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A lamp hangs vertically from a cord in a descending elevator that decelerates at 3.2 m/s2.
(a) If the tension in the cord is 84 Newton, find what is the lamp mass?
kg (b) Find the cords tension when the elevator ascends with an upward acceleration of 3.2 m/s2?
N
What was the arrow's initial speed. A small sphere with a mass of 2.00×10^-3g and carrying the charge of 4.80×10^-8C hangs from a thread near a very large, charged insulating sheet. The charge density on the sheet is -2.90×10^-9C/m^2 .
You are playing golf with a friend on a scenic course in the Rocky Mountains near Denver. When your friend misses an easy putt, How big was the force
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What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 51 rpm (revolutions per minute) if the wheel's diameter is 37 cm
A 0.60 kg stone attached to a string is whirled in a horizontal circle of radius 43 cm as in the figure below. The string makes an angle of 35° with the vertical. Find the speed of the stone
a salesman can contact either one or two customers per day with probability 13 and 23 respectively. each contact will
A copper wire of radius a = 0.331 mm has an aluminumjacket of outer radius b = 0.459 mm. There is a currenti = 2.23 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 x 10-8Ω·m and2.75 x 10-8Ω·m.
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