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  1. pmd28

    Quantum Chemistry: Theory based questions

    Hey all, I want to preface this with I wasn't sure if I should put this in the physics thread since it is quantum mechanics or in chemistry thread since this is for my Physical Chemistry course. I will gladly move the thread if the community feels it is more appropriate in the physics thread. I...
  2. pmd28

    Eletric Potential

    Homework Statement A positive charge +q1 is located to the left of a negative charge −q2. On a line passing through the two charges, there are two places where the total potential is zero. The first place is between the charges and is 3.35 cm to the left of the negative charge. The second...
  3. pmd28

    Equivalent Electri Force, Find the charge.

    Homework Statement Two objects are identical and small enough that their sizes can be ignored relative to the distance between them, which is 0.3 m. In a vacuum, each object carries a different charge, and they attract each other with a force of 2.3 N. The objects are brought into contact, so...
  4. pmd28

    Diffraction from a loud speaker

    Homework Statement Sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. Such a loudspeaker is mounted outside on a pole. In winter, when the temperature is 273 K, the diffraction angle θ has a value of 11°. What is the diffraction angle for the same...
  5. pmd28

    Speed of a Wave

    Homework Statement A person fishing from a pier observes that five wave crests pass by in 7.4 s and estimates the distance between two successive crests to be 4.6 m. The timing starts with the first crest and ends with the fifth. What is the speed of the wave? Homework Equations f=1/T...
  6. pmd28

    A person doing a pushup.

    Homework Statement a person (weight W = 590 N, L1 = 0.830 m, L2 = 0.409 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. Homework Equations Xcg= (W1X1 + W2X2)/(W1+W2) τ=Fl The Attempt at a...
  7. pmd28

    Mini-golf Windmill

    Homework Statement A golf ball passing through a windmill at a miniature golf course. The windmill has 6 blades and rotates at an angular speed of 1.65 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball (diameter 4.50x10-2 m) has just reached the edge...
  8. pmd28

    Mini-Golf Windmill

    Homework Statement A golf ball passing through a windmill at a miniature golf course. The windmill has 6 blades and rotates at an angular speed of 1.65 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball (diameter 4.50x10-2 m) has just reached the edge of...
  9. pmd28

    Car going up a hill. Find the Angle of the hill.

    Homework Statement A 1550-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 21 m/s. Going up a hill, the car's engine produces 44 hp more power to sustain the constant velocity than it does going down the...
  10. pmd28

    A person slides downa spherical, frictionless surface.

    Homework Statement A person starts from rest at the top of a large, frictionless, spherical surface, and slides into the water below. At what angle θ does the person leave the surface? (Hint: When the person leaves the surface, the normal force is zero.) Homework Equations Don't Know...
  11. pmd28

    Bob drops some balls.

    Bob has two balls. He releases one ball from a platform of height H. Just as that ball strikes the ground he releases the next ball from the same height H. Assuming that the first ball bounces perfectly, (i.e. reversing only the direction of its velocity when it strikes the ground), at what...
  12. pmd28

    Three children slide down a hill.

    Three children, Aaron (20kg), Beth (25kg) and Charlie (30kg) take off on sleds at the top of a hill. Who will reach the bottom first? (μ=.15) a)Aaron b)Beth c)Charlie d)All of them reach at the same time f=μN The answer is d. my first guess was A because i thought that since Aaron...
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