Water is pumped through a hose pipe at a rate of 90kg per minute .watef emerges horizontally from yhe hose pipe with a speed of 20 ms .what is the minimum force required from a person holding the hosepipe to prevent it from moving backwards

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?