A 80 kg person stands on a weight scale in a elevator. The elevator is moving up with a acceleration of 6 meter per second square. The normal force on the person is: a. 1264 N b. 784 N c. 1184 N d. 80 kg e. 480 N

A 2200 kg truck has put its front bumper against the rear bumper of a 2400 kg SUV to give it a push. With the engine at full power and good tires on good pavement, the maximum forward force on the truck is 18,000 N.a. What is the maximum possible acceleration the truck can give the SUV?b. At this acceleration, what is the force of the SUV’s bumper on the truck’s bumper?

2. You drop a single coffee filter of mass 1.7 g from a very tall building, and it takes 52 s to reach the ground. In a small fraction of that time, the coffee filter reached terminal speed. a. What was the upward force of the air resistance while the coffee filter was falling at terminal speed? b. Next, you drop a stack of five of these coffee filters. What was the upward force of the air resistance while this stack of coffee filters was falling at terminal speed? c. Again, assuming that the stack reaches terminal speed very quickly, about how long will the stack of coffee filters take to hit the ground? (Hint: Consider the relation between speed and the force of air resistance.)

Suppose a 4.25 slug gymnast is climbing a rope.  a. What is the tension, in the rope, in pounds if he climbs at a constant speed b. What is the tension, in the rope, in pounds, if he accelerates upwards at a rate of 5.9ft/s2

Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8-kg mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.5 m/s2, what is the tension in the second string attached to the 8-kg mass? a. 14 N b. 6.0 N c. 10 N d. 4.0 N

A 67 kg circus gymnast is suspended in the air by two ribbons which are tied to the ceiling above him. The two ribbons make an angle of 48 degrees withrespect to the ceiling. Assume gymnast is at rest. a. What is the magnitude of the tension force in each of the ropes?b. What is the reaction force associated with the gymnast’s weight?c. If the gymnast suddenly lets go of one of the ropes, what will be the horizontal component of his acceleration just after letting go?

W S Sand X 1. Two known forces F₁ = 3.85 N at 78.0° below the positive x-axis and F₂ = 3.25 N at 35.0° above the negative x-axis are acting on an object. What is the magnitude of the third force F3 so that the acceleration of the object is zero? N 3 2. A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly f the person's regular weight Calculate the magnitude of the acceleration of the elevator reads 1 38 E D C $ 4 SER R F 5 V B T MacBook Air Y B H 8 N J 9 DD M MOSISO command

A 45.0-kg person steps on a scale in an elevator. The scale reads 430 N. What is the acceleration of the elevator? We choose +y upward. 9.80 m/s 2 2 -0.244 m/s -0.422 m/s 2 0.422 m/s 0.244 m/s 2

A 4.10-kg block is at rest on a horizontal floor. If you push horizontally on the 4.10-kg block with a force of 12.0 N, it just starts to move. a. What is the coefficient of static friction? b. A 7.00-kg block is stacked on top of the 4.10-kg block. What is the magnitude F of the force, acting horizontally on the 4.10-kg block as before, that is required to make the two blocks start to move together? answer in N

24. A pickup truck with mass 980 kg is initially at rest. The truck accelerates to a speed of 95 km/hr within a distance of 60 meters. What the direction and size of the force that acts on the truck? a. b. If the truck were carrying a load of 200 kg, what new force would be required to achieve the same acceleration?