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ratelena [41]
3 years ago
12

Hansel pushes a 2 lb. box 5 feet in 20 seconds. How much work has he done?

Physics
1 answer:
Licemer1 [7]3 years ago
8 0
Work = force x distance

You can see time doesn’t matter (if we were talking about power, which is the RATE at which work is performed, that would be a different story).

W = 2 x 5 = 10 foot-pounds of work

Foot-pounds are gross units. Better to work in SI units when you can!

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Light with energy equal to three times the work function of a given metal causes the metal to eject photoelectrons. What is the
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<h3 /><h3>What is the photoelectric effect?</h3>

When a medium receives electromagnetic radiation, electrostatically charged particles are emitted from or inside it.

The emission of ions from a steel plate when light falls on it is a common definition of the effect. The substance could be a solid, liquid, or gas; and the released particles could be protons or electrons.

A particular metal emits photoelectrons when exposed to light with energy three times its work function:

\rm KE=3 \phi

The ratio of the maximum photoelectron kinetic energy to the work function will be;

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brainly.com/question/9260704

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