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Percentage decrease. On Monday, September 10, 2001 (the day before the September 11 attacks), the NASDAQ stock index closed the day at 1695. By the end of Monday, September 17, 2001 (the first full day of trading after the attacks), the NASDAQ stock index had dropped to 1580. By what percentage did the index drop?
A 25C capacitor is charged to a potential of 18V. (a) How much charge is stored on the capacitor? (b) The potential is then changed so that the charge becomes 5.9x10-4C. What is the change in potential?
A 8.7 kg freight car is coasting at a speed of 38.8 m/s along a straight track when it strikes a 13.5 kg stationary freight car and couples to it. What will be their combined speed after impact
a proton is released from rest in a uniform electric field of magnitude 385 nc. find a the electric force on the
A hydrogen atom in a state having a binding energy (the energy necessary to remove an electron) of 0.378 eV makes a transition to a state by an excitation energy (the difference among the energy of the state and that of the ground state) of 13.056 eV..
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 46.0 cm. What is the value of the acceleration of gravity on this planet
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. Estimate the length of the lake
A power line carrying 275 A current in a straight southward direction is 23 m above the ground. What is the magnitude and direction of the magnetic field caused by the current, at ground level directly below the wire
A rolling ball moves from x1 = 8.7 cm to x2 = -4.0 cm during the time from t1 = 3.1 s to t2 = 6.5 s. What is its average velocity
a what are the period and speed of a person on a carousel if the person has an acceleration with a magnitude of 0.74
A proton is confined to a nucleus that has a diameter of 5.7 10-15 m. what is the minimum uncertainty in its momentum
A 2.25 mol sample of an ideal monatomic gas undergoes the reversible process, What is the change in the internal energy of the gas
a spherical drop of water carrying a charge of 31 pc has a potential of 530 v at its surface with v 0 at infinity.a
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