Which of the following colors has the shortest wavelength?
A. violet
B. yellow
C. green
D. red
E. blue
Answer: A
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In a star, the balance between the inward force of gravity and the outward force of thermal and radiation pressure is called
a. the neutrino bonding point. b. hydrostatic equilibrium. c. the plasma equality condition. d. strong nuclear binding.
Evidence for very recent water erosion on Mars comes from the observations of
A) dark streaks on crater walls B) channels carved on the slopes of volcanoes C) dried up river beds on the highlands D) mud flows surrounding craters
Describe mechanical efficiency
What will be an ideal response?
A speed boat requires 85.0 kW to move at a constant speed of 14.0 m/s. What is the resistive force of the water at this speed?
a. 1 190 N b. 6 070 N c. 6 170 N d. 5 970 N e. 1 290 N