The neutral carbon atom consists of
a. one proton and one neutron.
b. six protons.
c. one proton, one neutron, and one electron.
d. six protons and six electrons.
e. an isotope and an ion.
d
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A 4.0 kg object is moving at 5.0 m/s NORTH. It strikes a 6.0 kg object at rest. The objects have an elastic collision and move in the NORTH or SOUTH direction. The velocity of the 4.0 kg object after the collision is
A. 1.0 m/s NORTH. B. 4.0 m/s NORTH. C. 1.0 m/s SOUTH. D. 4.0 m/s SOUTH. E. 0 m/s.
The largest difference between Mars' northern and southern hemispheres is that
A) the northern is higher overall, despite some high volcanoes in the south. B) the northern has all the outflows and must have been much hotter. C) the southern has a polar cap, but none ever forms in the north. D) the southern is much darker, with large mare-like basaltic lava flows. E) the southern appears older, with more impact craters.
Incompressible water flows out of a large reservoir through a pipe that opens to the atmosphere 5.70 m below the level of the water in the reservoir. What is the speed of the water as it comes out of the pipe?
A) 1.72 m/s B) 7.47 m/s C) 55.8 m/s D) 10.6 m/s E) 27.9 m/s
The intensity of a 50-dB whistle is doubled. What is the new decibel level?
a. 50 dB b. 47 dB c. 53 dB d. 100 dB