Apoint charge q2 = -3.8 μc is fixed at the origin of a co-ordinate system as shown. another point charge q1 = 1.7 μc is is initially located at point p, a distance d1 = 8.5 cm from the origin along the x-axis

the charge q2 is now replaced by two charges q3 and q4 which each have a magnitude of -1.9 μc, half of that of q2. the charges are located a distance a = 2 cm from the oringin along the y-axis as shown. what is δpe, the change in potential energy now if charge q1 is moved from point p to point r?

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

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?