________ radiation is trapped close to our surface by the greenhouse effect
A) Gamma ray B) Ultraviolet C) X-ray D) Infrared E) Radio
D
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A vector is located in the x-y plane. The x- and y-components of this vector are 4.00 m and 3.00 m, respectively. Find the angle that this vector makes with the positive y-axis
A) 53.1° B) 36.9° C) 126.9° D) 22.4° E) 48.6°
A photocathode has a work function of 2.4 eV. The photocathode is illuminated with monochromatic radiation whose photon energy is 3.4 eV. The maximum kinetic energy of the photoelectrons produced is closest to:
A) 1.6 × 10-19 J B) 3.8 × 10-19 J C) 4.4 × 10-19 J D) 4.9 × 10-19 J E) 5.4 × 10-19 J
A motorcycle daredevil wants to ride up a 50.0 m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
a. 79 b. 318 c. 332 d. 355 e. 402
In a photo like the Hubble eXtreme Deep Field (Figure 20.1 in your text), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?
A) the galaxies that are farthest away B) the galaxies that have the most hot, young stars of spectral types O and B C) the galaxies that are the reddest in color D) the galaxies that are nearest to us