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4 years ago

A material that transmits nearly all the light in a ray because it offers little resistance to the light is

2 answers:

8 0

A material that transmits nearly all the light that strikes it
is described as being "transparent", but that has nothing
to do with "resistance to the light", whatever that is.

Even the blackest, densest material, like wood, foil, or concrete,
has no "resistance" to light. It simply absorbs light that enters it,
so some or all of the light that went in one side never made it to
the other side.

Transparent material absorbs very little, so almost all of the
light that goes in one side comes out the other side.

Ad libitum [116K]4 years ago

5 0

Penn Foster Students: Transparent

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A cell membrane is 0,0000005 m thick and has an electric potential difference between its surfaces of 0,10 V. What is the electr

Irina-Kira [14]

Answer:

Electric field in the membrane is given as

$E = 2 \times 10^5 V/m$

Explanation:

As we know that electric field in a region is related to its potential difference given by the formula

$E = \frac{\Delta V}{\Delta x}$

here we know that

$\Delta V = 0.10 V$

$\Delta x = 0.0000005 m$

so we have

$E = \frac{0.10}{0.0000005}$

$E = 2 \times 10^5 V/m$

5 0

4 years ago

Randall is 140 miles away from Gregory. They are traveling towards each other. If Gregory travels 4 mph faster than Randall and

mote1985 [20]

Answer:

8 mph, 12 mph

Explanation:

t = Time taken = 7 hours

x = Speed of Randall

x+4 = Speed of Gregory

The distance they both will travel together is 140 miles if they start at the same time.

$Distance=Speed\times time$

$(x+4)t+xt=140\\\Rightarrow (x+4)7+7x=140\\\Rightarrow 7x+28+7x=140\\\Rightarrow 28+14x=140\\\Rightarrow x=\dfrac{140-28}{14}\\\Rightarrow x=8\ mph$

The speed of Randall is 8 mph

The speed of Gregory is 8+4 = 12 mph

5 0

4 years ago

What are the SI base units and their definitions?

MariettaO [177]

Answer:

There are 7 of them

Explanation:

Meter- The meter, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of ΔνCs.

Kilogram -The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10-34 when expressed in the unit J s, which is equal to kg m2 s-1, where the meter and the second are defined in terms of c and ΔνCs.

Second - The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the cesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.

Ampere- The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 x 10-19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of ΔνCs.

Kelvin- The kelvin, symbol K, is the SI unit of thermodynamic temperature. It is defined by taking the fixed numerical value of the Boltzmann constant k to be 1.380 649 x 10-23 when expressed in the unit J K-1, which is equal to kg m2 s-2 K-1, where the kilogram, meter and second are defined in terms of h, c and ΔνCs.

Mole -The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 x 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit mol-1 and is called the Avogadro number. The amount of substance, symbol n, of a system is a measure of the number of specified elementary entities. An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles.

Candela- The candela, symbol cd, is the SI unit of luminous intensity in a given direction. It is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 x 1012 Hz, Kcd, to be 683 when expressed in the unit lm W-1, which is equal to cd sr W-1, or cd sr kg-1 m-2 s3, where the kilogram, meter and second are defined in terms of h, c and ΔνCs.

3 0

3 years ago

when you make an inference what needs to be in the text in the order for you to be able to accomplish this

cluponka [151]

Answer:

To make an inference what needs to be in the text in the order for you is explained below in complete details.

Explanation:

Making an inference requires using what you recognize to guess what you don't understand or understanding between the series. Scholars who make inferences use the evidence in the text along with their own practices to encourage them to figure out what is not straight said, making the text special and remarkable.

8 0

3 years ago

In which direction is energy transferred as heat between two objects at different temperatures

Black_prince [1.1K]

Answer:

From the object at higher temperature to the object at lower temperature

Explanation:

Heat corresponds to the transfer of thermal energy between two objects. Temperature gives a measure of "how much thermal energy an object has": the higher the temperature, the faster the molecules inside the object, the more thermal energy the object has. Therefore, an object at higher temperature has more thermal energy than an object at lower temperature, so the transfer of heat goes from the object at higher temperature to the object at lower temperature.

4 0

4 years ago