ssrs code 39

ssrs code 39

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What happens if you and a friend each push a table and exert 100 N of force on it When you and your friend push together, you give the table a greater acceleration than when you push against each other In fact, when you push together, you give the table twice the acceleration that it would have if just one of you applied 100 N of force When you push on the table in opposite directions with the same amount of force, as in Figure 4-5a, the table does not move at all Figure 4-5b and c show free-body diagrams for these two situations Figure 4-5d shows a third free-body diagram in which your friend pushes on the table twice as hard as you in the opposite direction Below each free-body diagram is a vector representing the total result of the two forces When the force vectors are in the same direction, they can be replaced by one vector with a length equal to their combined length When the forces are in opposite directions, the resulting vector is the length of the difference between the two vectors Another term for the vector sum of all the forces on an object is the net force You also can analyze the situation mathematically Assume that you are pushing the table in the positive direction with a 100 N force in the above cases In the first case, your friend is pushing with a negative force of 100 N Adding them together gives a total force of 0 N, which means there is no acceleration In the second case, your friend s force is 100 N, so the total force is 200 N in the positive direction and the table accelerates in the positive direction In the third case, your friend s force is 200 N, so the total force is 100 N and the table will accelerate in the negative direction.

Figure 4-5 Pushing on the table with equal force in opposite directions (a) results in no net force on the table, as shown by the vector addition in the freebody diagram (b) However, there is a net force applied in (c) and (d), as shown by the free-body diagrams

100 N

100 N

Then edit SheetLab_AppDelegate.m, adding the following method implementations:

200 N

100 N

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You could conduct a series of experiments in which you and your friend vary the net force exerted on the table and measure the acceleration in each case You would find that the acceleration of the table is proportional to the net force exerted on it and inversely proportional to its mass In other words, if the net force of you and your friend acting on the table is 100 N, the table will experience the same acceleration as it would if only you were acting on it with a force of 100 N Taking this into account, the mathematical relationship among force, mass, and acceleration can be rewritten in terms of the net force The observation that the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object being accelerated is Newton s second law, which is represented by the following equation Newton s Second Law a

The acceleration of an object is equal to the sum of the forces acting on the object, divided by the mass of the object

Notice that Newton s second law can be rearranged to the form F ma, which you learned about previously If the table that you and your friend were pushing was 150 kg and the two of you each pushed with a force of 500 N in the same direction, what would be the acceleration of the table To find out, calculate the net force, 500 N 500 N 1000 N, and apply Newton s second law by dividing the net force of 1000 N by the mass of the table, 150 kg, to get an acceleration of 667 m/s2 Here is a useful strategy for finding how the motion of an object depends on the forces exerted on it First, identify all the forces acting on the object Draw a free-body diagram showing the direction and relative strength of each force acting on the system Then, add the forces to find the net force Next, use Newton s second law to calculate the acceleration Finally, if necessary, use kinematics to find the velocity or position of the object When you learned about kinematics in s 2 and 3, you studied the motion of objects without regard for the causes of motion You now know that an unbalanced force, a net force, is the cause of a change in velocity (an acceleration)

#import "SheetLab_AppDelegate.h" @implementation SheetLab_AppDelegate - (IBAction)runSaveSheet:(id)sender { NSSavePanel *panel = [NSSavePanel savePanel]; [panel beginSheetForDirectory:nil file:nil modalForWindow:window modalDelegate:self didEndSelector:@selector(savePanelDidEnd:returnCode:contextInfo:) contextInfo:NULL]; } - (void)savePanelDidEnd:(NSSavePanel *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo { if (returnCode==NSOKButton) { NSRunAlertPanel(@"Saving! (just pretending)", @"You chose to save in the file:\n\n%@", nil, nil, nil, [sheet filename]); } } @end

6 Two horizontal forces, 225 N and 165 N, are exerted on a canoe If these forces are applied in the same direction, find the net horizontal force on the canoe 7 If the same two forces as in the previous problem are exerted on the canoe in opposite directions, what is the net horizontal force on the canoe Be sure to indicate the direction of the net force 8 Three confused sleigh dogs are trying to pull a sled across the Alaskan snow Alutia pulls east with a force of 35 N, Seward also pulls east but with a force of 42 N, and big Kodiak pulls west with a force of 53 N What is the net force on the sled

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