Which gases within our atmosphere act as greenhouse gases?

a. water
b. carbon dioxide
c. oxygen and nitrogen
d. all of the above
e. a and b


Answer : e. a and b

Physics & Space Science

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A miracle car with a 100% efficient engine burns fuel having a 40-megajoules-per-liter energy content. If air drag and overall frictional forces at highway speeds totals 1000 N, what distance per liter can be achieved on the highway?

A) 30 km B) 40 km C) 50 km D) more than 50 km E) need more information

Physics & Space Science

A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The velocity of the 1200 kg car after the collision is

A. 4.0 m /s EAST. B. 1.0 m/s EAST. C. 4.0 m/s WEST. D. 1.0 m/s WEST. E. 3.00 m/s EAST.

Physics & Space Science

The Paschen series of hydrogen corresponds to electron transitions from higher levels to n = 3 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)

a. 822 nm c. 1880 nm b. 365 nm d. 1094 nm

Physics & Space Science

What is the name for the period of time it takes the Moon to circle the Earth once?

What will be an ideal response?

Physics & Space Science