[a] For Example 10.13 (Calculating the Torque in a Kick) in Section 10.5, replace "2000-N force" with "X-N force" where X is the number you computed on the first page of this study guide. Then solve part (a) of the example. There is no need to solve part (b). X = 883

EXERCISE HINTS: GETTING STARTED I'M STUCK! A man ties one end of a strong rope 7.68 m long to the bumper of his truck, 0.534 m from the ground, and the other end to a vertical tree trunk at a height of 3.86 m. He uses the truck to create a tension of 7.73 x 10 N in the rope. Compute the magnitude of the torque on the tree due to the tension in the rope, with the base of the tree acting as the reference point. N. m

Suppose you exert a force of 192 N tangential to a 0.255 m radius 75.0 kg grindstone (a solid disk). (Give your answers to at least 2 decimal places.) (a)What torque (in N · m) is exerted? (Enter the magnitude.)   (b) What is the angular acceleration (in rad/s2) assuming negligible opposing friction? (Enter the magnitude.)   (c) What is the angular acceleration (in rad/s2) if there is an opposing frictional force of 21.6 N exerted 2.50 cm from the axis? (Enter the magnitude.)

A wrench is used to apply a torque to a bolt. Forces F1 through F6 all have the same magnitude. The point of application of force F1 (and F4) is a distance d from the center of rotation of the bolt. The application points of F1, F2, and F3 are all distance d apart, as shown. Use the convention that counter-clockwise torques are positive; clockwise torques are negative. Determine the torque applied on the bolt by F6 in terms of the variables and angles given in the problem.

Homework

A rectangular bar is hinged at point O.  The bar is 3.00 m long and 2.00 m wide.   Find the torque resulting from the following force about an axis through point O: F1 = 1 N. Use a positive for a counterclockwise torque and a negative for a clockwise torque.

Find Torque ofN, the torque about point P due to the normal force. Express your answer in terms of N and any of the other quantities given in the figure.

A pipe system consists of three pipes with lengths L1 = 1.95 m, L2 = 0.500 m, and L3 = 2.90 m. A plumber pulls on the end of the pipe system, at the point P, with a force Fp = -23.0 Ni+ 42.0 Nj + 32.0 Nk. Po What is the torque 7 due to about the origin? Enter your expression using ijk unit vector notation. N-m

Now that you know how to calculate the torque using components of vector r, plug in values from a trial of your choice.   The mass of the weights in each trial are: Trial 1,3,5,6: 4.54 kg Trial 2,4,6,8: 15.95 kg Hint: How can you use the tools available to measure the perpendicular component of r? (Ruler, Protractor, Vertical Line)