Asemi-circle of radius 8 cm, rocks back and forth along a line. the distance between the line on which the semi-circle sits and the line above is 12 cm. as it rocks without slipping, the semi-circle touches the line above at two points. (when the semi-circle hits the line above, it immediately rocks back in the other direction.) what is the distance between these two points, in millimetres, rounded off to the nearest whole number

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

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?