a women is walking at a rate of 6 ft/sec across a bridge 40 ft above the water, a man in a boat is immediately below the woman on the bridge , at right angles to the bridge and at the rate of 4 ft /sec. how fast is the man and woman seprating at the end of 10 seconds
what i have figured out...
f(t) = 400t+70/t+1 represents the temp. in an oven and f(t) is in F degrees
first i used the quotient rule and got 330/(t+1)^2 = f'(t)
A) the rate of change in temp of the ove with respect to the time of 2 minutes after turnig the oven on and at 10 minutes
i pluged 2 and 10 in...
g(x) = (4+csc^2(3x))^2
this is what i got
1/2(4+csc^2(3x))^-1/2 * d/dx (4+csc^2(3x)
g'(x) = 1/2(4+csc(3x))^-1/2 (1+cot3)
did i go about this correct to get the answer or did i mess it up at the diretive part?
joe
y = x*square root of 3 + 2sinx find the x coordinate on (0,2pie) of the points where y has a horizonal tangent line
I am really lost and struggling on getting this started :cry: :confused:
thanks joe
Am I goong about these two problems correctly?
A) F(x) = (xsinx)(cosx) find F'(x)
f(x)*d/dx(g(x) + g(x) * d/dx F(x) product rule
F'(x) = xsinx d/dx (cosx) + cos x d/dx xsinx
= xsinx*(-sinx) + cos x *(xcosx)
= -xsin^2 x^2 + xcos^2 x^2 is that right
B) F(x) = xe^x/ x^2 +...
If F(x) -64/x^2 and it wants me to find an equation that decribes its position at (8,-1)
which way do you think is best to find this out using the division of deritives or get it by limts
The question is
fine a equation f(x) that has a vertical asymptotes of X=1and X=3 and a horizontal asymptotes of Y=1
A) (x-1)(x-3) / y-1 = x^2-4x+3 / x-1
OR
B) (x-1) /(x-1)(x-3) = just the oppsite of above
is any of these correct?
I think B is correct but right now I can't...
I don't know much about it , and reading the scetion is difficult to understand. I have been going to math lab and looking for a tutor to assist me with my struggles. but at least i am on the right track.
You said that this function passes through 0. Do I need to pick a point greater than...
Can anybody help me get started on this the radical in the Numerator gots me lost.
F(x) = 3-sq root x / 9-x has a removable discontinuity at x=9. define a new function g(x) such that g=f everywhere except at x = 9 , but is continuous everywhere.
:confused:
thanks joe
It has been at least 5 years since my last math class and I am kinda struggling.
The question is:
Use the intermediate value theorem to show that there is a root of ln x = e^-x on the interval (1,2). Find the correct root to 3 decimal values
What i have so far
f(1) = ln 1...
:confused: Suppose a firm in a perfectly competive industry is producing a output of 10 units. The firms total revenue at this output is $80 and its total cost is $30. The firms marginal cost associated with the 11 unit of a output is $12. What can i say about an increase in production should...
In this figure the path of the light passes from air to glass. Calculate the index of refraction
n1 = air = 1
n2 = glass = ?
Sin theta 1 = 30degrees
sin theat 2 is = 20 degrees
formula used n2 = n1*sin theta 1 / sin theta 2
sin of 30/ sin of 20 = n2 = 1.46 is this correct
hope the...
if a double concave mirror with a focal length f = -20 inches is used , where does the image seem to be located , if the image is 30 feet away from the lens
first i converted the 30ft to inches and got 360inches
used formula 1/p + 1/q = 1/f
.0028 + 1/q = -.05
1/q = -.053
q = -18.9...
The rear view on the passenger side of late model cars warn us theat objects may be closer than they appear. I think the mirror used is convex. But why is that type of mirror selected?
thanks joe
I know a prisim can be used to disperse white light into colors. This does not happen when a beam of light passes through a window pane.Why not?( the light may or may not be entering the glass window along the normal. The light does not disperse into colors).
thanks
A proton traveling at 3E6 m/s enters a region where the electric field has a magnitude of 3E5 N/C. The electric field is uniform and slows the proton's motions.
a)calculate the distamce the proton will travel before coming to a momentary halt?
B)Calculate the decel. of the proton and the...
The question is a charge object has a mass of 9.11E-31 kg and a charge of 1.602E-19 coul. Calculate the strength of the electric field that would provide a force equal to the weight of the charged object
E = Fe/m 1.602E-19 / 9.11E-31
E = 1.76E 11
joe
This is what i have so far the knowns
Vs= 50v
Vz = 10 v
Iz = 32mA
R1 = 1K ohm
Rl =? "potentmeter"
i just got the multisim program and could draw the cir if need be
R1 is in series with the source and the zener and rl are in parallel
it wants me to determine the range of Rl, Il...
The emitter current in a certian npn transitor is 8 mA. If .8% of the minority carrier injected into the base recombing with the holes, find the base current , collector current and the exact value of alpha
i am not sure how to get this started
thanks
joe
Determine the change in internal energy of 1 kg of water at 100 degrees C when it is fully boiled. Once boiled this volume of water changes to 1671 Liters of steam at 100 degrees C Assume the pressure remains constantat 1 atm
things i know
1 L =1E-3 m3
1atm = 1.013E5 N/m2
1 L = 1000 cm3 =...
Now if my Q is right and I use drags and Doc Als conversion then U is equal to 2.09E6 J
is that correct
these were some of the homework questions i didn't finish
Thanks alot
Joe :smile:
Seem to have ran into a brick wall with this problem
Determine the change in internal energy of 1 kg of water at 100 degrees C when it is fully boiled. Once boiled this volume of water changes to 1671 Liters of steam at 100 degrees C Assume the pressure remains constantat 1 atm
things i know...
A truck is pulling a car out of a ditchwith a steel cable that is 9.1 meters long and has a radius of .5cm. When the car just begins to move the tension of the cable is 890N. How much has the cable stretched?
converted .5cm to .005m
area of the wire A = pie*r^2
Y = 20E10 (steel)
used the...
The question is Air is primarly a mixture of N2 and O2. Assume that each gas behaves as an ideal gas. If the temperture is is 293K calculate the kinetic energy of the air and calculate the Vrms of N2and O2
what I know is Kb = 1.38E-23 J/K
mass of one molecule of N2 is 4.65E-26
mass of one...
2)450ml of helium gas has a temp of -14 degress celicus and a pressure of 820 mmHg. What volumne would the gas occupy if the temp. increases to 14 degrees celicus and the pressure increases to 960 mm Hg
my answer 426 ml
450(287K/259K)(820/960) is what i used
i think i got it right now Doc...
when i am calculating the eggiciency of a heat engine i have to convert the celicus to kelvis and used this formula
eff = 1-(T cold/T hot)*100
fro example 302C = 593K 610C = 883K
eff = 1-593/883 = about 32.8% efficient
right ?
thanks joe
I have 3 problems i would like to be reasured of the answer
1) 1200 liters of hydrogen gas has a temp of 50 degrees Celicus. To what temp would the gas have to be lowered so that the volumn would be 600 liters.
my answer is -111.65 degrees celicus
2)450ml of helium gas has a temp of -14...
thanks i did find something like that in one of my old circuit anay. books. It is always a good thing to keep them around when going back to school
thanks joe
Does an n-type semiconductor exhibit a negitive charge, or is it electrically neutral? Why?
I know that a n-type semiconductor is negitive charge
thanks joe
Truck weighs 6000 lbs The truck is going around a curve with a radius of 650 ft. The max friction force the road can exert is 1125 lbs.Its velocity needs to be calculated ft/sec.
Now I now F=ma and Ff = m*(v^2/r)
I also now that 1 pound = 4.448 N
problem is i have 3 different answers by...
A truck weighs 6000 lb. The truck is going around a curvewith a radius of 650 feet. The maximum friction force the road can exert on the tires is 1125 lb. it wants me to calculate the velocity in ft/sec
I am sort of lost on this an y help would be great
thanks
a waterfall is 30 m high and 10000 kg of water flow over it every second
A) calculate the potential energy
PE = mgh
got 2.94E6 joules
B) calculate the power delevered by the water of all the potential energy is converted to work
F = mA
F= 10000 * 9.80
f = 98000
w = Fm
w 98000 *...
The mass of the coaster is 800 kg
The lift hill is 18 m highabd it goes up the lift hill at 2.50 m/s
The second hill is 5.5m high.
Wants to know the speed at the top of the second hill.
do i really care about the weight of the car?
This is what i have so far
PEtop1 +KEtop1 = KE bott...
i think i got it right it wants to know the speed of the command module and the time it takes to do 1 revolution
mass moon = 7.35E22 kg
radius moon = 1.74E6 m
altitude 60 mi
fromula used was Vcm^2 = GMm/Ro
the speed of the module was 1634 m/s
The time formula thans to enigma was...
if the command module is 60 miles above the surface of the moon it wants me to calculate the speed of the module adn the time it takes to complete one revolutionaround the mooon?
givens
mass moon = 7.35 * 10 to the 22 power
radius moon = 1.74 * 10 to the 6 power
altitude above the surface...
sorry for the mass confusion but the prof like to us the north , south east and west for the directions and of course north and south and on the y-axis and E&W are on the X axis the reason i put the Y axis first is so when i am finding theata y/x seems simple in mind but i can see where i really...