If the net force on a body is zero the net torque ________ (is always, is not necessarily, cannot be) zero.
Fill in the blank(s) with the appropriate word(s).
is not necessarily
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A series LR circuit includes a 9.0 V battery, a resistance of 0.50 
and an inductance of 0.80 H. What is the induced emf 2.0 s after the switch has been closed?
A. 0.0 B. 9.0 V C. 5.2 V D. 2.6 V E. 19 mV
A positively charged ion is called a(n) ______________
Fill in the blank(s) with correct word
A concave mirror has a 12 cm tall object placed 40 cm in front of it. An image forms 60 cm in front of the mirror. What is the size and orientation of the image?
A. 8.0 cm, inverted B. 8.0 cm, upright C. 18 cm, inverted D. 18 cm, upright E. 24 cm, upright
An athlete stretches a spring an extra 40.0 cm beyond its initial length. How much energy has he transferred to the spring, if the spring constant is 52.9 N/cm?
A) 423 J B) 423 kJ C) 4230 kJ D) 4230 J