A 90-kg skydiver jumps out of a plane above the earth. ⦁ As soon as he exits the plane, when there is no air resistance, what is the skydiver’s acceleration? ⦁ After one second, he is now accelerating at a rate of 6.7 m/s/s downward. What force is the air exerting on him? (Draw a free-body diagram!)

A 90-kg skydiver jumps out of a plane above the earth. ⦁ As soon as he exits the plane, when there is no air resistance, what is the skydiver’s acceleration? ⦁ After one second, he is now accelerating at a rate of 6.7 m/s/s downward. What force is the air exerting on him? (Draw a free-body diagram!)

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 22PQ: A particle with mass m = 4.00 kg accelerates according to a=(300i+200j) m/s2. a. What is the net...

See similar textbooks

Similar questions

A particle with mass m = 4.00 kg accelerates according to a=(300i+200j) m/s2. a. What is the net force acting on the particle? b. What is the magnitude of this force?
An elevator filled with passengers has a mass of 1.70103kg . (a) The elevator accelerates upward from rest at a rate of 1.20m/s2for 1.50 s. Calculate the tension in the cable supporting the elevator. (b) The elevator continues upward at constant velocity for 8.50 s. What is the tension in the cable during this time? (c) The elevator decelerates at a rate of 0.600 in/s2 for 0.600m/s2 3.00 s. What is the tension in the cable during deceleration? (d) How high has the elevator moved above its original starting point, and what is its final velocity?
A force of 30.0 N is applied in the positive x-direction to a block of mass 8.00 kg, at rest on a frictionless surface. (a) What is the blocks acceleration? (b) How fast is it going after 6.00 s? (Sec Sections 2.5 and 4.3.)
A loaded elevator of mass 2200 Kg is supported by cables that can withstand a maximum tension of only 28,000 N. A.) What is the maximum safe upward acceleration for the elevator? B.) What would be the maximum safe upward acceleration for the elevator if it was on the moon. Where g = 1.62 m/ s2
A man is trying to push a 75.0 kg rock across the ground by applying a constant force P at an angle θ = 27.5 ̊ below the horizontal. The coefficients of friction between the rock and the ground are μk = 0.430 and μs = 0.570. (a) If the rock is initially at rest, what force does the man need to apply to get it to start moving? (b) If the rock is already in motion, what force does he need to apply to get it accelerate at 2.75 m/s2?
Three blocks, with mass m1 = m2 = m3 = 2 kg, are suspended from the ceiling of an elevator as shown in the figure. If the elevator moves with an upward acceleration of magnitude 3 m/s2 (a) What is the tension in the string T3? (b) What is the tension in the string T2? (c) If all strings can withstand the maximum tension of 90 N, whatmaximum acceleration can the elevator have before a stringbreaks? (Hint: think about which string will break first).
While an elevator of mass 2530kg moves upward, the force exerted by the cable is 27.6 kN. (a) What is the acceleration of the elevator? (b) If at some point in the motion the velocity of the elevator is 1.20m//s upward, what is the elevator's velocity 4.00s later?
A block moving on a horizontal surface is at xx = 0 when tt = 0 and is sliding east with a speed of 12.0 m/sm/s. Because of a net force acting on the block, it has a constant acceleration with direction west and magnitude 2.00 m/s2m/s2. The block travels east, slows down, reverses direction, and then travels west with increasing speed. a) At what value of tt is the block again at xx = 0? I got this one & the answser is 12s. I need help w b and c. b)What is the maximum distance east of xx = 0 that the block reaches? c)How long does it take the block to reach this point? TIA
You walk into an elevator, step onto a scale, and push the "down" button to go directly from the tenth floor to the first floor. You also recall that your normal weight is w = 615 N. If the elevator has an initial acceleration of magnitude 2.45 m/s2, what does the scale read?
An object with a mass of 15 kg rests on a frictionless horizontal plane and is acted upon by ahorizontal force of 30 N.(a) What is its acceleration?(b) How far will it move in 10 s?(c) What will be its velocity after 10 s?
30. In the bed of the truck is a 15 kg crate for which μs = 0.20 and μk = 0.15. (a) What is the maximum acceleration rate of the truck at which the crate will not slide across the bed? (b) If the truck exceeds this by accelerating at 4.0 m/s2 0.0, what will be the crate’s acceleration – both relative to earth and relative to the truck?
A 450 lb motorcycle accelerates from 0 to 55 mi/h in 6.0 s. (a) What is the magnitude of the motorcycle’s constant acceleration? (b) What is the magnitude of the net force causing the acceleration?