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1) two blocks, each of mass m=2.80kg are hung from the ceiling of an elevator. If the elevator moves with an upward acceleration a of magnitude 1.9m/s^2, find the tensions T1 and T2 in the upper and lower strings.
2) A block of mass 1.15kg is pushed up against a wall by a force P that makes an angel of theta=50.0 degree angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.289. Determine the possible values for the magnitude of P that allow the block to remain stationary.
For a damped oscillator with a mass of 380g, the spring constant 120 N/m and a damping coefficient of 76 g/s, what is the ratio of the amplitude of the damped oscillations to the initial amplitude at the end of 28 cycles.
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. If the coefficient of friction is unchanged, what is the new acceleration of the box
How to find out the elapsed time
A 50.0-g object is attached to a horizontal spring, What is the velocity of the object when it is halfway to the equilibrium position if the surface is frictionless
At time t = 0 s, a puck is sliding on a horizontal table with a velocity 3.60 m/s, 35.0° above the +x axis, What is the velocity of the puck at time t = 1.50 s
If you place the box on a dolly of mass 4.7 and with coefficient of rolling friction 2.0×10−2, illustrate what horizontal acceleration would that 154 force provide?
We place a 1 mole sample of an ideal monatomic gas in a cylinder with a piston and we heat the gas so it expands and performs work against the piston, How much heat does the gas absorb during the process
Assuming that the total retarding force on the diver is constant at 55.0 N with the parachute closed and constant at 3600 N with the parachute open, what is speed of the diver while he lands on the ground.
A boy uses this string to whirl a 10-kg stone in a horizontal circle of radius 10 m. The boy continuously increases the speed of the stone. At approximately illustrate what speed will the string break?
Find the energy of a photon that is emitted when an electron in a hydrogen atom undergoes a transition from the n=7 level
A projectile of mass 7 kg is fired with an initial speed of 193 m/s at an angle of 16? with the horizontal. At the top of its trajectory, projectile explodes into two fragments of masses 4 kg and 3 kg.
compare with the force of gravitational attraction between them.Find the position of the particle after this time.
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