Thursday
July 31, 2014

Posts by jawn


Total # Posts: 26

Biology
The genetic code for an oak tree is (A) More similar to an ash tree than to a squirrel (B) more similar to a chipmunk than to a maple tree (C) more similar to a mosquito than to an elm tree

physics
What is the volume occupied by 7.0 g of hydrogen under a pressure of 2.6 atm and a temperature of 300 K? answer is .0332 m^3. how? A steel cylinder of radius 7.0 cm and length 4.0 cm is placed in end-to-end thermal contact with a copper cylinder of the same dimensions. If the ...

PHYSICS
Two metal rods -- one copper the other aluminum -- are connected in series, as shown in the figure below. Note that each rod is 0.525 m in length, and has a square cross section 1.25 cm on a side. The temperature at the copper end of the rods is 2.00°C; the temperature at ...

physics
An aluminum saucepan with a diameter of 18 cm and a height of 6.0 cm is filled to the brim with water. The initial temperature of the pan and water is 19°C. The pan is now placed in a refrigerator and cooled to 9°C. Calculate the drop in water level in the pan.

physics
Starting at rest at the edge of a swimming pool, a 72.0 kg athlete swims along the surface of the water and reaches a speed of 1.10 m/s by doing the work Wnc1 = +165 J. Find the nonconservative work, Wnc2 done by the water on the athlete. Thanx in advance.

physics
At what altitude above the Earth's surface is the acceleration due to gravity equal to g/128? i did g/128=(G*Earth's mass)/r^2 then solved for r and got 72080960. its within 10% of the correct answer but not correct. what am i doing wrong? (ive already rounding differe...

Physics
A spaceship of mass m travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. (a) At what distance from the center of the Earth is the force due to the Earth five times the magnitude of the force due to the Moon? ...

physics
thanks much! ^^

physics
A train is traveling up a 5.2° incline at a speed of 3.09 m/s when the last car breaks free and begins to coast without friction. (a) How long does it take for the last car to come to rest momentarily? (b) How far did the last car travel before momentarily coming to rest?

physics
4*sin(25°) should be the distance north. 4*cos(25°) should be the distance east.

math
the answer is B. The parentheses represent that it is not inclusive. So since its -7<x<7 (not inclusive on both sides) then you use parentheses on both sides. If it were -7<=x<=7 then it would be D. hopefully that makes sense? :)

Physics
wow. that easy... haha thanx.

Physics
On vacation, your 1500 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 1.60 m/s2. (a) What is the net force exerted by the car on the trailer? please show work

physics
thanks a ton! =)

physics
there is no air resistance. using a cannonball launcher, how can i find how far the cannonball will go (horizontally) if launched at 30 degrees? heres what i know: -the vertical displacement is -.245m -the vertical acceleration is -9.81m/s^2 -at 0 degrees, the initial velocity...

Algebraic limits
how is it straightforward? they both go to indeterminates.

Algebraic limits
The limit as x approaches infinity. (1)/(5^x) The limit as x approaches 1. (1-x^3)/(2-sqrt(x^2-3)) Show your work thanks in advance!

physics
While sitting on a tree branch 10.0 m above the ground, you drop a chestnut. When the chestnut has fallen 2.0 m, you throw a second chestnut straight down. What initial speed must you give the second chestnut if they are both to reach the ground at the same time? Answer is 8.8...

Calculus
limit as x approaches infinity. (sin2x)/(x) answer is 0. show me how please. thanks in advance =)

algebra
50t + .1t^2 = 1100 Solve. show steps please

math
You jog at 6.6 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.4 mi/h? answer is 24.5 mi/h. WHY??

function or not?
sqrt(x+9)

algebra
one more. solve the inequality. (show steps please) (x+5)/(x-3) < 0

algebra
(sqare root of(x+1) +1) all divided by x. instructions are to rationalize the numerator.

basic algebra
1/x = 1/y + 1/z solve for Z

vectors
ok theres a graph. its like this. basically theres a ray coming from the origin going up and left diagonally at about a 30 degree angle. the question says "for the following vectors draw the component vectors along the x and y axis". what do i do?!

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