What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
What will be an ideal response?
621 nm
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What proportion of their lives do stars spend fusing hydrogen to helium in their cores?
A) 90% B) 70% C) 50% D) 10%
An airplane starts from rest and accelerates at a constant 10.8 m/s2. What is its speed at the end of a 400 m-long runway?
A) 4320 m/s B) 93.0 m/s C) 37.0 m/s D) 186 m/s E) 65.7 m/s
A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
What happens to the resistivity of a typical semiconductor as its temperature increases?
A) The resistivity increases for a while and then decreases. B) The answer depends on the semiconductor. C) The resistivity decreases. D) The resistivity increases. E) The resistivity remains the same.