1.25 cm 0.8 cm 2.25 cm 0.1 cm 12.5 cm

# 1.25 cm 0.8 cm 2.25 cm 0.1 cm 12.5 cm

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## 1.25 cm 0.8 cm 2.25 cm 0.1 cm 12.5 cm

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1. A 10-m long steel wire (cross – section 1cm2. Young's modulus 2 x 1011 N/m2) is subjected to a load of 25.000 N . How much will the wire stretch under the load? Select the correct answer. • 1.25 cm • 0.8 cm • 2.25 cm • 0.1 cm • 12.5 cm

2. A uniform beam having a mass of 50 kg and a length of 2.7 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam? Select the correct answer. • 0.57 kN • 0.66 kN • 0.39 kN • 0.84 kN • 0.93 kN

3. How large a pressure increase (in ATM ) must be applied to water if it is to be compressed in volume by 3%? The bulk modulus of water is 2 x 109 N/m2 and 1ATM = 105 N/m2 Select the correct answer. • 600 ATM • 570 ATM • 640 ATM • 60 ATM • 6.000 ATM

4. How large a force is necessary to stretch a 1 - mm diameter copper wire (Y = 11 x 1010 N/m2) by 2%? Select the correct answer. • 1.728 N • 2.028 N • 1.328 N • 173 N • 17.280 N

5. A horizontal meter stick supported at the 50 - cm mark, has a mass of 0.20kg hanging from it at the 10 - cm mark and a 0.20 kg mass hanging from it at the 80 - cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.50 kg to keep the meter stick balanced. Select the correct answer. • 54 cm • 49 cm • 64 cm • 69 cm • 74 cm