A box with a mass 13.0 kg moves on a ramp that is inclined at an angle of 55.0° above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is μk = 0.300.(a) Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 150.0 N that is parallel to the ramp surface and directed down the ramp, moving the box down the ramp.(b) Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 150.0 N that is parallel to the ramp surface and directed up the ramp, moving the box up the ramp.

The space within which a test north pole experiences a force magnetic poles 2. a powerful stream of electrons flowing high above the earth in the ionosphere electrojet 3. a concept to explain the directional nature of a magnetic field field lines 4. coil of wire designed to produce a magnetic field by a current passing through its windings ionosphere 5. that region above the earth's atmosphere where particles exist in an ionized state magnetic field 6. the extremities of a magnet where the field lines tend to converge or concentrate aurora borealis 7. a phenomenon that occurs in the northern latitudes; the northern lights solenoid

Moria is drawing the electric field lines around a pair of charges. one charge is positive, and the other charge is negative.

Which statements describe how a machine can make work easier? check all that apply. it can put out more force than the input force by decreasing the distance through which force is applied. it can increase the amount of work performed if the output force is in the same direction as the input force. it can apply a force to an object in a different direction than the force applied to the machine. it can increase the distance through which a force acts by exerting less force than was used on it. it can exert a greater force through a greater distance than the force used on the machine.