A positively charged ebonite rod is brought close to a small ball. The rod does not touch the ball, which is made from a conducting material. The ball is electrically neutral. Which one of the following statements is true?
a. The rod neither attracts nor repels the ball.
b. The rod repels the ball.
c. As the rod is brought closer to the ball, the force changes from an attractive force to a repulsive force.
d. The rod attracts the ball

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?