Which of the following normally warms up fastest when heat is applied?
A) water
B) iron
C) glass
D) wood
E) all of the above
Answer: B
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A 2.5-kg object suspended from the ceiling by a string that has a length of 2.5 m is released from rest with the string 40° below the horizontal position. What is the tension in the string at the instant when the object passes through its lowest position?
a. 11 N b. 25 N c. 42 N d. 18 N e. 32 N
A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the
A) heavier car. B) lighter car. C) same on each.
The overall result of the proton-proton chain is
A) 6 H becomes 1 He + energy. B) p + p becomes 2H + energy. C) 4 H becomes 1 He + energy. D) Individual protons are joined into long chains of protons.
A ray of light is incident on a liquid-to-glass interface at an angle of 34.1°. Indices of refraction for the liquid and glass are, respectively, 1.93 and 1.64 . What is the angle of refraction for the ray moving through the glass?
a. 23.9° b. 28.5° c. 41.3° d. 29.0° e. 40.6°