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A force of 21.0 N is required to start a 2.8 kg box moving across a horizontal concrete floor.
(a) What is the coefficient of static friction between the box and the floor?
(b) If the 21.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction?
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A mass M of 1.19 kg is attached to the end of a string whose length is 0.650 m. The mass slides without friction on a horizontal surface as indicated. If the string can withstand a maximum tension of 55.5 N, what is the maximum tangential speed th..
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220 cm3 of hot tea at 89°C are poured into a very thin paper cup with 70 g of crushed ice at 0°C. Calculate the final temperature of the "ice tea"
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
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