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
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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
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
The Hubble time is actually the age the Universe would be if it were totally closed
Indicate whether the statement is true or false
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