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Consider an elevator that is hanging from a strong cable. The elevator is initially at rest. It then accelerates upwards for 2 seconds, due to the cable pulling. It then then slows down, still moving upwards, until it comes to a stop. Pick out any and all answers that are correct: Compared to the weight of the elevator, the tension in the cable is
A) the same as the weight during the entire motion, due to Newton's third law
B) less than the weight while it is slowing down.
C) less than weight while it is speeding up
D) greater than the weight while speeding up
E) always greater than the weight during the whole time, or the elevator would not have been able to move up at all.
A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10-8 ? ? m. at what rate is heat generated in the rod
A parallel-plate capacitor has circular plates of 10.4 cm radius and 1.67 mm separation. Calculate the capacitance in picofarads
The moon orbits the earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the earth, Find the period for the moon's motion around the earth
A very long straight wire carries current 44 A. In the middle of the wire a right-angle bend is made. Determine the magnetic field at the center of the arc
Two charged dust particles exert a force of 4.30×10-2 N on each other. What would be the force if they are moved so they are only one-sixth as far apart.
A sinusoidal voltage ?v = (65 V) sin (140t) is applied to a series RLC circuit with L = 50 mH, C = 150 ?F, and R = 42 ?.
A point source of light illuminates an aperture 1.90 away. A 11.5 -wide bright patch of light appears on a screen 1.40 behind the aperture. How wide is the aperture
You shine a laser on a plastic prism made from an unknown material and measure the angles relative to the normal that the light takes both inside and outside the medium. What is the index of refraction of the plastic object
A generator has a 170-turn square coil, 4cm on a side. Find the peak emf in this coil when it's rotating at 95.0Hz in a strong 6.1T field
What is the speed of the arrow as it leaves the bow.Two point charges, Q_1 = -6.9 mu C and Q_2 = 2.0 mu C are located between 2 oppositely charged parallel plates.
Earth's radius is 6.37 106 m. Illustrate by what percent does the Moon's gravitational pull on you increase?
Two men decide to use their cars to pull a truck stuck in mud. What is the net forward force exerted on the truck in the direction it is headed
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