The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. field strength
c. both A and B
b. current strength
d. None of the above are valid.
C
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A block of mass m = 8.40 kg, moving on a horizontal frictionless surface with a speed 4.20 m/s, makes a perfectly elastic collision with a block of mass M at rest
After the collision, the 8.40 block recoils with a speed of 0.400 m/s. In the figure, the blocks are in contact for 0.200 s. The magnitude of the average force on the 8.40-kg block, while the two blocks are in contact, is closest to A) 193 N. B) 185 N. C) 176 N. D) 168 N. E) 160 N.
Saturn's larger satellites have lower average density than the Galilean satellites of Jupiter; therefore, we can conclude that Saturn's satellites contain less rock and more ice than the Galilean satellites.
Answer the following statement true (T) or false (F)
Which Lagrange points in the Earth—Moon system are stable?
A) L1 only B) L4 and L5 C) L2 and L3 D) all are stable
What are cosmic rays?
A) subatomic particles that travel close to the speed of light B) a form of light with shorter wavelength than gamma rays C) fast-moving dust particles in the interstellar medium D) any light waves from space