Justify why does a bird flap its wing to fly higher?

Who was the first person to prove the curvature of the earth?

Boss tweed encourages his associates to work "like a well-oiled machine", thus providing his workers with A. an analogy B. a heuristic C. an algorithm D. functional fixedness (not correct)

Every year the Earth travels about 109km as it orbits the Sun. What is Earth's average speed in km/h?

The rubbing of one obejct or surface aganist another

If the net force on an object is in a negative direction what will the direction of the resulting acceleration be?

A 2kg marble is moving at 3 m/s when it strikes another 4kg marble moving in the opposite direction at - 3 m/s. What will be the velocity of the 4kg marble after the collision of the 2kg marble's new velocity is - 4 m/s.

How long did it take to reload a rifle during the 18th 19 century?

Hot spots in electronic and electric circuits can be detected visually with the use of A. dataloggers. B. thermocouples C. oscilloscopes D. infrared cameras.

A baseball with a mass of 0.8 kg is given an acceleration of 20m/s. how much force was applied to the ball

Stephen can push with 200N of force on a couch. If the couch has a mass of 20 kg, how much acceleration will the couch have?