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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.
Two in-phase loudspeakers are some distance apart. What is the spacing between points where constructive interference occurs? The speed of sound in air is 343 m/s
A diamond has a mass of 56.6 g and the gold ring it is set in has a mass of 125.6 g. How many carbon atoms are there compared to gold atoms
a large electroscope is made with leaves that are 78-cm-long wires with tiny 44 g spheres at the ends. when charged
A 2.6-kg cart is rolling along a frictionless, horizontal track towards a 1.7-kg cart that is held initially at rest. What is the total momentum of the system of the two carts at this instant
There are approximately 120 million TVs in the United States. Each uses, on average, 75 W of power, how much money is spent every day in keeping the TVs turned on
A rock is dropped straight down from the top of a 49.2 meter building. How long does it take for the rock to hit the ground? How fast is the rock moving on impact
A uniform electric field of magnitude 415 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.00 cm. What is the work done by the field on the electron
A projectile is fired at an upword angle of 45.0 degrees from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when it strikesthe ground below
a 25.0 mH inductor is in an AC-circuit with a 150 V ac-source which operates at 60.0Hz. find the inductive reactance
a rock group is playing in a bar. sound emerging from the door spreads uniformly in all directions. the intensity level
A certain type of laser emits light that has a frequency of 5.2 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7 x 10-11 s. How many wavelengths are there in one pulse.
A passenger walks from one side of a ferry to the other as it approaches a dock.Passenger's velocity is 1.50 m/s due north relative to the ferry, What is the magnitude and direction of the ferry's velocity relative to the water
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