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A hiker, who weighs 919 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3630 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge at the near end?
The motor in a refrigerator has a power of 156 W. If the freezing compartment is at 268 K and the outside air is at 302 K, what is the maximum amount of energy
Four point charges, q, are fixed to the four corners of a square that is 10.3 cm on a side. What is the magnitude of each fixed charge in coulombs
The coefficient of kinetic friction between a 20 Kg box and the floor is 0.40. How much work does a pulling force do on the box in pulling it 8.0 m at the constant speed? The pulling force is directed 390 above the horizontal.
The proper length of one spaceship is three times that of another. The two spaceships are traveling in the same direction and, while both are passing overhead, determine the speed of the faster spaceship
A wooden block of mass 2kg, initially stationary is dragged by a force F with magnitude 20 N along a frictionless incline with an angle 0=30 degrees, What is the wooden block acceleration
A 5.00 g bullet traveling horizontally at 460 m/s is shot through a 2.00 kg wood block suspended on a string 3.00 m long. find the speed of the bullet as it emerges from the block
At our distance from the Sun, the intensity of solar radiation is 1370 W/m2. Compute its steady-state temperature
A plano convex lens of focal length 16 cm is fixed on the side of the box with convex surface outside an object is placed at 26 cm from the lens find the position of the image while (1) the box is empty (2) field with water.
Old naval ships fired 14 cannon balls from a 240 cannon. It was very important to stop the recoil of the cannon, since otherwise heavy cannon would go careening across the deck of the ship.
Assuming wind forces can be neglected, what is the highest that one can make a solid concrete tower of uniform cross-section (Take the density of concrete to be 2,400 kg/m^3)
A raw egg can be dropped from a third-floor window and land on a foam-rubber pad on the ground without breaking. How much is the pad compressed
A 73.0 kg construction worker stands at the far end of the beam.What is the magnitude of the torque about the point where the beam is bolted into place .
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