6. Kinetic energy depends upon<br> and the<br> of the object

A body of mass 2 kilograms moves on a circle of radius 3 meters, making one revolution every 5 seconds. Find the magnitude of th

harkovskaia [24]

Answer: $F_c=9.375 N$

Explanation:

Given

mass of body $m=2 kg$

radius of circle $r=3 m$

Time Period $T=5 s$

suppose $\omega$ is the angular velocity of revolution

therefore $\omega T=2\pi$

$\omega =\frac{2\pi }{5}=1.25 rad/s$

Centripetal acceleration $a_c=\omega ^r$

$a_c=1.25^2\times 3$

$a_c=4.68 m/s^2$

therefore centripetal $F_c=m\omega ^2\times r$

$F_c=9.375 N$

7 0

3 years ago

A beam of light traveling in air strikes a slab of transparent material. The incident beam makes an angle of 40° with the normal

Molodets [167]

Answer:

V = 2.05× 10⁸ m/s

Explanation:

We are given;

The angle of the incidence; i = 40°

Angle of refraction; (r) = 26°

For us to find the speed of light in the material, we'll use Snell's law

From shell's law, we know that;

n = sin i/sin r = speed of light in air/Speed of light in the medium

Now, speed of light in air = 3 × 10⁸ m/s

Lets speed of light in medium be V

Thus, plugging in the relevant values to obtain;

Sin 40°/sin 26° = 3×10⁸/V

Let's make V the subject;

V = 3 × 10⁸× sin 26°/sin 40°

V = 2.05× 10⁸ m/s

7 0

3 years ago

Technician A says crimping solderless connections is the best method of splicing wires. Technician B says crimping should not be

algol13

Answer:

Technician b is correct.

Explanation:

Crimping cable allows a firm connection in mechanical terms and allows a low resistance path for the signal or the current flow, solder although it is better in terms of electrical conduction, can be impractical if the cable is subjected to excessive movement.

A crimped cable with excessive movement can also be easily broken at the ends, where it joins the part of the cable that is crimped, for this reason, a cable that is in excessive motion is recomended to be spliced by joining cable with cable .

In order to decide which metod is better for splicing cables its necessary to evaluate each situation separatly.

7 0

4 years ago

Calculate the wavelength (in nm) of light that produces its first minimum at an angle of 21.0° when falling on a single slit of

Cerrena [4.2K]

To solve this problem it is necessary to apply the related concepts to the principle of overlap, specifically to single slit diffraction experiment concept.

Mathematically this can be expressed as:

$dsin\theta = m\lambda$