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3 years ago

Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)

Physics

1 answer:

qaws [65]3 years ago

4 0

Answer:

The bonds can shift because valence electrons are held loosely and more freely

Explanation:

Please give brainliest if you can,have a good day<3 :)

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If total (PE + KE) is considered

diamong [38]

The sum of Potential Energy and Kinetic Energy is called Mechanical Energy

3 0

4 years ago

Even though Alice visits the wishing well frequently and always tosses in a coin for good luck, none of her wishes have come tru

Lady_Fox [76]

Answer: 4.29 m/s

Explanation:

Given

Depth of the well, s = 8.23 m

Time taken to reach the well, t = 0.93 s

Speed of sound = 343 m/s

To solve this, we would be using one of l the laws of motion.

S = ut + 1/2gt², where

S = depth of the well

u = initial speed of toss

g = acceleration due to gravity

t = time taken to reach the well

We would then have

8.23 = 0.93 u + 1/2 * 9.8 * 0.93²

8.23 = 0.93 u + 4.9 * 0.8649

8.23 = 0.93 u + 4.23801

0.93 u = 8.23 - 4.23801

0.93 u = 3.99199

u = 3.99199 / 0.93

u = 4.29 m/s

Therefore, the initial speed of the coin is 4.29 m/s

3 0

3 years ago

A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW

Volgvan

Answer:

Option D 3.9

Explanation:

First, you need to use the correct equation which is the following:

COP = Q/W

Where:

Q = heat absorbed

W = work done by the pump

COP = coefficient of perfomance

We have all the data, so, all you need to do is replace in the above expression and you shoould get the correct result:

COP = 30 / 7.7

COP = 3.896

This result you can round it to 3.9. option D.

8 0

3 years ago

A coil of 1,000 turns encloses an area of 85 cm^2. It is rotated in 0.090 s from a position where its plane is perpendicular to

Maurinko [17]

Answer:

The average emf induced in the coil is $5.6\times10^{-3}\ mV$ .

Explanation:

Given that,

Number of turns = 1000 turns

Area = 85 cm²

Time = 0.090 s

Its plane is perpendicular to Earth's magnetic field.

Angle = 0°

Magnetic strength $B=6.0\times10^{-5}\ T$

We need to calculate the magnetic flux

Using formula of magnetic flux

$\phi=BA\cos\theta$

Put the value into the formula

$\phi=6.0\times10^{-5}\times85\times10^{-4}\times\cos0^{\circ}$

$\phi =6.0\times10^{-5}\times85\times10^{-4}\times1$

$\phi=5.1\times10^{-7}\ Wb$

We need to calculate the average emf induced in the coil

$\epsilon=\dfrac{d\phi}{dt}$

Put the value into the formula

$\epsilon=\dfrac{5.1\times10^{-7}}{0.090}$

$\epsilon=0.0000056\ N$

$\epsilon =5.6\times10^{-3}\ mV$

Hence, The average emf induced in the coil is $5.6\times10^{-3}\ mV$ .

3 0

3 years ago

A tuba creates a 4th harmonic of

xxTIMURxx [149]

Answer:

93.54 Hz

Explanation:

✓From the question, Number of harmonic frequency is 4

✓ the frequency (f₄ )= 116.5 Hz

✓harmonic frequency can be calculated using below expresion

fₙ = [ (nv)/4L]..........eqn(1)

v = speed of sound= 343 m/s

n = number of given harmonic frequency

L = Length of the rope

Using above expresion ,and substitute the values at (n=4) which is 4th harmonic frequency to find the " initial Lenght of the rope

fₙ = [ (nv)/4L]

f₄ = 4× 343 /4L

f₄ = 343 /L

L= 343 /f₄

But f₄= 116.5 Hz

L= 343/116.5= 2.944m

Hence, initial Lenght of the rope= 2.944m

We can determine the frequency of new length as ( initial Lenght of the rope + tubing Lenght)

= ( 2.944m + 0.721m )

= 3.667m

Hence, new length= 3.667m

To find the new frequency of the 4th harmonic we will use eqn(2)

f₄ = v/l ...............eqn(2)

From equation (2) If we substitute the values we have

f₄ = (343/3.667)

= 93.54 Hz

Hence, the the new frequency of the 4th harmonic is

93.54 Hz

4 0

3 years ago