A horizontal force of 100 N is applied to move a 45-kg cart across a 5.0-m level surface. What work is done by the 100-N force?
a. 405 J
b. 500 J
c. 900 J
d. 4500 J
B
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A compound microscope is made with an objective lens ( = 0.90 cm) and an eyepiece ( = 1.1 cm). The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image of the eyepiece be located?
a. ?30 b. ?15 c. ?23 d. ?11 e. ?9
The larger variation in brightness in an eclipsing system consisting of a white dwarf and an M3 main-sequence star occurs when the white dwarf passes behind the M3 star
a. True b. False Indicate whether the statement is true or false
In order to understand what the universe was like before 10-44 seconds we need
A) a way to measure more distant Type Ia supernovae B) to understand how helium can be made from hydrogen in stars C) to develop Quantum Field Theory D) to harness the power of black holes E) a way to combine the theories of General Relativity and Quantum Mechanics
If a force acts on an object, the impulse will be
A. zero if the speed of the object does not change. B. nonzero in all situations. C. zero if the force is applied perpendicular to the momentum object. D. zero if the force is in the opposite direction of the velocity of the object.