In Miller and Urey's experiment, what did they use to simulate the atmosphere in a sealed, glass container to produce amino acids and organic molecules?
a. volcanic ash
b. electric arc
c. water vapor
d. liquid helium
e. nitrogen gas
b
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A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the emitted light is 642. nm, how many photons are emitted per second?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. The magnitude of the normal force on a box sitting on an incline is equal to that of its weight.
2. Putting wider tires on your car will clearly give you more traction
3. Assume that the coefficient of static friction between your car’s tires and a certain road surface is about 0.75. Your car can climb a 45° slope.
4. We can express the kinetic friction law in the form 
5. A car with four-wheel drive can climb a steeper slope than a car with two-wheel drive.
A photovoltaic cell receives energy input primarily by
A) conduction. B) convection. C) radiation. D) all of the above
The near point of a normal human eye is infinity
Indicate whether the statement is true or false