Scientists cannot agree on whether viruses are living or not because
A) they are much smaller than other simple living organisms
B) they can reproduce but do not require any utilization of energy to do so
C) they can only reproduce within a host cell and not independently
D) under certain conditions they can reproduce, but they do not contain any DNA
C
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A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about
A) 3 km/h. B) 4 km/h. C) 5 km/h. D) more than 5 km/h.
If the source moves away from you, the frequency you hear is lower than f
Indicate whether the statement is true or false
How much energy (in eV) does a photon of orange light (? = 609 nm) have? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 3.27 eV b. 0.31 eV c. 2.04 eV d. 0.68 eV e. 5.23 eV
A helicopter is traveling at 54 m/s at a constant altitude of 100 m over a level field. If a wheel falls off the helicopter, with what speed will it hit the ground? Note: g = 9.8 m/s2 and air resistance is negligible
a. 40 m/s c. 60 m/s b. 50 m/s d. 70 m/s