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A ball is fall from deck of tall skyscraper 254 m above the street. Determine total time for a ball to free fall from the deck to the street below.
A particle moves from x = 40 cm to x = 50 cm in 5 s in one location of its path. In another location it was found that the particle moved from x = 500 cm to x = 520 cm in 2 s. Is the particle accelerating? If so, find the acceleration if the parti..
A helicopter has blades of length 6 m, rotating at 4.1 rev/s about a central hub. If the vertical component of Earth's magnetic field is 4.5×10?5 T, FIND the maximum emf induced in the coil by Earth's magnetic field
In a water-tank test involving the launching of a small model boat, the model's initial horizontal velocity is 20 ft/s and its horizontal acceleration varies linearly from - 40 ft/s2 at t = 0 to - 6 ft/s2 at t = t1 and then remains equal to -6 ft/..
During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 4.10 108 V, What is the change in an electron's electric potential energy
A helicopter is ascending vertically with a speed of 9 m/s. At a height of 200 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach ground.
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The truck accelerates forward on level ground. What is the maximum acceleration the truck can have so that the crate does not slide relative to the truck's flatbed
A diver can reduce her moment of inertia by a factor of 3.5 when changing from a straight position to the tuck position. find her angular speed when in the straight position
an electron and a proton are fixed at a separation distance of 931 nm. find the magnitude and direction of the electric
A 21.3 kg object is pushed down a 26.3 cm long inclined plane that makes an angle of 15.7 degrees with the horizontal at a constant velocity. If the coefficient of kinetic friction is 0.35, then what is the work done by friction on the object? Assume..
An 75.0-N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 30.0° to the ground. What is the direction of the contact force
assume you have a perfectly isolated closed system under reversible and isothermal conditions where pv 0.8
fred wants to figure out how much extra it cost him to heat his house at 75.00 f so he does an experiment. he picks a
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