The boy of mass 40 kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r = 1.5 m, 0 = (0.7t) rad, and z = (-0.5t) m, where t is in seconds. Determine the components of force F,, F,, and F; which the slide exerts on him at the instant t = 2 s. Neglect the size of the boy. %3D Partial Ans. F, = 29.4 N r = 1.5 m

The boy of mass 40 kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r = 1.5 m, 0 = (0.7t) rad, and z = (-0.5t) m, where t is in seconds. Determine the components of force F,, F,, and F; which the slide exerts on him at the instant t = 2 s. Neglect the size of the boy. %3D Partial Ans. F, = 29.4 N r = 1.5 m

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)...

See similar textbooks

Similar questions

The 940-kg motorized unit A is designed to raise and lower the 445-kg bucket B of concrete. Determine the average force R which supports unit A during the 6.0 seconds required to slow the descent of the bucket from 3.1 m/s to 0.7 m/s. Analyze the entire system as a unit without finding the tension in the cable.
The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, θθ = 34°, θ˙θ˙ = 43 deg/s, and θ¨θ¨ = 10 deg/s2. Determine the magnited of the force F applied by arm OA and the magnitude of the force N applied by the sides of the slot to the 0.3-kg slider B. Neglect all friction, and let L = 0.88 m. The motion occurs in a vertical plane.
The 1.9-kg slider is released from rest in position A and slides without friction along the vertical-plane guide. Determine the normal force exerted by the guide on the slider (a) just before it passes point C, (b) just after it passes point C, and (c) just before it passes point E. The normal forces are positive if they point up and/or to the left, negative if they point down and/or to the right.
The boy of mass 42 kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r = 1.5 m, θ=(0.7t)rad, and z=(−0.5t)m, where t is in seconds. Neglect the size of the boy Determine the r, θ, z components of force F which the slide exerts on him at the instant t = 2 s using scalar notation
The 10-lb collar starts from rest at A and is lifted by applying a constant vertical force of F = 25 lb to the cord. Part A: If the rod is smooth, determine the power developed by the force at the instant θ = 60 degress
A man having the mass of 75 kg sits in the chair which is pin-connected to the frame BC. If the man isalways seated in an upright position, determine the horizontal and vertical reactions of the chair on theman at the instant Θ = 45 ̊. At this instant he has a speed of 6 m/s, which is increasing at 0.5 m/s2
The 600-kg bar B, originally at rest, is towed over a series of small rollers. The motor M is drawing in the cable at a rate of v = (0.3 t2) m/s, where t is in seconds. Determine the force in the cable when t = 2 s
When the 75 kg skier is at point A, she has a speed of 1.5m/s. Neglecting frictionand air resistance, and using a cosine curve for the slope (as shown in the figure):(a) Determine her speed when she reaches point B on the smooth slope.(b) What is the normal force on her skis at B, and her rate of increase in speed?
The roller coaster car has a mass of 700 kg, including its passenger. If it starts from the top of the hill A with a speed v A = 3 m/s, determine the minimum height h of the hill crest so that the car travels around the inside loops without leaving the track. Neglect friction, the mass of the wheels, and the size of the car. What is the normal reaction on the car when the car is at B1. find the Max g-force on passenger, bank angle2. the force required to slow down the motion and the time the force is applied must be determined to bring the coaster to rest.3. The maximum G-load experienced by a person should be no more than 5 g
The slider of mass m is released from rest in position A and slides without friction along the vertical‐plane guide shown. Determine the height h such that the normal force exerted by the guide on the slider is zero as the slider passes point C. For this value of h, determine the normal force as the slider passes point B.
Ball B is suspended from a cord of length l attached to acart A, which can roll freely on a frictionless, horizontal track.The ball and the cart have the same mass m . If the ballis given an initial horizontal velocity Vo while the cart is atrest, describe the subsequent motion of the system, specifying thevelocities of A and B for the following successive values of theangle θ (assume positive counterclockwise) that the cord willform with the vertical: (a) θ = θmax (b) θ = 0 (c) θ = θmin
. The 2.5-Mg four-wheel-drive SUV tows the 1.5-Mg trailer. The traction force developed at the wheels is FD = 9 kN. Determine the speed of the truck in 20 s, starting from rest. Also, determine the tension developed in the coupling, A, between the SUV and the trailer. Neglect the mass of the wheel