A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is
A) 0 N.
B) 5 N.
C) 25 N.
D) 150 N.
Answer: B
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The unusually bright centers found in some galaxies are called
A) active galactic nuclei. B) halos. C) supermassive black holes. D) starbursts.
In Bt corn, genetic material from a bacterium has been put into the corn itself. What consequences might ensue?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. A particle’s Newtonian x-momentum 
is always either equal to or smaller than the x component of the particle’s four-momentum px
2. A particle’s mass is always either equal to or smaller than the time-component of its four-momentum
3. The absolute value of the x component of a particle’s four-momentum vector is always either equal to or smaller than its t component
4. The squared magnitude of a four-vector could be negative.
5. The squared magnitude of a particle’s four-momentum could be negative.
The rigid object shown is rotated about an axis perpendicular to the paper and through point P. The total kinetic energy of the object as it rotates is equal to 1.4 J. If M = 1.3 kg and L = 0.50 m, what is the angular velocity of the object? Neglect the mass of the connecting rods and treat the masses as particles.
A. 1.3 rad/s B. 1.5 rad/s C. 1.7 rad/s D. 1.2 rad/s E. 2.1 rad/s