At t = 0, a flywheel has an angular velocity of 4.7 rad/s, a constant angular acceleration of −0.25 rad/s 2 , and a reference line at θ 0 = 0. (a) Through what maximum angle θ max will the reference line turn in the positive direction? What are the (b) first and (c) second times the reference line will be at θ = 1 2 θ max ? At what (d) negative time and (e) positive time will the reference line be at θ = 10.5 rad? (f) Graph θ versus t , and indicate your answers.
At t = 0, a flywheel has an angular velocity of 4.7 rad/s, a constant angular acceleration of −0.25 rad/s 2 , and a reference line at θ 0 = 0. (a) Through what maximum angle θ max will the reference line turn in the positive direction? What are the (b) first and (c) second times the reference line will be at θ = 1 2 θ max ? At what (d) negative time and (e) positive time will the reference line be at θ = 10.5 rad? (f) Graph θ versus t , and indicate your answers.
At t = 0, a flywheel has an angular velocity of 4.7 rad/s, a constant angular acceleration of −0.25 rad/s2, and a reference line at θ0 = 0. (a) Through what maximum angle θmax will the reference line turn in the positive direction? What are the (b) first and (c) second times the reference line will be at
θ
=
1
2
θ
max
? At what (d) negative time and (e) positive time will the reference line be at θ = 10.5 rad? (f) Graph θ versus t, and indicate your answers.
Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .
Identical rays of light enter three transparent blocks composed of
different materials. Light slows down upon entering the blocks.
For single-slit diffraction, calculate the first three values of (the total phase difference between rays from each
edge of the slit) that produce subsidiary maxima by a) using the phasor model, b) setting dr = 0, where I is
given by,
I
=
Io (sin (10) ².
2
A capacitor with a capacitance of C = 5.95×10−5 F is charged by connecting it to a 12.5 −V battery. The capacitor is then disconnected from the battery and connected across an inductor with an inductance of L = 1.55 H .
(D)What is the charge on the capacitor 0.0235 s after the connection to the inductor is made? Interpret the sign of your answer. (e) At the time given in part (d), what is the current in the inductor? Interpret the sign of your answer. (f) Atthe time given in part (d), how much electrical energy is stored in the capacitor and how much is stored in the inductor?
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