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A person jumps from the roof of a house 2.8 m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. If the mass of his torso (excluding legs) is 42 kg, find
(a) his velocity just before his feet strike the ground, and
(b) the average force exerted on his torso by his legs during deceleration.
Two long parallel wires carry currents of 2.83 A and 5.41 A. Find the separation distance of the wires expressed in millimeters
a lost shipping container is found resting on the ocean floor and completely submerged. the container is 5.9 m long 2.9
Particle A of charge 2.97 x 10-4 C is at the origin, particle B of charge -6.60 x 10-4 C is at (4.00 m, 0), What is the x component of the electric force exerted by A on C
water flows at 0.20ls through a 8.0-m-long garden hose 2.5cm in diameter that is lying flat on the ground. the
In a police ballistics test, a 2.00-g bullet suddenly hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.60-m long string. This causes the block to swing through an arc of 5.50°. What was the speed of the bullet just b..
The windows in an office building are 4.0 m by 5.0 m. On a stormy day, air is blowing at 30m/s past a window on the 53rd floor. Discover the magnitude and direction of the net force on the window. The density of air at that height is 1.23 kg/m3.
A 121.2 N carton is pulled up a frictionless baggage ramp inclined at 27.0 degrees above the horizontal by a rope exerting a 73.2 N pull parallel to the ramp's surface. Calculate the work done on the carton by the gravity
A particle of mass 2 units moves along the x-axis attracted toward the origin by the force whose magnitude is numerically equal to 8x. find the differential equation describing the motion
As part of a safety investigation, two 1900 kg cars travelling at 19 m/s are crashed into different barriers. Determine the average forces exerted on (1) car that hits a line of water barrels and takes 1.7 s to stop, and (2) car that hits a concre..
An industrial flywheel with a moment of inertia of 445kg?m2 rotates with a speed of 6500rpm. How much work is required to bring the flywheel to rest
A piece of machinery with a momentum of inertia of 2.6 kg m2 rotates with a constant angular speed of 4.0radians/second when a frictional torque of 0.56 mN acts on it. What is the net torque acting on the piece
As an electron moves through a region of space, its speed decreases from 6.40 106 m/s to 2.20 106 m/s. Did the electron move to a higher potential or a lower potential
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