A ball was thrown vertically upward on a planet with a velocity of 2.5 m/sec. If it can rise up to 4m, then calculate gravitational strength of the planet. pleas hel

What type of force holds atoms together in a crystal?

Which system of units is used by only a small number of countries in the world, including the u. s.

A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu