Explain how a greenhouse works

What will be an ideal response?


When sunlight shines through the glass roof of a greenhouse, it heats the benches and plants inside.
The warmed interior radiates infrared radiation, but the glass is opaque to infrared. Warm air in the greenhouse cannot mix with cooler air outside, so heat is trapped within the greenhouse, and the temperature climbs until the glass itself grows warm enough to radiate heat away as fast as the sunlight enters.

Physics & Space Science

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Define specific heat at constant volume.

What will be an ideal response?

Physics & Space Science

A 2000 kg car is traveling on a banked curved icy road. The road is banked at an angle of 12.0 degrees and has a radius of curvature of 500 m. The velocity of the car necessary to travel on the icy road without sliding is

A. 32.3 m/s. B. 40.5 m/s. C. 42.8 m/s. D. 49.5 m/s. E. 50.2 m/s.

Physics & Space Science

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.00 m height. What is the velocity vector when the projectile hits the roof?

A. Vx = 17.3 m/s, Vy = +13.4 m/s B. Vx = 14.3 m/s, Vy = -3.23 m/s C. Vx = 15.2 m/s, Vy = -13.4 m/s D. Vx = 16.8 m/s, Vy = -3.95 m/s E. Vx = 17.3 m/s, Vy = -13.4 m/s

Physics & Space Science

By what factor is the resistance of a copper wire changed when its temperature is increased from 30.0°C to 115°C? The temperature coefficient of resistivity for copper = 3.9 × 10^?3 (°C)?1

a. 1.45 b. 1.12 c. 1.33 d. 0.669 e. 4.32

Physics & Space Science