1. A vector is a unit vector if its magnitude is 1. Given
and are unit vectors, while is not, since
2. Given some vector , you can get the unit vector in the same direction as
If
then the unit vectors in the direction of and , respectively, are
3.
Answer: E) all of the above
Explanation:
Frequency is the number of vibrations in one second. It is also defined as the number of crests that pass a point in a given time.
The frequency and the wavelength has an inverse relationship.
Frequency is measured in cycles per second or Hertz(Hz).
The relationship between wavelength and frequency of the wave follows the equation:
where,
= frequency of the wave
c = speed of light
= wavelength of the wave
Thus all the given statements are true.
Friction is the force exerted when 2 (or more) objects rub up against each other.
Answer:
The initial velocity of the gymnast is 8.5 m/s.
Explanation:
We can use the kinematic equation
to figure out the initial velocity of the gymnast.
Now, when the gymnast reaches the maximum height, the distance he has traveled is , and his velocity is zero; therefore .
Thus, we have
Answer:
8.533 %
Explanation:
Energy of the electron is given by where e is charge of electron and V is the potential difference, this energy will accelerate the electron and so this energy will be converted into kinetic energy
So
Here V is the potential difference which is given as 1878.7197 V
m is the mass of electron
Charge of electron
Putting all these value in expression of velocity
Speed of the light c =
So required percentage