Over time, the star-gas-star cycle leads the gas in the Milky Way to ________
A) become denser and hotter
B) have a greater abundance of heavy elements
C) have a lower abundance of heavy elements
D) become denser and have a greater abundance of heavy elements
B
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A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2. What area must be removed from the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10?6 (°C)?1.)
A. 0.079 3 cm2 B. 0.159 cm2 C. 0.238 cm2 D. 0.836 cm2 E. 0.921 cm2
The direction in which the potential changes at the greatest rate is in the direction
A) of the gradient of the potential. B) perpendicular to the electric field. C) perpendicular to the gradient of the potential. D) of the partial derivative with respect to x. E) cannot be determined
A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
a. 5.0 mT b. 10 mT c. 0.63 mT d. 2.5 mT e. 0.01 mT
Nuclear fusion in stars is controlled by the dependence of density on mass
Indicate whether the statement is true or false