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 The wheel is run at that angular velocity for 30 s, and then power is shut off
The wheel slows down uniformly at 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
A
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Planck's constant
A) sets an upper limit to the amount of energy that can be absorbed or emitted. B) sets a lower limit to the amount of energy that can be absorbed or emitted. C) relates mass to energy. D) determines the value of the gravitational constant.
A 5.0-kg block is attached to an ideal massless spring whose spring constant is 125 N/m. The block is pulled from its equilibrium position at x = 0.00 m to a position at x = +0.687 m and is released from rest
The block then executes lightly damped oscillation along the x-axis, and the damping force is proportional to the velocity. When the block first returns to x = 0.00 m, its x component of velocity is -2.0 m/s and its x component of acceleration is +5.6 m/s2. (a) What is the magnitude of the acceleration of the block upon release at x = +0.687 m. (b) Find the damping constant b.
A supercluster is a cluster of supergiants
Indicate whether the statement is true or false
If the earth were twice as far from the sun as it presently is, how long (in terms of the present year) would it take it to make one orbit around the sun?
A) 2.0 years B) 2.8 years C) 4.0 years D) 5.7 years E) 16 years