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Julli [10]
3 years ago
15

What is force?????? ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀​

Physics
1 answer:
8090 [49]3 years ago
6 0

Answer:

Force is an external agency that change or tends to change the position of a body

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A 6.7 kg object moves with a velocity of 8 m/s. what is its kinetic energy
blagie [28]

The Correct answer to this question for Penn Foster Students is: 214.4 J

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3 years ago
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A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm
PSYCHO15rus [73]

Explanation:

Given that,

Initial speed of the billiard ball 1, u = 30i cm/s

Initial speed of another billiard ball 2, u' = 40j cm/s

After the collision,

Final speed of first ball, v = 50 cm/s

Final speed of second ball, v' = 0 (as it stops)

Let us consider that both balls have same mass i.e. m

Initial kinetic energy of the system is :

K_i=\dfrac{1}{2}mu^2+\dfrac{1}{2}mu'^2\\\\K_i=\dfrac{1}{2}m(u^2+u'^2)\\\\K_i=\dfrac{1}{2}m((30)^2+(40)^2)\\\\K_i=1250m\ J

Final kinetic energy of the system is :

K_f=\dfrac{1}{2}mv^2+\dfrac{1}{2}mv'^2\\\\K_f=\dfrac{1}{2}m(v^2+v'^2)\\\\K_f=\dfrac{1}{2}m((50)^2+(0)^2)\\\\K_f=1250m\ J

The change in kinetic energy of the system is equal to the difference of final and initial kinetic energy as :

\Delta K=K_f-K_i\\\\\Delta K=1250m-1250m\\\\\Delta K=0

So, the change in kinetic energy of the system as a result of the collision is equal to 0.    

7 0
4 years ago
The main explanation for why heat pumps work is the ________ law of thermodynamics. Zeroth First Second
kondor19780726 [428]

Zeroth Law of thermodinamics

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4 years ago
Which device converts kinetic energy into electrical energy?
Sergeu [11.5K]

Answer:

electric generator

Explanation:

8 0
3 years ago
The Electrons in a beam are moving at 2.7x108 m/s in an electric field of 16000 N/C. What value must the magnetic field have if
kozerog [31]

Answer:

B = 0.07 mT

Explanation:

q = 1.6x10^-19 coulombs

for the electron to pass through the field undeflected the magnetic force acting on it must equal the electrical force due to the electric field

electric force = Eq = 16000 * 1.6x10^-19 newtons

magnetic force = qvB = 1.6x10^-19 * 2.7x10^8 * B

16000 * 1.6x10^-19 = 1.6x10^-19 * 2.7x10^8 * B

B = 0.07 mT (milli tesla)

8 0
3 years ago
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