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postnew [5]
3 years ago
9

Calculate the speed of an object that travels 75m in 15s

Physics
1 answer:
vodka [1.7K]3 years ago
6 0

Answer:

speed =distance/time taken

5 m/s

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The power output of a laser is measured by its wattage, the number of joules of energy it radiates per second (1 W = 1 J s-1). A
viva [34]

Explanation:

It is given that,

Wavelength of red light, \lambda=676.4\ nm=676.4\times 10^{-9}\ m

Power of the laser, P=300\ mW=0.3\ W

(a) The energy carried by each photon is given by :

E=\dfrac{hc}{\lambda}

E=\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{676.4\times 10^{-9}}  

E=2.94\times 10^{-19}\ J

(b) Let n is the number of photons emitted by the laser per second. It can be calculated as :

n=\dfrac{Power}{Energy\ of\ one\ photon}

n=\dfrac{0.3}{2.94\times 10^{-19}}      

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Hence, this is the required solution.    

7 0
3 years ago
the resistivity of gold is 2.44×10−8Ω⋅m at room temperature. A gold wire that is 0.9 mm in diameter and 14 cm long carries a cur
cricket20 [7]

Answer:

0.03605 V/m is the electric field in the gold wire.

Explanation:

Resistivity of the gold = \rho = 2.44\times 10^{-8} \Omega.m

Length of the gold wire = L = 14 cm = 0.14 m ( 1 cm = 0.01 m)

Diameter of the wire = d = 0.9 mm

Radius of the wire = r = 0.5 d = 0.5 × 0.9 mm = 0.45 mm = 0.45\times 0.001 m

( 1mm = 0.001 m)

Area of the cross-section = A=\pi r^2=\pi r^(0.45\times 0.001 m)^2

Resistance of the wire = R

Current in the gold wire = 940 mA = 0.940 A ( 1 mA = 0.001 A)

R=\rho\times \frac{L}{A}

V(voltage)=I(current)\times R(Resistance) ( Ohm's law)

\frac{V}{I}=\rho\times \frac{L}{A}

We know, Electric field is given by :

E=\frac{dV}{dr}

E=\frac{V}{L}

E=\frac{V}{L}=\rho\times \frac{I}{A}

E=2.44\times 10^{-8} \Omega.m\times \frac{0.940 A}{\pi r^(0.45\times 0.001 m)^2}=0.03605 V/m

0.03605 V/m is the electric field in the gold wire.

3 0
4 years ago
What is the definition of magnitude?
Margarita [4]

<em>T</em><em>he great size or extent of something. </em>

<em></em>

8 0
3 years ago
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The planet Jupiter has an acceleration due to gravity that is approximately 2.4 times as much as the earth (23.2 m s2 ). Which o
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On Jupiter, C. your weight would increase by a factor of 2.4 . Weight is a product of mass and gravity. Mass does not change dependent upon location.

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A surgeon makes an incision that divides the patient's abdomen into superior
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Answer:

B. Oblique

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Hope this helps

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