COLLEGE PHYSICS:STRATEGIC APPR.AP ED.
4th Edition
ISBN: 9780137574728
Author: Knight
Publisher: PEARSON
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Question
Chapter 8, Problem 3P
To determine
To find: The distance that the man can stand close to the right edge of the picnic table without the table tipping over.
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How close to the right edge of the 56 kg picnic table shown can a 70 kg man stand without the table tipping over? Hint: When the table is just about to tip, what is the force of the ground on the table’s left leg?
A 25.0 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole, as
shown in Figure P8.22. A cable at an angle of 30.0° with the beam helps to support the light.
30,0%
Figure P8.221
(a) Find the tension in the cable.
N
(b) Find the horizontal and vertical forces exerted on the beam by the pole.
horizontal
N (to the right)
vertical
N (upward)
When you carry shopping bags, rather than grasp the handles with your hand as in Q8.14a, you might choose to put them over your arm and slide the handle toward your elbow as in Q8.14b. Explain why this leads to less muscle effort to carry the bags and less force in your elbow joint.
Chapter 8 Solutions
COLLEGE PHYSICS:STRATEGIC APPR.AP ED.
Ch. 8 - Prob. 1CQCh. 8 - Could a ladder on a level floor lean against a...Ch. 8 - Prob. 3CQCh. 8 - Prob. 4CQCh. 8 - Prob. 5CQCh. 8 - Prob. 6CQCh. 8 - Prob. 7CQCh. 8 - A spring exerts a 10 N force after being stretched...Ch. 8 - Prob. 9CQCh. 8 - A typical mattress has a network of springs that...
Ch. 8 - Take a spring and cut it in half to make two...Ch. 8 - A wire is stretched right to its breaking point by...Ch. 8 - Prob. 13CQCh. 8 - Prob. 14CQCh. 8 - Steel nails are rigid and unbending. Steel wool is...Ch. 8 - Two children hold opposite ends of a lightweight,...Ch. 8 - Prob. 19MCQCh. 8 - Prob. 20MCQCh. 8 - Prob. 21MCQCh. 8 - Prob. 22MCQCh. 8 - Prob. 23MCQCh. 8 - Prob. 24MCQCh. 8 - Prob. 25MCQCh. 8 - Prob. 26MCQCh. 8 - You have a heavy piece of equipment hanging from a...Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Youre carrying a 3.6-m-long, 25 kg pole to a...Ch. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 9PCh. 8 - Prob. 11PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - The stability of a vehicle is often rated by the...Ch. 8 - Prob. 18PCh. 8 - A car manufacturer claims that you can drive its...Ch. 8 - Prob. 20PCh. 8 - An orthodontic spring, connected between the upper...Ch. 8 - Prob. 22PCh. 8 - Experiments using optical tweezers measure the...Ch. 8 - Prob. 24PCh. 8 - One end of a 10-cm-long spring is attached to the...Ch. 8 - Prob. 26PCh. 8 - A spring has an unstretched length of 10 cm. It...Ch. 8 - A spring stretches 5.0 cm when a 0.20 kg block is...Ch. 8 - You need to make a spring scale to measure the...Ch. 8 - Prob. 30PCh. 8 - A force stretches a wire by 1.0 mm. a. A second...Ch. 8 - Prob. 32PCh. 8 - What hanging mass will stretch a 2.0-m-long,...Ch. 8 - An 80-cm-long, 1.0-mm-diameter steel guitar string...Ch. 8 - A mineshaft has an ore elevator hung from a single...Ch. 8 - The normal force of the ground on the foot can...Ch. 8 - A three-legged wooden bar stool made out of solid...Ch. 8 - Prob. 38PCh. 8 - Prob. 39PCh. 8 - Prob. 40PCh. 8 - A glass optical fiber in a communications system...Ch. 8 - The Achilles tendon connects the muscles in your...Ch. 8 - Prob. 44PCh. 8 - Prob. 47PCh. 8 - Prob. 48PCh. 8 - Prob. 49PCh. 8 - Prob. 51GPCh. 8 - Prob. 52GPCh. 8 - Prob. 53GPCh. 8 - Prob. 55GPCh. 8 - Two identical, side-by-side springs with spring...Ch. 8 - Prob. 57GPCh. 8 - Prob. 58GPCh. 8 - Prob. 59GPCh. 8 - A 25 kg child bounces on a pogo stick. The pogo...Ch. 8 - Prob. 61GPCh. 8 - In the hammer throw, an athlete spins a heavy mass...Ch. 8 - There is a disk of cartilage between each pair of...Ch. 8 - Orb spiders make silk with a typical diameter of...Ch. 8 - Larger animals have sturdier bones than smaller...Ch. 8 - Prob. 67GPCh. 8 - Prob. 68GPCh. 8 - Prob. 69MSPPCh. 8 - Prob. 70MSPPCh. 8 - Prob. 71MSPPCh. 8 - Prob. 72MSPP
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Similar questions
- The chewing muscle, the masseter, is one of the strongest in the human body. It isattached to the mandible (lower jawbone) as shown in Figure P8.33a. The jawbone ispivoted about a socket just in front of the auditory canal. The forces acting on the jawboneare equivalent to those acting on the curved bar in Figure P8.33b.arrow_forwardIf you are using a rope to raise a tall mast, attaching the rope to the middle of the mast as in Q8.3a gives a very small torque about the base of the mast when the mast is at a shallow angle. You can get a larger torque by adding a pole with a pulley on top, as in Q8.3b. Draw a diagram showing all of the forces acting on the mast and explain why, for the same tension in the rope, adding this pole increases the torque on the mast.arrow_forwardWhat is the student’s weight?arrow_forward
- A woman weighing 580 N does a pushup from her knees, as shown. What are the normal forces of the floor on (a) each of her hands and (b) each of her knees?arrow_forwardA thin 2.00 kg box rests on a 6.00 kg board that hangs over the end of a table, as shown. How far can the center of the box be from the end of the table before the board begins to tilt?arrow_forwardFigure P8.76 shows a clawhammeras it is being used to pull anail out of a horizontal board.If a force of magnitude 150 N isexerted horizontally as shown,find (a) the force exerted bythe hammer claws on the nailand (b) the force exerted bythe surface at the point of contactwith the hammer head.Assume that the force thehammer exerts on the nail isparallel to the nail and perpendicularto the position vector fromthe point of contact.arrow_forward
- A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 6.56 g coins stacked over the 20.5 cm mark, the stick is found to balance at the 32.4 cm mark. What is the mass of the meter stick? Number Unitsarrow_forwardFigure P8.29 shows a uniformbeam of mass m pivoted atits lower end, with a horizontalspring attached between its topend and a vertical wall. Thebeam makes an angle θ with thehorizontal. Find expressions for(a) the distance d the spring isstretched from equilibrium and(b) the components of the forceexerted by the pivot on thebeam.arrow_forwardIf you hold your arm outstretched with palm upward, as shown, the force to keep your arm from falling comes from your deltoid muscle. The arm of a typical person has mass 4.0 kg and the distances and angles shown in the figure.a. What force must the deltoid muscle provide to keep the arm in this position?b. By what factor does this force exceed the weight of the arm?arrow_forward
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