A wire is 1.50 m long and has a diameter of 1.50 mm. The tensile modulus of the wire is 
If a force of 400 N is applied to end of the wire, then the increase in length of the wire is
A. 5.48 mm.
B. 4.28 mm.
C. 3.95 mm.
D. 3.84 mm.
E. 3.45 mm.
A. 5.48 mm.
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The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW
The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element? A) The power increases to 2.2 kW. B) The power is still 2.0 kW. C) The power decreases to 1.8 kW. D) None of the given answers is correct.
What is the minimum energy needed to lift 1.0 kg to a height of 200. km and to give it a speed of 8.0 km/s? (Neglect the small decrease of "g" over that distance.)
A) 34. TJ B) 34. kJ C) 34. MJ D) 34. GJ E) 34. J
In a collision between two objects of unequal mass, which object receives a greater magnitude impulse?
A) the object of larger mass B) the object of smaller mass C) They receive equal magnitude impulses.
How many carbon and hydrogen atoms are there in the unit cell of polyethylene shown in Figure 2.21c, assuming that the density of crystalline polyethylene is 0.996 g/cm3 ?
What will be an ideal response?