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almond37 [142]
3 years ago
13

A ball rolls down a hill with a constant acceleration of 3.0 m/s.

Physics
1 answer:
lions [1.4K]3 years ago
5 0
Starting velocity (u) =0
acceleration (a) = 3
time (t) = 4
final velocity (v) =?

v=at+u
v=3(4)+0
v=12m/s2

distance (s) =?
s=0.5(u+v)(t)
s=0.5(0+12)3
s=18m
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Temperature can be described as ________
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What is the maximum kinetic energy of electrons ejected from barium when illuminated by white light, to 750 nm?
Ugo [173]

Answer:

1.0045\times10^{-19} J

Explanation:

The complete statement is given as

What is the maximum kinetic energy of electrons ejected from barium (Wo = 2.48 eV) when illuminated by white light, 400 nm to 750 nm ?

\lambda = wavelength of the white light = 400 nm = 400 x 10⁻⁹ m

c = speed of white light = 3 x 10⁸ ms⁻¹

Energy of the white light is given as

E = \frac{hc}{\lambda} = \frac{(6.63\times10^{-34})(3\times10^{8})}{400\times10^{-9}}\\E = 4.9725\times10^{-19} J

W_{o} = Work function of barium = 2.48 eV = 2.48 x 1.6 x 10⁻¹⁹ J

K = Maximum kinetic energy

Using photoelectric equation we have

E = W_{o} + K\\4.9725\times10^{-19} = 2.48\times1.6\times10^{-19} + K\\K = 1.0045\times10^{-19} J

3 0
3 years ago
What is the number “4” in SiCl4? a subscript a coefficient a product a reactant
Svetlanka [38]

Answer: 4 is the subscript in SiCl_{4}.

Explanation:

We know that,

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Coefficient: Number of atom which is used in reaction.

For example: In 3SiCl_{4}, 3 is the coefficient of silicon tetra chloride.

A Product : In the balance equation, right hand side is called product.

A reactant : In the balance equation, left hand side is called reactant.

For example: the balance equation is

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andreev551 [17]

\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}

Actually Welcome to the concept of Efficiency.

Here we can see that, the Input work is given as 2.2 x 10^7 J and the efficiency is given as 22%

The efficiency is => 22% => 22/100.

so we get as,

E = W(output) /W(input)

hence, W(output) = E x W(input)

so we get as,

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hence, W(output) = 4.84 x 10^6 J

The useful work done on the mass is 4.84 x 10^6 J

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