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A 50 kg person stands at the edge of a 7.4 m diameter circular platform, which is mounted horizontally on frictionless bearings and has a total mass of 300 kg. The platform is at rest initially, but when the person begins running at a speed of 10 m/s (with respect to the platform) around its edge, the platform begins to rotate in the opposite direction. What is the magnitude of the speed of the person (in m/s) with respect to the ground? You can model the platform as a circular disk.
Three charges are at rest on the z axis: q1 = ?7.21 mC at z = 4.58 m, q2 = ?1.79 mC at z = 0 m, What is the potential energy of this system
A rocket that is in deep space and initially at rest relative to an inertial reference frame has a mass of 2.80 105 kg, of which 1.92 105 kg is fuel. What is the rocket's thrust
A dolphin located in sea water at a temperature of 25°C emits a sound directed toward the bottom of the ocean 105 m below
A superhero flies 272m from the top of a tall building at an angle of 32 below the horizontal. What is the vertical component of the superhero's displacement.
Lillian (mass 32.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 2.0 m/s. Evaluate what is the speed of Lillian and her dog after the catch?
The largest and smallest slits in these experiments are 0.16mm and 0.04mm wide, respectively. How many wavelengths wide are these slits
Nitrogen gas is heated by a pulsed laser to 50 000 K. If the diameter of the nitrogen atoms is assumed to be 1.0 ´ 10-10 m, what is the mean free path
A very long solenoid with a circular cross section and radius r= 8.1cm with n= 1.90E+4 turns/m has a magnetic energy density uB= 5.70 mJ/m3. What is the current in solenoid.
Near the surface of the Earth a block of mass M is sliding down an incline with angle µ1 = 30degrees. what maximum height H will the block reach
A 0.252-kg volleyball approaches a player horizontally with a speed of 15.3 m/s. What impulse is delivered to the ball by the player
Light in vacuum is incident on the surface of a glass slab. In the vacuum the beam makes an angle of 41.5° with the normal to the surface, What is the index of refraction of the glass
A standing wave in a pipe with both ends open has a frequency of 206. Hz. The next higher harmonic has a frequency of 309. Hz. How long is the pipe
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