Three pulleys are to be used to lift a 1000N load from the ground to the top floor of a building 40.0m high. Draw an arrangement of the pulleys showing the windings . Given that the efficiency of the machine is 72.0% , calculate the : 1. Velocity ratio
2. Effort required
3. The total energy not used for any useful work. Suggest reasons why there must be loses in energy for this kind of machine.

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.

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig