How long ago did the CasA supernova occur?
A.) 100 years ago.
B.) 340 years ago.
C.) 1,600 years ago.
D.) 34 million years ago.
E.) 1.6 billion years ago.
Ans: B.) 340 years ago.
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Which of the following lists the stages of life for a low-mass star in the correct order?
A) protostar, main-sequence star, red giant, planetary nebula, white dwarf B) protostar, main-sequence star, red giant, supernova, neutron star C) protostar, main-sequence star, planetary nebula, red giant D) main-sequence star, white dwarf, red giant, planetary nebula, protostar
Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless, level surface. Attached to the 20-kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.50 m/s2 what is the tension in the connecting string between the blocks?
a. 14 N c. 10 N b. 6.0 N d. 4.0 N
A charge of 0.80 nC is placed at the center of a cube that measures 4.0 m along each edge. What is the electric flux through one face of the cube?
A. 90 N ? m2/C B. 15 N ? m2/C C. 45 N ? m2/C D. 23 N ? m2/C E. 64 N ? m2/C
Two current loops are coaxial and coplanar. One has radius a and the other has radius 2a. Current 2I in the outer loop is parallel to current I in the inner loop. The magnitude of the magnetic field at the center of the two loops is
A.
B.
.C.
.D.
.E.
.