Once a star ejects a planetary nebula, it becomes a white dwarf
a. True
b. False
Indicate whether the statement is true or false
True
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You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J
What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 0.11 nm B) 0.22 nm C) 0.15 nm D) 0.18 nm
A certain grapefruit on Earth has a mass of one kilogram and a weight of one newton. When the grapefruit is on the moon its mass is
A) less than one kilogram. B) ten newtons. C) less than ten newtons. D) one kilogram.
A jet plane travels around the world at 2000 mi/hr (894 m/s). Two accurate atomic clocks measure the times of flight, one on board the plane and the second on Earth. If it takes 12 hours to complete the journey, what will the time difference (in ?s) be?
a. 0.75 b. 0.50 c. 0.25 d. 1.0 e. 0.19
This graph shows a spacetime diagram for a car. At which of the numbered points is the car stationary?
A) Point 1 B) Point 2 C) Point 3 D) Point 4 E) both Points 2 and 4