The answers is A and C hope this helps :)
Answer:61.275 W
Explanation:
Given
Mass of climber
Height to climb
Time taken
Now Using Work-energy Theorem work done is given by
Now Average Mechanical Power is given by
Energy from the gravitational potential store in converted to kinetic energy. Air friction acts against the object, dissipating some energy as heat or sound. The object will continuously accelerate until the acceleration is equal to the air friction acting against it. This is when it reaches terminal velocity
Answer:
A)
665.5 W
B)
575.5 m
Explanation:
A)
= Sound level registered = 128 dB
= Intensity at reference level = Wm⁻²
= Intensity at the location of meter
Sound level is given as
= power output of the speaker
= distance from the speaker = 2.9 m
Power output of the speaker is given as
B)
= Sound level = 82 dB
= Intensity at reference level = Wm⁻²
= Intensity at the location of meter
Sound level is given as
Power of the speaker is given as
Answer:
discrete lines are observed by the spectroscope, the emission of the lamp is of the ATOMIC source
Explanation:
Bulbs can emit light in several ways:
* When the emission is carried out by the heating of its filament, the bulb is called incandescent, in general its spectrum is similar to that of a black body, this is a continuous spectrum with a maximum dependent on the fourth power of the temperature of the filament.
* The emission can be by atomic transitions, in this case there is a discrete spectrum formed by the spectral lines of the material that forms the gas of the lamp, in general for the yellow emission the most used materials are mercury and sodium or a mixture of they.
Consequently, as discrete lines are observed by the spectroscope, the emission of the lamp is of the ATOMIC type