Boxing gloves are padded to lessen the force of a blow. (a) calculate the force (in n) exerted by a boxing glove on an opponent's face, if the glove and face compress 8.00 cm during a blow in which the 6.50 kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force (in n) 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. (assume the total mass of the arm remains 6.50 kg.) (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?

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles