Physics, 30.01.2020 02:57, Supermonkey6425
An athlete is working out in the weight room. he steadily holds 50 kilograms above his head for 10 seconds. which statement is true about this situation?
the athlete isnât doing any work because he doesnât move the weight.
the athlete isnât doing any work because he doesnât hold the weight long enough.
the athlete is doing work because he prevents the weight from falling downward.
the athlete is doing work because 50 kilograms is a significant load to lift.
Answers: 2
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Ahollow metal sphere has 6 cm and 11 cm inner and outer radii, respectively. the surface charge density on the inside surface is â100nc/m2. the surface charge density on the exterior surface is:
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Which of the following are properties of mechanical waves? check all that apply âď¸ particles of the medium move back and fourth, but do not move with the wave. âď¸ the particles of the medium always move parallel to the wave motion. âď¸ wave motion begins with a disturbance in the medium. âď¸ waves transport energy from a source outward, away from the source.
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Use the illustration to describe how the electromagnetic spectrum changes as its frequency moves from radio waves to higher energy gamma waves in terms of wavelength and amplitude.
Answers: 1
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