Asmall mirror is attached to a vertical wall, and it hangs a distance of 1.70 m above the floor. the mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. the incident and reflected rays both lie in a plane that is perpendicular to both the wall and the floor. early in the morning, the ray is observed to strike the floor at a distance of 3.75 m from the base of the wall. later on in the morning, the ray strikes the floor at a distance of 1.18 m from the wall. the earth rotates at 15.0 degrees per hour. how much time (in hours) has elapsed between the two observations

The ballistic pendulum was invented in 1742 by english mathematician benjamin robins. it consists of an initially stationary pendulum that moves after being struck by a bullet, and it is used to measure the original velocity of the bullet. the known variables are the bullet's mass m, the pendulum's mass m, and the height to which the block and bullet swing, determined by the length of the pendulum l and final angle θ. two principles of physics are necessary to solve for the bullet's original velocity. what are these principles? conservation of momentum and newton's third law conservation of energy and conservation of angular momentum grade summary deductions 0% potential 100% conservation of momentum and newton's second law. newton's second law and conservation of angular momentum. conservation of energy and newton's third law conservation of momentum and conservation of angular momentum. conservation of momentum and conservation of energy conservation of energy and newton's second law.

What is the rate of change in a objects position?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?