Which of the following processes would you expect to produce small-diameter PE fibers that have a very high tensile strength?
(a) Draw fibers from a liquid
(b) Draw fibers at a temperature just below the glass transition temperature
(c) Draw fibers at a temperature just above the glass transition temperature
(d) Draw fibers at room temperature
(c) Draw fibers at a temperature just above the glass transition temperature
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The amount of water displaced by a liter-sized block of ordinary wood floating in water is
A) less than 1 liter. B) 1 liter. C) more than 1 liter. D) depends on the water density E) none of the above
A 400-g block of iron at 400°C is dropped into a calorimeter containing 60 g of water at 30°C. How much steam is produced? The latent heat of vaporization of water is 22.6 × 105 J/kg
The average specific heat of iron over this temperature range is 560 J/(kg K). A) 22 g B) 33 g C) 42 g D) 54 g E) 59 g
A spring-loaded dart gun is used to shoot a dart straight up into the air, and the dart reaches a maximum height of 24 meters
The same dart is shot up a second time from the same gun, but this time the spring is compressed only half as far (compared to the first shot). How far up does the dart go this time (neglect all friction and assume the spring is ideal)? A) 6.0 m B) 12 m C) 3.0 m D) 48 m
A 10-V-emf battery is connected in series with the following: a 2-µF capacitor, a 2.0-? resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. At the instant the switch is closed, what are the current and capacitor voltage readings, respectively?
a.
zero A, 10 V
b.
zero A, zero V
c.
5 A, zero V
d.
5 A, 10 V