Which of the following best describes the structure of an atom?
A. A positively charged nucleus circled by widely spaced negatively charged particles
B. A neutral nucleus circled by particles with positive and negative charges
C. A nucleus that is mostly empty space with charged particles circling around it
Ans: C. A nucleus that is mostly empty space with charged particles circling around it
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Rotational Kinetic Energy: While spinning down from 500 rpm to rest, a flywheel does 3.9 kJ of work. This flywheel is in the shape of a solid uniform disk of radius 1.2 m. What is the mass of this flywheel?
A. 4.0 kg B. 3.4 kg C. 4.6 kg D. 5.2 kg
Simple harmonic motion
A. occurs when there are no forces on the system B. requires a constant force C. requires a force which is not constant, but varies directly with position D. requires a force which is not constant, but varies inversely with position
Which of the following has your "cosmic address" in the correct order?
A) you, Earth, solar system, Local Group, Local Supercluster, Milky Way Galaxy, universe B) you, Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe C) you, Earth, Local Group, Local Supercluster, solar system, Milky Way Galaxy, universe D) you, Earth, solar system, Local Group, Milky Way Galaxy, Local Supercluster, universe E) you, Earth, Milky Way Galaxy, solar system, Local Group, Local Supercluster, universe
Originally 2.00 mol of gas are at standard temperature and pressure If the temperature changes to 47.0°C and the pressure decreases to half of what it was, how many liters do the two moles now occupy? (1 atm = 101 kPa, R = 8.31 J/mol ? K)
What will be an ideal response?