An object is placed in front of a lens of focal length 20.0 cm. What is the object
distance so that the magnification of the
image is -10.0?
[?] cm

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

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?

Observations show that interstellar clouds can have almost any shape and