3. A 64.3 kg skydiver jumps out of an airplane with a parachute. She decides not to pull the rip cord until she reaches terminal velocity. If the resistive force proportionality constant is 2.35 kg/s, what is the magnitude of the velocity when she decides to pull the cord? (Assume the drag force is proportional to the speed.) a. 16.4 m/s b. 268 m/s c. 151 m/s d. 9.80 m/s e. 27.4 m/s

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

1.A 150.0g hockey puck is placed on the floor of a bus. The coefficient of kinetic friction between the puck and the floor is 0.654. How far will the puck travel in 1.50 seconds if the bus slows down at a rate of 30.0 m/s 2? Include a free body diagram including any fictional forces. The puck starts from rest.

An airborne body of mass, m=64.3kg, is pushed straight upward by a vertical force, Fv=641N. a.What is the net force in the vertical irection? Let up be the positive direction, use Fv and let Fg be the wieght of the body.b. what is the magnitude of the net force exerted on the object in newtons?c. what is the acceleration of the body in m/s2?

A 200 kg object stay in rest on a 60 degree slope, the normal force on the object is: a. 200 kg b. 1960 N c. 1697 N d. 490 N e. 980 N

C. a. 1. Alan (m = 50 kg) and Diego (m = 40 kg) are standing on a frictionless ice rink, facing each other, when Alan pushes Diego. Diego moves with an acceleration of 1 m/s². What is the magnitude of Alan's acceleration? a. .8 m/s² b. 1.0 m/s² c. 1.25 m/s² d. Cannot be determined 2. How much horizontal force must a girl apply to a 50 kg cabinet to accelerate it at .4 m/s² along a horizontal surface if there is a friction force of 70 N? b. 50 N e. 90 N 3. Students design an experiment to determine the relationship between mass and acceleration where a cannon fires varying masses. Motion sensors are used to measure the velocity of the cannon ball while it is in the cannon. A graph of one of the trials is shown to the right. The mass is then increased for the next trial while keeping everything else the same. What should the velocity vs. time graph look like for this next trial? The second trial is the dashed line. 120 100 80 60 40 20 0 0 120 100 80 60 40 20 a. 20 N d. 80 N D Velocity…

5. A mass of 10kg sits on a level surface. One end of the surface is raised until the block begins to slide down the ramp at a constant velocity and angle of 20⁰. a. What is the coefficient of friction between the block and the incline plane? b. What is the weight of the Block,w?

The cables, knotted at B support the 60kg mass. Sketch a complete free body diagram knot at B. Determine the tension in Cable AB. a. 75.0N b. 981Nc. 736N d. 100N Determine the tension in Cable BC. a. 60.0N b. 589Nc. 45.0N d. 441N

3. A block slides down a frictionless plane having an inclination of = 20.0°. The block starts from rest at the top, and the length of the incline is 2.00 m. a. Draw a free-body diagram of the block. b. Find the acceleration of the block, and c. Its speed when it reaches the bottom of the incline.