Vector = 6.0 m and points 30 north of east. Vector = 4.0 m and points 30 south of west. The resultant vector + is given by
A) 2.0 m at an angle 30 north of east.
B) 2.0 m at an angle 60 north of east.
C) 10.0 m at an angle 60 east of north.
D) 10.0 m at an angle 30 north of east.
E) 10.0 m at an angle 60 north of east.
Question 2You obtain a 100. W lightbulb and a 50. W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct?
A) Both bulbs glow at the same increased brightness.
B) The 100-W bulb glows brighter than the 50-W bulb.
C) Both bulbs glow at the same reduced brightness.
D) The 50-W bulb glows more brightly than the 100-W bulb.
Question 3Oil of specific gravity 0.90 is poured on top of a beaker of water. A cube of plastic of specific gravity 0.95 is placed in the liquid. What fraction of the cube will be immersed in water?
What will be an ideal response?
Question 4The coefficient of linear expansion for aluminum is 24. 10-6K-1. What is the coefficient in units of C-1?
What will be an ideal response?
Question 5While there is no doubt that global temperatures are increasing, it is
A) now becoming clear that human activity is indeed a major contributor to global warming
B) now becoming clear that this effect is due to the slow brightening of the Sun
C) now certain that human activity has no effect on the Earth's climate
D) still not clear whether human activity is affecting the climate at all
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