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Q. A strong lightning bolt transfers and electric charge of about 11 C to Earth (or visa versa). How many electrons are transferred? Avogadro's number is 6.02214E23/mol.
Q. What is the smallest thickness of a soap film that would appear black if illuminated with 490 light? Assume there is air on both sides of the soap film.
Two spherical objects have a combined mass of 200. The gravitational attraction between them is 8.01×10-6 while their centers are 21.0 apart.
A 52.0 skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 2.90. What speed does he need at the bottom.
A bat flying in a cave emits a sound and receives its echo 0.37s later. How far away is the cave wall? (Hint: The sound has to travel to the wall and then back again. Use 340 m/s for the speed of sound.)
Find the average magnitude of the induced emf if the change. The magnitude of the charge on a parallel plate capacitor is 4uC and the potential difference between the plates is 80V. What is the capacitance of this capacitor.
A 5 kg fish is swimming at a speed of 1ms swallows a 1.00 kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is what.
Two ocean liners, each with a mass of 38,000 metric tons, are moving on parallel courses, 92 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Treat the ships as par..
A block of mass M is held motionless on a frictionless inclined plane by means of a string attached to a vertical wall as shown in the diagram.what is the magnitude of the tension t in string.
A continuous line of charge lies along an x axis, extending from x = +x0 to positive infinity. The line carries charge with the uniform linear charge density λ0. What are the magnitude and direction of the electric field at the origin.
describe free-body diagram for the mass. Calculate the tension in each part of the rope.
A bug crawls outward from the center of a compact disc spinning at 160 revolutions per minute. The coefficient of static friction between bug's sticky feet and disc surface is 1.10.How far does the bug get from the center before slipping.
Basic science concepts in optics like Which types of electromagnetic radiation can be seen from the surface of Earth.
A disc of mass M and radius R is rolling purely without slipping with velocity V on a flat horizontal floor. When it hits a step in the floor of height R/2.what is the velocity of the center of mass of the disc just after impact.
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