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3 years ago

Hellp.....its physics

Physics

2 answers:

blondinia [14]3 years ago

4 0

Answer:

i know it

Explanation:

18.493 its the answer

brainliest pls

Sonbull [250]3 years ago

4 0

The answer = 7.12+8.333+3.4
=18.853m

I hope this was helpful (if it was pls mark as brainest)

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Calculate the frequencies corresponding to the wavelengths 500.00 nm and 500.10 nm. Use these to check the accuracy of equation

mel-nik [20]

Explanation:

It is given that,

Wavelength, $\lambda_1=500\ nm=5\times 10^{-7}\ m$

Wavelength, $\lambda_2=500.10\ nm=5.001\times 10^{-7}\ m$

We need to find the frequencies from corresponding wavelengths. The frequency of the light is given by :

$f=\dfrac{c}{\lambda}$

c is the speed of light

Frequency 1,

$f_1=\dfrac{c}{\lambda_1}$

$f_1=\dfrac{3\times 10^8\ m/s}{5\times 10^{-7}\ m}$

$f_1=6\times 10^{14}\ Hz$

Frequency 2,

$f_2=\dfrac{c}{\lambda_2}$

$f_1=\dfrac{3\times 10^8\ m/s}{5.001\times 10^{-7}\ m}$

$f_1=5.99\times 10^{14}\ Hz$

Hence, this is the required solution.

3 0

3 years ago

g 2. In a laboratory experiment on standing waves a string 3.0 ft long is attached to the prong of an electrically driven tuning

abruzzese [7]

Answer:

The tension in string will be "3.62 N".

Explanation:

The given values are:

Length of string:

l = 3 ft

or,

= 0.9144 m

frequency,

f = 60 Hz

Weight,

= 0.096 lb

or,

= 0.0435 kgm/s²

Now,

The mass will be:

= $\frac{0.0435}{9.8}$

= $0.0044 \ kg$

As we know,

⇒ $\lambda=\frac{2L}{n}$

On substituting the values, we get

⇒ $=\frac{2\times 0.9144}{4}$

⇒ $=0.4572 \ m$

or,

⇒ $v=f \lambda$

⇒ $=0.4572\times 60$

⇒ $=27.432 \ m/s$

Now,

⇒ $v=\sqrt{\frac{T}{\mu} }$

or,

⇒ $T=\frac{m}{l}\times v^2$

On putting the above given values, we get

⇒ $=\frac{0.0044}{0.9144}\times (27.432)^2$

⇒ $=\frac{752.51\times 0.0044}{0.9144}$

⇒ $=3.62 \ N$

7 0

3 years ago

ludmilkaskok [199]

Answer: W represents an element Y represents a mixture

Explanation: I just took a quiz on this and got it right. Good Luck

4 0

3 years ago

A 125 W motor accelerates a block along a level, frictionless surface at an average speed of 5.0

Lelu [443]

Answer:

25N

Explanation:

Given parameters:

Power of the motor = 125W

Average speed = 5m/s

Unknown:

Force supplied to the motor = ?

Solution:

Work done is the force applied to move a body through a particular distance;

Work done = Force x distance

Also,

Work done = Power x time

So;

Force x distance = Power x time

since force is the unknown;

Force = $\frac{Power x time}{distance}$

Speed = $\frac{distance }{time}$

Force = $\frac{Power}{speed}$

Now solve;

Force = $\frac{125}{5}$ = 25N

3 0

3 years ago

One way to conserve energy is to replace incandescent light bulbs with compact fluorescent bulbs. The fluorescent bulb typically

NemiM [27]

Answer:

cos to = $ 24

Explanation:

When replacing the bulb only 25% of the energy is used, therefore

W = 0.25 100

W = 25 W

Let's look for the energy in the life of the bulb

E = 25 10⁻³ 12000

E = 300 Kwh

now we can calculate the cost using a direct proportion rule.

Cost = 0.08 300

cos to = $ 24

4 0

3 years ago