Cepheid variable stars are more luminous than the sun
Indicate whether the statement is true or false
T
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A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
a. 2.0 × 10^4 J. b. 2.5 × 10^4 J. c. 1.7 × 10^3 J. d. 1.5 × 10^3 J. e. 4.0 × 10^4 J.
Dry air has a density of 1.29 kg/m3 . What would be the volume of a metric ton of air?
The coil shown in the figure has 2 turns, a cross-sectional area of 0.20 m2, and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t2) T, where t is in s. What is the potential difference, VA ? VC, at t = 3.0 s?
a.
?7.2 V
b.
+7.2 V
c.
?4.8 V
d.
+4.8 V
e.
?12 V
In what ways are ground-based observatories catching up with Hubble?
What will be an ideal response?