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A singly ionized helium atom (He+) has only one electron in orbit about the nucleus. What is the radius of the ion when it is in the excited state defined with n=4?
Mary is driving her car at 48 km/h. She approaches an intersection just as the traffic light turns yellow. The yellow light lasts only 3.0 s before turning to red, and she is 30 m away from the near side of the intersection.
a horizontal wire that is 4.4 m long is exposed to a uniform external magnetic field of magnitude 79 mt millitesla. the
the san vicente reservoir north of san diego currently has a residence time for water of approximately 14 days. the
A solid sphere has a temperature of 527 K. The sphere is melted down and recast into a cube that has the same emissivity and emits the same radiant power as the sphere. What is the cube's temperature in kelvins?
Two canoes are tied together and traveling down a straight river with the current. Spotting a waterfall, What is the combined mass of this canoe and rider
An ice block is pushed horizontally on a frictionless surface with initial velocity v0. At some point, it comes to the nearly semicircular bump with a radius R=0.42m and the height h=0.33m above the ground.
An ambulance with a siren emitting a whine at 1500 Hz overtakes and passes a cyclist pedaling a bike at 2.44 m/s. How fast is the ambulance moving
A velocity selector has a magnetic field of magnitude 0.32 T perpendicular to an electric field of magnitude of 0.34 MV/m. What must be the speed of a particle for it to pass through undeflected
A 200-N beam is held horizontally by a vertical steel cable at each end. The beam is 18 m long. A 650-N box sits 3.0 m from the left end. What is the tension in the right cable
for your science fair project you need to design a diffraction grating that will disperse the visible spectrum 400-700
in fresh water, sound travel at a speed of 1460m/s in the cold air sound travel in speed of 331m/s. how far is he from the site of the explosion
A system consists of three particles, each of mass 5.85 g, located at the corners of an equilateral triangle with sides of length 18.0 cm. What is the potential energy of the system?
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