An 8.0 m, 280 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.65, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 870 N person climb before the ladder begins to slip?

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a 240lb man is standing on both feet. the contact area for each shoe is 4 inches by 12 inches. the area of contact for each shoe is 48 inches. what is the pressure exerted on the floor.

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An object at rest on a flat, horizontal surface explodes into two fragments, one seven times as massive as the other. The heavier fragment slides 8.50m before stopping. How far does the lighter fragment slide?

Assume that both fragments have the same coefficient of kinetic friction.

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A circular coil 20.0cm in diameter and containing nine loops lies flat on the ground. The Earth's magnetic field at this location has magnitude 8.00

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A 575-g block is dropped onto a relaxed vertical spring that has a spring constant k =200.0 N/m. The block becomes attached to the spring and compresses the spring 58.1 cm before momentarily stopping. While the spring is being compressed, what work is done on the block by the gravitational force on it?What is the speed of the block just before it hits the spring? (Assume that friction is negligible.)

If the speed at impact is doubled, what is the maximum compression of the spring?

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Interactive Solution 8.29 offers a model for this problem. The drive propeller of a ship starts from rest and accelerates at 2.31 x 10-3 rad/s2 for 2.44 x 103 s. For the next 1.00 x 103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.09 x 10-3 rad/s2 until it slows (without reversing direction) to an angular speed of 2.22 rad/s. Find the total angular displacement of the propeller.

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Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is about f = 4.60 x 1012 Hz, and the amplitude is about 3.55 x 10-11 m. For a typical atom, what is its (a) maximum speed and (b) maximum acceleration?

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A novelty clock has a 0.0104 kg mass object bouncing on a spring that has a force constant of 1.28 N/m. How many joules of kinetic energy does the object have at its maximum velocity if the object bounces 2.77 cm above and below its equilibrium position? What is the maximum velocity of the object in m/s? Show work.

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why is a 1 dimensional spectral sequence not enough to classify stellar spectra?

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When the car is skidding, does kinetic friction act on the tire?

When the car is not skidding(wheels rolling), does static friction act on the tire?

If so, explain why.

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A symmetrical table of height 0.780 m, length 1.30 m, and weight 431 N is dragged across the floor by a force applied to its front edge. The force is directed to the right and upward and makes an angle of 30.0° with the horizontal.

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A 28.0 kg beam is attached to a wall with a hinge while its far end is supported by a cable such that the beam is horizontal. If the angle between the beam and the cable is θ = 57.0° what is the vertical component of the force exerted by the hinge on the beam?

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Calculate the energies and wavelengths of the three lowest radiations emitted by H2?

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What is the maximum torque on a molecule of HCl (dipole moment p = 3.60

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A 24 kg mass is connected to a nail on a frictionless table by a massless string 1.1 m long. There is no appreciable friction between the nail and the string. If the tension in the string is 54 N while the mass moves in a uniform circle on the table, how long does it take for the mass to make one complete revolution? (Give answer to the nearest 0.1 s)

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