The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 91.50 in2. The number of significant figures in the width measurement must be at least:
a. 5
b. 6
c. 8
d. 4
Answer: 4
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A 5.00-g lead bullet moving at 440 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy goes into heating the bullet, what is the bullet's change in temperature? The specific heat of lead is 128 J/(kg•K)
A) 94.0 K B) 110 K C) 126 K D) 278 K E) 378 K
What is the effect of adding some boron on how easily a silicon crystal conducts electricity?
A. The crystal becomes more conductive. B. The crystal becomes less conductive. C. The boron creates new energy levels for electrons but does not change the crystal’s conductivity.
A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
a. 9.9 s b. 7.8 s c. 8.5 s d. 9.2 s e. 6.4 s
According to the nebular theory of solar system formation, which law best explains why the central regions of the solar nebula got hotter as the nebula shrank in size?
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