In Carol's (and Kaku's) theory of eternal inflation
A) astronomers can never buy much with the money they earn
B) our universe undergoes extremely fast expansion forever
C) many baby universes form, most of which are dead, but some which are similar to ours
D) the universe has 35 different dimensions which we can access through black holes
E) the universe continues to expand at a constant rate from the time of the Big Bang until the present
Ans: C) many baby universes form, most of which are dead, but some which are similar to ours
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Ideal Gas Law: A 3.9-L volume of ideal neon gas (monatomic) is at a pressure of 5.6 aym and a temperature of 330 K. The atomic mass of neon is 20.2 g/mol. The temperature of the gas is now increased to 430 K and the volume is increased to 5.9 L. What is the final pressure of the gas?
A. 4.8 atm B. 4.3 atm C. 5.3 atm D. 5.8 atm E. 6.3 atm
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?
A heavy bus bar is 20. cm long and of rectangular cross-section, 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries 4000. A? (The resistivity of copper is 1.69 × 10-8 ?-m.)
What will be an ideal response?
The number of cycles of a periodic process that occur per unit time is called the __________
Fill in the blank(s) with correct word