Which of the following stars will certainly end its life in a supernova?
A) the Sun
B) a red giant star
C) a 10-solar-mass star
D) a neutron star
C
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Energy Conservation With Conservative Forces: Two identical grasshoppers jump into the air with the same initial speed and experience no air resistance. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal. Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.)
A. At their highest point, both of them have the same amount of gravitational potential energy. B. At their highest point, both of them have the same amount of kinetic energy. C. At their highest point, both of them have the same amount of mechanical energy. D. At their highest point, grasshopper B is moving faster than grasshopper A. E. At their highest point, grasshopper A has more gravitational potential energy than grasshopper B.
Spherical Mirrors: Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)
A. The image of the object will always be smaller than the object. B. No matter where you place the object, a real image of the object will be formed. C. The image of the object will always be inverted. D. If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. E. No matter where you place the object, the image of the object will always be virtual and upright.
The earliest Homo sapiens appeared about
A) 25 million years ago B) 6 to 7 million years ago C) 200,000 years ago D) 545 million years ago
Calculate the ground state energy (in eV) for an electron in a box (an infinite well) having a width of 0.050 nm
a. 10 b. 75 c. 24 d. 150 e. 54