What are the primary reasons for making telescopes larger?
a. to make things look bigger
b. to decrease image resolution
c. to collect more light to so faint objects can be seen
d. to see a larger part of the sky
Ans: c. to collect more light to so faint objects can be seen
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A certain automobile engine takes in 4.00 kJ of energy and performs 1.10 kJ of mechanical work in each cycle. (a) Calculate the engine's efficiency. (b) How much thermal energy is "wasted" in each cycle?
What will be an ideal response?
Climate models support the claim that human activity is causing the currently observed global warming because
A) the models can perfectly predict all aspects of today's climate. B) climate models that include contributions by human activity agree much better with actual data than models that consider only natural factors. C) the models are very sophisticated, with thousands of equations, and this gives scientists confidence that the models must be correct. D) the models predict that warming will continue in the future.
Show that in the limit ?x ? 0, the difference equation for one-dimensional steady conduction with heat generation,is equivalent to the differential equation.
GIVEN • One dimensional steady conduction with heat generation SHOW (a) In the limit of small ?x, the difference equation is equivalent to the differential equation
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south