High-impact activities such as jogging can cause considerable damage to the cartilage at the knee joints. peak loads on each knee can be eight times body weight during jogging. the bones at the knee are separated by cartilage called the medial and lateral meniscus. although it varies considerably, the force at impact acts over approximately 11.0cm^2 of this cartilage. human cartilage has a young's modulus of about 24.0mpa (although that also varies).a) by what percent does the peak load impact of jogging compress the knee cartilage of a 76.0kg person? b)what would be the percentage for a lower-impact activity, such as power walking, for which the peak load is about four times body weight?

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.

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature