2. The speed of all electromagnetic waves in empty space is 3.00 x 108 m/s. Calculate
the wavelength of electromagnetic waves emitted at the following frequencies:
a. radio waves at 88.0 MHz
b. visible light at 6.0 x 108 MHz
C. X-rays at 3.0 1012 MHz

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.