Tuesday
May 21, 2013

# Posts by Jesse

Total # Posts: 269

Chemistry 2
An aqueous solution has a vapor pressure of 81.1 at 50 . The vapor pressure of pure water at this temperature is 92.6. What is the concentration of in mass percent?

physics
Two carts with masses of 15.5 kg and 1.0 kg, respectively, move in opposite directions on a frictionless horizontal track with speeds of 6.0 m/s and 2.0 m/s, respectively. The carts stick together after colliding head-on. Find the final speed of the two carts. m/s

Algebra 1
(11 - 7) 5

physics
A 0.025 kg golf ball moving at 27 m/s crashes through the window of a house in 5.0 10-4 s. After the crash, the ball continues in the same direction with a speed of 10 m/s. Assuming the force exerted on the ball by the window was constant, what was the magnitude of this force?

physics
A 2.50 kg ball strikes a wall with a velocity of 10.0 m/s to the left. The ball bounces off with a velocity of 4.5 m/s to the right. If the ball is in contact with the wall for 0.10 s, what is the constant force exerted on the ball by the wall? N to the right

math
If a person is ordering fencing for a yard which is more important the area or the perimeter.

math
Find the derivative of f(x)= (2x+3)/(3x+5)

Physics
A windowpane is half a centimeter thick and has an area of 1.0 m2. The temperature difference between the inside and outside surfaces of the pane is 15° C. What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s×m×°C.)

Physics
A 0.003 0-kg lead bullet is traveling at a speed of 240 m/s when it embeds in a block of ice at 0°C. If all the heat generated goes into melting ice, what quantity of ice is melted? (Lf = 80 kcal/kg, the specific heat of lead = 0.03 kcal/kg×°C, and 1 kcal = 4 186 J)

Physics
A steel wire, 150 m long at 10°C, has a coefficient of linear expansion of 11 ´ 10-6/C°. Give its change in length as the temperature changes from 10°C to 45°C.

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