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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.
How does the decrease in gravitational potential energy of a falling ball compare to its increase in kinetic energy.
It is 150 cm from your eyes to your toes. You are standing 196 cm in front of a tall mirror. How far is it from your eyes to the image of your toes.
A high-frequency photon is scattered off of an electron and experiences a change of wavelength of 8.0×10-4 .At what angle should a detector be placed to detect scattered photon (relative to the direction of the incoming photon).
A man pushes a lawnmower for 13.1 m along a handle that makes a 28.2° angle with the ground. He pushes with a force of 42.8 N even as the force of friction between the lawnmower and the ground is 13.7 N.
The resistor is connected in series with total set of lightbulbs. What is the value of the resistance? What is the power loss in the resistor.
At what angle must the cannon be fired
determine the value of IG. The support at B does not move while the measurement is taken. For the calculation, the horizontal location of G should be determined.
A tennis ball with a speed of 13.20 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 10.36m/s.
A 2.80 kg gold bar at 98 degrees celcius is dropped into 0.34 kg of water at 23 degree celcius. what is the final temperature? assume the specific heatof gold is 129 J/kg
The gravitational force between two masses M and m separated by a distance r is 40 N. What is the new force when this distance is halved?
You've been walking at a steady, and rope pulls up on the sled at a 21 angle. You estimate that the mass of the sled, with your friend on it, is 64 and that you're pulling with a force of 84.0.
The atomic number of lead is 82. The alpha particle is a helium nucleus, with atomic number 2.
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