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A box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 30 degree above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, correspondingly. The box slides down unless the applied force has magnitude 43 N.
Find what is the mass of the box?
suppose that after walking across a carpeted floor you reach for a doorknob and just before you touch it a spark jumps
The three particles shown move along a straight line (1-D). One particle is initially moving to the right, while the other particles are stationary and separated slightly, as shown in the figure. The two stationary particles have the same mass whi..
A ship sets out to sail to a point 212 km due north. An unexpected storm blows the ship to a point 156km due east of its starting point. How far must it now sail to reach its original destination.
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A 15 kg block is accelerated at 1.7 m/s2 up a frictionless plane inclined at 5.0° to the horizontal, find the change in the block's mechanical energy
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When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of 20 km (about the size of San Francisco). If a neutron star rotates once every second, (a) what is the speed of a particle..
A 1 170.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 9 800.0 kg truck moving in the same direction at 20.000 m/s. What is the change in mechanical energy of the car-truck system
q1. a caterpillar climbs up a one-meter wall. for every 3 cm it climbs up it slides down 1 cm. it takes 10 minutes for
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