stepped off the bridge, and I estimated that they hit the water 1 s later.
One mole of an ideal gas does 1408 J of work on the surroundings as it expands isother- mally to a final pressure of 1.6 atm and vol- ume of 29L. Find out the initial volume.
why the mass of the dishwater is large enough. If vector B is added to C = 2.0 ihat + 3.0 jhat, the result is a vector in the positive direction of the y axis, with a magnitude equal to that of C. What is the magnitude of vector B.
illuminate the object with the flashlight. One way to produce artificial gravity in a space station is to spin it.
What is the total displacement and the angle of displacement
How strong is the electric field between the plates.
A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.6m/s at ground level. Its engines then fire and it accelerates upward at 3.80 m/s2 until it reaches an altitude of 930m. At that point its engines fai..
A 950-kg car traveling west at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. Find the speed of the wreckage just after the collision
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