Recent content by Lilly

hi, i know this problem has to do with derivatives and I'm sure its easy, but for some reason i just can't figure it out... Find equations of both lines through the point (2,-3) that are tangent to the parabola y= x^2 + x help please...i know the derivative is 2x + 1 ...and that the 2...

it's wrong because there is this website for my physics class where we have to post our answers to the questions and it won't accept an answer unless its right. and my answer is not being accepted, so it must be wrong...

hi, i need some help w/ this problem: a) A block of mass 2.00 kg is pushed 2.32 m along a frictionless horizontal table by a constant 17.7 N force directed 25.5 degbelow the horizontal. Determine the work done by the applied force. b) Determine the magnitude of the normal force exerted...

Force and Motion... hi could someone please tell me where i am going wrong with this question: A freight train has a mass of 1.20E+7 kg. If the locomotive can exert a constant pull of 6.10E+5 N, how long does it take to increase the speed of the train from rest to 83.4 km/hr? i tried to...

thanks, i figured it out! :)

hi, if anyone knows how to do this question, could you please get me started? A ball is thrown upward from the ground with an initial speed of 23.2 m/s; at the same instant, a ball is dropped from a building 16.1 m high. After how long will the balls be at the same height? thanks...

thank you! thanks so much :)

Could someone please help me do this question, at least parts B and C?? I already know that the max height is 281.66 m. Thank you! A model rocket is launched straight upward with an initial speed of 49.5 m/s. It accelerates with a constantupward acceleration of 1.83 m/s^2 until its engines...

Thank you for your help chem_tr, for this problem as well as the one on effusion rates! Helped a lot. :)

help...with these problems please! hi, could someone please help me with these? i would really appreciate it! 1) We state that the ideal gas law tends to hold best at low pressures and high tempuratures.Show how the Van der Waal's equation simplifies to the ideal gas law under these...

If anyone knows how to do this problem, could you please give me some hints?? I don’t need the answer just some help as to where to start... Metallic molybdenum can be produced from the mineral molybdenite, MoS2. The mineral is first oxidized in air to molybdenum trioxide and sulfur...

effusion rates...please help! Could someone please explain to me how to do this question... The rate of effusion of a particular gas was measured to be 24.0 mL/min. Under the same conditions the rate of effusion of pure methane gas, (CH4) is 47.8 mL/min. What is the molar mass of the unknown gas?