Which of these describes a physical change? Choose the correct answer. O Wood logs are burned in a fire. O Coconut oil begins to crystallize after being placed in a freezer. O Milk left out of the refrigerator for a week starts to smell different. O Sodium hydroxide and hydrochloric acid are mixed in water to form a salt​

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