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A 31 kilogram girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 Joule from 420 J. Find how high does she rise during this interval? Ignore air resistance.
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Early one October you go to a pumpkin patch to select your Halloween pumpkin. Calculate the work you do on the pumpkin as you lift it from the ground
A stone of mass 3 kg is thrown at an angle of 20o below the horizontal with speed 30m/sec from the edge of a cliff that is 4.0 m high. How far does the stone land horizontally from the bottom of the cliff?
Two identical batteries of emf ε = 5.07 V and internalresistance r = 0.208 Ω are to be connectedto an external resistance R, either in parallel (Fig.27-52) or in series (Fig. 27-53). If R = 0.467Ω, what is the current i (in A) in the external resi..
an electron emitted by a heated cathode and accelerated through a potential difference of 2.0 kv enters a region with
A communications satellite with a mass of 325 kilogram is in a circular orbit about the Earth. Find the weight of the satellite on the surface of the Earth
Cars A and B are traveling around the circular race track. At the instant shown, A has a speed of 78ft/s, Determine the relative acceleration of car A with respect to car B at this instant
A pump is used to send oil (density 800 kg/s) through a hose the diameter of which is 5 times that of the nozzle through which the water exits. what is the gauge pressure of the oil in the pump
A 100kg hollow sphere is neutrally buoyant and completely underwater. It's volume is 0.5 cubic meters. If this 0.5 cubic meter space is filled with a combination of helium and water, what fraction of this volume is helium?
A screen with a double-slit with a slit separation of 0.03 mm is illuminated by light of a wavelength 600nm. What is the distance from the slit to the screen in meters
a particle of mass 6kg traveling with speed 4m/s in the direction 30 degrees S of W on a horizontal plane suddenly shoots one-third its mass in the north direction with speed 5.5 m/s
An object with a mass of 2 kg is moving along a horizontal surface with velocity components vx=4 m/s and vy= ?3.5 m/s. What is the objects speed
a 15 enriched 235u-graphite moderated reactor has been operating at equilibrium for some time. the average neutron flux
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