Cepheid variable stars are more luminous than the sun

Indicate whether the statement is true or false


T

Physics & Space Science

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What will be an ideal response?

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Dry air has a density of 1.29 kg/m3 . What would be the volume of a metric ton of air?

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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.

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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

Physics & Space Science