Answer: The given statement is false.
Explanation:
Combination reactions are defined as the reactions in which two or more substances that can be either elements or compounds when combine together then they result in the formation of a single compound.
For example,
Also, when oxygen atom combines with another substance then it is known as a combustion reaction. And, a combustion reaction will always release energy as they are exothermic in nature.
But is not necessary that light will always be produced in a combustion reaction.
Hence, we can conclude that the statement oxygen is a reactant in a combination reaction, which always produces energy in the form of heat and light, is false.
Answer:
Explanation:
The torque applied by a force can be calculated as
where
F is the magnitude of the force
d is the length of the arm
is the angle between the direction of the force and the arm
In this problem, we have
F = 15 N
d = 2.0 m
Substituting into the equation, we find
Answer:
.
Explanation:
The frequency of a wave is equal to the number of wave cycles that go through a point on its path in unit time (where "unit time" is typically equal to one second.)
The wave in this question travels at a speed of . In other words, the wave would have traveled
in each second. Consider a point on the path of this wave. If a peak was initially at that point, in one second that peak would be
How many wave cycles can fit into that ? The wavelength of this wave
gives the length of one wave cycle. Therefore:
.
That is: there are wave cycles in
of this wave.
On the other hand, Because that of this wave goes through that point in each second, that
wave cycles will go through that point in the same amount of time. Hence, the frequency of this wave would be
Because one wave cycle per second is equivalent to one Hertz, the frequency of this wave can be written as:
.
The calculations above can be expressed with the formula:
,
where