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A baseball (m = 155 g) approaches a bat horizontally ata speed of 39.1 m/s (87.5 mi/h) and is hit straight back at a speedof 48.6 m/s (109 mi/h). If the ball is in contact with the bat fora time of 1.93 ms, what is the average force exerted on the ball bythe bat? Neglect the weight of the bat, since it is so much lessthan the force of the bat. Choose the direction of the incomingball as the positive direction.
a large parallel plate capacitor has plate separation of 0.92 cm and plate area of 266 cm2. the capacitor is connected
The intensity of electromagnetic waves from the sun is 1.4 kW/m2 just above the earth's atmosphere. How many joules of solar energy fall on your back as you work on your tan for 0.90h
Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1400kg/s with a speed of 7.1×104m/s
a steady wind of 25 knots over a very long fetch can create waves of 3-meter height a period of approximately 10
A 4.79 crate is suspended from the end of a short vertical rope of negligible mass. An upward force is applied to the end of rope, and the height of the crate above its initial position is given by + (0.61) what is the magnitude of the force when ..
an important radionuclide produced in water-cooled nuclear reactors is 16n which has a half-life of 7.13 s and emits
question1at what distance from a proton is the magnitude of its electric field 2.3times105? what is magnitude of the
Consider the interaction between an electron and a proton separated by some distance r. Compare the electrostatic force to the force of Universal Gravitation. Calculate the ratio of Fg to Fe.
A railroad car of mass 2.5 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
The pressure of a helium gas cylinder is 29.7 atm. After several balloons have been blown up the pressure is decreased to 5.68 atm. What fraction of the original gas remains in the cylinder?
Solar Energy Reaches the earth at the rate of about 1400 watts per sqaure meter of surface perpendicular to the direction of the sun. By how much does the mass of the sun decrease
A closed box is filled with dry ice at a temperature of -80.4 oC, while the outside temperature is 20.8 oC. Find the thermal conductivity of the material from which the box is made
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