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Jim S.'s Resources

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help with sound waves and light waves (answer)

1. No, sound waves are longitudinal pressure waves 2.yes because light made up of transverse electric and magnetic fields 3. yes a LASER is an example as  4. yes a trumpet or a pipe organ are examples 5. a. is the definition of an long. wave   Jim

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Differential Equations circuit homework problem (answer)

Allison,       There are 2 circuits, the one on the right is an RC circuit and the one in the left is an LCR circuit. If we start with the RC circuit and apply the loop theorem (conservation of energy) we get -iR-q/C=0 these are the voltage drops across the resistor and the...

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help with kilometers (answer)

1. average speed =dist/time =100/2 =50 km/h so the answer is b.     2.You are given that the care is driven at 25 km/h which is a constant speed so the answer is a.     3.You are given that he car is traveling in a circle so it's velocity (direction) is...

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help with inertia (answer)

The answers to both questions is c and is a result of no net force acting on the body. Jim

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what does varies indirectly mean in math? (answer)

When y varies directly with x, any increase in x will result in an increase in y. Examples are y=3x+7.    The converse is y varies inversely with x such as y=10/x where any increase in x results in a decrease in y.   Hope this clears it up.  ...

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graphing inequalities (answer)

Hi Karen,               The first inequality is just two vertical lines, one at x=30 and the other at x=80 any x in-between those lines is a solution.   The second inequality is incorrect, there should be a variable (either x or y) somewhere in...

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Identify the solution of the equation if any -2x-4y=1 and 12y=-6x-3 (answer)

Hi Laura,           The two equations -2x-4y=1, 12y=-6x-3 are actually only one equation. If you factor out a -3 from both sides of the second equation you get -2x-4y=1 which is the same as the first equation. So there is only one equation and 2 unknowns...

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renewable energy help (answer)

Hi       The answer to the first is b. inefficiency in general is because of processes that use some of the energy generated in a non productive way and usually wind up generating un useable heat.        The second is c. because garbage is a biomass.

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math comibantion or permutation question (answer)

Hi Kaelyn,          The way to see this is she has 7 choices for the first car now there are 6 left, so 6 choices for the second car and 5 for the third 4 for the fourth and 3 for the 5th. If you multiply 7*6*5*4*3 you get 2,520. This counts each ordering of the...

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Find the differential dy (answer)

dy=5*sec2(5x+6)dy   put x=4 and dx=.4 in the above and calculate. sec(θ)=1/cos(θ)   for the second part change dx from .4 to .8   Jim

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Using linear approximation find A and B (answer)

Dalia,           A series expansion of the function f(x) at x=0 is f(0)+xf'(0)+higher order terms. f'(0) is the first derivative of f(x) at x=0.      The linear expansion is just the first two terms and f(x)=√(8+8x) so f'(x)=(1/2*8)/√(8+8x)...

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