What would happen to a moving object if no unbalanced force acts upon it? Help please?

Physics

1 answer:

Kisachek [45]3 years ago

7 0

Answer:

Explanation:

if no force acts upon it it will just continue moving

hope this helps!! have a wonderfull day!

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Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of 1.45 eV. What is the work functio

Bess [88]

Answer:

W = 3.73 eV

Explanation:

Given data:

wavelength of photons 240 nm

kinetic energy 1.45 eV

B y using photoelectric equation

Kinetic Energy = Photon Energy - work friction

$K.E = \frac{hc}{\lambda} -W$

$\frac{hc}{\lambda} = \frac{6.63\times 10^{-34}\times 3\times 10^8}{240\times 10^{-9}\times 1.6\times 10^{-19}} eV$

= 5.179 eV

= 5.18 eV $W = \frac{hc}{\lambda} - K.E$

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Answer:

Explanation:

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Impulse = change in momentum

change in momentum in the ball will be maximum when the ball bounces back with the same velocity which can be shown as follows

change in momentum = mv - ( - mv ) = 2mv

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3 years ago

A sprinter starts from rest and reaches a speed of 15 m/s in 4.25 s. Find his acceleration

kakasveta [241]

Answer:

a=3.53 m/s^2

Explanation:

Vo=0 m/s (because he is not moving at the start)

V1=15 m/s

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