Agymnast with mass m1 = 42 kg is on a balance beam that sits on (but is not attached to) two supports. the beam has a mass m2 = 112 kg and length l = 5 m. each support is 1/3 of the way from each end. initially the gymnast stands at the left end of the beam. be sure to use g=9.81 m/s^2 and keep at least 4 digits in this problem.

Why do atoms emit energy of only specific wavelengths

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?

How does the motion of an airplane compare to the motion of a rocket ?