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A severe thunderstorm dumped 2.5 in of rain in 30 min on a town of area 40 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
A 62.00kg student is standing atop a spring in an elevator that is accelerating upward at 3.8 m/s2. The spring constant is 2600-N/m. By how much is the spring compressed.
A 44 kg woman in an elevator is accelerating upward at a rate of 1.0 m/s2. What is the net force acting upon the woman
A sled weighs 10.0 kg. It is held in place on a frictionless 20.0-degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope if it is parallel to the slope
A 38.0-kg child swings in a swing supported by two chains, each 3.08 m long. The tension in each chain at the lowest point is 426 N. Find the force exerted by the seat on the child at the lowest point
If you connect three resistors with values of 100 ohms, 250 ohms, and 400 ohms together in series, what is the effective resistance of the combination of the three
A glass rod that has been charged to + 17.0nC touches a metal sphere. Afterward, the rod's charge is + 9.0nC
two coupled boxcars are rolling along at 3.5 ms when they collide with and couple to a third stationary boxcar. a what
Two point charges of magnitude 4.0 μC and -4.0 μC are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively
A 2100 kg car moving east at 10 m/s collides with a 3000 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35 ° north of east and at a speed of 5.03 m/s. Find the speed of the 3000 kg car before th..
describe the importance of rare earth elements in science and technology. assess the most common uses of these
A block that has a mass M = 4.25 kg is hanging at rest on a light string. A projectile with a mass m = 250 g moving horizontally strikes M and sticks to it. The block and its projectile swing up and the center of mass rises a distance h = 12.0 cm. Th..
What is the potential energy of a comet of mass m around a star of mass M if it is in elliptical orbit that has a pericenter at a distance R and an apocenter at 4R? What is the total energy of the comet?
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