Of the following gases, which is the most important contributor to the Earth's greenhouse effect?

a. water vapor c. CFCs
b. ozone d. methane


A

Physics & Space Science

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The Hubble time is actually the age the Universe would be if it were totally closed

Indicate whether the statement is true or false

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Gravitational Potential Energy: You do 116 J of work while pulling your sister back on a frictionless swing, whose chain is 5.10 m long, until the swing makes an angle of 32.0° with the vertical. What is your sister's mass?

A. 15.3 kg B. 13.0 kg C. 17.6 kg D. 19.0 kg

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Projectile Motion: A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance?

A. 6.1 m/s B. 7.4 m/s C. 8.1 m/s D. 8.9 m/s

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If a 70 kg person received a dose of 3.2 mGy of gamma rays of RBE = 0.80, what is the biologically equivalent dose in rem?

A. 0.012 B. 0.18 C. 0.0026 D. 0.26 E. 18

Physics & Space Science