Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
a. 0
b. 1 N/C
c. 2 N/C
d. 4 N/C
e. More information is needed to find the resulting field magnitude at this position.
c
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When an aging massive star generates an iron core, the iron cannot fuse and thus the star cannot support its weight outside the core. The star is no longer in hydrostatic equilibrium and collapses, forming a supernova
a. True b. False Indicate whether the statement is true or false
To be dimensionally consistent, velocity [L/T], acceleration 
and time [T] must be related as follows.
a. 
b. 
c. 
d. 
Two blocks of masses 20 kg and 9.0 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 9.0-kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.80 m/s2, what is the tension in the second string attached to the 9.0-kg mass?
a. 23 N b. 14 N c. 16 N d. 7.2 N e. 25 N
When an object floats in a liquid, the buoyant force is ____________ the weight of the object
a. equal to b. larger than c. smaller than d. not related to