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Question: Suppose equal weights are put on the two pans of a beam balance, the arm is kept at an angle with the horizontal and released. Is the torque of the two weights about the middle point (point of support) zero? If so, why does the arm rotate and finally become horizontal?
When starting a foot race, a 70 kg sprinter exerts an average force of 650N backward on the ground for 0.800 s. What is the sprinters final speed?
An object is located 45 centimeter from a certain mirror. The image is half the size of the object, inverted, and real. Evaluate the radius of curvature of the mirror
A parallel-plate capacitor is connected to a battery and stores 4.7nC of charge. Then, while the battery remains connected, a sheet of Teflon is inserted among the plates. By how much does the charge change?
The distance between the eyepiece and the objective lens in a certain compound microscope is 12.7 cm. The focal length of the objective is 0.540 cm, determine the overall magnification of the microscope
q1. what must the charge sign and magnitude of a particle of mass 1.47 g be for it to remain stationary when placed in
A rotating wheel requires 5 second to complete 50 revolutions. Its angular speed at the end of the 5 second interval is 75 rad/s. Obtain what is the constant acceleration of the wheel
Scientists have observed the average lifetime of these rapidly moving particles to be about 10 times longer than what it would be for muons in the laboratory reference frame. Approximately how fast must the muons be traveling relative to Earth?
a crate of mass 188 kg is loaded onto the back of a flatbed truck. the coefficient of static friction between the box
a positive charge q 8000.00 is uniformly distributed over the volume of a sphere of radius r 7.00 . suppose a
A 31 kg child sits in a swing supported by two chains, each 4.5 m long. If the tension in each chain at the lowest point is 243N, find the childs speed at the lowest point
A 1600 kg car is traveling along a straight road at 17 m/s. Two seconds later its speed is 24m/s. What is the magnitude of the net force on car during this time.
The current in the solenoid below is increasing, the solenoid is surrounded by a conducting loop. Is there a current in the loop? If so, in what direction (clockwise or counter-clockwise)?
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