A sky diver of mass 61 kg can slow herself to a constant speed of 83 km/h by orienting her body horizontally, looking straight down with arms and legs extended. In this position, she presents the maximum cross-sectional area and thus maximizes the air-drag force on her. (a) What is the magnitude of the drag force on the sky diver? 598.41 (b) If the drag force is equal to bv2, what is the value of b? 95.75 X kg/m (c) At some instant she quickly flips into a "knife" position, orienting her body vertically with her arms straight down. Suppose this reduces the value of b to 58 percent of the value in Parts (a) and (b). What is her acceleration at the instant she achieves the "knife" position? -4.1 m/s2

A sky diver of mass 61 kg can slow herself to a constant speed of 83 km/h by orienting her body horizontally, looking straight down with arms and legs extended. In this position, she presents the maximum cross-sectional area and thus maximizes the air-drag force on her. (a) What is the magnitude of the drag force on the sky diver? 598.41 (b) If the drag force is equal to bv2, what is the value of b? 95.75 X kg/m (c) At some instant she quickly flips into a "knife" position, orienting her body vertically with her arms straight down. Suppose this reduces the value of b to 58 percent of the value in Parts (a) and (b). What is her acceleration at the instant she achieves the "knife" position? -4.1 m/s2

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

F5
A bulldozer drags a 252 kg long along the rough horizontal ground. The cable attached to the log applies a 525 N force at an angle of 30.0 degrees above the ground. The coefficient of kinetic friction between the log and the ground is 0.150. Assume the direction of motion is +x and upwards is +y. What is the normal force acting on the log? What kinetic friction force is acting on the log? (With proper sign) What is the acceleration of the log?
A stubborn dog is being walked on a leash by its owner. At one point, the dog encounters an interesting scent at some spot on the ground and wants to explore it in detail, but the owner gets impatient and pulls on the leash with force F ⃗ = (98.0i ^ + 132.0j ^ + 32.0k ^ )N along the leash. (a) What is the magnitude of the pulling force? (b) What angle does the leash make with the vertical?
t Three blocks are connected by massless ropes that move without slipping over frictionless pulleys; the mass of block A is 1.4 kg, the mass of block C is 2.1 kg, and the mass of block B is 6.0 kg. Each pulley can be modeled as a uniformly dense cylinder with a mass of 4.0 kg. What is the magnitude of the tension (in N) in the rope between block A and the pulley? rd A 1 B C Type your answer... Submit
pls helppp, I'll rate if you get the correct answer. NOTE: please put all the answers w/o rounding off, even if the answer is long. Ex. 1234.5678910 N
The accompanying figure shows a frictionless channel in the shape of a segment of a circle with center at "O". The channel has been anchored to a frictionless horizontal tabletop. You are looking down at the table. Forces exerted by the air are negligible. A ball is shot at high speed into the channel at "p" and exits at "r." Consider the following distinct forces: A downward force of gravity. A force exerted by the channel pointing from q to O. A force in the direction of motion. A force pointing from O to q. Which of the above forces is (are) acting on the ball when it is within the frictionless channel at position "q"?
An airplane is flying in a horizontal circle at a speed of 441 km/h. If its wings are tilted 40° to the horizontal, what is the radius of the circle in which the plane is flying? Assume that the required force is provided entirely by an "aerodynamic lift" that is perpendicular to the wing surface. m I 0
Apply the Gauss-Jordan to solve for acceleration a and the tensions T and R in the two ropes.
12:29 A docs.google.com Question The Screamin Demons (Dr. Weiss and Mr. Devinney) have entered a bobsled race. The sled run is at an angle of 29°. Dr. Weiss has come up with a super slick bobsled with a coefficient of friction of 0.0112. The combined mass of the two dare devils and their bobsled is 200 kg. What will be the Screamin Demons acceleration down the bobsled run? Make a free body diagram identifying all the forces acting on the Screamin Demon Bobsled. Upload a snap shot of your free body diagram here. * 1, Add file Question 1 * Calculate the weight F, of loaded bobsled. Your answer Question 2 *
Dandelion seeds have a plume made of thin filaments that create a very large drag coefficient due to subtle aerodynamics as the air moves through and past the plume. The slower terminal speed and longer time in the air provide greater dispersal than would be possible for simple spherical seeds. A 0.63 mg seed has a plume with a cross-section area of 13 mm, and it falls with a terminal speed of 40 cm/s.
A 0.50-mm-radius fishing line made of nylon is 100 m long when no forces are applied. A fish is hooked and pulls with a tension force Of 250 N. What is the elongation?
A 1.5-lb slider is propelled upward at A along the fixed curved bar which lies in a vertical plane. If the slider is observed to have a speed of 10.6 ft/sec as it passes position B, determine (a) the magnitude N of the force exerted by the fixed rod on the slider and (b) the rate v at which the speed of the slider is changing (positive if speeding up, negative if slowing down). Assume that friction is negligible. 29 2.8' Answers: N = Ib i ft/sec?