A 5000-N force compresses a steel block by 0.0025 cm.
How much force would be needed to compress the block by 0.0125 cm?
5000 N.
2500 N
25000 N.
1000 N
A wire of diameter 0.20 mm stretches by 0.20% when a 6.28N force is applied.
What is the elastic modulus of the wire?
2.5 x 1012 N/m².
1.0 x1012 N/m².
1.0 x 1011 N/m².
2.5 x 1010 N/m².
Which of the following experimental results of the photoelectric effect can be explained by the classical or wave theory?
Maximum speed of emitted electrons is independent of the intensity of the incident radiation
Number of photoelectrons emitted per unit time increases with light intensity
The kinetic energy of emitted electrons depending on frequency of incident radiation
The instantaneous emission of electrons from a metal surface even with faint incident radiation
A steel lift column in a service station is 4.0 m long and 0.20 m in diameter. Young's modulus for steel is 20 x 1010 N/m².
By how much does the column shrink when a 5000-kg truck is on it?
7.8 x 10⁻⁶ m.
8.0 x 10⁻⁷ m.
3.1 x 10⁻⁵ m.
3.2 x 10⁻⁶ m.
