This photo shows the famous Crab Nebula. What is it?
A) an expanding cloud of remains from a star that died in a supernova
B) a classic example of a planetary nebula
C) a star that is right now undergoing a supernova explosion
D) a star forming cloud that will eventually give birth to hundreds of stars
A) an expanding cloud of remains from a star that died in a supernova
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By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
a. straight lines in space that go from one magnetic charge to another. b. straight lines in space that are parallel to the wire. c. straight lines in space that are perpendicular to the wire. d. circles that have their centers on the wire and lie in planes perpendicular to the wire. e. circles that have the wire lying along a diameter of the circle.
If a net force is applied to an object, what is guaranteed to change?
A) the object's momentum B) the object's speed C) the object's direction of motion D) the object's mass E) the object's weight
A 5 500-N weight is held suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, T1 . Cable 2 applies a force upward and to the left at an angle of 40.0° to the negative x-axis and has a tension, T2 . What is the tension, T1?
a. 4.6E+3 N b. 6.6E+3 N c. 4.2E+3 N d. 8.6E+3 N e. 1.1E+4 N
When something is thrown over large distances (on Earth), what new factor comes into play?
a. The curvature of the Earth. b. The increase in gravity over long distances. c. The decrease in gravity over long distances. d. The tendency of thrown objects to fall to the ground. e. The difference between miles and kilometers.