The center of mass for Earth orbiting the Sun lies inside the Sun
Indicate whether the statement is true or false
TRUE
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Why do elements fuse only in a star's core?
A. Only the core spins fast enough. B. The fuel settles to the core. C. Only the core is hot enough for fusion. D. The statement is incorrect. Fusion occurs just below the surface. E. None of these choices is correct.
A steel rod (Es 5 210 GPa, dr 5 12 mm, ctes 5 12 3 1026/°C) is held stress-free between rigid walls by a clevis and pin (dp 5 15 mm) assembly at each end. If the allowable shear stress in the pin is 45 MPa and the allowable normal stress in the rod is 70 MPa, the maximum permissible temperature drop DT is approximately:
(A) 14 8C
(B) 20 8C
(C) 28 8C
(D) 40 8C
In a supermarket, you place a 22.3-N (around 5 lb) bag of oranges on a scale, and the scale starts to oscillate at 2.7 Hz. What is the force constant (spring constant) of the spring of the scale?
A) 650 N/m B) 600 N/m C) 330 N/m D) 820 N/m E) 410 N/m
The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?
a. first c. third b. second d. fourth