76. A rescue helicopter is lifting a man (weight = 822 N) from a cap- sized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acccleration of 1.10 m/s²? (b) What is the tension during the remainder of the rescue when he is pulled upward at a constant velocity?

An elevator is supported by a cable and moving downward through the elevator shaft at a constant speed. How does the upward tension force compare to the downward force of gravity? O The upward tension force is stronger than the downward force of gravity. The downward force of gravity is stronger than the upward tension force. The tension force and the force of gravity are of equal strength.

– 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

مجھے E 20 C 4. A 115 kg scaffold is 6.60 m long. It is hanging with two wires, one from each end. A 600 kg box sits 1.70 m from the left end. What is the tension in the right hand side wire? (g = 9.8 m/s²) Newtons $ R F 888 F4 V % 5 T G tv 6: B MacBook Air FG Y Q H & 7 F7 N 8 DII M ( 9 MOSISO FR O O P zoom mes or r ISUIT by mi 04 M nuffer

7. The effects of atmospheric drag cannot be deglected, in general, on the dynamics of objects moving through the air. The drag force is found to be FD where p is the density of air, A is the cross sectional area of the object, v is the object's velocity, and Cp is the so called drag coefficient. For a baseball Cp is measured to be - .5ρA Cp υ?, .3. (a) If the baseball is launched vertically with a speed of 90 miles per hour, how high will it travel? How would the answer change ignoring air resistance? (b) What is the speed of the baseball when it comes back down? How would the answer change if there was no air resistance? (c) How long does it take for the baseball to go up? Down? How would the anwers change in the absence of air resistance?

T2 T1 2 0, crate A supply crate is dropped from an airplane to the survivors of a devastating hurricane. For safety purposes, the crate has two parachutes which deploy from and keep the crate falling at a constant and vertical velocity. The parachutes make upward angles 61 = 35.0° and 62 = 48.0° with the horizontal. If the tension in the parachute making angle 61 is T1 = 142 N, what must the mass of %3D the crate be?

4. A 50.0-kg crate is being pulled along a horizontal smooth sSurface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the acceleration of the crate? A) 0.0684 m/s2 B) 0.188 m/s2 C) 0.200 m/s2 D) 0.376 m/s2 E) 0.0728 m/s2 Final formula: Required steps: 1) Draw free body diagram 2) Choose reference frame 3) Find vectors components 4) Apply Newton's 2nd law 5) Solve for a algebraically 6) Check units 7) Substitute numerical values