How many moles are there in 2.0 kg of copper? (The atomic weight of copper is 63.5 and its specific gravity is 8.9.)
What will be an ideal response?
32. moles
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Which of the following statements does not lend support to the idea that carbon dioxide is a cause of global warming?
A) Models of the greenhouse effect successfully predict the actual temperatures of Mars and Venus from their atmospheric carbon dioxide amounts. B) Models of Earth's climate that include recent increases in carbon dioxide concentration match the observed temperature increases better than those that do not include it. C) We understand the physical mechanism of the greenhouse effect, by which carbon dioxide increases cause an increase in the planet's temperature. D) Isotope ratios in atmospheric carbon dioxide show that much of the carbon dioxide in Earth's atmosphere today comes from the burning of fossil fuels.
In a flowing fluid, the pressure where the fluid is moving slower is higher than the pressure where the fluid is moving faster
a. True b. False Indicate whether the statement is true or false
What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 × 10-27 kg)
A) 1.70 × 10-12 kg B) 5.38 × 10-19 kg C) 3.84 × 10-20 kg D) 8.68 × 10-13 kg
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 31 N b. 36 N c. 41 N d. 46 N e. 23 N