10/28/15

Physics Help?
An artillery shell is fired with an initial velocity of 300 m/s at 55° above the horizontal. To clear an avalanche, it explodes on a mountainside 42.0s after firing. Whar are the x- and... more
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10/28/15

Physics Help?
A bullet going 153 m/s crashes through a wood plank. After passing through the plank, its speed is 130 m/s. Another bullet, of same mass and size traveling at 92 m/s is also fired at the plank.What... more
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10/27/15

Find the derivative of y = coth^-1(sec(x)). SImplify if possible.
Find the derivative of y = coth-1 (sec(x)). Simplify if possible.   I applied the Chain Rule.   -sech(x)tanh(x) _____________ (1 - sec(x)2)1/2   I don't know where to go from... more
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10/27/15

Physics Help Please?
(1) A 3.00 kg ball is dropped from rest from the roof of a building 176.4 m high. While the ball is falling, a horizontal wind exerts a constant force of 12.0 N on the ball. How long until the ball... more
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10/26/15

application problem
You have taken 2 test each was worth 20% of your grade. Right now your average is 93.7. You need to have a 91.5% to get an A. what precent do you need to average from this point on to keep your A?
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10/26/15

Baryon to photon ratio urgent help
I am having trouble showing that the baryon to photon ratio isη= nb/nγ ~ 2.7x10-8Ωbh2where nb and nγ are the number density of baryons and photons respectively, Ωb is the baryon density parameter... more
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10/26/15

I need help on matrices I don't understand
A small business takes out loans from three banks to buy some new equipment. The total amount of the three loans is $34000. The first bank offered an interest rate of 16%. The second bank offered a... more
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10/25/15

whats the chemical equation of the fusion of oxygen and silicon?
This is a science question. Please help.
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10/25/15

This is an open question so there are no answers in the textbook, is there any methodical solution that is not trial and error? Please keep it simple!
An engineer designs a slide for a playground. As shown in the diagram, the slide AB is 20 cm long. Angle ACB is 90°. The gradient of the slide is required to be greater than 1/2 but less than 1.... more
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10/24/15

The supplement of an angle is three times the complement of the angle. Find the measure of 1/2 supplement of the complement
my teacher worded this problem really weird and left a  of typos and I can't figure out how to do this help please
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10/24/15

What is the speed of a sound wave from a 440 Hz tuning fork at temperature 23 degrees C?
What is the speed of a sound wave from a 440 Hz tuning fork at temperature 23 degrees C?
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10/24/15

Physics question
A 126 kg railroad car carrying a 53.5 kg passenger travels alone on a level frictionless track with a constant horizontal speed of Vx = 12.6 m/s. At some later time the person riding on the car... more
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10/24/15

Linear Systems Theory HW
I have this as homework in an integrated three math class. We are working on linear systems (thanks for the help in advance!!!): Bob purchases the same four items every week (apples, ice cream,... more
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10/23/15

What is the current when time = 2 seconds?
The charge q on a certain capacitor in an amplifier circuit as a function of time t is given by:   just to be clear π= pie   q = e-0.1t (0.2 sin 120πt + 0.8 cos 120πt)   the current i in the... more
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10/23/15

How to simplify log base 3 (4^3)?
I just need to know how to simplify it.
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10/23/15

Mrs. Lamar has a class of 16 students
Mrs. Lamar has a class of 16 students. She can spend $24 on each student to buy math supplies. She first buys her students calculators which cost a total of $99.20. After buying the calculators,... more
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10/23/15

Calculate the value of the equilibrium constant k for the reaction A+B=C
Calculate the value of the equilibrium constant K for the reaction A+B=C from the following information: 3C=D (Kc=7.9*10^-4) D=3A+3B (Kc= 6.7*10^-2) note the equal sign is the forward/reverse... more
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10/23/15

Selecting a committee
A city council consist of 8 Democrats and 5 Republicans. If a committee of 6 people is selected, find the probability of selecting 4 Democrats and 2 Republicans.
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10/22/15

Deuterium synthesis baryon to photon ratio
The synthesis of heavier elements started with the formation of deuterium (n+p -> D+γ). Deuterium has a binding energy BD = 2.22MeV, so we might expect that deuterium forms when kT ~ BD, since a... more
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10/22/15

PROBABILITY
A bag contains 6 red balls and 6 blue balls. 5 balls are selected at random. Find the probability of selecting 5 red balls.
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10/22/15

If g(x) = x*f(x) where f(3) = 4 and f'(3) = -2...
If g(x) = x*f(x) where f(3) = 4 and f'(3) = -2, find an equation of the tangent line to the graph of g at the point where x = 3 I get that I need to apply the product rule. I believe the... more
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10/22/15

Evaluate lim (x --> 1) (x^1000 - 1) / (x - 1)
Evaluate lim (x --> 1) (x1000 - 1) / (x - 1)   I tried using the conjugate but that didn't do anything for me     #77 on p183 ANSWER:   1,000
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10/22/15

4th grade math
This is my daughters 4th grade math home work. My brain is long past this can you help? Mrs. Garcia watches 16 students cycle home after school. She counts 38 wheels. Some of the students are on... more
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10/22/15

What is the constant, linear and quadratic terms of f(x)=x(squared)-7
is it linear or quadratic?
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10/22/15

A student is running a 10-kilometer race. He runs 1 kilometer every 4 minutes. Select the function that describes his distance.
I need help this is functions in algebra 
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