Which of the following properties of the Sun tells us the rate at which energy is being generated in its core?
A) surface temperature
B) apparent brightness
C) mass
D) luminosity
D) luminosity
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Which of the following types of galaxies are most commonly found in large clusters?
A) spirals B) ellipticals C) lenticulars D) irregulars
That Earth ____ , evidence that Earth differentiated
a. rotates slowly b. has an average density that is higher than the density of the crust c. has a no magnetic field d. has a surface that is 75% water e. all of these
Waves on a String: Transverse waves travel at 43.2 m/s in a string that is subjected to a tension of 60.5 N. If the string is 15.9 m long, what is its mass?
A. 0.515 kg B. 0.216 kg C. 0.366 kg D. 0.597 kg
The coefficients of friction for plastic on wood are ?s = 0.50 and ?k = 0.40. How much horizontal force would you need to apply to a 3.0-lb plastic calculator to start it moving from rest?
A) 1.2 N B) 2.7 N C) 6.7 N D) 0.15 N E) 0.50 N