A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s
b. 4.0 s
c. 3.5 s
d. 3.0 s
e. 4.5 s
D
You might also like to view...
A physicist claims that she has found a new particle with a mass 200,000 times the mass of the proton (1.67 × 10?27 kg) and a charge of 3.20 × 10?19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00-T magnetic field at a velocity of 2 500 m/s will have a radius of
A. 0.261 m. B. 0.522 m. C. 1.04 m. D. 3.27 m. E. 3.13 × 1026 m.
A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward at constant velocity. The speed of the ball as seen by a stationary observer in the street:
a. is less than that observed inside the bus. b. is the same as that observed inside the bus. c. is greater than that observed inside the bus. d. may be either greater or smaller than that observed inside the bus. e. may be either greater, smaller, or equal to that observed inside the bus.
Polypropylene has _________strength at elevated temperatures than PE does.
Fill in the blank(s) with the appropriate word(s).
Stars spend about 90% of their lifetime on the main sequence
Indicate whether the statement is true or false