In what medium does sound travel fastest

Which statement correctly describes the motion on which an Earth time interval is based? A. Earth's year is based on the sun's revolution. B. Earth's day is based on the Earth's rotation. C. Earth's day is based on the sun's revolution. D.

A mechanical wave moves through a medium, which can be what?

Which of the following is an advantage of using solar energy? A) it is expensive to maintain. B) it requires a high initial investment. C) it is a form of free and abundant energy. D) it requires good sun exposure.

Which force is the more dominant one in the hydrogen atom, the gravitational or the electrical? by what factor?

123456789101112 A ride at an amusement park moves the riders in a circle at a rate of 6.0 m/s. If the radius of the ride is 9.0 meters, what is the acceleration of the ride? 4.0 m/s2 0.67 m/s2 0.075 m/s2 54 m/s2

Which of the following objects is in dynamic equilibrium? A - a man standing in one place without moving B - a bicycle accelerating forward at 1.

A boat is traveling upstream in the positive direction of the x axis at 10 km/h with respect to the water of a river. The water is flowing at 7 km/h with respect to the ground. (a) What is the velocity of the boat with respect to the ground?

What are the standard units of length mass volume and temperature?

Approximately how long is a light-year? A. 9.5 billion km B. 95 billion km C. 9.5 trillion km D. 95 trillion km

A car that increases its speed from 20km/h to 100km/h undergoes what acceleration