A lab specimen is 15.2 mm from a convex lens. The image is 4.0 mm tall and 9.0 cm from the lens. How tall is the specimen?
A) 6.8 mm
B) 5.4 mm
C) 1.7 mm
D) 0.68 mm
D
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In case-hardening, carbon is diffused into low-carbon iron to produce a hard surface layer that resists wear and deformation. At a temperature of 600°C it is observed that the hardened surface layer extends 0.001 meter into the surface of the iron after exposure to carbon for two hours. It is desired to have the hardened surface layer extend 0.002 meters into the iron. At 600°C how many hours of carburizing are required?
What will be an ideal response?
If an object moves with constant velocity,
a. its speed is constant. b. its direction is constant. c. its average speed is constant. d. its distance traveled per unit time is constant. e. all of these
A 1 000-V battery, a 3 000-? resistor and a 0.50-µF capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, ?, is defined as the time required to charge the capacitor to 63% of its capacity after the switch is closed. What is the value of ? for this circuit?
a.
6.0 × 109 s
b.
1.7 × 10?10 s
c.
1.7 × 10?7 s
d.
1.5 × 10?3 s