The 1400 kg car is starting from rest with a constant acceleration, and after 20 s reaches a speed of 40 km/h. The front wheels are free to roll. Neglect the mass of the wheels and calculate: 1. The normal reactions at each of the four wheels on the road 2. The friction force under the rear driving wheels B.

The 1400 kg car is starting from rest with a constant acceleration, and after 20 s reaches a speed of 40 km/h. The front wheels are free to roll. Neglect the mass of the wheels and calculate: 1. The normal reactions at each of the four wheels on the road 2. The friction force under the rear driving wheels B.

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 7.48P: Find the smallest distance d for which the hook will remain at rest when acted on by the force P....

See similar textbooks

Similar questions

In a porter governor the mass of the central load is 18 kgand the mass of each ball is 2kg. the top arms (250+X) mm while the bottom arms are (300+X) mm long. The friction of the sleeve is 20 N. If the top arms make 45 deg with the axis of rotation in the equilibrium position, find the range of the speed of the governor in that position Note X is the student roll no. for example if the student roll no is A20 then X=20
1. A cart is being pulled by a motor. The cart has a mass of m = 200 kg. The motor applies a horizontal force of F = 800 N to the center of the right side of the cart. The cart is 1m tall, the total length is 1.5m, the wheels are 1m apart from each other, and the center of mass G is 0.4 m above the floor and on the horizontal center. Ignore friction. If there is no rotational movement of the cart, determine the following: 1. The cart's acceleration 2. The reaction (normal) force at the front pair of wheels. 3. The reaction (normal) force at the rear pair of wheels. F 77 TI T
The torsional spring has a stiffness of 20 N-m/rad and is undeflected when the 3-kg uniform slender bar is in an upright position. If the bar is released from rest in the horizontal position shown, find its angular velocity as it passes the vertical position. Neglect friction effects. 4 Type here to search ThinkVision K - Pan Tab Cape Look Esc Q A Z G FT W S # ONDA 3 F2 E D A $ 4 R F 5 F4 T G XCVB 8 a Y H N P6 F6 U J M F7 K ( F8 F10 F11 +Backspace Enter T F12 Shift Print Screen SysRq Insert 0.5 m Scroll Lock Delete Home Break End Page Up Page Down Naam Lock K 37°F Cloudy Home Lenovo B 20
The solid homogeneous cylinder shown has a mass of 30 kg and is rotating at 1200 rpm clockwise about a fixed horizontal axis through O. The coefficient of kinetic friction between the brake and the cylinder is 0.20. If the tension in the spring when the brake is applied is 100 N, determine the time required for the cylinder to stop rotating. Neglect the thickness of the vertical members. (Draw FBD)
A cylinder is rolling down a plane which has the angle theta with the horisontal. The cylinder starts from rest at height H. You can assume that the plane has the same static and kinetic coefficient of friction. 1. Draw the free body diagram of the forces acting on the cylinder while rolling, be sure you indicate the direction of the centre of mass 2. Write down an expression for the minimum coefficient of friction which ensures that the cylinder rolls and does not slip 3. The cylinder now rolls onto a flat surface. What is the speed of the centre of mass?
A 15-kg uniform disk is placed in contact with the ground and a constant couple moment M = 32 N.m is applied to it as shown. The weight of link AB is negligible. If the coefficient of kinetic friction at D is 0.3, find the angular acceleration of the disk. write the answer in rad/s? but do not write the units. R = 0.25 m A Taylor Answer:
In a porter governor the mass of the central load is 18 kgand the mass of each ball is 2kg. the top arms (254) mm while the bottom arms are (304) mm long. The friction of the sleeve is 20 N. If the top arms make 45 deg with the axis of rotation in the equilibrium position, find the range of the speed of the governor in that position
The 13-kg wheel is rolling under the constant moment of M= 89 N·m. The wheel has radius r= 0.47 m, has mass center at point G, and the radius of gyration is kG = 0.28 m. The coefficients of friction between the wheel and the ground is ls = 0.26 and uk = 0.15. If the wheel rolls while slipping, determine the angular acceleration of the wheel (in rad/s2). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s2. M Your Answer: Answer
The 17-kg wheel is rolling under the constant moment of M = 85 N-m. The wheel has radius r= 0.50 m, has mass center at point G, and the radius of gyration is kg = 0.20 m. The coefficients of friction between the wheel and the ground is ls = 0.27 and Hk; = 0.22. If the wheel rolls while slipping, determine the angular acceleration of the wheel (in rad/s?). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s?. M G
In Fig. 5-14, the two boxes have identical masses of 40 kg. Both experience a sliding friction force with u 0.15. Find the acceleration of the boxes and the tension in the tie cord. 08T 30 30 0.Sme Fig. 5-14 Note: Draw the free-body diagram for objects A and B.
The 16-kg wheel is rolling under the constant moment of M = 60 N-m. The wheel has radius r= 0.50 m, has mass center at point G, and the radius of gyration is kg = 0.23 m. The coefficients of friction between the wheel and the ground is ls = 0.28 and Uk = 0.14. If the wheel rolls without slipping, determine the angular acceleration of the wheel (in rad/s?). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s?. M
A couple of figure skaters are executing a move called the "death spiral" as shown in the image below. The male skater on the left is swinging his partner around him on the ice and we can assume that he is rotating without translating. The coefficient of friction between the female's skates and the ice is 0.02. The male skater is applying a constant moment of 8 lb-ft about the axis of rotation to keep the spin going. If the couple is initially spinning at 5 rad/s, calculate their final angular velocity after 6 seconds. Simplify this problem and treat the female as a 140 lb particle that is spinning 6' from the axis of rotation only in the horizontal plane. For full credit, draw an FBD and clearly define your system using polar coordinates. 8 lb-ft Axis of Rotation 6 ft 11:38 AM Type here to search 58°F Partly sunny 3/30/г022