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Leto [7]
3 years ago
7

Jason is taking a physical exam and has to do push ups for sixty seconds. He does 30 pushups in the sixty seconds. Each push up

takes two seconds to complete. Two seconds represents...
Physics
1 answer:
Alexandra [31]3 years ago
8 0

Answer: 2 seconds is the unit rate.

Explanation:

We know that Jason does 30 pushups in 60 seconds at a constant rate, and we know that each push up takes 2 seconds.

then, we can write this as 30 pushups/60 seconds = (1/2) pushups per second.

Here, two seconds represents the time needed to do one pushup, is the unit rate (this means that we need 2 seconds to have a unit "one pushup")

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In a material for which o=5.0 S/m and e, =1 the electric field intensity is E- 250 sin 10" (V/m). Find the conduction and displa
Elodia [21]

Answer:

Explanation:

Given that:

The conductivity of the material \sigma = 5.0 s/m

The  \ relative  \ permittivity \  of \  the \  material {\varepsilon_r} = 1 ; &

The electric field intensity of the material E = 250 sin(10¹⁰ t) V/m

(a) The conduction current density ( J_c) = \sigma E

= 5.0 \times 250 \ sin ( 10^{10} \ t )

\mathbf{ = 1250 \ sin (10 ^{10} t ) \ A/m^2 }

(b)  Displacement  current density (J_d) = \varepsilon _d * \dfrac{\delta E}{\delta t}

Recall that:

\varepsilon _o  = 8.854 \times 10^{-12}

∴

(J_d) =  8.854 \times 10^{-12} \times \dfrac{d}{dt} \times  (250  \ sin \ (10^{10} \ t))

(J_d) = 8.854 \times 10^{-12} \times 250 \times 10^{10} \times \ cos \ (10^{10} \ t)

(J_d) = 22.135 \ cos \  10^{10} \ t \ A/m^2

(c) The frequency at which J_c  \  and  \  J_d will have the same magnitude is:

f = \dfrac{\sigma}{2 \pi \varepsilon_o \varepsilon_r}

By substitution

f = 18 \times 10^9 \times \dfrac{\sigma }{\varepsilon_r}

f = 18\times 10^9 \times \dfrac{5}{1 }

f = 90 GHz

5 0
3 years ago
How many grams of nitrogen gas are needed to produce 34 g of ammonia
scZoUnD [109]

Answer:

28 grams

Explanation:

The equation for the reaction is

3H(2) + N(2) -> 2NH(3)

Then we have.

The molar mass, M of ammonia is 17 g/mol.

34 grams of ammonia, NH3 then would be

34 g / 17 g/mol

= 2 moles

2 moles of ammonia will be obtained from

(2 * 1) / 2

​= 1 mole of nitrogen

The molar masses of nitrogen is 28 g/mol

2 moles of nitrogen corresponds to 1 * 28 = 28 grams.

7 0
4 years ago
QUESTION 45
Olin [163]
I do not know if it is correct but I think it is between B or C
3 0
3 years ago
What can one say for sure about element #99, Einsteinium (Es))? a) There's no such element! b) It is an alkali metal. c) It is r
Dmitrij [34]

Answer:

Option (C)

Explanation:

Einsteinium is an element of the periodic table grouped in the Actinide series, with atomic number 99. They are dense element and highly electro-positive. <u>They are highly radioactive</u>, i.e the atoms within the element are unstable and constantly decay until they reach a stable environment. It has 99 number of electrons and protons, 153 number of neutrons.

Due to its high radioactivity, they are health hazardous and can used in making nuclear weapons but their uses are very limited and unknown.

Thus, the correct answer is option (C).

8 0
4 years ago
Electrical charges were named by? Franklin, Gilbert , van de graaff
Daniel [21]

Answer:

franklin im pretty sure??

Explanation:

, Electrical engineering from Dr. B. C. Roy Engineering College, Durgapur (2019) In the 18th century, Benjamin Franklin in America tried experiments with charges. It was Franklin who named the two kinds of electricity

4 0
3 years ago
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