Molecular Speeds: If an ideal gas molecule has a speed of 0.50 km/s at 20°C, what is its speed at 80°C?

A. 500 m/s
B. 550 m/s
C. 1000 m/s
D. 2000 m/s


Answer: B

Physics & Space Science

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Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, assuming negligible air resistance?

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Which of the following is not consistent with recent observations of the cosmic microwave background by Planckt?

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Physics & Space Science