How many moles of water (H2O) molecules are in a 4.00 m3 container at a pressure 8.00 × 105 N/m2 and temperature 600°C? The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K
A) 641 mol
B) 7.72 × 1026 mol
C) 2.65 × 1026 mol
D) 3.86 × 1026 mol
E) 441 mol
E
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Resistivity and Temperature: A tungsten wire is 1.50 m long and has a diameter of 1.00 mm. At 20°C a current of 50 mA flows through this wire. The temperature coefficient of resistivity for this tungsten is 4.5 × 10-3/C°, and its resistivity at 20°C is 5.6 × 10-8 ? ? m.(a) What is the potential difference across the ends of this wire at 20°C?(b) If the wire temperature increases by 100°C, what potential difference across its ends is now required to produce a current of 50 mA?
What will be an ideal response?
If the density of the universe is greater than critical, then
A) the universe will end up as nothing but black holes. B) the universe will continue expanding forever. C) there is more matter than energy. D) the universe is closed, gravity wins, and will shrink to the Big Crunch. E) the universe is flat, and Euclid is right.
A charge of uniform density (0.80 nC/m) is distributed along the x axis from the origin to the point x = 10 cm. What is the electric potential (relative to zero at infinity) at a point, x = 18 cm, on the x axis?
a. 7.1 V b. 5.8 V c. 9.0 V d. 13 V e. 16 V
A pendulum clock on the surface of the earth has a period of 1.00 s. On a distant planet, the length of the pendulum must be shortened slightly to have a period of 1.00 s
What is true about the acceleration of gravity on the distant planet? A) The gravitational acceleration of the planet is 0. B) The gravitational acceleration of the planet is slightly greater than g. C) The gravitational acceleration of the planet is slightly less than g. D) There is no gravitational acceleration on the planet. E) The gravitational acceleration of the planet is equal to g.