When a wave crosses a boundary and changes speed and direction?

Explain how the technology of doing math and adding numbers has changed over time this is science

A circuit contains three resistors connected in parallel. the value of r1 is 100, the value of r2 is 400, and the value of r3 is 330. if this circuit is supplied with 40 vdc, what is the circuit current?

A toy consists of two identical spheres connected by a string with negligible mass. The toy is thrown at an angle above the horizontal such that the string remains taut and both sphere are revolving counterclockwise in a vertical plane around the

Two tug boats are towing a large boat, of mass M kg, back to shore. Tug boat 1 is pulling with a force of T1 N at an angle of 25 degrees north of the forward motion and tug boat 2 is pulling with a force of T2 N at an angle of 25 degrees south of

List three examples of word cookie sheets basic uses are

A 0.500-kilogram cart traveling to the right on a horizontal, frictionless surface at 2.20 meters per second collides head on with a 0.800-kilogram cart moving to the left at 1.10 meters per second.

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