Which of the following forces is the weakest?
a. strong nuclear
b. weak nuclear
c. electromagnetic
d. gravitational
d
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The strong force is the force that
a. binds electrons to the nucleus in an atom. b. holds the Moon in orbit around Earth. c. creates the magnetic field associated with sunspots. d. produces the extremely high temperatures in the solar corona. e. binds protons and neutrons together to form a nucleus.
An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the
fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake? A) 100 km B) 200 km C) 300 km D) 400 km E) 500 km
Which of the following statements is incorrect?
What will be an ideal response?
A sphere is dropped from a great height and when its speed reaches 20 m/s, its acceleration downward is 8.4 m/s2 . If the drag force is proportional to the square of the speed, what will be its acceleration downward when its speed reached 40 m/s?
a. 2.6 m/s2 b. 4.2 m/s2 c. 8.0 m/s2 d. 0 m/s2 because it has now reached terminal velocity.