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an object is thrown upward to a person of a roof . at what point is the objects kinetic energy at its max? at what point is the potential energy of the system at a max? at what locations do these energies have their min values?
A conveyor belt at a quarry lifts 2,000 kg of sand per minute up a vertical distance of 12 meters. The sand is at first at rest, then moves at a speed of 0.20 m/s along conveyor belt. What is the instantaneous power generated by this machine .
A certain type of laser emits light that has a frequency of 5.6 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 3.9 x 10-11 s.
The electric field lines on the left have twice the separation of those on the right. If the magnitude of field at point-A is 60 V/m, what is the magnitude of the field at point-B.
At what coordinate on the axis is the net electric field produced by particles equal to zero.
In 1975 the roof of Montreal's Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift.
A boat moves through the water with two forces acting on it. One is a 1800 N forward push by the water on the propeller, What will its velocity be at the end of that time
One cubic meter of water (see Table 4.4 for the mass density of water) flowing over the Osprey Falls in Yellowstone National Park drops 46 m, what is the temperature increase of the water
A firefighter at a distance d from a burning building directs a stream of water from a fire hose at angle θi above the horizontal as shown in Figure. If the initial speed of the stream is vi. At what height h does the water strike the building?
In soccer, a speed record was set for kicking a soccer ball at 43m/s. If the soccer player kicked the ball from ground level at an angle of 30° from the horizontal, what would be the flight time of the soccer ball? Assume that air resistance is ne..
An arrow is launched vertically upward from a crossbow at 97.9 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight? What is its average speed up to that moment? How high has it risen? What is its instantaneou..
Compute the distance of two point's p1 and p2 in the x-y plane with the following Cartesian coordinates: p1= (-5m, +8m), p2= (+3m, +2m). Draw the position vectors into appropriate-points.
how much weight must each man support. by how much would the temperature of the air rise over a period of 2.0 h due to the metabolism of the people.
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