If a star is extremely massive (well over 100 solar masses), why isn't it likely to survive for long?
A) It explodes as a supernova after just a few dozen years.
B) It may blow itself apart because of radiation pressure.
C) It eventually divides into two lower-mass stars.
D) Its great mass will cause it to suck itself into becoming a black hole.
B
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If the rms value of the electric field is 9.0 V/m at a distance of 6.0 m from an isotropic source, what is the rms value of the magnetic field at a distance of 12 m from the source?
a. 
b. 
c. 
d. 
e. 
Latent Heats: A 45.0-kg sample of ice is at 0.00°C. How much heat is needed to melt it? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg.
A. 1.50 × 104 kJ B. 4.10 × 106 kJ C. 0.00 kJ D. 1.02 × 105 kJ
Charge in an Electric Field: A pair of charged conducting plates produces a uniform field of 12,000 N/C, directed to the right, between the plates. The separation of the plates is 40 mm. An electron is projected from plate A, directly toward plate B, with an initial speed of v0 = 2.0 × 107 m/s. What is the speed of the electron as it strikes plate B? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg) 
A. 1.2 × 107 m/s B. 1.5 × 107 m/s C. 1.8 × 107 m/s D. 2.1 × 107 m/s E. 2.4 × 107 m/s
Explain why equipotential surfaces are always perpendicular to the electric field vectors
What will be an ideal response?