The force due to gravity between two objects depends on I. the mass of each object. II. the distance each object is from Earth. III. the distance between the two objects. IV. the speed of light
a. I & II
b. I & III
c. II & IV
d. I, II, & III
e. I, II, III, & IV
B
Physics & Space Science
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The helium flash is the cause of some supernovae
Indicate whether the statement is true or false
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Most of the elements heavier than helium were made during the first few minutes after the big bang
a. True b. False Indicate whether the statement is true or false
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A steel bar of rectangular cross section (a 5 38 mm, b 5 50 mm) carries a tensile load P. The allowable stresses in tension and shear are 100 MPa and 48 MPa, respectively. The maximum permissible load Pmax is approximately:
(A) 56 kN
(B) 62 kN
(C) 74 kN
(D) 91 kN
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The strongest lines present in spectral class A stars are absorption lines of
A) complex molecules. B) hydrogen. C) oxygen. D) iron. E) helium.
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