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The radius of earth is about 6400 km and Mars is 3200 km . The mass of earth is about 10 times the mass of Mars . An object weighs 200 N on the surface of earth . Its weight on the surface of Mars will be ?
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The radius of earth is about 6400 km and Mars is 3200 km . The mass of...
Understanding Weight on Different Planets
Weight is the force exerted on an object due to gravity. It can be calculated using the formula:
Weight = mass × gravitational acceleration (g).
Gravitational Acceleration on Earth and Mars
- The gravitational acceleration on Earth (g_E) is approximately 9.81 m/s².
- The gravitational acceleration on Mars (g_M) can be derived using the relationship between mass and radius.
Given:
- Mass of Earth (M_E) = 10 × Mass of Mars (M_M)
- Radius of Earth (R_E) = 6400 km
- Radius of Mars (R_M) = 3200 km
Using the formula for gravitational acceleration (g = G * M / R²), we can substitute the known values.
Calculating Gravitational Acceleration on Mars
- The ratio of gravitational accelerations can be expressed as:
g_M / g_E = (M_M / R_M²) / (M_E / R_E²)
- Substituting M_E = 10M_M and R_E = 2R_M, we find:
g_M = (1/4) * g_E
- Therefore, g_M ≈ 2.45 m/s².
Weight Calculation on Mars
- The weight of the object on Earth is 200 N.
- Mass of the object (m) can be calculated from Earth's weight:
m = Weight_E / g_E = 200 N / 9.81 m/s² ≈ 20.39 kg.
- Now, calculate the weight on Mars:
Weight_M = m × g_M = 20.39 kg × 3.71 m/s² ≈ 75.7 N.
Conclusion
- The weight of the object on the surface of Mars will be approximately 75.7 N.
This demonstrates how weight changes due to variations in gravitational acceleration on different celestial bodies.
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The radius of earth is about 6400 km and Mars is 3200 km . The mass of earth is about 10 times the mass of Mars . An object weighs 200 N on the surface of earth . Its weight on the surface of Mars will be ?
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