skhan

Popular questions and responses by skhan
  1. physics

    a compact car has mass 725 kg and is moving at 100 km/h. a) find its momentum b) at what velocity is the momentum of a larger car, mass 2175 kg., equal to that of the smaller car?

    asked on January 31, 2011
  2. physics

    a .415 kg baseball is pitched at 42 m/s. the batter hits it horizontally to the pitcher at 58 m/s. a) find the change in momentum of the ball. b) if the ball and bat were in contact for 4.6*10^-4 s what would be the average force while they touched?

    asked on January 31, 2011
  3. physics

    There are two forces acting on a box of golf balls, F1 and F2. The mass of the box is 0.750 kg. When the forces act in the same direction, they cause an acceleration of 0.450 m/s2. When they oppose one another, the box accelerates at 0.240 m/s2 in the

    asked on December 2, 2010
  4. physics

    When empty, a particular helicopter of mass 3770 kg can accelerate straight upward at a maximum acceleration of 1.36 m/s2. A careless crewman overloads the helicopter so that it is just unable to lift off. What is the mass of the cargo?

    asked on December 2, 2010
  5. Completely Randomized ANOVA

    Forty eight subjects were randomly assigned to one of 4 treatment conditions in a study of different methods of coping with statistics exam anxiety. After the experiment, 12 subjects remained in group 1, 8 in group 2, 10 in group 3, and 10 in group 4. The

    asked on June 11, 2006
  6. Post hoc & a priori tests

    A researcher begins with a sample of 60 subjects and randomly assigns 12 to each of 5 treatment conditions. Based on his reading of other studies in the area, the researcher predicts that group 3 will obtain a significantly different mean from group 1, and

    asked on June 11, 2006