Why is the daytime sky blue?
What will be an ideal response?
Air molecules scatter blue light more efficiently.
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An amusement ride consists of a car moving in a vertical circle on the end of a rigid boom. The radius of the circle is 10 m. The combined weight of the car and riders is 5.0 kN. At the top of the circle the car has a speed of 5.0 m/s which is not changing at that instant. What is the force of the boom on the car at the top of the circle?
a. 3.7 kN down b. 1.3 kN down c. 6.3 kN up d. 3.7 kN up e. 5.2 kN down
An irregular galaxy contains mostly
a. lower-main sequence stars and giants. b. upper main sequence stars and giants. c. upper main sequence stars and gas and dust. d. upper and lower main sequence stars and gas and dust. e. white dwarfs and supergiants.
The technique for producing single crystals of turbine blades is by a modification of
(a) Investment casting (b) Directional solidification (c) The Bridgeman-Stockbarger technique (d) The Czochralski technique
More massive stars are _________ luminous and __________ than less massive stars, thus they pulsate _____________
a. less, smaller, faster b. more, larger, slower c. more, larger, slower d. less, smaller, faster