A 0.600-mm diameter wire stretches 0.500% of its length when it is stretched with a tension of 20.0 N. What is the Young's modulus of this wire?
A) 5.66 × 1010 N/m2
B) 3.54 × 109 N/m2
C) 1.41 × 1010 N/m2
D) 6.43 × 109 N/m2
E) 2.78 × 109 N/m2
Answer: C
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An electric motor draws a current of 2.60 A from a 18.0-V battery when it runs at normal speed. If the motor's armature is "jammed" so that it cannot rotate, the current suddenly rises to 10.0 A. What is the back emf of the motor when running at normal speed?
a. 4.68 V b. 10.0 V c. 22.7 V d. 13.3 V e. 133 V
The Moon's reflected image in a lake often appears as a vertical column when the water is
A) perfectly still. B) slightly rough. C) very rough, churning with waves.
A 2.0-kg mass swings at the end of a light string (length = 3.0 m). Its speed at the lowest point on its circular path is 6.0 m/s. What is its kinetic energy at an instant when the string makes an angle of 50° with the vertical?
a. 21 J b. 15 J c. 28 J d. 36 J e. 23 J
Which of the following are not inertial reference frames?
1) a desk on the floor 2) a car going around a curve 3) an airplane taking off 4) a car traveling at a constant velocity 5) a moving sidewalk