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3 years ago

Difference between kinetic energy and potential energy(please i need answer in 2minutes

Physics

1 answer:

kirill [66]3 years ago

6 0

Answer:

Energy stored in an object due to its position is Potential Energy. Energy that a moving object has due to its motion is Kinetic Energy.

Explanation:

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Two insulated copper wires of similar overall diameter have very different interiors. One wire possesses a solid core of copper,

balandron [24]

Answer with Explanation:

We are given that

Radius of solid core wire=r=2.28 mm= $2.28\times 10^{-3} m$

$1mm=10^{-3} m$

Radius of each strand of thin wire=r'=0.456 mm= $0.456\times 10^{-3} m$

Current density of each wire= $J=3750 A/m^2$

a.Area = $\pi r^2$

Where $\pi=3.14$

Using the formula

Cross section area of copper wire has solid core = $3.14\times (2.28\times 10^{-3})^2=16.3\times 10^{-6} m^2$

Current density = $J=\frac{I}{A}$

Using the formula

$3750=\frac{I}{16.3\times 10^{-6}}$

$I=3750\times 16.3\times 10^{-6}=0.061 A$

Total number of strands=19

Area of strand wire= $A'=19\times 3.14\times (0.456\times 10^{-3})^2=12.4\times 10^{-6} m^2$

$J'=\frac{I'}{A'}$

$3750=\frac{I'}{19\times 3.14(0.456\times 10^{-3})^2}$

$I'=3750\times 19\times 3.14(0.456\times 10^{-3})^2$

$I'=0.047 A$

b.Resistivity of copper wire= $\rho=1.69\times 10^{-8}\Omega-m$

Length of each wire =6.25 m

Resistance, R= $\frac{\rho l}{A}$

Using the formula

Resistance of solid core wire= $R=\frac{1.69\times 10^{-8}\times 6.25}{16.3\times 10^{-6}}=6.5\times 10^{-3}\Omega$

Resistance of strand wire= $R'=\frac{1.69\times 10^{-8}\times 6.25}{12.4\times 10^{-6}}=8.5\times 10^{-3}\Omega$

7 0

3 years ago

(a) Suppose a meter stick made of steel and one made of invar are the same length at 0°C. What is their difference in length at

dem82 [27]

Explanation:

Given that,

Initial temperature $T_{i}=0^{\circ}C$

Final temperature $T_{f}=48.0^{\circ}C$

Length = 34.0 m

We know that,

Coefficient of linear expansion of Invar is

$\alpha=0.9\times10^{-6}/^{\circ}C$

Coefficient of linear expansion of steel is

$\alpha=12\times10^{-6}/^{\circ}C$

We need to calculate the temperature difference is

$\Delta T=T_{f}-T_{i}$

$\Delta T=48.0-0$

$\Delta T=48.0^{\circ}C$

We need to calculate the change in length of Invar

Using formula of change in length

$\Delta l=l\times\alpha\times\Delta t$

Put the value into the formula

$\Delta l=34\times0.9\times10^{-6}\times48.0$

$\Delta l=0.0014688=1.47\times10^{-3}\ m$

$\Delta l= 1.47\ mm$

We need to calculate the change in length of steel

$\Delta l'=34\times12\times10^{-6}\times48.0$

$\Delta l'=0.019584=19.59\times10^{-3}\ m$

$\Delta l'=19.59\ mm$

Difference in length of two 34.0 m

Long surveyor's tapes is

$\Delta L=\Delta l'-\Delta l$

Put the value into the formula

$\Delta L=19.59-1.47=18.12\ mm$

The difference in length is 18.12 mm.

Hence, This is the required solution.

6 0

3 years ago

Planetesmals are made from

OLga [1]

A planetesimal is an object formed from dust, rock, and other materials. According to the planetesimal hypothesis, when a planetary system is forming, there is a protoplanetary disk with materials from the nebulae from which the system came. This material is gradually pulled together by gravity to form small chunks.

Brainliest or a thank you please :)) <3

5 0

3 years ago

At the beginning of 2016, robotics inc. acquired a manufacturing facility for $13.1 million. $10.1 million of the purchase price

ki77a [65]

$ 376153 is depreciation on the building for 2018.

<u>Explanation:</u>

Given data:

Original cost = $13.1 million

Residual value = $2.1 million

Useful life = 20 -year

Depreciation on the building for 2016 = $=\frac{\text {original cost-residual value}}{\text { Useful life }}$

By substituting the given values, we get,

$=\frac{(\$ 13.1 \text { million }-\$ 2.1\text { million) } }{20 \text { years }}=\frac{11.1 \text { million }}{20 \text { years }}$ = 5500000

Depreciation for 2016 $5500000

Depreciation for 2017 $5500000

Depreciation at Dec 31, 2017 $ 5500000

In 2018, the estimates of useful life and residual value were changed to 15 years and $610000, but 2 yrs have already passed, so there're 13 more yrs to go.

Depreciation on the building for 2018,

$=\frac{\text { book value at the end of } 2016-\text {residual value}}{\text { useful life }}$

= $=\frac{\$ 5500000-\$ 610000}{13}=\frac{4890000}{13}=\$ 376153$

4 0

3 years ago

Gina was summarizing what she read to her friends and shared this image, calling it a digital signal. Is she correct in saying t

fredd [130]

The image shows a continuous signal and is not made of numbers, so this signal is an analog signal. Gina is not correct in her identification of the signal.

6 0

3 years ago

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Difference between kinetic energy and potential energy(please i need answer in 2minutes​

Difference between kinetic energy and potential energy(please i need answer in 2minutes