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Q. A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaved the cannon with a speed of 450 m/s. What is the recoil speed of the cannon?
Q. Very short pulses of high-intensity laser beams are used to repair detached portions of the retina of the eye. The brief pulses of energy absorbed by the retina welds the detached portion back into place. In one such procedure, a laser beam has a wavelength of 815 , and delivers 221 , of power spread over a circular spot 536 , in diameter. The vitreous humor (the transparent fluid that fills most of the eye) has an index of refraction of 1.34. What is the maximum value of the electric field in the laser beam?
The index of refraction of air is 1, the index of glass 1.55 and the index of water 1.33. Characterize the air bubble as a point source.
A professor's office door is 0.95 wide, 2.2 high, 4 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of door frame. When the door is open and at rest, the door closer exerts a torque of 5..
A helicopter is ascending vertically with a speed of 9 m/s. At a height of 200 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach ground.
A block M1 of mass 16.50 kg sits on top of a larger block M2 of mass 26.50 kg which sits on a flat surface. The kinetic friction coefficient between upper and lower block is 0.405. The kinetic friction coefficient between the lower block and the f..
The objects are then released from rest. Assuming that the particles never reach the pulley, and also that the particles do not rebound when they strike the ground.
The hemisphere is placed on its flat surface, with the center directly over a 2.5 mm long line drawn on a sheet of paper. What length of line is seen by someone looking perpendicularly down on the hemisphere?
A beam of light enters the fiber from air at an angle theta1 with respect to the normal. What is theta1 if light strikes the core-cladding interface at critical angle theta c.
To estimate the muzzle speed of a blow dart, fire dart straight up into the air and time how long it takes to come back down. Roughly half of that time is the time for object to decelerate from its initial velocity to motionless. Estimation the in..
What focal length does the lens require
A pipe with a 2m diameter carries water having a velocity of 4 m/s. What is the mass flow rate of the water in kg/s at the following temperatures.
A 12-inch cast iron water pipe that has been in service for 50 years is found to have extensive corrosion inside. How these conditions would affect friction losses in the pipe describe it.
A horizontal bar of negligible weight has a 55.10 lb weight hanging from the left end and a 72.0 lb weight hanging from the right end. The bar is seen to balance 97.50 in from the left end. Find the length of bar.
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