An airplane and a freight train have the same momentum. The airplane has a mass of 21,700 kg and is traveling at
1,200 km/h. The train has a mass of 9,600,000 kg.
What is the speed of the train?

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600