Physics Quiz

What is the weight of an overhead line conductor with a mass of 100kg, assuming the acceleration due to gravity is 9.81 m/s²?

• 981 N

• 100 N

• 9.81 N

• 1000 N

What is the resultant force on the conductor when it is subject to a right angle wind force of 125N?

• 125 N

• 981 N

• 100 N

• 1106 N

Using the formula T = W * L² / 8S, if the span between supports is 100m, the weight of the conductor is 1.5N/m, and the tension is 4.5kN, what is the value of S to 2 decimal places?

• 0.42 m

• 0.417 m

• 0.63 m

• 0.625 m

Given an effort force of 125N and a weight of object 1000N, what is the mechanical advantage of the machine?

• 8

• 15

• 7.5

• 125

If the weight of the object increased but the effort force stayed the same, how would this affect the mechanical advantage (MA)?

• The MA would increase

• The MA would decrease

• The MA would remain the same

• The MA would double

How would the mechanical advantage (MA) change if the effort force required increased but the weight of the object remained constant?

• The MA would increase

• The MA would decrease

• The MA would remain the same

• The MA would be halved

If both the effort force required and the weight of the object increased by 10%, how would the mechanical advantage (MA) be affected?

• The MA would increase by 10%

• The MA would decrease by 10%

• The MA would remain the same

• The MA would increase by 20%

What would be the effect on the force transferred to the nut if a longer spanner was used?

• The force would increase

• The force would decrease

• The force would remain the same

• The force would be halved

Calculate the energy for the work done in raising a load with a mass of 75kg over a height of 30m. (assuming gravity to be 9.81)

Calculate the Power required in raising a load with a mass of 75kg over a height of 30m in a time of 30s. (assuming gravity is 9.81)