page 4 or q 4. A 25.0kg child on a 2.00m long swing is released from rest when the swing supports make an angle of 30 with the vertical. a) Neglecting friction, find the child's speed at the lowest position. [3 points] b} If the speed of the child at the lowest position is 2.00m/s, what is the mechanical energy that is lost due to friction? [2 points] 5. Each of two small spheres is charged positively, the combined charge being 5.0 x 104C. If each Sphere is repelled from the other by a force of 1.0N when the spheres are 2.0m apart, calculate the charge on each sphere. [4 points] K1. An astronaut in a spaceship is listening to his music. Calculate the time it takes to play a 4.00 minute song at (a) 0.20 and at (b) 0.8 c? (c, the speed of light =3.0 x10"8 m/ S) Indicate the time measured by Mission Control on earth listening in on the astronaut. A1. When light of wavelength 440 nm strikes a metallic surface, electrons are released from the surface with a maximum kinetic energy of 1.1 eV. What is the metal's work function