You use a spring scale to suspend an object. The spring scale reads 7.84 N when the object is in air and 6.86 N when the object is immersed in water of density 1000 kg/m3. What is the density of the object?
A) 6000 kg/m3
B) 7000 kg/m3
C) 8000 kg/m3
D) 9000 kg/m3
C
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The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.
__________ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center
a. The Hubble constant b. A galaxy's color c. A galaxy's rotation curve d. A galaxy's diameter e. The velocity dispersion method
Which of the following statements about matter-antimatter engines is not true?
A) One of the major challenges to developing matter-antimatter engines is finding a way to store antimatter after it is produced. B) Matter-antimatter engines would be great in theory, but to date we have no evidence that antimatter even exists. C) Matter-antimatter reactions represent the most efficient possible reactions in terms of energy release. D) Spacecraft powered by matter-antimatter engines could probably reach speeds of more than half the speed of light.
Process of Science: If there is a particularly cold winter in Minnesota one year, does this mean that global warming is wrong, or has ended?
What will be an ideal response?