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Two small metallic spheres, each of mass m = 0.220 g, are suspended as pendulums by light strings of length L as shown in the figure below. The spheres are given the same electric charge of 7.8 nC, and they come to equilibrium when each string is at an angle of θ = 4.50° with the vertical. How long are the strings?
An elevator releases 11200J of gravitational potential energy as descending 4m between floors. How much does elevator weigh.
A person weighs 670N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. What is the spring constant? And what is the weight of another person who compresses the spring by 0.34 cm.
What is the free-fall acceleration at the surface of the moon and What is the free-fall acceleration at the surface of the Jupiter
A proton (m=1.67x10-27 kg) is being accelerated along a straight line at 3.6*10^5 m/sec2 in a machine. If the proton has an initial speed of 2.4x10^7 m/sec.
A horizontal mass-spring system has low friction, spring stiffness 250 N/m, and mass 0.370 kg. The system is released with an initial compression of the spring of 10.8 cm, What is the maximum speed during the motion
Consider a tungsten filament in a light bulb. After the bulb has been on for an hour, how has the resistance in filament changed (if at all).
What is the resultant displacement when a dog runs 36 m North, and then changes direction to run 13.6 m West? answer sketching diagram and showing all calculation.
What is the magnitude
To what angle beta can the sculpture be tipped.
What is the final angular velocity
the absolute portential at the exact center of a square is 3.0v when a charge of +Q is located at one of the squares corners. What is the absolute potential at the squares center
A 1.35 kg object is moving in the x direction at 16.4 m/s. Just 3.61 s later, it is moving at 28.8 m/s at 36.0^circ to the x axis. What is the magnitude of force applied throughout this time.
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