Physics, 17.01.2020 21:31, F00Dislife
Ametal tool is sharpened by being held against the rim of a wheel on a grinding machine by a force of 180 n. the frictional forces between the rim and the tool grind off small pieces of the tool. the wheel has a radius of 20.0 cm and rotates at 2.50 rev/s. the coefficient of kinetic friction between the wheel and the tool is 0.320. at what rate is energy being transferred from the motor driving the wheel to the thermal energy of the wheel and tool and to the kinetic energy of the material thrown from the tool?
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In positive numbers less than 1, the zeros between the decimal point and non zero are significant
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The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)
Answers: 3
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