Which of the following best describes why scientists seek to identify even small asteroids that could potentially hit Earth?
A) to try to prevent an impact that might destroy a town or city
B) to try to prevent an impact that might cause the extinction of the human race
C) to help us understand the origin of the solar system
D) to allow us to capture the asteroids and use them for their resources
A) to try to prevent an impact that might destroy a town or city
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Resistivity and Temperature: A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ? at 20°C and increases to 3.072 ? as indium just starts to melt. What is the melting point of indium? The temperature coefficient of resistivity for platinum is 3.927 × 10-3/C°.
A. 116°C B. 136°C C. 156°C D. 351°C
A 6.0-?F capacitor is connected in series with a 5.0 M? resistor, and this combination is connected across an ideal 15-V DC battery. What is the current in the circuit when the capacitor has reached 20% of its maximum charge?
A) 6.5 ?A B) 2.4 ?A C) 1.3 ?A D) 4.7 ?A E) 9.1 ?A
Is it physically possible [even though it might be impractical to actually carry out] to drive a ship across the ocean by using the thermal energy in the surface waters of the ocean? That is, could this be done without violating any principle of physics?
A) No, because there is no thermal energy in the ocean. B) No, because this process would violate the second law of thermodynamics. C) Yes, by exhausting the unused thermal energy into the stratosphere or into the deep ocean, where the temperature is cooler than that of the ocean's surface. D) Yes, by exhausting the unused thermal energy into Earth's lower atmosphere, where the temperature is warmer than that of the ocean's surface. E) No, because this process would violate the law of conservation of energy.
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?
Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction? A) 54.7° B) 90.0° C) 107° D) 73.2° E) 0.00°