Constant Angular Acceleration: A bicycle wheel has an initial angular speed of 7.2 rad/s. After turning through one-half of a revolution, the angular speed is reduced to 2.2 rad/s. If the angular acceleration of the wheel was constant during the motion, how long will it take the wheel to make the one-half revolution?
Fill in the blank(s) with the appropriate word(s).
0.67 s
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When the pendulum bob shown here is at its highest point, its velocity is _________ and its acceleration is _________
a. a maximum/zero b. zero/a maximum c. zero/zero d. a maximum/a maximum
Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 × 106 m and an apogee (the furthest point from Earth's center) of 7.53 × 106 m
What was its speed when it was at its perigee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 7.18 × 103 m/s B) 7.84 × 103 m/s C) 8.23 × 103 m/s D) 11.0 × 103 m/s E) 13.4 × 103 m/s
A bulb is designed for 100 W at 130 V rms. What is the power dissipated by this bulb if it is used in a 120 V rms circuit?
A. 169 W B. 130 W C. 100 W D. 85.0 W E. it will blow out
If 1.0 m3 of concrete weighs 5 × 104 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight? (The compression strength of concrete is 1.7 × 107 N/m2.)
What will be an ideal response?