A 4.00-g lead bullet is traveling at a speed of 200 m/s when it embeds in a wood post. If we assume that half of the resultant heat energy generated remains with the bullet, what is the increase in temperature of the embedded bullet? (specific heat of lead = 0.0305 kcal/kg/°C, 1 kcal = 4 186 J)
a. 78.3 °C
b. 157 °C
c. 313 °C
d. 39.2 °C
e. 97.9 °C
a
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An object of mass 4.0 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. How high did the object go?
A) 20 m B) 4.5 m C) 15 m D) 80 m E) None of the other choices is correct.
A baseball player throws a ball straight up into the air. At a height of 3.00 m above the release point, the ball is moving at 1.25 m/s. What was the ball's initial speed?
a. 7.56 m/s b. 7.77 m/s c. 57.2 m/s d. 60.4 m/s
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95% b. 60% c. 80% d. 64% e. 75%
The types of current carried by the headlights of an automobile, and by a plug-in toaster in your kitchen, are
A) both DC. B) both AC. C) AC and DC, respectively. D) DC and AC, respectively. E) None of the above.