The basic function of a carburetor of an automobile is to atomize the gasoline and mix it with air to promote rapid combustion. As an example, assume that 30 cm3 of gasoline is atomized into N spherical droplets, each with a radius of 2.0 × 10?5 m. What is the total surface area of these N spherical droplets?
What will be an ideal response?
4.5 m2
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A star whose mass is 5 times larger than the Sun's and whose luminosity is 100 times larger than the Sun's has a main sequence lifetime about
A. 5 times longer than the Sun's. B. 5 times shorter than the Sun's. C. 20 times shorter than the Sun's. D. 100 times shorter than the Sun's. E. 500 times longer than the Sun's.
How does the resistance of a thick piece of copper wire compare to the resistance of a thin piece of copper wire?
A. The resistance of the thin piece is greater than that of the thick piece. B. The resistance of the thick piece is greater than that of the thin piece. C. Both the wire and narrow piece of copper provide the same resistance.
Is heat absorbed or released by ice when it melts?
Velocity Addition: A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative to the ship must the spaceship launch a shuttlecraft in the forward direction so that it will be moving away from Earth at 98.7% the speed of light?
A. 0.91c B. 0.97c C. 0.93c D. 0.99c E. 0.84c