A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit around the Earth and then use the light from the Sun to push this "solar sail." Suppose a sail of area A = 6.90 x 105 m2 and mass m = 5,000 kg is placed in orbit facing the Sun. Ignore all gravitational effects and assume a solar intensity of 1,370 W/m2. (a) What force (in N) is exerted on the sail? (Enter the magnitude.) N (b) What is the sail's acceleration? (Enter the magnitude in um/s².) ) um/s² (c) Assuming the acceleration calculated in part (b) remains constant, find the time interval (in days) required for the sail to reach the Moon, 3.84 x 10° m away, starting from rest at the Earth. days (d) What If? If the solar sail were initially in Earth orbit at an altitude of 400 km, show that a sail of this mass density could not escape Earth's gravitational pull regardless of size. (Calculate the magnitude of the gravitational field in m/s.) m/s2 (e) What would the mass density (in kg/m-) of the solar sail have to be for the solar sail to attain the same initial acceleration as that in part (b)? ] kg/m²

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**Solar Sail Problem Set**

A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit around the Earth and then use the light from the Sun to push this "solar sail." Suppose a sail of area \( A = 6.90 \times 10^5 \, \text{m}^2 \) and mass \( m = 5,000 \, \text{kg} \) is placed in orbit facing the Sun. Ignore all gravitational effects and assume a solar intensity of \( 1,370 \, \text{W/m}^2 \).

**(a)** What force (in N) is exerted on the sail? (Enter the magnitude.)

[Text box for answer] N

**(b)** What is the sail’s acceleration? (Enter the magnitude in \(\mu\text{m/s}^2\).)

[Text box for answer] \(\mu\text{m/s}^2\)

**(c)** Assuming the acceleration calculated in part (b) remains constant, find the time interval (in days) required for the sail to reach the Moon, \( 3.84 \times 10^8 \, \text{m} \) away, starting from rest at the Earth.

[Text box for answer] days

**(d) What If?** If the solar sail were initially in Earth orbit at an altitude of 400 km, show that a sail of this mass density could not escape Earth's gravitational pull regardless of size. (Calculate the magnitude of the gravitational field in \(\text{m/s}^2\).)

[Text box for answer] \(\text{m/s}^2\)

**(e)** What would the mass density (in \(\text{kg/m}^2\)) of the solar sail have to be for the solar sail to attain the same initial acceleration as that in part (b)?

[Text box for answer] \(\text{kg/m}^2\)
Transcribed Image Text:**Solar Sail Problem Set** A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit around the Earth and then use the light from the Sun to push this "solar sail." Suppose a sail of area \( A = 6.90 \times 10^5 \, \text{m}^2 \) and mass \( m = 5,000 \, \text{kg} \) is placed in orbit facing the Sun. Ignore all gravitational effects and assume a solar intensity of \( 1,370 \, \text{W/m}^2 \). **(a)** What force (in N) is exerted on the sail? (Enter the magnitude.) [Text box for answer] N **(b)** What is the sail’s acceleration? (Enter the magnitude in \(\mu\text{m/s}^2\).) [Text box for answer] \(\mu\text{m/s}^2\) **(c)** Assuming the acceleration calculated in part (b) remains constant, find the time interval (in days) required for the sail to reach the Moon, \( 3.84 \times 10^8 \, \text{m} \) away, starting from rest at the Earth. [Text box for answer] days **(d) What If?** If the solar sail were initially in Earth orbit at an altitude of 400 km, show that a sail of this mass density could not escape Earth's gravitational pull regardless of size. (Calculate the magnitude of the gravitational field in \(\text{m/s}^2\).) [Text box for answer] \(\text{m/s}^2\) **(e)** What would the mass density (in \(\text{kg/m}^2\)) of the solar sail have to be for the solar sail to attain the same initial acceleration as that in part (b)? [Text box for answer] \(\text{kg/m}^2\)
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