Imagine that the sun ceased emitting light at wavelengths from about 600 to 700 nm. How would this look to us, and why?
What will be an ideal response?
The sun would appear blue-green to our eyes, since it would no longer be emitting red light to mix with blue and green to appear yellow-white.
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A mass src="https://sciemce.com/media/4/d7a1e25d698e02ae34.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless incline as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
2.00 kg, 
is 1.00 kg, M is 4.00 kg, and the angle is 60.0 degrees, then what is the acceleration of
A. 3.98 
down
B. 3.27
down
C. 3.15
down
D. 2.94
down
E. 1.64
down
Why did early astronomers conclude that Earth had to be motionless?
An emf of 0.26 V is induced in a 0.40-H inductor. What is the rate of change of current through the inductor?
a. 0.80 A/s c. 0.13 A/s b. 1.3 A/s d. 0.65 A/s
A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?
a. at the 40-cm mark b. at the 45-cm mark c. at the 50-cm mark d. at the 55-cm mark e. at a position not given