![]() What is its acceleration? What can you say about the external force acting on the system? Acceleration is 0.21 m/s2. 2.59× 104 N Suppose that the net external force (push minus friction) exerted on a lawn mower is 51 N parallel to the ground. The sled's initial acceleration is 49 m/s2, the mass of the system is 2100 kg, and the force of friction opposing the motion is 650 N.650N650N. Assuming both people apply the same magnitude force, approximately how much force will each need to apply if friction that opposes the motion of the car is 300 N? 1650 N Calculate the magnitude of force exerted by each rocket called its thrust T, for the four-rocket propulsion system shown. An acceleration of at least 1.5 m/s2 is required to get the car to a speed that will start it. What is the net external force on him? 265 N Two people push a 2000 kg car to get it started. 13.3 m/s2 A 63.0-kg sprinter starts a race with an acceleration of 4.20 m/s2. If you apply twice the force (2□ ), what distance does it travel in the same time? 2x A cleaner pushes a 4.50-kg laundry cart in such a way that the net external force on it is 60.0 N. A 500.0 kg block is suspended by a rope in an elevator that is descending at 2.0 m/s/s What is the tension in the rope? 4000 N You push an object of mass □ with a force □ and cause the object to travel a distance □ in a certain time. ![]() When the box is sliding freely, what is the direction of the net external force? The net external force acts to left. The box slows down as it slides across the floor. In what direction must you apply force to prevent the box from moving? Southeast A person pushes a box from left to right and then lets the box slide freely across the floor. What net force is required to keep this object moving in a straight line at constant speed? 0N Two people are pushing a box with forces of equal strength: one to the west and one to the north. A 25 kg object moves from left to right at a speed of 30 km/h. Newton's Second Law describes the relationship between which quantities? Force, mass, and acceleration.
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