You are generating traveling waves on a stretched string by wiggling one end. If you suddenly begin to wiggle more rapidly witho
1 answer:
Answer:
B) Faster than before
Explanation:
By the time you begin to wiggle the string more rapidly you are indirectly increasing the number of cycles of the generated wave per second. This means that you are increasing the frequency of the generated wave.
Recall that the frequency of a travelling wave depends on the source of the wave. You generating the wave are the source of the wave.
The general relationship between velocity, frequency and wavelength is given by equation (1);
This shows a linear and direct relationship between velocity v and frequency f. That is to say that when frequency increases, velocity will also increase and vice versa.
As long as other factors such as the tension in the string remains constant, wiggling at a more rapid rate increases the frequency and which also increases the velocity, causing the wave to travel faster than before.
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Answer:
The cost of running the electric water heater for one year is 55.2391 $
Explanation:
The simple rule of 3 helps to quickly solve proportionality problems when you have three known values and one unknown. If two quantities are directly proportional (that is, when multiplying or dividing one of them by a number, the other is multiplied or divided respectively by the same number) the rule of three can be applied as follows:
a ⇒ b
c ⇒ x
So:
where a, b and c are the known values and x is the value you want to find out.
In this case, you can first apply the following rule of three: if 2.5 kW are consumed in 1.9 hours, in 1 hour how many kW are consumed?
kWh=1.316
So an electric water heater consumes 1.316 kWh in one day. You apply another simple rule of three: if the heater in 1 day consumes 1.316 kWh, in 365 days (1 year) how many kWh are consumed?
kWh= 480.34
So an electric water heater consumes 480.34 kWh in a year.
If 1 kWh costs 11.5 cents, 480.34 kWh how many cents does it cost?
cost= 5,523.91 cents
Finally, if 100 cents is equal to 1 dollar, 5,523.91 cents, how many dollars are equal?
cost= 55.2391 $
<u><em> The cost of running the electric water heater for one year is 55.2391 $</em></u>
Explanation:
The electro magnetic force is given by
F =
where and
are charged particles
k =Coulombs constant
r = distance between two charges
And gravitational force is given by
F =
where and
are masses
G =Garvitation constant
r = distance between two masses
Now since the planets, stars and galaxies are electrically neutral, therefore they have zero electrical charge and so electro magnetic forces have no affect on these planets, stars and heavenly bodies.
Whereas the masses of the heavenly bodies are very large, so they are largely affected by the gravitational force since Gravitational force is directly proportional to the product of the masses of a body.
Therefore, though the electromagnetic force is stronger than the gravitational force, the electromagnetic force does not dominate the forces in the heavenly bodies as they as not electrically charged.