When an object is at rest on the Earth, the gravitational force disappears
Indicate whether the statement is true or false
FALSE
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What type of geological activity is seen on Neptune's moon Triton?
a. Plate tectonics and earthquakes are a common occurrence on Triton. b. Volcanoes of molten lava, similar to Earth, have been seen there. c. Geysers of liquid nitrogen are seen erupting from its surface. d. Geysers of liquid water are seen erupting from its surface.
Water pressurized to 3.00 × 10^5 Pa is flowing at 5.25 m/s in a pipe which contracts to 1/2 of its former area. What are the pressure and speed of the water after the contraction? (Density of water = 1 × 10^3 kg/m3.)
a. 2.59E+5 Pa, 10.5 m/s b. 3.00E+5 Pa, 2.63 m/s c. 3.00E+5 Pa, 10.5 m/s d. 4.59E+5 Pa, 10.5 m/s e. 2.59E+5 Pa, 2.63 m/s
If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in
A) a curved path. B) an outward spiral path. C) an inward spiral path. D) a straight-line path.
Which of the following observational techniques is most appropriate for measuring Doppler shifts?
A) timing (measuring how the amount of light changes with time) B) imaging (taking a picture) C) spectroscopy (taking a spectrum)