A 1500-kg car rounds an unbanked curve with a radius of 52 m at a speed of 14 m/s. What minimum coefficient of friction must exist between the road and tires to prevent the car from slipping? (g = 9.8 m/s2)
a. 0.18
c. 0.28
b. 0.30
d. 0.38
D
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What does it mean for something to be "quantized?"
a. It can have only certain discrete values. b. It can have only integer values. c. It can have values only between certain limits. d. none of the above
In which of the following types of galaxies would you expect to find active star formation?
a. elliptical galaxies only b. elliptical and spiral galaxies c. spiral galaxies only d. elliptical and irregular galaxies e. spiral and irregular galaxies
Which of the following types of electromagnetic radiation has the highest frequency?
a. x-rays b. visible light c. radio d. gamma-rays e. infrared radiation
Helium fusion does not begin until the star has entered the giant region of the H-R diagram
Indicate whether the statement is true or false