Which of the following statements about supports is true? O A. A roller support permits motion on both the horizontal and vertical axes. O B. A hinge support inhibits motion on both the horizontal and vertical axes. O C. A hinge support should always have a non-zero magnitude of the x-component of the reaction force, Ry. O D. Both B and C are true. O E. none of the choices

Which of the following statements about supports is true? O A. A roller support permits motion on both the horizontal and vertical axes. O B. A hinge support inhibits motion on both the horizontal and vertical axes. O C. A hinge support should always have a non-zero magnitude of the x-component of the reaction force, Ry. O D. Both B and C are true. O E. none of the choices

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter9: Statics And Torque

Section: Chapter Questions

Problem 10CQ: Suppose you pull a nail at a constant rate using a mall puller as shown in Figure 9.23. Is the nail...

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A 15.0-m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 60.0 angle with the horizontal. (a) Kind the horizontal and vertical forces the ground exerts on the base of the ladder when an 800-N firefighter has climbed 4.00 m along the ladder from the bottom. (b) If the ladder is just on the verge of slipping when the firefighter is 9.00 m from the bottom, what is the coefficient of static friction between ladder and ground?
A person working at a drafting board may hold her head as shown in Figure 9.40, requiring muscle action to support the head. The three major acting forces are shown. Calculate the direction and magnitude of the force supplied by the upper vertebrae FV to hold the head stationary, assuming that this force acts along a line through the center of mass as do the weight and muscle force.
Suppose you pull a nail at a constant rate using a mall puller as shown in Figure 9.23. Is the nail puller in equilibrium? What if you pull the nail with some acceleration -is the nail puller in then? In which case is the force applied to the nail puller larger and why? Figure 9.23 A nail puller is a lever with a large mechanical advantage. The external forces on the nail puller are represented by solid arrows. The force that the nail puller applies to the nail (Fo) is not a force on the nail puller. The reaction force the nail exerts back on the puller (Fn) is an external force and is equal and opposite to Fo. The perpendicular lever arms of the input and output forces are li and l0
A 160-N child sits on a light swing and is pulled back and held with a horizontal force of 120 N.The magnitude of the tension force of each of the two supporting ropes in newtons is: Answer must be according the correct signifcant numbers.
A 180-kg horizontal beam is supported at the ends AA and BB. A 350-kg piano rests a quarter of the way from the end A. a)Determine the magnitude of the vertical force on the support at A. b)Determine the magnitude of the vertical force on the support at B.
A 14.0-m uniform ladder weighing 480 N rests against a frictionless wall. The ladder makes a 57.0° angle with the horizontal. (a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when an 850-N firefighter has climbed 4.10 m along the ladder from the bottom.what is the magnitude of the horizontal force in newtons and what is its direction? what is the magnitude of the vertical force in newtons and what is its direction? (b) If the ladder is just on the verge of slipping when the firefighter is 9.30 m from the bottom, what is the coefficient of static friction between ladder and ground?
A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 300 N and is 4.50 m long. What is the tension in each rope when the 600-N worker stands 1.30 m from one end? Make use of the situations in this scenario and tell us a story of your own that involves a similar type of static equilibrium. You may use approximate values to solve your own problem.
66. A cable can support only a compressive or “pulling” force. True False 67. In equilibrium, ΣF includes all the known and unknown forces which act on the particle. True False
A hungry bear weighing 700. N walks out on a beam in an attempt to retrieve a basket of goodies hanging at the end of the beam. The beam is uniform, weighs 200. N, and is 6.00 m long, and it is supported by a wire at an angle of 60°. The basket weighs 80.0 N. a. Draw a force diagram for the beam. b. When the bear is at 1.00 m, find the tension in the wire supporting the beam and the components of the force exerted by the wall on the left end of the beam. c. If the wire can withstand a maximum tension of 900. N, what is the maximum distance the bear can walk before the wire breaks?
A 12 000-N shark is supported by a rope attached to a 4.60-m rod that can pivot at the base. (a) Calculate the tension in the cable between the rod and the wall, assuming the cable is holding the system in the position shown in the figure. (Give you answer to three significant digits.) b) Find the horizontal force exerted on the base of the rod magnitude ------- N c) Find the vertical force exerted on the base of the rod. Ignore the weight of the rod. magnitude ------ N
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