Answer:true,because velocity is directly proportional to speed or velocity
Explanation:
Velocity = frequency x wavelength
The velocity or speed varies directly with the frequency, so as the frequency is increased, the velocity or speed is also increased
Answer:
The electrical force between two balloons is 67.5N.
Explanation:
There are two charged balloons, let's say a and b.
The charge on the balloon a = C
The charge on the balloon b = C
Both balloons are 1 cm apart; it means that the distance<em> r</em> between the balloon a and the balloon b is 0.01 m (since 1 cm = 0.01 m).
We need to find the electrical force between them. By using the Coulomb's law, the magnitude of the electrical force between both the balloon is given as follows:
--- (A)
Where,
k = Coulomb's constant = =
Plug all the values in the equation (A):
Hence, the electrical force between two balloons is 67.5N (three significant figures).
Answer:
Explanation:
The trick is in finding the volume.
Final Volume = 26.64
Initial Volume=<u>20.92</u> Subtract
Metal Volume 5.72 cm^3
Density = mass / volume
Density = 72.17 / 5.72
Density = 12.617
The equation for potential energy is PE = mgh, where m = mass of the object (sled), g = acceleration due to gravity (9.8 m/s^2), and h = height of the object.
Let's say that, at the bottom of the slope, the height if 0m. That means the height of the object, the sled, is h = 2m. We are also told that the mass of the sled is m = 45kg and that g = 9.8 m/s^2.
Plug these values into the equation for potential energy:
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Answer: 822 J