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Chapter 1: 19 (page 28)
How many times does a typical person blink her eyes in a lifetime?
A person blinks 672768000 times in a lifetime
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One of the brightest comets of the 20th century was Comet Hyakutake, which passed close to the sun in early 1996. The orbital period of this comet is estimated to be about 30,000 years. Find the semi-major axis of this comet鈥檚 orbit. Compare it to the average sun鈥揚luto distance and to the distance to Alpha Centauri, the nearest star to the sun, which is 4.3 light-years distant.
A car travels in the +x-direction on a straight and level road. For the first 4.00 s of its motion, the average velocity of the car is . How far does the car travel in 4.00 s?
Question-. (a) Does it make sense to say that a vector is negative? Why? (b) Does it make sense to say that one vector is the negative of another? Why? Does your answer here contradict what you said in part (a)?
Four astronauts are in a spherical space station. (a) If, as is typical, each of them breathes about 500 cm3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year? (b) What would the diameter (in meters) of the space station have to be to contain all this air?
Starting from the front door of a ranch house, you walk 60.0 m due east to a windmill, turn around, and then slowly walk 40.0 m west to a bench, where you sit and watch the sunrise. It takes you 28.0 s to walk from the house to the windmill and then 36.0 s to walk from the windmill to the bench. For the entire trip from the front door to the bench, what are your (a) average velocity and (b) average speed?
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