One philosophical difference between Newtonian and modern physics is that, unlike modern physics, Newtonian physics
A) assumes that the universe is made of separate and independently existing parts.
B) makes predictions that contain an essential element of uncertainty.
C) is based on abstract concepts and is thus difficult or impossible to picture.
D) emphasizes the interaction between the observer and the thing observed.
E) has no way of dealing with energy and other abstract concepts.
A
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Astronomers refer to elements heavier than helium as _______________
Fill in the blank(s) with correct word
The separation of forces in the grand unified theory occurs after inflation
a. True b. False Indicate whether the statement is true or false
Consider a rock interacting gravitationally with the earth, and choose the interaction’s potential energy to be zero if the rock is at the ground level. A person standing at the bottom of a well throws the rock vertically upward from 20 m below ground level. The rock makes it all the way up to 1 m below ground level before falling back into the well. The total energy of the rock–earth system is
A. negative. B. zero. C. positive (in this particular case). D. positive (because energy is always positive). E. The answer depends on information not specified.
A radiometer has two square vanes (each measuring 1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure
The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. An electromagnetic wave with an intensity of 0.30 kW/m2 is incident normally upon the vanes. What is the electromagnetic power absorbed by the blackened vane? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 0.030 W B) 0.040 W C) 0.050 W D) 0.060 W E) 0.090 W