If an object weighs 80 Newtons, what force must be applied to the rope to raise the object when the mechanical advantage is four?

Which formula would you use to solve this problem?

If an object has the the mass of 3kg, calculate the force acting on it.

The Big Bang is thought to have occurred __billon years ago

Technician A says twisted/shielded wire carries low current, and repairs to the wire must not increase the resistance of the circuit.

A man dressed in all black is walking down a country lane. Suddenly, a large black car without any lights on comes round the corner and screeches to a halt. How did the car know he was there?

If you die in a dream would you die in real life? Just a question i keep asking my self

Why is flammability a chemical property?

Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground. About how much work does Luke do on the sled? 250 J 690 J 1,500 J 1,600 J

Intramolecular and intermolecular forces hold together which of the following? A. atoms within a molecule B. molecules within an object C. charged particles within a salt crystal D. the atoms within compounds E. all of the above

Why is it that a football does not stay in motion at a constant speed when thrown, as the First Law of Motion suggests that it would? 1) Air resistance and acceleration 2) Gravity and mass 3) Distance, mass and gravity 4) Air resistance and gravity

A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. approximately how much work does the student do against friction in moving the box 5.