A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are

a. 0; 0.
b. 0; 2.38 m/s, south.
c. 0; 2.38 m/s, north.
d. 1 000 m, south; 2.38 m/s, south.
e. 1 000 m, north; 2.38 m/s, north.


A

Physics & Space Science

You might also like to view...

A common property of _________metals is their high melting temperature.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Photoelectric Effect: A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)

A. 0.00 eV B. 0.37 eV C. 0.47 eV D. 0.53 eV

Physics & Space Science

A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at 112°C, you measure that it radiates energy at a rate of 71.3 W

What is the emissivity of the surface of this object? Any heat that enters the sphere from the outside environment is negligible. The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4.

Physics & Space Science

The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?

a. 0 b. 0.25 c. 0.50 d. 0.79 e. 1.0

Physics & Space Science