A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm
b. 2.5 cm
c. 12.5 cm
d. 25 cm
e. 1.25 cm
b
Physics & Space Science
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If the torque on an object adds up to zero
A) the forces on it also add up to zero. B) the object is at rest. C) the object cannot be turning. D) the object could be accelerating linearly but it could not be turning. E) the object could be both turning and accelerating linearly.
Physics & Space Science
In which of these v versus t graphs is the acceleration changing?
A. (a)
B. (b)
C. (c)
D. (d)
Physics & Space Science
Describe ferromagnetism
What will be an ideal response?
Physics & Space Science
If it takes 50 photons per 0.1 s entering the eye so that the brain senses the light, which of the following colors of light would be delivering the most power to the eye at this minimum perception level?
a. red c. blue b. violet d. All would be delivering the same power.
Physics & Space Science