Practice problems
1. a concave mirror has a focal length of 6.0 cm. an object with
a height of 0.60 cm is placed 10.0 cm in front of the mirror.
a. calculate the image distance. 15 cm
b. calculate the image height. -0,9 cm
2. in the diagram below, the object is between the mirror and f.
use the data in the diagram to answer the questions below.
a. calculate the image distance.
b. calculate the image height.
ci
4 cm
2 cm

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.