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Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can throw the ball is 91.0 mph. Bob starts the stopwatch as he throws the ball (with no way to measure the ball\'s initial trajectory), and watches carefully. The ball rises then and then falls, and after 0.910 seconds the ball is once again level with Bob. Bob can\'t see well enough to time when the ball hits the ground. Bob\'s friend then measures that the ball landed 398 ft from the base of the cliff. How high up is Bob, if the ball started from exactly 5 ft above the edge of the cliff?
A skier approaches the base of an icy, frictionless hill with a speed of 14.4m/s. Find the acceleration of this skier when she is going up the hill
An airplane propeller is 2.78{m} in length (from tip to tip) and has a mass of 117{kg} . When the airplane's engine is first started, it applies a constant torque of 1970{N * m} to the propeller, which starts from rest
If you lift the front wheel of a poorly maintained bicycle off the ground and then start it spinning at 0.72 , what is the magnitude of the frictional torque
Calculate Earth's average speed relative to the Sun (in m/s). According to my book, the answer is 3.0x10^4 m/s
Find maximum height reached by the diver using the equation of motion.
In fair weather, over flat ground, there may be a downward electric field of 125 N/C. find the total charge on the Earth and the charge per unit area
two small plastic spheres each have a mass of 2.0 g and a charge of -50.0 nc. they are placed 2.0 cm apart.what is the
Light of wavelength 650 nm is incident normally upon a glass plate. What is the highest order bright fringe
A total of 26 bright and 26 dark Newton's rings (not counting dark spot at the center) are observed when 540 light falls normally on a planoconvex lens resting on a flat glass surface.How much thicker is the center than edges.
A frictionless pulley has the shape of a uniform solid disk of mass 6 and radius 25 . A 1.90 stone is attached to a very light wire that is wrapped around the rim of the pulley.
You have two lenses separated by 25cm. Lens one is onthe left it has a focal length of 15cm. What is the image going to look like
A block of wood floats in water with 0.64 of its volume submerged. When placed in oil, the submerged fraction of the volume is 0.88. Find the density of the wood. Find the density of the oil
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