A ventilation fan has blades 0.25 m in radius rotating at 30 rpm. What is the tangential speed of each blade tip?

a. 0.02 m/s
c. 0.79 m/s
b. 0.52 m/s
d. 20 m/s


C

Physics & Space Science

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At what temperature would the root-mean-square speed (thermal speed) of oxygen molecules be 13.0 m/s? Assume that oxygen approximates an ideal gas. The mass of one O2 molecule is 5.312 × 10-26 kg. The Boltzmann constant is 1.38 × 10-23 J/K

A) 0.217 K B) 1800 K C) 5410 K D) 0.0666 K

Physics & Space Science

The theory that inflation occurred in the early universe is incompatible with the theory of relativity

Indicate whether the statement is true or false

Physics & Space Science

A neutron star ________ rapidly

Fill in the blank(s) with correct word

Physics & Space Science

A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet?

a. The magnet will move away from the fixed magnet. b. The magnet will not move. c. The magnet will move toward the fixed magnet. d. The magnet will start to rotate.

Physics & Space Science