1. Assume that the dunes in a field of barchans sand dunes are moving at an average long-term rate of 30 meters (about 100 feet) a year. How many years does it take a dune to move a distance of 500 meters?

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

Which best describes the relationship between internal energy and thermal energy? Thermal energy is a measure of the internal energy of a substance. Internal energy is a measure of the thermal energy of a substance.

in a certain right triangle, the two sides that are perpendicular to each other are 5.9 and 5.1 m long. what is the tangent of the angle for which 5.9 m is the opposite side?

The velocity a rocket must reach to establish an orbit around Earth is called a. thrust velocity. c. artificial velocity. b. orbital velocity. d. escape velocity.

What species has the electron configuration [ar]3d2?

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False