Cart A with momentum p (in magnitude) collides with cart B at rest and rebounds. What can you say about the momentum of cart B after the collision?
3
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Why is Mars' greenhouse effect negligible compared to that of Earth's?
A) Its mass is only one-ninth of Earth's. B) Greenhouse gas emissions were greatly curtailed according to the International Mars Greenhouse Gas Reduction Treaty of 2003. C) The Martian atmosphere is much thinner and retains little heat. D) Martian carbon dioxide contains a rare isotope with little ability to trap heat.
The warmer brown dwarfs fall in spectral class _____
A) O B) A C) L D) T
A Venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (? = 1.2 kg/m3.)
a. 70 Pa b. 85 Pa c. 100 Pa d. 120 Pa e. 81 Pa
Thermodynamic Processes: Two processes are shown on the pV diagram in the figure. One of them is an adiabat and the other one is an isotherm. Which process is the isotherm?
A. process A B. process B C. The processes shown are neither isotherms nor adiabats. D. It is not possible to tell without knowing if the gas is monatomic or diatomic.