A boy pushes his sister on a circular swing. What is the speed of his sister on the swing if the boy counts 90 complete swings in 300 seconds and the radius is 1.2 meters?

If you were on a jury, do you think you would expect individual characteristics in the evidence? why or why not? what effects might it have if individuals expect to have individuals characteristics presented? this question is for forensic science

Abaseball picther can throw a ball at about 90 miles per hour, v = 40 m/s, on solid rock ground. we now put him into space. when he throws the ball, which weighs mb = 0.15 kg moves away from himat the same speed. how long does it take the ball thrown in space to travel the 30 meters to the batter? he weighs mp = 100kg

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b