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A rope is used to pull a 3.57 kg block at constant speed 4.06 m along a horizontal floor. The force on the block from the rope is 7.68 N and directed 15.0° above the horizontal. What are
(a) the work done by the rope's force,
(b) the increase in thermal energy of the block-floor system, and
(c) the coefficient of kinetic friction between the block and floor?
An object is placed L = 7.20 cm to the left of a converging lens of focal length 3.00 cm. What is the magnification due to the mirror
In an EM wave traveling west, the B field oscillates vertically and has a frequency of 84.0 kHz and an rms strength of 6.30×10^?9T.
A 137-cm-long wire is made by welding a 1.3-mm-diameter, 26-cm-long copper wire to a 0.31-mm-diameter, What is the resistance of the composite wire
A rotating cylinder about 16 {rm km} long and 6.8 km in diameter is designed to be used as a space colony. With what angular speed should it rotate so that the residents on it will experience the same acceleration due to gravity as on Earth.
An experiment was devised to investigate the effects on the temperature
A diving bell with interior air pressure equal to atmospheric pressure is submerged in Lake Michigan. At what depth is the diving bell
A car is travelling at 15m/s while the driver spots a large pothole in the road a distance 45 m ahead. She immediately applies her brakes. Her acceleration is -9.6 m/s2. What is the stopping distance.
A city has streets laid out in a square grid, with each block 135 m long. If you derive north for three blocks, then west for two blocks, how far are you from your starting point
The following drawing represents the reaction diagram for a sequential reaction of three steps. Explain which of the four steps is likely to be the rate-limiting step at very low temperature and which at very high temperature, and explain why.
Two small identical conducting spheres are placed with their centers 25 cm apart. One is given a charge of 20.0 nC and the other given a charge of -36.0 nC. What is the electrical force of each sphere on the other?
a wheel is rotating at 33.3 rad/s is given an angular accelerationof 2.15rad/s2. Through what angle has the wheel turned when itsangular speed reaches 72.0 rad/s
A uniform disk of mass 4m is rotating an a plane parallel to the ground with angular frequency of 12 rad/sec. What fraction of kinetic energy was lost
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