Which of the following best describes the origin of ocean tides on Earth?
A) Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the Earth.
B) The Moon's gravity pulls harder on water than on land because water is less dense than rock.
C) Tides are caused by the 23.5-degree tilt of the Earth's rotational axis to the ecliptic plane.
D) Tides are caused on the side of the Earth nearest the Moon because the Moon's gravity attracts the water.
A) Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the Earth.
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A steel plane truss is loaded at B and C by forces P 5 200 kN. The cross-sectional area of each member is A 5 3970 mm2. Truss dimen-sions are H 5 3 m and L 5 4 m. The maximum shear stress in bar AB is approximately:
(A) 27 MPa
(B) 33 MPa
(C) 50 MPa
(D) 69 MPa
On its way to Jupiter, Galileo also gave us close-ups of:
A) Mars and Venus. B) Ceres and Vesta. C) Gaspra and Ida. D) Mathilde and Eros. E) Mercury and Venus.
A cubical box 25.0 cm on each side is immersed in a fluid. The pressure at the top surface of the box is 109.40 kPa and the pressure on the bottom surface is 112.00 kPa. What is the density of the fluid?
A) 1000 kg/m3 B) 1030 kg/m3 C) 1060 kg/m3 D) 1090 kg/m3 E) 1120 kg/m3
If you locate the north celestial pole in your local sky and measure its altitude, then you will know
A) your latitude and longitude. B) your latitude and the direction that is due north for you. C) your longitude and the direction that is due north for you. D) your latitude and the local time. E) your latitude, longitude, and local time.