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A uniform disc of radius R is spinned to the angular velocity ? and then carefully placed on a horizontal surface. How long will the disc be rotating on the surface if the friction coefficient is equal to k? The pressure exerted by the disc on the surface can be regarded as uniform.
The air inside a bicycle tire pump has 221 joules of work done on it as 60.1 joules of heat is conducted away from it
A car is driving directly north on the freeway at a speed of 100 km/h and a truck is leaving the freeway driving 79 km/h in a direction that is 33 degrees west of north. What is the magnitude and direction of the truck
The best leaper in the animal kingdom is the puma, which can jump to a height of 3.7 m when leaving the ground at an angle of 45°. With what speed must the animal leave the ground to reach that height
A driver in a moving car applies the brakes. The car slows to a final speed of 2.60 m/s over a distance of 40.0 m and a time interval of 8.45 s. What is the car's original speed before braking
Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. Obtain what average power must the winch supply
Assume that a Listeria cell, when at one end of the mammalian cell, emits a pulse of molecules with diffusion constant of D=200 μm2/s. The Listeria cell then moves to the other side of the mammalian cell, reaching the other side of the cell in ..
The diagonal members in the center panels of the truss shown are very slender and can act only in tension; such members are known as counters. Determine the force in member DE and in the counters which are acting under the given loading.
A uniform cord has a mass of 0.300 kg and a length of 6.00 m (see Figure below). The cord passes over a pulley and supports a 2.00-kg object. Find the speed of a pulse traveling from the wall to the pulley
A mass spectrometer has an adjustable magnetic field. When themagnetic field is 7.000e-2 T, a singly ionizedhydrogen atom (a proton) will strike the detector at a particularlocation. Suppose a triply-ionized carbon 12 atom, whose mass is by defini..
A horizontal mass-spring system consists of a 0.32-kg mass attached to a spring with a spring constant of 25 N/m. It is observed that at t = 0 the displacement is x = 0 however the velocity is +2.5m/s. What is the maximum value of the acceleration?
A block is projected with a speed of 2.0m/s on a horizontal surface. If the block comes to rest in 1.2m, What is the coefficient of kinetic friction between the block and the surface
Your friend has a near point of 112 cm, and she wears contact lenses that have a focal length of 34.6 cm. How close can she hold a magazine and still read it clearly
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