The energy of a given wave in the electromagnetic spectrum is 2.64 × 10-21 joules, and the value of Planck's constant is 6.6 × 10-34 joule·seconds. What is the value of the frequency of the wave?

Answer:

Acceleration.

Explanation:

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

[tex]a = \frac{v - u}{t}[/tex]

Where,

a is acceleration measured in [tex]ms^{-2}[/tex]

v and u is final and initial velocity respectively, measured in [tex]ms^{-1}[/tex]

t is time measured in seconds.

The S.I unit for measuring acceleration is meters per seconds square (m/s²).

Hence, 10 m/s^2 is an example of acceleration.

Answer:

v = 14.5 m/s

Explanation:

The Principle Of Conservation Of Mechanical Energy

In the absence of friction, the total mechanical energy is conserved. That means that

Em=U+K is constant, being U the potential energy and K the kinetic energy

U=mgh

[tex]\displaystyle K=\frac{mv^2}{2}[/tex]

The ball with a mass of m=0.8 kg is thrown straight upward from the zero height reference (h=0) and with some speed (v). The potential energy is zero, but the kinetic speed is given by the equation above.

When the ball reaches its maximum height of h=10.7 m, the speed is zero and all the initial kinetic energy was transformed into potential energy, thus:

[tex]\displaystyle \frac{mv^2}{2}=mgh[/tex]

Simplifying by m:

[tex]\displaystyle \frac{v^2}{2}=gh[/tex]

Solving for v:

[tex]\displaystyle v=\sqrt{2gh}[/tex]

Substituting:

[tex]\displaystyle v=\sqrt{2*9.8*10.7}[/tex]

Calculating:

v = 14.5 m/s

Answer:

Pressure = 14.71N/m²

Explanation:

Given the following data;

Force = 375N

Area = 25.5m²

To find the pressure;

Pressure = force/area

Pressure = 375/25.5

Pressure = 14.71N/m²

Therefore, the amount of pressure that is being exerted by blood cells is 14.71 Newton per meter square.

Answer:

18.78 m/s.

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 50 kg

Initial velocity (u) = 0 m/s

Height (h) of cliff = 18 m

Acceleration due to gravity (g) = 9.8 m/s²

Final velocity (v) =?

The velocity with which the diver reach the water can be obtained as follow:

v² = u² + 2gh

v² = 0² + (2 × 9.8 × 18

v² = 0 + 352.8

v² = 352.8

Take the square root of both side

v = √352.8

v = 18.78 m/s

Thus, the diver will reach the water with a velocity of 18.78 m/s.