A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed
(a) What is the average angular acceleration of the centrifuge as it spins up? (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?
(a) 18.8 rad/s2
(b) 1.49 × 104 revolutions
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The surface gravity of Mars is 3.7 m/s2. If a person with mass of 100 kg were parachuting on Mars, what would be the force exerted by air resistance at terminal velocity?
A. 100 N B. 370 N C. 490 N D. 980 N
A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = -2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
a. 3.2 ILB b. 5.0 ILB c. 4.2 ILB d. 3.6 ILB e. 1.0 ILB
Which of the outer planets has rings?
A. Neptune B. Uranus C. Saturn D. Jupiter E. All of the outer planets have a ring system.
A copper cylinder with a mass of 125 g and temperature of 345°C is cooled by dropping it into a glass beaker containing 565 g of water initially at 20.0°C
The mass of the beaker is 50.0 g and the specific heat of the glass is 840 J/kg?K. What is the final equilibrium temperature of the system, assuming the cooling takes place very quickly, so that no energy is lost to the air? The specific heat of copper is 385 J/kg?K and that of water is 4190 J/kg?K.