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Physics, 23.06.2019 08:00
Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force
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Physics, 23.06.2019 23:50
The radius of a solid sphere is measured to be (6.25 ± 0.28) cm, and its mass is measured to be (1.77 ± 0.07) kg. determine the density of the sphere in kilograms per cubic meter and the uncertainty in the density. (use the correct number of significant figures. use the following formula to calculate the uncertainty in the density:
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