The force (f) needed to stretch a spring by a distance x is
given by the equation f = k·x, where k is the spring
constant (measured in newtons per centimeter, or n/cm).
if a 12 newton force stretches a certain spring by 10 cm,
calculate each of the following. round your answers to the
nearest tenth.
a. the spring constant. k =
n/cm
b. the force needed to stretch the spring by 7 cm. f =
n
c. the distance the spring would stretch with a 23 n force. x =
cm

Aball is thrown upward in the air, and its height above the ground after t seconds is h ( t ) = 57 t − 16 t 2 feet. find the time t when the ball will be traveling upward at 14.25 feet per second.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.