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A girl pulls a 26 kg block 6.44 m along a level floor at constant speed with a horizontal force. If the coefficient of kinetic friction between block and floor is 0.25 , what is (a) the work done by the girl's force and (b) the increase in thermal energy of the block-floor system?
A projectile is fired at v0 = 394.0 m/s at an angle of θ = 64.2o with respect to the horizontal, How far will the projectile travel in the horizontal direction, R
Suppose you have the following intermediate (i.e., important figures may be incorrectly stated) experimental results: L = 0.739 ± 0.026 m , f1 = 36.48 ± 1.82 Hz , T = 5.28 N (exact) . What is the linear mass density of the string (without uncertainty..
A popcorn kernel initially at rest explodes into two pieces, one piece having twice the mass of the other. What is the ratio of the velocities of the fragments
explosives are used to blow a rock apart. the explosion blows the rock into three fragments. two fragments go off at a
If a gas was in a 7.5 liter flexible container under 4atmospheres of pressure, compute how would the volume of the gas change
A photon of wavelength 0.91000 nm strikesa free electron that is initially at rest. The photon is scattered straight backward. What is the speed of the recoil electron after the collision
The motor of a ski boat generates an average power of 7.20 x 104 W when the boat is moving at a constant speed of 11 m/s. What is the tension in the tow rope
A charge ±Q is placed on the plates of a parallel-plate capacitor. By what factor does the electric potential energy (PE) stored in this capacitor change
A lead ball is dropped into a lake from a diving board 5.08m above the water. It hits the water with a certain velocity and then sinks to the bottom with this same constant velocity. It reaches the bottom 4.72s after it is dropped ( Assume the positi..
A block of unknown mass is attached to a spring with aspring constant of 5.00 N/m and undergoessimple harmonic motion with an amplitude of 11.0 cm. When the block is halfway between its equilibrium position and the end point, its speed is measured..
A large balloon of mass 222 kg is filled with helium gas until its volume is 335 m3. Assume the density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3. Calculate the buoyant force acting on the balloon
a convex spherical mirror whose focal length has a magnitude of 15.0cm is to form an image 10.0cm behind the mirror. a
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