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A force of 100 N is applied straight down to lower a handle from 45° above the horizontal to 45° below it. The handle is 1 m long and the force is applied at its end throughout the motion. What is the rate of change of the moment as the angle of the handle moves? What if the force moved down in a straight line, rather than remaining at the end of the handle?
A bullet is fired from at a shooting range. The bullet hits the ground after 0.32 s. Find how far did it travel horizontally and vertically in this time
The nucleus of an atom consists of protons and neutrons (no electrons). A nucleus of a carbon-12 isotope contains six protons and six neutrons.
Suppose you moved a box across a rough horizontal surface with a 50 N force over a displacement of 10 m. If the frictional force at the interface was 10 N, how much work was done to the box?
A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. When the amplitude of the motion is 0.090m, it takes the block 2.44s to travel from x= 0.090m to x= -0.090m . If the amplitude is doubled, to..
an air capacitor is made from two flat parallel plates 1.50 mm apart. the magnitude of charge on each plate is
Calculate the electric field at the center of a square 52.5 cm on a side if one corner is occuppied by a +45.0 uC charge and the other three are occupied by -27.0 uC charge
A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. With what speed do the supplies land in the latter case
A bicyclist makes a trip that consists of three parts, each inthe same direction (due north) along a straight road. During thefirst part, she rides for 22 minutes at an average speed of6.50 m/s. During the second part, she rides for 36 minutes ata..
A spherical boulder with a volume of 1800 m3 and a density of 2.7 x 10 3 kg / m3 starts to roll down a 30 degree incline that is 130 m long. At the end of the incline is a 450 m cliff. How far in the horizontal will the boulder have traveled upon la..
the primary windings of a transformer which has an 80 efficiency are connected to110 v ac. the secondary windings are
Suppose the speed of light in a vacuum were only 25.5 mi/h. Find the length of the bicycle being ridden at a speed of 20.0 mi/h as measured by an observer sitting on the park bench, given that its proper length is 1.59 m.
A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 12 rpm in 10.0 s. What force is required at the edge
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