What is the zeroth law of thermodynamics?
a. Energy is always conserved in thermodynamic processes.
b. Momentum is always conserved.
c. The pressure of a fluid decreases as its velocity increases.
d. If two objects are in thermal equilibrium with a third object, they are in thermal equilibrium with each other.
e. If a = c and b = c, then a = b.
d
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The term "cosmic distance ladder" refers to the fact(s) that:
Select the ones that apply: a. change in apparent position of object on sky through Earths orbit, which gives a measure of distance. (p=1/D) b. Spectral classification of star, which gives luminosity.D*=Sq rt L/4pieB c. variable stars whose luminosity is related to their period.D*=Sq rt L/4pieB d. relation between a galaxy's rotation rate and luminosity. D*=Sq Rt Lg/4pieBg e. Exploding star whose luminosity can be determined by its light curve. Dg=SqRt Lsn/4pieBsn f. Relation between galaxies recession velocity and distance.D=V/H g. All of the above facts.
Two thin-walled concentric conducting spheres of radii 5.0 cm and 10 cm have a potential difference of 100 V between them. (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
(a) What is the capacitance of this combination? (b) What is the charge carried by each sphere? What will be an ideal response?
What similarity did Isaac Newton perceive between a falling apple and the moon?
A) The velocities of both are directed toward Earth's center. B) Both have a velocities and accelerations directed toward Earth's center. C) Both have accelerations directed toward Earth's center, although the forces on them are in different directions. D) Both have forces on them toward Earth's center, and accelerations directed toward Earth's center. E) Both have forces on them toward Earth's center, but their accelerations are in different directions.
A gas is quickly compressed in an isolated environment. During the event, the gas exchanged no heat with its surroundings. This process is
A) isothermal. B) isochoric. C) isobaric. D) adiabatic. E) idealistic.