The walls of cells are referred to by biologists as

A) linings
B) coats
C) shells
D) membranes


D

Physics & Space Science

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A 500-kg elevator is pulled upward by a cable that exerts a constant force of 5500 N on the elevator for a distance of 50.0 m. The elevator is the system

(a) What is the work done by the 5500-N force? (b) What is the work done by the gravitational force? (c) What is the net work done on the elevator?

Physics & Space Science

The hydrogen in the universe was formed by the energy of the Big Bang

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

To increase the current density in a wire of length l and diameter D, you can

a. decrease the potential difference between the two ends of the wire. b. increase the potential difference between the two ends of the wire. c. decrease the magnitude of the electric field in the wire. d. heat the wire to a higher temperature. e. combine both (b) and (d).

Physics & Space Science

According to the _____, the Moon broke from a rapidly spinning proto-Earth

A) condensation hypothesis B) fission hypothesis C) capture hypothesis D) large-impact hypothesis

Physics & Space Science