η = 13.8 lm/W. The luminous efficacy of a incandescent lightbulb that produces 830 lumens and consumed a power of 60 W is 13.8 lm/W.
The luminous efficacy of a light source is the relationship between the luminous flux (in lumens) emitted by a light source and the power (in watts). The luminous efficacy of a light source or luminous efficiency measures the part of electrical energy that is used to illuminate and is obtained by dividing the luminous flux emitted by the electrical power consumed. Luminous efficiency is expressed in lumens per watt (lm / W). It is given by the relation:
η = F / P. Where F is the luminous flux, and P is the power consumed by the light source.
The efficacy of a 60.0 W incandescent lightbulb that produces 830 lm is:
η = 830 lm / 60 W
η = 13.8 lm/W
Answer:
Explanation:
Good sources include barley, oatmeal, beans, nuts, and fruits such as apples, berries, citrus fruits, and pears. Many foods contain both soluble and insoluble fiber. In general, the more natural and unprocessed the food, the higher it is in fiber. There is no fiber in meat, dairy, or sugar.
Answer:
<u>Rigid bodies:</u> Options d and e
<u>Rigid bodies' system:</u> options f, g and h
<u>Non-rigid bodies:</u> Options a, b and c
Explanation:
The above classification of the mentioned objects into rigid bodies, non rigid bodies and system of rigid bodies can be explained as :
Rigid body: A body which does not undergo any change in its form or shape on application of externally applied load or force is said to be a rigid body.
System of Rigid bodies:
A system of rigid bodies is different from any other element system as in this the bodies constituting the system must be rigid bodies.
Non-rigid bodies:
A body which undergoes a change in its form or shape on application of externally applied force or load is said to be a non-rigid body.
So to find the mass we must use the formula D=M/V but because we don’t have the mass, we must use the formula M=DxV
So to find volume, just multiple the length (0.4m) width (0.4m) and height (2m) and you will get 0.32m as the volume. Now multiple this volume with your given density of 2,400 kg/m and you will get 768 kg as the mass of the marble block.
Final answer: 768 kilograms (kg) as mass of the marble block.
When a new path of lesser resistance is made for an existing circuit a(n) short circuit occurs.
<h3>
What is short circuit?</h3>
An electrical circuit short circuit is when two nodes that are supposed to be connected at different voltages make an improper connection. This leads to an electric current that can damage circuits, cause overheating, fire, or explosions, and is only constrained by the network's remaining nodes' equivalent Thevenin resistance. While short circuits are typically the result of a failure, they can occasionally be brought on purpose, such as when voltage-sensing crowbar circuit protectors are being installed.
An electrical connection that requires two nodes to have the same voltage is known as a short circuit in circuit analysis. Since there is no resistance and hence no voltage drop across the link in a "perfect" short circuit, there is no short circuit.
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