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  1. M

    Problem help!

    Problem: The distribution coefficient, k = (conc. in ligroin/ conc. in water), between ligroin and water for solute A is 7.5 . What weight of A would be removed from a solution of 10g of A in 100mL of water by a single extraction with 100 mL of ligroin? What weight of A would be removed by...
  2. M

    Vector addition

    I'm having trouble with this one problem: A plane flies from base camp to lake A, 280 km away, in a direction of 20.0 degrees north of east. After dropping off supplies it flies to lake B, which is 190 km at 30.0 degrees west of north from lake A. Graphically determine the distance and...
  3. M

    Simple calculation problems?

    Problem: The consumption of natural gas by a company satisfies the empirical equation V=1.50t + 0.800 00(t squared), where V is the volume in millions of cubic feet and t the time in months. Express this equation in units of cubic feet and seconds. Assign proper units to the coefficients...
  4. M

    Block on Spring without Friction

    I'm having a bit of trouble with the second part of this problem: A spring is stretched a distance of Dx = 40 cm beyond its relaxed length. Attached to the end of the spring is an block of mass m = 12 kg, which rests on a horizontal frictionless surface. A force of magnitude 35 N is required...
  5. M

    Velocity Addition

    I'm trying to figure this problem out, and think it's not that hard, but am having trouble acquiring the answer. Here is the problem: You and a friend decide to "hitch" a ride in the mailcar of a train heading to Green Bay (due north). Halfway there, your friend asks you for a sandwich out...
  6. M

    Friction Fraction

    Here is the problem: A student has two ramps both are at an angle of 30o. Ramp 1 is frictionless and ramp 2 has friction. The student also has two blocks, one for each ramp. She pushes the blocks up the ramps with the same initial velocity. The block on ramp 2 only travels a fraction f =...
  7. M

    Recoiling Canon

    Recoiling Cannon Problem: A circus cannon, which has a mass M = 4500 kg, is tilted at q = 50°. When it shoots a projectile at v0 = 40 m/s with respect to the cannon, the cannon recoils along a horizontal track at vcannon = 1.5 m/s with respect to the ground. A) At what angle to the...
  8. M

    Bullet Penetrates Can

    Problem: A bullet of mass 0.018 kg and initial speed 300 m/s penetrates an initially stationary pop can of mass 0.055 kg and emerges with a speed 200 m/s. A) What is the initial momentum of the bullet and pop can system? I found this answer by 0.018 * 300 = 5.6 B) What is the...
  9. M

    Collision with friction

    I'm having trouble solving for the correct answer for this problem: A block of mass M1 = 3.5 kg moves with velocity v1 = 6.3 m/s on a frictionless surface. It collides with block of mass M2 = 1.7 kg which is initially stationary. The blocks stick together and encounter a rough surface. The...
  10. M

    Decelerating Car

    I'm having trouble with the third part to this question: On a level road with its brakes on, the shortest distance in which a car traveling with 93 km/hr can stop is 91 m. This shortest distance occurs when the driver uses anti-lock brakes which means that that the car brakes without...
  11. M

    Two Blocks with friction

    Ok, I have this problem I've been working on forever, but can't figure out the last part of the question. A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of P = 30 N. The coefficient of friction of the blocks...
  12. M

    Three Pulling Strings

    Problem : Three strings, in the horizontal plane, meet in a knot and are pulled with three forces such that the knot is held stationary. The tension in string 1 is T1 = 2.5 N. The angle between strings 1 and 2 is q12 = 130° and the angle between strings 1 and 3 is q13 = 120° with string 3 below...
  13. M

    Three Blocks force on each other

    Ok, I don't know what I'm really doing in this problem. It does not seem as hard as I am making it seem, but I guess I need help to be guided through it. Here's the problem: Blocks of mass 4, 8, and 12 kg are lined up from left to right in that order on a frictionless surface so each block...
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