A mass of 50 kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m.
How much will the wire stretch?
The Young's modulus for steel is 20 x 1010 N/m².
4.5 cm.
2.5 cm.
1.5 cm.
3.5 cm.
Which of the following experimental results of the photoelectric effect can be explained by the classical or wave theory?
The instantaneous emission of electrons from a metal surface even with faint incident radiation
The kinetic energy of emitted electrons depending on frequency of incident radiation
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
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?
25000 N.
2500 N
1000 N
5000 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.
2.5 x 1010 N/m².
1.0 x1012 N/m².
1.0 x 1011 N/m².
