Significant Figures: How many significant figures are in the number 0.0037010?
A. four
B. five
C. six
D. seven
E. eight
Answer: B
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The cosmic microwave background is
A) the faint radiation that comes from the hydrogen atoms that fill the universe. B) the now-cooled radiation that was released by the big bang. C) caused by the world's microwave ovens. D) the faint glow from the most distant galaxies. E) the now-cooled X-ray radiation emitted by very distant supernova explosions.
In a condenser of a refrigeration unit, saturated vapor R-134a flows at 0.5 m/s into a 0.5 cm diameter horizontal tube. The tube inside surface temperature is 30ºC and the R- 134a is at 80ºC. Estimate the convective heat transfer coefficient and the expected tube length required for complete condensation of the R-134a. Use hnfg of 106.3 kJ/kg, ?f of 927.6 kg/m3, ?g of 153.8 kg/m3, and cp, ?, and ? at 400C.
What will be an ideal response?
This image shows a colliding pair of galaxy clusters known together as the Bullet Cluster. The blue region represents a map of the cluster's dark matter. How was this blue map made?
A) The blue region was inferred from studies of how the cluster causes gravitational lensing of objects located behind it. B) The blue region represents X-ray emission from hot gas within the cluster. C) The blue region represents previously unknown radio emission from the dark matter. D) The blue region comes from the combined light of many young stars drawn together by the cluster's dark matter.
What force will a negative charge placed at location C feel?
a. zero b. a force up and to the left c. a force up and to the right d. a force down and to the left e. a force down and to the right