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otez555 [7]
3 years ago
14

Let f be a scalar field and F be a vector field. The following expressions either represent scalar fields, vector fields, or are

completely meaningless. Determine which of the three applies to each expression and briefly explain why.
(a) curl f
(b) Δf
(c) divF
(d) curl(Δf)
(e) ΔF
(f) Δ(divF)
(g) div(Δf)
(h) Δ(div f)
(i) curl(curlF)
(j) div(divF)
(k) (Δf) x (divF)
(l) div(curl(Δf))

Δ should be upside down as for a gradient sign. Thanks for any help you give! No need for in depth explanation, but it would help if you put a couple words down for how you got an answer.

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Mathematics
1 answer:
Mama L [17]3 years ago
5 0

Answer:

(a) curl f - meaningless

(b) grad f -Δf- vector field

(c) div F - scalar field

(d) curl( grad f )curl (Δf)- vector field (e) grad F -ΔF- meaningless

(f) grad( div F )-Δ(divF) - vector field

(g) div( grad f ) - div(Δf)- scalar field

(h) grad ( div f ) -Δ(div f)-meaningless

(i) curl ( curl F ) - vector field

(j) div( div F ) - meaningless

(k) ( grad f ) x ( div F ) -(Δf) x (divF)-meaningless

(l) div( curl( grad f )) -div(curl(Δf))-scalar field

Step-by-step explanation:

(a) curl f - meaningless; a curl can only be taken of a vector field

(b) grad f - vector field; a gradient results in a vector field

(c) div F - scalar field; a divergence results in a scalar field

(d) curl( grad f ) - vector field; the curl of a vector field results in a vector field

(e) grad F - meaningless; a gradient can only be taken of a scalar field

(f) grad( div F ) -vector field ; the gradient of a scalar field is a vector field

(g) div( grad f ) - scalar field; the divergence of a vector field is a scalar field

(h) grad ( div f ) - meaningless; the divergence of a scalar field can not be taken

(i) curl ( curl F ) - vector field; the curl of a vector field is a vector field

(j) div( div F ) - meaningless; the divergence of a scalar field can not be taken

(k) ( grad f ) x ( div F ) - meaningless; a vector and scalar field cannon be crossed

(l) div( curl( grad f )) - scalar field; the divergence of a vector field is a scalar field

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Answer:

The information given in the question to solve it is insufficient.

The complete question related to this found at GMAT club forum is stated below:

Steve works at an apple orchard and is paid by the bushel for the apples he harvests each day. For the first 42 bushels Steve harvests each day, he is paid y dollars per bushel. For each additional bushel over 42, he is paid 1.5y. How many bushels of apples did Steve harvest yesterday?

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2. Today, Steve was paid $240, and he harvested 10 more bushels of apples than he harvested yesterday.

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1st 42 bushels Steve harvests each day:

Payment of 1 bushel = y dollar

Payment of ≤ 42 bushel = 42× y = $42y

Payment for Additional bushel after the 1st 42 bushels = 1.5y per bushel

Yesterday's Payment = $180

Today's payment = $240

Let the total number Steve harvested yesterday = p

Today he harvested 10 more bushels than he did yesterday

Total number Steve harvested today = p + 10

Now looking at the information in the question:

First statement did not tell us the amount he harvested that got him that pay, so it's insufficient. Second statement alone two is not sufficient to determine yesterdays pay.

In both statement, we were not told if he harvested more or less than 42 yesterday. Neither were we told if the additional 10 bushels was after he had harvested more than 42 bushels.

Let's assume the additional 10 bushels was after he had harvested more than 42 bushels (that is he harvested 42 yesterday) .

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For the additional 10bushels, he was paid $60

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If y = $4 per bushel and he was paid $180, the number he harvested will be:

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Thus the information given in the question to solve it is insufficient.

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