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3 years ago

If the forces on an object are balanced the resultant force is equal to zero true false

Physics

1 answer:

nordsb [41]3 years ago

4 0

Answer:

If the forces are balanced, the resultant force is zero. If the forces on an object are unbalanced, this is what happens: a stationary object starts to move in the direction of the resultant force. a moving object changes speed and/or direction in the direction of the resultant force.

Explanation:

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Material A is less optically dense than material B. How can you tell from the diagram above?

zimovet [89]

You can tell because the line bends and the closer it is to horizontal or past horizontal it is more dense

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3 years ago

When light with a wavelength of 238 nm is incident on a certain metal surface, electrons are ejected with a maximum kinetic ener

erastova [34]

Answer:

The wavelength is 173 nm.

Explanation:

This kind of phenomenon is known as photoelectric effect, it occurs when photons of light inside the metal surface and if they have the right amount of energy electrons absorb it and got expelled from the metal as photo electrons. The maximum kinetic energy of that photo electrons is given by the expression:

$K_{max} =E_{photon} - \Phi$ (1)

With E the energy of the photon and Φ the work function of the material. The work function is a value characteristic of each material and is related with how much the electron is attached to the material, the energy of the photon is the Planck's constant (h= $6.63\times10^{-34}$ ) times the frequency of light ( $\nu$ ) , then (1) is:

$K_{max} =h\nu - \Phi$ (2)

The frequency of an electromagnetic wave is related with the wavelength ( $\lambda$ ) by:

$\nu=\frac{c}{\lambda}$ (3)

with c the velocity of light (c= $3.0\times10^{8}$ )

Using (3) on (2):

$K_{max} =\frac{hc}{\lambda} - \Phi$

Solving for $\Phi$ :

$\Phi=\frac{hc}{\lambda}-K_max=\frac{(6.63\times10^{-34})(3.0\times10^{8})}{238\times10^{-9}}-3.13\times10^{-19}$

$\Phi=5.23\times10^{-19} J$

That's the work function of the metal we're dealing. So now if we want to know the wavelength to obtain the double of the kinetic energy we use:

$2K_{max} =\frac{hc}{\lambda} - \Phi$

Solving for $\lambda$ :

$\lambda = \frac{hc}{2K_{max}+\Phi}=\frac{(6.63\times10^{-34})(3.0\times10^{8})}{2(3.13\times10^{-19})+5.23\times10^{-19}}=1.73\times10^{-7}$

$\lambda=173 nm$

3 0

4 years ago

A wave has a speed of 50m/sec if its frequency is 100 hz what's it's wavelength

Igoryamba

<span>A wave has a speed of 50m/sec. If its frequency is 100 hz, what's it's wavelength?</span>

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4 years ago

- 3000 J of work is done on a 2kg object over a distance of 10m. What is the force acting on the object?

SpyIntel [72]

The answer is B. 300N

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3 years ago

The following figures show four stages that occur during the formation of a one-solar-mass star. Rank these stages based on thei

Stolb23 [73]

Answer:

The four stages that occur during the formation of a one-solar-mass star are as follows:

Explanation:

The formation of the Red dwarf which is also one of the celestial entities inside the galaxies as, the formation of the more gradual body of the mixture of different gasses having a imaginable low temperature. As this whole process leads to the formation of the main sequence star.
When the different masses of the mixtures of the gases combines to form a very celestial body then it leads to the composition of each component inside the celestial body to acquire a very flattened form of structure leading to the flattened disk with radiation properties. As the Protostar with jets is formed which means that still the star is in the process of collecting the right amount of materials for its bodily development.
The star formation does take a very swift form of development when all the required number of factors are there to satisfy the formation of the star, as these star nurseries are able to collect the right level or optimum amount of energy for its formation.As, these contracting cloud trapping the infrared light or radiation inside it.
Now, after the different conditions and terms for the formation of the star are satisfied then the mass or shape which the different components of the star body takes place is the molecular cloud fragment.

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4 years ago