Light is shone on a diffraction grating with d=7.25x10^-6 m. The third order (m=3) maximum occurs at an angle of 12.2. What is the wavelength of the light in nanometers?
(Hint: The answer will be between 400 and 700.)

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?