An old 78 rpm record rotates through an angle of 320° as it slows down uniformly from 78.0 rpm to 22.8 rpm. What is the magnitude of the angular acceleration of the record?
A) 2.34 rad/s2
B) 5.46 rad/s2
C) 6.50 rad/s2
D) 8.35 rad/s2
E) 10.9 rad/s2
B
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Velocity Addition: A spaceship traveling at 0.50c away from Earth launches a secondary rocket in the forward direction at 0.50c relative to the spaceship. As measured by Earthlings, how fast is the secondary rocket moving away from Earth?
A. 0.90c B. 0.50c C. 0.80c D. 0.70c E. c
Calorimetry: A lab assistant pours 330 g of water at 45°C into an 855-g aluminum container that is at an initial temperature of 10°C. The specific heat of aluminum is 900 J/kg ? K, and that of water is 4186 J/kg ? K. What is the final temperature of the system, assuming no heat is exchanged with the surroundings?
A. 28°C B. 32°C C. 31°C D. 33°C E. 35°C
What two energy transport mechanisms, in order from outside the core to the surface, is found in the Sun?
A) Convection, conduction B) Fadiative diffusion, convection C) Conduction, radiative diffusion D) Fadiative diffusion, conduction E) Conduction, convection
Why is stratification sometimes dangerous to the fish that live in a lake?
What will be an ideal response?