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How much work is done by a 86.5 kg man running up a flight of stairs 20.0m long in 4.25 seconds if the stairs make an angle of 55* with the vertical wall to which the stairs are fastened?
how much power does the man exert while running?
Light inside an optical fiber tube hits the wall between the tube and air. What is the index of refraction of the tube
Neutrons (RBE = 3.4) and %u03B1 particles have the same biologically equivalent dose. What is the RBE for the %u03B1 particles
A rod of length l and uniform mass m is hinged at its lower end while it was held at rest in a vertical position. What is the angular acceleration of the rod during the fall for a given theta
A charge of -3.80 nC and a charge of -6.00 nC are separated by a distance of 60.0 cm. Find out the position at which a third charge of +7.30 nC could be placed so that the net electrostatic force on it is zero.
What current is required in the windings of a long solenoid that has 1710 turns uniformly dispersed over a length of 0.547 m in order to produce a magnetic field of magnitude 0.0002 T at the center of the solenoid.
A radio station broadcasts at a frequency of 92.0 MHz with a power output of 51.8 kW. what is the energy of each emitted photon
Two lenses having focal lengths of f1=15 cm and f2=9 cm are separated by a distance of 50cm. If the lenses are moved into contact, what is their combined focal length
In order to find the density of an unknown material Susan measured the mass of a cube made out of this material and the length of its side
A 0.1kg ball is attached to a string and whirled around in a circle overhead, What is the maximum speed the ball can have when the radius of corcle is 1m
A Carnot engine absorbs 940 J of heat each cycle and provides 380 J of work. How much heat is rejected each cycle
You are traveling on an airplane. The velocity of the plane with respect to the air is 110 m/s due east, What is the heading of the plane with respect to the ground
A block of mass 2.50 kg is pushed 2.60 m along a frictionless horizontal table by a constant 20.0 N force directed 25.0° below the horizontal. Determine the work done by the net force on the block
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