Question

Asked Dec 12, 2019

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1.A vault is opened by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges. Find the torque due to this force about an axis through the hinges.

a. 120 N⋅m

b. 240 N⋅m

c. 300 N⋅m d. 360 N⋅m

2.A meter stick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 20-cm and 80-cm marks, respectively. Where should Doug hang a third mass of 0.30 kg to keep the stick balanced?

a. 20cm

b. 70cm c. 30cm d. 25cm

3.A copper wire of length 2.0 m, cross sectional area 7.1 × 10−6 m2 and Young's modulus 11 × 1010 N/m2 has a 200-kg load hung on it. What is its increase in length? (g = 9.8 m/s2)

a. 0.50 mm

b. 1.0 mm

c. 2.5 mm d. 5.0 mm

Step 1

1.Write the expression for torque.

Step 2

- The third mass is 0.30kg must be on the left side. The torque about the pivot is equal to zero. Let x be the distance from left end.

Step 3

Thus option (c) is the correct answer. Thus Dong shou...

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