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A wheelbarrow 6.00 feet long is used to haul a 180 pound load. How far, in feet, from the wheel is the load placed so that a person can lift the load with a relatively small force of 45.0 pounds?
Every year, there is a foot race to the top of the Empire State Building. The vertical distance traveled (using the stairs!) is about 440 m. what was his average power output during the race
An electric field of 8.60 x 107 V/m is desired between two parallel plates, each of area 35.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate.
A wheel turns with an initial angular velocity of 5.0 1/s. Calculate the number of rotations the wheel makes if it slows and stops with a constant angular acceleration of -0.015 1/s2
a 406.0 kg copper bar is put into a smelter for melting. the initial temperature of the copper is 300.0 k. how much
For the infinite square well problem an electron spends 40% of its time in the n=3 state and 60% of its time in the n=5 state. What is the average energy of the electron
A charging RC circuit controls the intermittent windshield wipers in a car. The emf is 12.0 V. What resistance should be used in the charging circuit
A piston (with mass M = 2.0 kg) in a car engine is in vertical simple harmonic motion with amplitude A = 5.0 cm. What is the maximum velocity (m/s) of the piston
She measures a distance of 30.0 m from one stake to another on the same side of the river, thus finding the third vertex on a right triangle. She then measures the angle q and finds it equal to 75.9o. What is the distance across the river?
An electron accelerated from rest through a voltageof440 V enters a region of constant magneticfield. If the electron follows a circular path with a radiusof 16 cm, what is the magnitude of the magneticfield?
a box sits on a horizontal wooden board. the coefficient of static friction between the box and the board is 0.32. you
A 2.40kg mass is pushed against a horizontal spring of force constant 26.0N/cm on a frictionless air table. The spring is attached to the tabletop, Find the greatest speed the mass reaches
A 1.00-m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 1.00 m/s. Calculate the magnitude of the induced emf between the ends of the wire
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