A 90-V Battery Costs $1 $\$ 11,000 / \mathrm { kWh }$

question 58

Multiple Choice

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced. If this battery supplies a current of 25 mA to the player, what is the
Cost of the energy provided by the battery in dollars per kWh?

• A) \(\$ 11,000 / \mathrm { kWh }\)
• B) \(\$ 110 / \mathrm { kWh }\)
• C) \(\$ 11 / \mathrm { kWh }\)
• D) \(\$ 1100 / \mathrm { kWh }\)

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Definitions:

Hemidesmosome

Similar to half a desmosome, attaching epithelial cells to the basement membrane.

Capillary Walls

The thin, permeable barriers of capillaries through which exchange of gases, nutrients, and wastes occurs between blood and tissues.

Simple Squamous Epithelium

A solitary layer of flattened cells lining areas engaged in diffusion and filtration, including blood vessels and lung air sacs.

Keratinized Epithelium

A type of epithelial tissue that has become hardened or cornified through the incorporation of keratin, often found in the outer layers of the skin, hair, and nails.