The planet whose surface is hidden by clouds is
•
•(a) Earth
•(b) Mars
•(c) Jupiter
•(d) Venus
d
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Addition by 1. Components: The figure shows four vectors, 
, 
, 
, and 
, having magnitudes 10.0 m, 8.00 m, 6.00 m, and 2.00 m, respectively. Find the magnitude of the sum of these four vectors.
Fill in the blank(s) with the appropriate word(s).
Characteristics of Waves: 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
The energy used by a 100-watt light bulb in 1 hour is 360,000 joules
a. True b. False Indicate whether the statement is true or false
Suppose it were possible to drill a frictionless cylindrical channel along a diameter of the Earth from one side of the Earth to another. A body dropped into such a channel will only feel the gravitational pull of mass within a sphere of radius equal to the distance of the mass from the center of the Earth. The density of the Earth is 5.52 × 10^3 kg/m3 and G = 6.67 × 10^-11 N×m2/kg2 . The mass
will oscillate with a period of a. 84.4 min. b. 169 min. c. 24.0 h. d. 1 130 h. e. 27.2 d.