Which of these gases is most responsible for the greenhouse effect on Earth?

a. oxygen (O2)
b. nitrogen (N2)
c. carbon dioxide (CO2)
d. ozone (O3)
e. ammonia (NH3)


c

Physics & Space Science

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A container of water is placed on a scale, and the scale reads 120. g. Now a 20.0g piece of copper (specific gravity = 8.90 ) is suspended from a thread and lowered into the water, not touching the bottom of the container

What will the scale now read? A) 140 g B) 120 g C) 138 g D) 122 g E) 112 g

Physics & Space Science

A mass of 3.0 kg rests on a smooth surface inclined 34° above the horizontal. It is kept from sliding down the plane by a spring attached to a wall. The spring is aligned with the plane and has a spring constant of 120 N/m

How much does the spring stretch? A) 360 cm B) 240 cm C) 14 cm D) 24 cm E) 36 cm

Physics & Space Science

A certain automobile tire has a volume of 0.0185 m3. If the absolute (or total) pressure in the tire is 500 kPa and the temperature is 298 K, how many molecules are there inside the tire? (R = 8.31 J/mol ? K, NA = 6.022 × 1023 molecules/mol)

A) 2.25 × 1023 molecules B) 2.25 × 1024 molecules C) 3.25 × 1023 molecules D) 3.25 × 1024 molecules E) 3.25 × 1025 molecules

Physics & Space Science

What is the wavelength of a 0.40 kg object moving at 25 m/s?

A. 0.40 kg objects don't have wavelengths
B. 10 m
C. 0.10 m
D.
E.

Physics & Space Science