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Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

Which pulls on the oceans of Earth with a greater force?

While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up

A boy plays solitary seesaw by placing the seesaw’s fulcrum one-eighth the distance from where he sits at one end. Which weighs more?

A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is

Which of these vary for satellites in elliptical orbits?

If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will

It is important to keep regular written records on children with special needs, including gifted children, for all of the reasons liste below, except:

When a teacher writes down a child’s words or story, it is important to: