Constant Angular Acceleration: A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 58 rad/s. The wheel is run at that angular velocity for 30 s, and then power is shut off. The wheel slows down uniformly at 1.4 rad/s2 until the wheel stops. What is the total number of revolutions made by the wheel in this situation?
A. 510
B. 280
C. 320
D. 470
E. 750
Answer: A
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A conical pendulum is constructed with a string 2.00 m in length. The pendulum is set in horizontal circular path the vertical axis. If the angle the string makes with the vertical axis is 45.0 degrees, then the angular velocity of the conical pendulum is
A. 4.00 rad/s. B. 3.55 rad/s. C. 3.04 rad/s. D. 2.63 rad/s. E. 2.01 rad/s.
The maximum number of electron states with a principal quantum number n = 3 is 15
Indicate whether the statement is true or false
At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10^?15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10^?25 kg.)