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A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.082-kg stone strikes the boat at a velocity of 15 m/s, 15° below due east, and ricochets off at a velocity of 8 m/s, 12° above due east. After being struck by the stone, the boat's velocity is 1.9 m/s, due east. What is the mass of the boat? Assume the water offers no resistance to the boat's motion.
An 0.82 kg bucket full of water is being swung by a rope in a vertical circle of diameter 2.31 m. Compute the least speed a bucket must be moving so that the water doesn't fall out.
a frictionless pulley which can be modeled as a 0.80 solid cylinder with a 0.30 m radius has a rope going over it. The tension in the rope is 10 N on the right side and 12 N on the left side. What is the angular acceleration of the pulley.
A stone takes 0.28s to travel past a window 2.2m tall. From what height above top of the window did the stone fall?
Find out the recoil velocity that the raft. At what height above the cannon should the net be placed in order to catch the daredevil.
Find out the magnitude of the wind velocity. Find the direction of the wind velocity.If the wind velocity is 39 due south, in what direction should the pilot set her course to travel due west? Use the same airspeed of 213 .
A freezer is comprised of 1.80x1x0.5 m^3 volume, insulated with 5 cm thick Styrofoam. (1) At what rate should the compressor remove heat to maintain the inside at - 20 degrees Celsius with the outside at room temperature. (2) What is the R-value o..
Find the modulation index corresponding to the given trapezoidal pattern for the AM signal.
assume that you are a Haitian taptap driverand want a more comfortable ride. You decide to replace the springswith new springs that can handle the typical heavy load on yourvehicle. What spring constant do you want your new spring system to have.
First work out the momentum before and after hitting the table. Don't forget the gravitational force.
what is the horizontal distance x between the two balloons.
A man drags a 72.0 kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 26 degrees above the horizontal, and the strap is inclined 68 degrees above the horizontal. The center ..
What is the least (non-zero) thickness for the air layer between two flat, and parallel, glass surfaces if the glass is to appear dark while 640 nm light is incident normally? What if the glass is to appear bright.
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