ASclence Final 2021 14of 25 A train blows its whistle as it moves rapidly towards a stationary observer. Which of the following best describes the sound of the whistle
as heard by the observer in comparison to the sound as heard bya passenger on the train?
OAThe sound heard by the observer will be the same as the sound heard by the passenger.
OBThe sound heard by the observer will of a higher volume than the sound heard by the passenger
OCThe sound heard by the observer will be higher in pitch than the sound heard by the passenger.
ODThe sound heard by the observer will be lower in pitch than the sound heard by the passenger.
W

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.

The softest and hardest minerals are: softest hardest

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9