1. A rotating machine starts at 1.7 revolution and an initial angular speed of 4.5 revolutions per second and accelerates at 2.53 revolutions/s2 for 0.5 seconds. What is the ending angle in revolutions at the end of this time?
2. A DJ speeds up a turntable uniformly from 13.0 rpm to 93.1 rpm. In doing so, the turntable goes through 34.1 revolutions. What is the angular acceleration of the table in revolutions per minute per minute (rpm2)?
3. A washing machine spin-dries clothes. It starts spinning at 932 deg/s and slows down to 221 deg/s while turning through 908.7 degrees. How long does this take in seconds?
4. A CD player spins at 296 rps --. If it starts from rest and has an acceleration of 3.97 rad/s^2, how long does it take to reach full speed, answer in seconds?
5. A rotating machine has an initial angular speed of 18.3 rad/s decelerates (negative folks) uniformly at a rate of -9.2 rad/s2 for 5.0 seconds. How fast is the object rotating in rad/sec after 5.1 seconds?
Answers: 1
Physics, 22.06.2019 14:30
Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules
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Physics, 22.06.2019 18:30
Which word expression describes how much to calculate pressure
Answers: 1
Physics, 22.06.2019 19:50
The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.
Answers: 3
1. A rotating machine starts at 1.7 revolution and an initial angular speed of 4.5 revolutions per s...
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