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Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 4STP

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Similar questions

A pencil rests against a corner, as shown below. The sharpened end of the pencil touches a rough horizontal floor. The coefficient of static friction between the eraser and the floor is s=0.80 . The center of mass the pencil is located 9.0cm from the tip of the eraser and 11.0cm from the tip of the pencil lead. Find the minimum angle for which the pencil does not slip.
What is true about the constant G? (3.5) (a) It is a very small quantity. (b) It is a force. (c) It is the same as g. (d) It decreases with altitude.
Scissors are like a double-lever "Stem, Which of the Simple machines in Figure 9.23 and Figure 9.24 is most analogous to scissors? 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 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
A cube of side a is cut out of another cube of side b as shown in the figure below. Find the location of the center of mass of the structure. (Hint: Think of the missing part as a negative mass overlapping a positive mass.)
Scissors for cutting paper have long blades and short handles, whereas metal-cutting shears have long handles and short blades. Bolt cutters have very long handles and very short blades. Why is this so?
A wind turbine has 12,000 kgkg blades that are 40 mm long. The blades spin at 21 rpm.
A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.95 g coins stacked over the 32.4 cm mark, the stick is found to balance at the 46.5 cm mark. What is the mass of the meter stick? Number Type your answer here Units
The question: Add the following quantities: 4.05 kg + 567.95 g + 100.1 g My solution: 4.05 + 567.95 + 100.1 = 672.1 There are several things wrong with my solution. Tell me what they are.
When we say that light objects and heavy objects fall at the same rate, what assumption are we making? They have the same shape. They are falling in a vacuum. They are made of the same material. They have the same size
Some climbing ropes are designed to noticeably stretch under a load to lessen the forces in a fall. A weight is attached to 10 m length of climbing rope, which then stretches by 20 cm. Now, this single rope is replaced by a doubled rope—two pieces of rope next to each other. How much does the doubled rope stretch?A. 5.0 cmB. 10 cmC. 20 cmD. 40 cm
A grocery bag can withstand 160 force before it rips apart. How many kilograms of apples can safely hold? Use g =9.8 m/s^ 2 Calculate answer to one decimal
It’s an arm day at the gym and all the free weights and machines are taken. You don’t have much time to squeeze in your workout before your next class. Desperate to get your reps in, you see a pile of Therabands (the giant rubber bands used for physical therapy). The bands are 100 mm wide and 1.5 mm thick. You sit down to do some bicep curls with the Theraband tied to rack 60 cm away from your hand and your hand is 80 cm from the floor. However, a single length of the Theraband is too easy to curl, so you end up wrapping it around your hand twice (i.e. you are stretching 4 lengths of Theraband when you do your reps). Your hand starts out 60 cm from the Theraband anchor point before your do your bicep curl (i.e. no stress on the band, band has no slack). You contract your bicep until your forearm is parallel with the floor and hand in the position below and hold static equilibrium. From previous obsessing over your personal biomechanics, you know the following: your arm and hand weigh 2…

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