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2 years ago

What is a specific heat capacity?

2 answers:

7 0

The heat capacity of a material is a physical property defined as the quantity of heat to be supplied to a given mass of a material in order to alter the temperature of the unit. Joule per kelvin is the SI unit of heat power.
Hope this helps :)

scZoUnD [109]2 years ago

5 0

Answer:

Specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kilogram of a substance by 1 kelvin (SI unit of specific heat capacity J kg−1 K−1).

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A person is nearsighted with a far point of 75.0 cm. a. What focal length contact lens is needed to give him normal vision

BigorU [14]

Complete Question

The complete question is shown on the first uploaded image

Answer:

$f= -75 \ cm = - 0.75 \ m$

$P = -1.33 \ diopters$

Explanation:

From the question we are told that

The image distance is $d_i = -75 cm$

The value of the image is negative because it is on the same side with the corrective glasses

The object distance is $d_o = \infty$

The reason object distance is because the object father than it being picture by the eye

General focal length is mathematically represented as

$\frac{1}{f} = \frac{1}{d_i} - \frac{1}{d_o}$

substituting values

$\frac{1}{f} = \frac{1}{-75} - \frac{1}{\infty}$

=> $f= -75 \ cm = - 0.75 \ m$

Generally the power of the corrective lens is mathematically represented as

$P = \frac{1}{f}$

substituting values

$P = \frac{1}{-0.75}$

$P = -1.33 \ diopters$

7 0

3 years ago

Define an expression for linear expansion of solid

Vesnalui [34]

$\huge \tt \underline \red{answer}$

When something is heated or cooled, its length changes by an amount proportional to the original length and the change in temperature: linear expansion : ΔL=αL0ΔT (α is the coefficient of linear expansion) The coefficient of linear expansion depends only on the material an object is made from.

Thanku have a great day ✨❤️

4 0

3 years ago

A block of inertia m is placed on an inclined plane that makes an angle θ with the horizontal. The block is given a shove direct

Wittaler [7]

Answer:

A) d = v² / (2g (μ cos θ + syn θ) B) μ = tan θ

Explanation:

Part A

We can work this part with the work and energy theorem, where the work of the friction forces is equal to the energy change of the system.

The work is

W = fr .d

With the force of friction it opposes the movement

W = - fr d

The energy at the lowest point is

Em₀ = K = ½ m v²

The energy at the highest point

$Em_{f}$ = U = m g y

The height (y) can be found by trigonometry

sin θ = y / d

y = d sin θ

W = $Em_{f}$ –Em₀

-fr d = mg d sin θ - ½ m v²

The equation for the force of friction is

fr = μ N

From Newton's second law

N - W cos Te = 0

We replace

-μ (mg cos θ) d - mg d sin θ = - ½ m v²

d g (μ cos θ + sin θ) = ½ v²

d = v² / (2g (μ cos θ + syn θ)

Part B

The block is stopped, what is the Angle tet, let's use Newton's second law

fr - W sin θ = 0 ⇒ fr = W sin θ

N - W cos θ= 0 ⇒ N = w cos θ

fr = μ N

μ (mg cos θ) = mg syn θ

μ = syn θ / cos θ

μ = tan θ

7 0

3 years ago

What is the formula of a compound formed between strontium (Sr) and chlorine (Cl)? (2 points)

Sidana [21]

The chemical formula of the compound of strontium and chlorine would be SrCl2. It is a salt of the strontium ion and chloride ion and a white crystalline compound. When burned, it produces a bright red hue. That is why it found some application in fireworks.
Read more on Brainly - brainly.com/sf/question/4154091

8 0

3 years ago

Mess up my notes part 2 00:01:40And the white snapdragon will have the genotype small r and small r. Now, when the alleles combi

Semmy [17]

Answer:

I dont get what your asking. If u explaint to me what your asking ill tell you the answer in the comments.

Explanation:

8 0

2 years ago