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1. An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
2. A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
The water in a tank is at a gauge pressure of 259,145 Pa. If the bottom of the tank that has an area of 0.5 m2
A 5.17-g bullet is moving horizontally with a velocity of +340 m/s, where the sign + indicates that it is moving to the right, What is the velocity of the second block after the bullet imbeds itself
The graph of two cars that collide shows that they intersect at a point 5.5m on a distance/time graph. The first car has a velocity of 0.39m/s. How do the two sets of values compare
The wheel of an automobile has a mass of 25 kg and a diameter of 67.0 cm. What is the angular momentum of the wheel about its axle when the automobile is traveling at 25 m/s (90 km/h) on a straight road
A nonreflective coating (n = 1.35) covers the glass (n = 1.52) of a camera lens. determine the minimum nonzero thickness that the coating can have
A 4.9-N hammer head is stopped from an initial downward velocity of 3.2 m/s in a distance of 0.45 cm by a nail in a pine board. Calculate the downward force F exerted by the hammer head on the nail while the hammer head is in contact with the nail a..
A person stands on a scale inside an elevator at rest. Thescale reads 800N. What is the person's mass
a batter hits a fly ball which leaves the bat 0.88m above the ground at an angle of 62 with an initial speed of 29m/s heading toward centerfield. how far from home plate would the ball land if not caught
At large distances, a bar magnet acts like the magnetic dipole created by a current carrying loop. Imagine such a magnet is oriented as shown. What is the magnetic dipole moment of the bar
The text of the question is as follows "Anengine flywheel is rotating at 25.0 Rads per second. calculate the number of revolutions made by the fly wheel in stopping
The total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device. Obtain the total current delivered by the source
First-order Bragg diffraction is observed at 23.0 degrees relative to the crystal surface, with spacing between atoms of 0.26nm, At what angle will second order be observed
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