The uncharged particle inside an atom is a neutron
a. True
b. False
Indicate whether the statement is true or false
True
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Why are collisions between galaxies more likely than collisions between stars within a galaxy?
A) Galaxies have higher redshifts than stars. B) Galaxies travel through space much faster than stars. C) Galaxies are much larger than stars. D) Relative to their sizes, galaxies are closer together than stars.
A straight wire is bent into the shape shown. Determine the net magnetic force on the wire
when the current I travels in the direction shown in the magnetic field
.
?
a.
2IBL in the ?z direction
b.
2IBL in the +z direction
c.
4IBL in the +z direction
d.
4IBL in the ?z direction
e.
zero
A displacement vector D is given as 40.0 m long at an angle of 60.0 degrees NORTH of EAST. The 
component and the 
component of the vector are
A. 
= +34.6 m,
= +20.0 m.
B. = +20.0 m,
= -34.6 m.
C. 
= -34.6 m,
= +20.0 m.
D. 
= -34.6 m, 
= +20.0 m.
E. 
= +34.6 m, 
= -20.0 m.
Mort stands on Earth. Velma moves away from him in a rocket at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma
As the tip of the beam passes her rocket, Mort observes the beam to move just 1000 km/s faster than Velma, while Velma observes the beam to move at 300,000 km/s. Whose observation is correct? A) Mort's B) Velma's C) both D) neither