Which is a characteristic of dwarf planets?
a. They possess an asymmetrical or irregular shape
b. Their orbit is highly elliptical and far from the Sun.
c. They must reside within the Kuiper belt or Oort cloud.
d. They have insufficient gravitational pull to clear their neighborhood.
e. They cross the orbit of other planets during its own revolution.
d
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When salt is introduced to ice, the temperature at which melting occurs is
A) quite unaffected. B) lowered. C) increased. D) dependent on the shape of salt and ice crystals
The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 ?T. What is the magnitude of the electric field for that wave at P? (c = 3.0 × 108 m/s)
A) 745 N/C B) 636 N/C C) 5.23 µN/C D) 7.45 µN/C E) 6.36 µN/C
A charge of 50 nC is uniformly distributed along the y axis from y = 3.0 m to y = 5.0 m. What is the magnitude of the electric field at the origin?
a. 18 N/C b. 50 N/C c. 30 N/C d. 15 N/C e. 90 N/C
Can classical physics be used to accurately describe a satellite moving at a speed of 7500 m/s? Explain why or why not.
A. Speed of light is 3 X 10^(8) m/s. So, 1% of the speed of light is 3 X 10^(6) m/s which is higher than 7500 m/s. The Satellite is big enough to be observable by human eyes. The gravitational force on it due to Earth which is weak. So, a satellite moving at a speed of 7500 m/s can be described accurately by Classical Physics. B. Speed of light is 3e5 m/s. So, 1% of the speed of light is 3e4 m/s which is lower than 7500 m/s. The Satellite is big enough to be observable by human eyes. The gravitational force om it due to Earth which is weak. So, a satellite moving at a speed of 7500 m/s can be described accurately by Classical Physics. C. Speed of light is 3e9 m/s. So, 1% of the speed of light is 3e7 m/s which is higher than 7500 m/s. The Satellite is big enough to be observable by human eyes. The gravitational force om it due to Earth which is weak. So, a satellite moving at a speed of 7500 m/s cannot be described accurately by Classical Physic