Answer number 18 13. Freddy who weights 20kg, sits on one side of the seesaw which is 3.5m away from the center. His father sitson the other side and balances the seesaw. If his Father weights 70kg, how far away from the center is hesitting?14. A Steel wire 3 ft long and a copper wire 2 ft long each 0.20in? in cross section, are fastened together end to endand are then subjected to a Tension of 200lbs. Calculate the elongation of each wire if the young's modulus of steelis 29x10 and 19x10 for copper. (*15. What is the absolute pressure at the bottom of a 10m water tank?16. A 20kg block of Aluminum (p=2700kg/m is about to be pulled out from the bottom of the sea. What is thetension in the hoisting cable when the block is still at rest? (17. A system of weight 7 Kg is heated from its initial temperature of 10°C to its final temperature of 30°C. Findout the total heat obtained by the system. Note that the specific heat of the system is 0.45 kJ per Kg K.18. The color orange within the visible light spectrum has a wavelength of about 620 nanometers or 620 x10meters and the speed of light waves is a constant value of 3.0x10®m/s. What is the frequency of orange light?

Given, Wavelength, λ=620 nm=620×10-9 m Speed of light, c=3×108 m/s

18. The color orange within the visible light spectrum has a wavelength of about 620 nanometers or 620 x10° meters and the speed of light waves is a constant value of 3.0x10*m/s. What is the frequency of orange light?

18. The color orange within the visible light spectrum has a wavelength of about 620 nanometers or 620 x10° meters and the speed of light waves is a constant value of 3.0x10*m/s. What is the frequency of orange light?

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 21PE: a) What is the mechanical advantage of a wheelbarrow, such as the one in Figure 9.24, if the center...

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Two children of mass 20.0 kg and 30.0 kg sit balanced on a seesaw with the pivot point located at the center of the seesaw. If the children are separated by a distance of 3.00 m, at what distance from the pivot point is the small child sitting in order to maintain the balance?
What three factors affect the torque created by a force relative to a specific pivot point?
Torque and the Two Conditions for Equilibrium 17. The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force Ft, in the deltoid muscle and the force Fs exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
Torque and the Two Conditions for Equilibrium 17. The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force Ft, in the deltoid muscle and the force Fs exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
A person carries a plank of wood 2.00 m long with one hand pushing down on it at one end with a force F1 and the other hand holding it up at .500 m from the end of the plank with force F2. If the plank has a mass of 20.0 kg and its center of gravity is at the middle of the plank, what are the magnitudes of the forces F1 and F2?
A person stands a distance R from a doors hinges and pushes with a force F directed perpendicular to its surface. By what factor does the applied torque change if the persons position and force change to (a) 2R and 2F, (b) 2R and F, (c) R and F/2, (d) R/2 and F/2?
a) What is the mechanical advantage of a wheelbarrow, such as the one in Figure 9.24, if the center of gravity of the wheelbarrow and its load has a perpendicular lever arm of 5.50 cm, while the hands have a perpendicular lever arm of 1.02 m? (b) What upward force should you exert to support the wheelbarrow and its load if their combined mass is 55.0 kg? (c) What force does the wheel exert on the ground? Figure 9.24 (a) In the case of the wheelbarrow, the output force or load is between the pivot and the input force. The pivot IS the wheel's axle. Here, the output force is greater than the input force. Thus, a wheelbarrow enables you to lift much heavier loads than you could with your body alone. (b) In the case of the shovel, the input force is between the pivot and the load, but the input lever arm is shorter than the output lever arm. The pivot is at the handle held by the right hand. Here, the output force (supporting the shovel's load) is less than the input force (from the hand nearest the load), because the Input is exerted closer to the pivot than is the output
The fishing pole in Figure P10.28 makes an angle of 20.0 with the horizontal. What is the torque exerted by the fish about an axis perpendicular to the page and passing through the anglers hand if the fish pulls on the fishing line with a force F = 100 N at an angle 37.0 below the horizontal? The force is applied at a point 2.00 in from the anglers hands.
(a) When opening a door, you push on it perpendicularly with a force of 55.0 N at a distance of 0.850m from the hinges. What torque are you exerting relative to the hinges? (b) Does it matter if you push at the same height as the hinges?
A person balances a meterstick in a horizontal position on the extended index fingers of her right and left hands. She slowly brings the two fingers together. The stick remains balanced, and the two fingers always meet at the 50-cm mark regardless of their original positions. (Try it!) Explain why that occurs.
Suppose a 900-kg car is on the bridge in Figure 9.34 with its center of mass halfway between the hinges and the cable attachments. (The bridge is supported by the cables and hinges only.) (a) Find the force in the cables. (b) Find the direction and magnitude of the force exerted by the hinges on the bridge.
(a) Give an example in which the net force acting on an object is zero, yet the net torque is nonzero, (b) Give an example in which the net torque acting on an object is zero, yet the net force is nonzero.