What can we learn from studying a planet's magnetic field?
What will be an ideal response?
Planetary magnetic fields are created in their metallic inner cores. From studying magnetic fields we can learn about the size and fluidity of their cores, which in turn gives clues as to their formation.
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Density waves may explain:
A) the lack of blue stars in the halo. B) the random orbits of halo stars. C) the density of red stars in the bulge. D) the spiral arm structure of the Galaxy. E) the large number of open clusters in the halo.
What is the maximum kinetic energy (in eV) of a photoelectron emitted from a surface whose work function is 5.0 eV when illuminated by a light whose wavelength is 200 nm?
a. 1.9 b. 1.2 c. 3.1 d. zero e. 6.2
A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?
a. 14 N b. 12 N c. 16 N d. 18 N e. 25 N
A quantity that is measured in ohms is
a. voltage b. current c. resistance d. electric field e. critical temperature