Which of the following observations lend support to the big bang theory?
A) the cosmic background radiation
B) the ripples, or variations, in the cosmic background radiation
C) Both of the above.
D) the "red shift" of the light from distant galaxies
E) All of the above.
E
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A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm. A long wire carries a current of 2.0 A along the axis of the solenoid. What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire?
a. 78 ?T b. 55 ?T c. 48 ?T d. 68 ?T e. 2.0 ?T
When 1.0 gram of hydrogen combines with 8.0 grams of oxygen, 9.0 grams of water is formed. But is this true? During the reaction 2.86 × 105 J of energy is released. How much mass is actually lost in this reaction?
What will be an ideal response?
If two objects each carrying a charge of 1 coulomb were placed 1 meter apart, how much force would they exert on each other?
A) 9 N B) 106 N C) 9 x 109 N D) zero E) 1 N
The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?
?
?
a.
1.8 m/s2
b.
2.6 m/s2
c.
1.4 m/s2
d.
2.2 m/s2
e.
3.7 m/s2