A watermelon is a good example of
a. a compound.
b. an element.
c. a homogeneous mixture.
d. a heterogeneous mixture.
d
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Which of the following is a general difference between a planet and a star?
A) Stars shine with energy released by nuclear fusion while planets shine primarily with light reflected from stars. B) Stars are found in galaxies, but planets are not part of galaxies. C) Stars are made of gas and planets are made of rock. D) Stars are stationary while planets orbit stars.
Elastic Collisions: A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
A. 0.678 m/s B. 0.106 m/s C. 1.36 m/s D. 1.14 m/s E. 2.72 m/s
What is the stored energy in a 1.5-mH coil carrying a current of 4.0 A?
a. 12 × 10^-3 J c. 8.0 × 10^-3 J b. 4.0 × 10^-3 J d. 2.0 × 10^-3 J
When an atom's electrons fall down to lower energy levels in a thin cloud of hot gas, what is produced?
A) thermal radiation B) an absorption line spectrum C) an emission line spectrum D) an infrared spectrum E) new interstellar compounds