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A woman has a mass of 50 kg on the moon. What is her mass on Earth?

  1. A
    25 kg
  2. B
    100 kg
  3. C
    0kg
  4. D
    50 kg

Topic Flashcards

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Question

A man has a mass of 80 kg on Earth. What is his mass on the International Space Station, where he is weightless?

Answer

80 kg. Mass is the amount of matter in an object and is independent of gravity. Weightlessness is the absence of the force of weight, not mass. His mass remains 80 kg.

Question

What is the fundamental difference between mass and weight?

Answer

Mass is a scalar quantity measuring the amount of matter (in kg). Weight is a force (in Newtons) caused by gravity acting on that mass (Weight = mass x gravitational acceleration).

Question

If an object weighs 100 N on Earth and 16.6 N on the Moon, what can you conclude about its mass?

Answer

Its mass is the same in both location The weight changed because the gravitational acceleration (g) changed. The mass (m) in the equation W = m*g remained constant. You can calculate it: m = W_earth / g_earth ≈ 100 N / 10 m/s² = 10 kg.

Question

Which instrument measures mass directly, and which measures weight?

Answer

A balance scale measures mass by comparison. A spring scale or digital scale calibrated for Earth measures weight.

Question

A rock has a mass of 5 kg. What would be the reading on an ideal spring scale for this rock on the Moon, where gravity is 1/6th of Earth's? (Use g_earth = 10 m/s² for simplicity).

Answer

Approximately 8.33 N (or 5/6 of 10 N). First, find weight on Earth: W_earth = 5 kg * 10 m/s² = 50 N. Weight on Moon is 1/6th of that: W_moon = 50 N / 6 ≈ 8.33 N. The mass is still 5 kg.

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