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fredd [130]
3 years ago
12

Two moving objects collide and move apart on paths 90 degrees apart. The total momentum after the collision is _______ the total

momentum before the collision.
A. Equal to

B. Greater than

C. The momentum of the body is zero

D. The momentum of the body is increasing

Please help, thanks!
Physics
1 answer:
Tom [10]3 years ago
4 0
A is the correct answer
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How is photon energy calculated? (choose 2)
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Answer:

Explanation:

Based on the wave model of light, physicists predicted that increasing light amplitude would increase the kinetic energy of emitted photoelectrons, while increasing the frequency would increase measured current.

Contrary to the predictions, experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons, and increasing the light amplitude increased the current.

Based on these findings, Einstein proposed that light behaved like a stream of particles called photons with an energy of \text{E}=h\nuE=hνstart text, E, end text, equals, h, \nu.

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The energy of the incident photon must be equal to the sum of the metal's work function and the photoelectron kinetic energy:

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30. Light has been described as a ___ and a ___
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Answer:

Explanation: light has been described as a particle and a wave

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In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the
sp2606 [1]
  <span>I'll tell you how to do it but you must crunch the numbers. 

Use Kepler's 3rd Law 

T^2 = k R^3 

where k = 4(pi)^2/ GM 
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a) 
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3 years ago
A toy car is moving along with 0. 50 joules of kinetic energy. If its speed is doubled, then its new kinetic energy is.
antoniya [11.8K]

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2 years ago
If the charges attracting each other in the preceding problem have equal magnitudes,show that the magnitude of each charge is 2.
Schach [20]

Answer:

The magnitude of each charge is 2.82\times10^{-6}\ C

Explanation:

Suppose the two point charges are separated by 6 cm. The attractive force between them is 20 N.

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F=\dfrac{kq^2}{r^2}

Where, q = charge

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Put the value into the formula

20=\dfrac{9\times10^{9}\times q^2}{(6\times10^{-2})^2}

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Hence, The magnitude of each charge is 2.82\times10^{-6}\ C

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