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A proton is released from rest at the positive plate of a parallel-plate capacitor. It crosses the capacitor and reaches the negative plate with a speed of 50,000m/s. The experiment is repeated with a He ion (charge e, mass 4u). What is the ion's speed at the negative plate?
A movie camera with a (single) lens of focal length 70 mm takes a picture of a person standing 28 m away. what is the height of the image in millimeters on the film
A referee's whistle operates at 800Hz. What is the frequency you hear when she is running toward you on the court at 5 m/s
Consider four 8 · µC charges placed at the corners of a square, which is 2.1 ·m on a side. The charges on the top are both positive, Find the electric field at the center of the square
A 890-Hzsounds travels through pure hydrogen. The wavelength of the sound is measured to be 1.44 m, What is the speed of sound in hydrogen
The mass of a string is 1.00 10-3 kg, and it is stretched so the tension in it is 120 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string?
Two wheels can rotate freely about fixed axles through their centers. The wheels have the same mass, but one has twice the radius of the other. Compare the magnitudes of the two forces
What is the tangential acceleration of a bug on the rim of an 11.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 76.0 rev/min in 3.80 s
An electron traveling 10^7 m/s to the right enters a constant electric field that slows it to rest. a.)what is the potential different that the electron travels through as it slows down? b.)if the electron travels 0.1 meters before coming to a stop, ..
river pascal with a volume flow rate of 5.8times105 joins with river archimedes which carries 1.14times106 to form the
Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of ei..
a child is in danger of drowning in the merimac river. the merimac river has a current of 3.4 kmhr to the east. the
A planet moves in a circle around a massive star. If the planet is 7.2 x 1010 m from the star, What is the mass of the star
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