What is the effect of adding some boron on how easily a silicon crystal conducts electricity?
A. The crystal becomes more conductive.
B. The crystal becomes less conductive.
C. The boron creates new energy levels for electrons but does not change the crystal’s conductivity.
A. The crystal becomes more conductive.
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To be more efficient, the temperature difference should be
A as small as possible B. as large as possible C. It doesn't matter.
A star's emission line of 656 nm appears shifted to 649 nm in the spectrum. What can you conclude from this shift?
A. The star is receding from you with the speed of 3,200 km/s. B. The star is approaching you with the speed of 320,000 km/s. C. The star is approaching you with the speed of 3,200 km/s. D. The star is receding from you with the speed of 320,000 km/s.
Springs: A very light ideal spring with a spring constant (force constant) of 2.5 N/cm pulls horizontally on an 18-kg box that is resting on a horizontal floor. The coefficient of static friction between the box and the floor is 0.65, and the coefficient of kinetic friction is 0.45.(a) How long is the spring just as the box is ready to move?(b) If the spring pulls the box along with a constant forward velocity of 1.75 m/s, how long is the spring?(c) How long is the spring if it pulls the box forward at a constant 2.75 m/s?
What will be an ideal response?
An apple and an orange are connected by a straw of negligible mass. If the centers of the apples are 26 cm apart and the center of mass of the pair is 11 cm from the apple, what is the ratio of mapple to m orange?
A. 26/11 B. 11/15 C. 15/26 D. 11/26 E. 26/15 F. 15/11