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In the old days when we still used motor-less lawn movers, the mover was a roller with blades and a handle by which we would pull or push the mover. As the mover is pushed, the roller with blades would turn and you could cut the grass. One particular model of the mover had a roller of diameter of 19 inches. The roller weighs 200 lb. What is the minimal force you need to use to pull the roller over a 2 inch tall curb if the handle makes 30 Degree angle with the horizontal?
bob whose mass is 36 kg stands at the center of a 200 kg merry-go-round that is spinning at 30 rpm. What is the spinning rate now
A person pushes a 16.0 kg shopping cart at a constant velocity for a distance of 30.0 m. She pushes in a direction 26.0° below the horizontal. Determine the work done by the gravitational force
A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 68 ° with the normal to the wall. What is the beam's pressure on the wall
A spring is hung from the ceiling. A 0.375 -kg block is then attached to the free end of the spring. Find the angular frequency of the block's vibrations
Consider a hydrogen atom in a magnetic field. Sketch the possible transitions among the n = 3, l = 2 and n = 2 and l = 1 levels. Which lines will not appear if we need that Δm = 1,0, and -1 only? How many spectral lines with dissimilar frequencies wi..
A girl delivering newspapers covers her route by traveling 4.00 blocks west, 4.00 blocks north, and then 6.00 blocks east. What is the total distance she travels
A diffraction grating produces an interference pattern on a wall. How many lines per meter does the grating have
Assuming the Earth's magnetic field averages about 0.50*10^-4 T near the surface of the Earth, estimation the total energy stored in this field in the first 6.5 km above the Earth's surface.
In a ballistic pendulum experiment, a small marble is fired into a cup attached to the end of a pendulum. How high will the pendulum swing if the marble has an initial speed of 5.65 m/s
A tennis ball initially moves with a velocity of 26.0 m/s horizontally to the right. A tennis racket strikes the ball, giving it a velocity of 26.0 m/s to the left. Find the initial velocity of the racket
Draw the situation and define a workable set of generalized coordinates that could be used to solve the problem of a child on a swing using the Lagrangian method.
A parallel-plate capacitor in air has a plate separation of 1.42 cm and a plate area of 25.0 cm2. What is the change in energy of the capacitor
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