The force of attraction due to gravity between two objects is F’. If the distance between the two objects doubles and the mass of one object triples, the new gravitational force between them will be —
A. 0.5F’
B. 0.75F’
C. 1.5F’
D. 2.5F’
Answer: B. 0.75F’
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The energy stored in a stretched spring is an example of __________ energy
Fill in the blank(s) with correct word
The iron in our solar system was created from smaller-mass atomic nuclei in
a. the Earth. b. our Sun. c. Jupiter. d. the big bang. e. supernovae.
A telescope is used to view two small lights separated by 2.0 cm at a distance of 500 m. What minimum objective lens diameter is needed to just resolve these objects if their wavelength is 656 nm?
a. 2.0 cm b. 1.0 cm c. 1.2 cm d. 2.4 cm
An electron in an infinite potential well (a box) makes a transition from the n = 3 level to the ground state and in so doing emits a photon of wavelength 20.9 nm. (c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg)
(a) What is the width of this well? (b) What wavelength photon would be required to excite the electron from its original level to the next higher one?