For an object in uniform circular motion, the acceleration points toward ______________
Fill in the blank(s) with correct word
the center of the circle
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Using the ideas discussed in your text, in what sense are we "star stuff"?
A) The overall chemical composition of our bodies is about the same as that of stars. B) Movie stars and other people are all made of the same stuff, so we all have the potential to be famous. C) Nearly every atom from which we are made was once inside of a star. D) We could not survive without light from our star, the Sun.
A train station bell gives off a fundamental tone of 500 Hz as the train approaches the station at a speed of 30.0 m/s. If the speed of sound in air is 339 m/s, what will be the apparent frequency of the bell to an observer riding the train?
a. 456 Hz b. 544 Hz c. 250 Hz d. 530 Hz e. 339 Hz
The extended sheet of galaxies that spans 70 Mpc × 200 Mpc and includes about 24,000 galaxies is called the ________
Fill in the blank(s) with correct word
How much heat is needed to raise the temperature of 200 g of lead (c = 0.11 kcal/kg ? °C) by 10 C°?
A) 33.0 cal B) 330 cal C) 2000 cal D) 20 kcal