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A 9.4-kg watermelon (30 degrees)and a 7.8-kg pumpkin (53 degrees) attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system.
a) Find the accelerations of the pumpkin and the watermelon. Specify magnitude and direction.
b) If the system is released from rest, how far along the incline (cm)will the pumpkin travel in 0.30 s?
c) What is the speed (cm/s)of the watermelon after 0.20 s?
A 800 kg rocket sled can be accelerated at a constant rate from rest to 1300 km/h in 2.4 s. What is the magnitude of the required net force
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Iced tea is made by adding ice to 2.4 kg of hot tea, initially at 70?C. How many kg of ice, initially at 0?C, are required to bring the mixture to 10?C? (Lf = 3.33×105 J/kg, cw = 4,186 J/kg•? C)
A 3.0m length of straight wire carries a current of 18A in a uniform magnetic field of 70mT whose direction is at an angle of 36o from the direction of the current.
A ball of mass 0.60 kg is fired with velocity 200 m/s into the barrel of a spring gun of mass 2.0 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
You may also assume that v_0 gg sqrt{2gL}, so that the change in hammer's gravitational potential energy, as it drives the nail into the block, is insignificant.
A dockworker applies a constant horizontal force of 85.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. What is the mass of the block of ice
Find the total electrostatic potential energy of a solid sphere of radius R that is uniformly charged in volume with total charge Q in terms of Q, R, and k
The speed of a transverse wave on a string is 440 m/s, and the wavelength is 0.13 m. The amplitude of the wave is 1.6 mm. How much time is required for a particle of the string to move through a total distance of 1.0 km?
A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. What is the dielectric constant of this material
An inexperienced hunter shoots at a squirrel sitting in a tree. The squirrel is sitting on a branch that is 22 m above the gun barrel, Write the initial velocity of the bullet in vector form
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