By 1949 americans who lived within the range of a television stations in the country could watch tv, vastly changing the way that humans communicated with each other. what type of electromagnetic wave made tv technology possible? a) microwaves b) radio waves c) seismic waves d) infrared waves

Newtons view of arrangement of the universe

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.

The energy of a photon is equal to (what) times (what) of the photon.