Explanation:
Velocity ratio of simple machine is the ratio of distance travelled by effort to the distance travelled by load in the machine. The efficiency of a simple machine is defined as the ratio of useful work done by machine (output work) to the total work put into the machine (input work).
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Answer: Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=50cm.Jul 6, 2019
There is a relationship between energy, current, voltage and time. The formula to be used is written below:
E = IVt,
where
I is the current in amperes
V is voltage in volts
t is the time in seconds
Substituting the values,
E = (0.5 A)(120 V)(60 s)
<em>E = 3,600 J</em>
Answer:
A material that contains three elements joined in a fixed proportion will be a <u><em>compound.</em></u>
Explanation:
An element can be described as a substance that is made of only one kind of atom.
<em>On the other hand, a compound can be described as a substance that is made up of more than one atom or elements. A compound can contain fixed proportions of each element that it is made of or it can even contain different proportions of each element. </em>
For example, carbon dioxide is a compound which will always contain 12 grams of carbon for every 32 grams of oxygen.