you need to push the couch 4 m to The other side of the room. after the initial push to get it going you push on the 90 Kg couch with a steady horizontal force of 600 N. The coefficient of kinetic friction between the couch on the floor is 0.6. 1. What is the magnitude and direction of the frictional force on the couch? 2. What is the magnitude and direction of the net force on the couch? 3. What is the magnitude and direction of the acceleration of the couch?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc