Question

REWRITE THIS PROCEDURE IN OWN WORDS

Procedure

1.Set clamp A on the boom to approximately the 40 cm position. Weigh the boom (including the clamp and pin) on the triple-beam balance. Record this weight in gwt on the data sheet as w. Balance the boom on a finger and locate its center of gravity. Mark the center of gravity with a pencil, and erase any other markings on the boom

.2.Assemble the crane approximately as shown in Figure 1. A load of 700 to 1200 g should be applied to the weight holder. One end of the spring balance should be directly attached to the hook on clamp C on the vertical pole. The other end of the spring balance should be attached through a string or loop of string to clamp A on the boom. The top of the weight hanger should be below the lower end of the boom. Adjust clamp C until the string between the balance and the boom is accurately horizontal. Hold a plumb line near that string and look for an equality of the four right angles. The boom should make an angle of between 30o and 60o with the horizontal. If it does not, change the length of string between the balance and clamp A on the boom; then readjust clamp C on the vertical pole until that string is again horizontal.

3.Record the load force L in gwt. Remember to include the weight of the weight hanger along with that of the slotted weights.

4.Momentarily release the tension applied to the spring balance by tilting the boom slightly while supporting the balance in its original position with one hand. Take a zero reading to be used for correcting future readings and record the zero reading of the balance on scratch paper; or alternately adjust the balance until it reads zero. Release the boom; and then pull down on it slightly to slightly increase the reading of the balance. Next, slowly release the force applied to the boom and remove your hands from the apparatus. This procedure will cause the frictional force inside the spring balance to have the same direction when the final reading is taken as when the zero reading was taken. Read the force Smeas from the balance and make any required zero corrections on the reading before recording it on the data sheet.the force Smeas from the balance and make any required zero corrections on the reading before recording it on the data sheet.

Answer 1

Solution:

1. Set clamp A to roughly 40 cm position on the boom. Weigh the boom on the triple-beam balance including the clamp and the pin and record this weight in gwt ,by denoting it as w in the datasheet. Mark the center of gravity with a pencil after balancing the boom on a finger and locating it. Then eradicate any other marking s on the boom.

2. Construct the crane just like as shown in Figure 1. Apply a load of 700-1200g to the weight holder while one end of the spring balance directly attached to the hook on the clamp C on the vertical pole. The opposite end of the spring balance ought to be joined through a string or circle of string to clamp A on the boom. The highest point of the weight holder ought to be underneath the lower end of the boom. Adjust the Clamp C until the string between the balance and the boom is precisely level. Hold a plumb line close to that string and search for equity of the four right edges. The boom should make a point of somewhere in the range of 30o and 60o with the level. In the event that it doesn't, change the length of string between the balance and Clamp A on the boom; at that point straighten out clamp C on the vertical shaft until that string is again level.

3. Record the load force L in gwt and make sure to incorporate the weight of the weight holder alongside that of the slotted weights.

4. Momentarily discharge the pressure applied to the spring balance by inclining the boom somewhat while supporting the balance in its unique situation with one hand. Take a zero reading to be utilized for amending future readings and record the zero perusing of the balance on scratch paper, or on the other hand change the balance until it reads zero. Discharge the boom, and afterward pull down on it marginally to somewhat increasing the reading of the balance. Next, gradually discharge the force applied to the boom and expel your hands from the mechanical assembly. This method will cause the frictional force inside the spring balance to have a similar direction when the last reading is taken as when the zero reading was taken. Account the force Smeas from the balance and make any necessary zero amendments on the reading before recording it on the information sheet.