A solid object is made of two materials, one material having density of 2 500 kg/m3 and the other having density of 6 500 kg/m3 . If the object contains equal masses of the materials, what is its average density?
a. 3 611 kg/m3
b. 4 500 kg/m3
c. 4 611 kg/m3
d. 9 000 kg/m3
e. more information is needed
a
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The force of electrostatic attraction increases when which of the following are brought closer together?
a. Two negatively charged objects b. Two positively charged objects c. Two neutral objects d. One positively charged object and one negatively charged object
When is the angular momentum of a system constant?
A) Only when its total kinetic energy is constant. B) Only when the linear momentum and the energy are constant. C) Only when no net external torque is exerted on the system. D) Only when the moment of inertia is constant.
The most important conclusion to be drawn from the Michelson-Morley experiment is that
A. the speed of light is influenced by the direction of motion. B. the Earth is not an inertial reference frame. C. the Earth's orbital speed around the Sun is constant. D. light does not travel through a luminiferous ether.
Millisecond pulsars _____
a. are created in supernova explosions of the most massive stars b. result from the collision of two neutron stars c. represent the youngest pulsars detected d. result from long-term mass transfer from a companion star e. are a theoretical prediction that has not been observed