Satellite Motion: A satellite of mass 500 kg orbits the earth with a period of 6000 s. The earth has a mass of 5.97 × 1024 kg, a radius of 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2.(a) Calculate the magnitude of the earth's gravitational force on the satellite.(b) Determine the altitude of the satellite above the earth's surface.
What will be an ideal response?
(a) 3900 N (b) 7.5 × 105 m
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If nuclear reactions in the core produce harmful gamma rays, why are Earthlings not destroyed?
A: Our super skin protects us. B: We are continually destroyed and then regenerated without knowing it. C: The reactions really produce yellow light, not gamma rays. D: The gamma rays are converted to visible light by the time they reach the photosphere. E: None of the above.
Which of the following statements is incorrect?
a.
Capacitance is always positive.
b.
The symbol for potential difference between the plates of a capacitor is 
.
c.
Water is a polar molecule.
d.
When a dielectric is placed in a capacitor it serves to reduce the electric field.
e.
Nonpolar molecules cannot be used for dielectric material in a capacitor.
A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75.0°C, into a 250-g aluminum cup, initially at 16.0°C
What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/(kg?K). Assume that the specific heat of coffee is the same as the specific heat of water. A) 45.5°C B) 62.0°C C) 65.0°C D) 68.0°C E) 71.0°C
If a wave from one slit of a Young's double-slit set-up arrives at a point on the screen one-half wavelength behind the wave from the other slit, what is observed at that point?
a. dark fringe c. gray fringe, neither dark nor bright b. bright fringe d. multi-colored fringe