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bulgar [2K]
3 years ago
7

The total kinetic energy of an object depends on two (2) factors. Select those factors from the list below.

Physics
1 answer:
alexandr402 [8]3 years ago
7 0
The two factors of kinetic energy is mass and velocity :)
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What are the wavelengths of electromagnetic wave in free space that have the following frequencies?
Ne4ueva [31]

Explanation:

Given that,

(a) Frequency, f_1=4\times 10^{19}\ Hz

All electromagnetic wave moves with the speed of light. It is given by :

c=f\lambda

\lambda_1=\dfrac{c}{f_1}\\\\\lambda_1=\dfrac{3\times 10^8}{4\times 10^{19}}\\\\\lambda_1=7.5\times 10^{-12}

(b) Frequency, f_2=5.5\times 10^{1=9}\ Hz

All electromagnetic wave moves with the speed of light. It is given by :

c=f\lambda

\lambda_2=\dfrac{c}{f_2}\\\\\lambda_2=\dfrac{3\times 10^8}{5.5\times 10^{9}}\\\\\lambda_2=0.054\ m

Hence, this is the required solution.

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Based on the second law of thermodynamics, how would you expect a system to change over time?
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3 years ago
Work done of frictional force from instant ​
Liono4ka [1.6K]

Answer:

  • -100\ J

Step-by-step explanation:

<u>1. Find acceleration:</u>

  • m=2\ kg
  • F=-5\ N
  • a=\frac{F}{m}  (Newton's second law)
  • a=\frac{-5}{2} =-2.5\ \frac{m}{s^{2}}

<u>2. Find distance traveled:</u>

  • v_0=10\ \frac{m}{s}
  • v=0
  • a=-2.5\ \frac{m}{s^{2} }
  • v^2-v_0^2=2ad (Kinematic equation)
  • -100=-5d
  • d=20\ m

3. Find work done by friction:

  • W=Fd (Work formula when angle between Force and Displacement vectors are 0°)
  • W=-5\times20=-100\ J
4 0
4 years ago
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