When the Sun moves off the main sequence, it will next become a _______________
a. red giant
b. dwarf star
c. white dwarf
d. black hole
a
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Free Fall: A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?
A. 2.1 m/s B. 4.9 m/s C. -2.1 m/s D. -4.9 m/s E. 0.00 m/s
A brass pipe is twisted by torques T 5 800 N?m acting at the ends causing an angle of twist of 3.58. The pipe has the following properties: L 5 2.1 m, d1 5 38 mm, and d2 5 56 mm. The shear modulus of elasticity G of the pipe is approximately:
(A) 36.1 GPa
(B) 37.3 GPa
(C) 38.7 GPa
(D) 40.6 GPa
A 120.0 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 
The smallest diameter the nail can be is
A. 10.46 mm. B. 12.36 mm. C. 14.84 mm. D. 16.67 mm. E. 18.35 mm.
A parallel-plate capacitor filled with air carries a charge Q. The battery is disconnected, and a slab of material with dielectric constant K = 2 is inserted between the plates. Which of the following statements is true?
1.The voltage across the capacitor decreases by a factor of 2. 2.The voltage across the capacitor is doubled. 3.The charge on the plates is doubled. 4.The charge on the plates decreases by a factor of 2. 5.The electric field is doubled.