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A ball launcher on the ground is aimed straight up, and it launches a baseball with an initial velocity of 49.0 m/s [up]. The ball continues upward to a stop, and then falls until caught by a player leaning out of a window 78.4 m above the ground. How long is the ball in the air before the player catches it?
A light bulb at point x in the frame of reference O blinks on and off at intervals, ?t = t2 - t1. Use the expressions for the Lorentz transformations to derive the expression for the time dilation relations ?t and ?t'
A 53 % efficient device uses chemical energy to generate 560 J of electric energy. 1100 J of energy is used. A second device utilizes twice as much chemical energy to generate half as much electric energy. What is its efficiency?
A 200 g block is pressed against a spring of force constant 1.4 k N/m until the block compresses the spring 10 cm, the spring rests at the bottom of a ramp inclined at 60 degrees to the horizontal.
Ethyl alcohol flows through a horizontal tube of diameter 3.00 cm that is joined to a second horizontal tube of diameter 1.62 cm. What is the speed of flow in the first tube
A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.58). White light is incident normal to the film. Estimate the thickness of the acetone film
how much work is required to turn an electric dipole 180deg in a uniform electric field of magnitude e 41.0 nc if p
How much distance does the car cover during this 1.93 s time period? What is the speed of the car 1.93 s after it starts from rest?
15 O and 131 I are isotopes used in medical imaging 15 O is a beta-plus emitter, 131 I a beta-minus emitter. What are the daughter nuclei of the two decays?
How much heat must be added to 60g of water at an initial temperature of 66C to heat it to the boiling point?
However, as the drawing shows, a plane mirror reflects light from the bird into your camera. If x = 4.2 m and y = 3.9 m in the drawing, for what distance must you set focus of the camera lens in order to snap a sharp picture of the bird's image.
You may have observed that water waves advancing toward the shore have their wavefornts almost always parallel to the shoreline, independent of the direction of the wind. Nothing the fact that the velocity of waves in water decreases as the depth of ..
Assume that electrons are the charge carriers and the conduction electron density is 2.35 x 10^23/ m^3. then calculate the electron drift speed in the wire.
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