A wheel starting from rest reaches 20 rad/s in 4 s. Angular acceleration alpha:
A2 rad/s²
B80 rad/s²
C1 rad/s²
D5 rad/s²
Answer & Solution
Correct answer: D. 5 rad/s²
alpha = (omega - omega0)/t = (20 - 0)/4 = 5 rad/s².
Related questions
A bicycle wheel of radius $R$ rolls without slipping at linear speed $v$. The angular speeAn ice skater spinning with arms outstretched at $\omega_1$ pulls arms in, halving her momA solid disc of mass $M$, radius $R$, rotating about its centre axis has moment of inertiaA child pushes a door of width $0.8$ m perpendicular to the door at the handle with $20$ NMoment of inertia of an annular disc (inner radius r1, outer r2) about perpendicular axis For a solid cylinder rolling without slipping, the friction force at the contact point:A merry-go-round (I = 1000 kg m²) rotates at 0.5 rad/s. A 50 kg child runs and jumps onto A solid cylinder (I = MR²/2) of mass 2 kg, radius 0.1 m, rolls without slipping at 6 m/s.