The end of the cutting cord on a gas-powered weed cutter is 0.21 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord?
a. 13 m/s
b. 4.2 m/s
c. 26 m/s
d. 2.7 m/s
c
Physics & Space Science
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Almost all the helium in the universe was formed between 2-15 minutes after the Big Bang
Indicate whether the statement is true or false
Physics & Space Science
A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is
A) 1/2 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 2/3 m/s. E) 3/2 m/s.
Physics & Space Science
A torque of 12 N ? m is applied to a solid, uniform disk of radius 0.50 m, causing the disk to accelerate at 5.7 rad/s2. What is the mass of the disk?
A) 17 kg B) 13 kg C) 8.5 kg D) 4.3 kg
Physics & Space Science
If a metal had a Fermi level of 5.0 eV, what would be the average energy of the electrons at 0 K?
A) 8.0 eV B) 6.0 eV C) 3.0 eV D) 0 E) 5.0 eV
Physics & Space Science