A conducting sphere of radius 10.0 cm holds a net charge of 4.4 ?C. What is the surface charge density?
A. 0.0
B. 
C. 
D. 
E. 
B.
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As the intensity of light is increased in a photoelectric effect experiment, the energy of the emitted electrons increases
a. True b. False Indicate whether the statement is true or false
Very importantly, a hydraulic press can multiply
A) forces. B) pressures. C) energy. D) all of the above E) none of the above
Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Mort observes
A) the beam moving just 1000 km/s faster than Velma. B) the beam moving away at 300,000 km/s. C) Both of the above. D) the beam moving 300,000 km/s faster than Velma. E) All of the above.
Briefly describe how a star forms.
What will be an ideal response?