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A 39.2-kg boy, riding a 2.67-kg skateboard at a velocity of +5.37 m/s across alevel sidewalk, jumps forward to leap over a wall. Just afterleaving contact with the board, the boy's velocity relative to the sidewalk is 5.52 m/s, 9.72° above the horizontal. Ignore anyfriction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Besure to include the correct algebraic sign with your answer.
A helium gas cylinder has a pressure of 28 atm. After filling many balloons the cylinder has a pressure of 5 atm. What fraction of the original amount of helium remains in the cylinder
points a and b have electric potentials of 249 v and 129 v respectively. when an electron released from rest at point a
A skier starts from rest at the top of a 48 m hill, skis down a 32° incline into a valley, and continues up a 28 m high hill. How fast is the skier moving at the bottom of the valley
Calculate the length of the transmitter antennain order for it to be exactly one half the wavelength of this transmission frequency
We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 72.0kg and diameter 1.20m. What percent of his total kinetic energy is rotational
A 35kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, How high does she rise during this interval
A wire carries a current of 0.665 A. This wire makes an angle of 55.5° with respect to a magnetic field of magnitude 4.92E-5 T, What is the length of the wire
A sound wave generated by a source of frequency 440 Hz is moving through 25 oC air. What is the wavelength of the sound wave inside the steel
At a constant speed of 55 km/h , an automobile travels 600m along a straight highway that is inclined 5.0 degrees to the horizontal. What is the cars vertical velocity magnitude
One of the asteroids, Ida, looks like an elongated potato. Surprisingly it has a tiny (compared to Ida) spherical moon! Find the acceleration of gravity on the surface of this little moon
a particle beam is made up of many protons each with a kinetic energy of 3.25times10-15j. a proton has a mass of
A 41.0 mA current is carried by a uniformly wound air-core solenoid with 455 turns, a 10.0 mm diameter, and 13.0 cm length. Compute the magnetic field inside the solenoid
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