An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. How much mechanical energy is required to increase the temperature of 300 g of water (enough for 1 cup of coffee) from 30°C to 90°C? (1 cal = 4.186 J, the specific heat of water is 4186 J/kg • °C)
a. 94,000 J
c. 5400 J
b. 75,000 J
d. 14 J
B
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Describe how web designers use font families, backup fonts, and embedded fonts in a website.
What will be an ideal response?
You should use interlacing only for web images with smaller file sizes that can be easily downloaded.
Answer the following statement true (T) or false (F)
A freely falling object
a. has a uniformly increasing velocity. b. is unaffected by gravity. c. has a uniformly increasing acceleration. d. has a uniformly increasing displacement.
A 4.0-kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall. The particle rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to the particle?
a. 24 N×s b. 32 N×s c. 40 N×s d. 30 N×s e. 8.0 N×s