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The defenders of a castle throw rocks down on their attackers from a 11.5 m high wall. If the rocks are thrown with an initial speed of 13.2 m/s, how much faster are they moving when they hit the ground than if they were simply dropped?
A horizontal mass-spring system has low friction, spring stiffness 250 N/m, and mass 0.370 kg. The system is released with an initial compression of the spring of 10.8 cm, What is the maximum speed during the motion
a cosmic ray travels 60 through the earths atmosphere in 350 as measured by experimenters on the ground. how long does
Calculate the amount of energy saved if all bulbs are replaced by CFL (spiral) bulbs (P=25W). Calculate the amount of natural gas (ft3) needed to provide the energy to keep the lights (long + regular) in the E391 lab
A ball of 1.0 kg mass is tied to the end of a 1m string spinning at a speed of 7 m/s. What angle with the vertical axis does the string make
When a person inhales, air moves down the bronchus (windpipe) at 15 cm/s. The average flow speed of the air doubles through a constriction in the bronchus.
One of the mooring lines of USS BOXER (LHD-4) is under a tension of 4500 N and is set into resonance by the vibration of a CHT pump. What is the period of the 2nd harmonic
Suppose we have a cube of resistors (12 resistors total) all the same resistance R connects as in the figure to left. Find the equivalent resistance between the two diagonally opposite corners
A 4958-kg truck traveling with a velocity of 18.7 m/s due east collides head-on with a 1695-kg car traveling with a velocity of 11.9 m/s due west. find the momentum of each vehicle prior to the collision
A dentist's drill starts from rest. After 3.5 seconds ofconstant angular acceleration, it turns at a rate of 2.51x10^4rev/min. Find the drill's angular acceleration
a stone thrown horizontally from a height of 5.92 m hits the ground at a distance of 13.50 m. calculate the initial
The sun transfers energy to the earth by radiation at a rate of approximately 1.00 kW per square meter of surface. If the solar collectors were arranged in a square array, what would be the length of its sides in kilometers and in miles
the index of refraction for red light in water is 1.331 and that for blue light is 1.340. what are the underwater angles of refraction for the blue and red components of the light
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