Posts by jawn
Total # Posts: 26
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
May 18, 2010
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 ...
December 3, 2009
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 ...
November 23, 2009
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.
November 17, 2009
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.
October 21, 2009
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 ...
October 7, 2009
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? ...
October 6, 2009
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?
September 20, 2009
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? :)
September 20, 2009
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
September 15, 2009
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...
September 8, 2009
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...
August 27, 2009
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??
August 19, 2009
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?!
August 5, 2009