An atomic nucleus has a charge of +40e. What is the magnitude of the electric field at a distance of 1.0 m from the nucleus?
A) 5.4 × 10-8 N/C
B) 5.6 × 10-8 N/C
C) 5.8 × 10-8 N/C
D) 6.0 × 10-8 N/C
E) 6.2 × 10-8 N/C
C
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A 4.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.28 
B. 1.44
C. 1.65
D. 1.72
E. 1.98
A tennis player standing 12.6 m from the net hits the ball at 3.00° above the horizontal. To clear the net, the ball must rise at least 0.330 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racket?
What will be an ideal response?
Explain the process that creates a nova
What will be an ideal response?
The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
A) The star is not rotating. B) This is an example of the photoelectric effect. C) This is an example of the Doppler effect. D) The star has a radial velocity towards us. E) The second law of Kirchhoff explains this.