A 5.0-m long, 12-kg, ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A)
4.0 m
B)
3.7 m
C)
1.7 m
D)
1.3 m
E)
3.3 m
C
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Which of the following is true of the Sun?
A) It is a self-luminous body of hot gas. B) It is the first planet of the Solar System. C) It shines by reflecting light from the Moon. D) It is the biggest star in the Universe.
The arrows in this diagram are meant to show how gravitational equilibrium works in the Sun. What do the different colors and different arrow lengths represent?
A) inward pointing green arrows represent gravity outward pointing red arrows represent pressure longer arrows represent a stronger push or pull B) inward pointing green arrows represent gravity outward pointing red arrows represent the solar wind longer arrows represent a stronger push or pull C) inward pointing green arrows represent conduction outward pointing red arrows represent radiation longer arrows represent greater intensity D) inward pointing green arrows represent downward convection outward pointing red arrows represent upward convection longer arrows represent stronger convection
Our Sun, along with most of the stars in our neighborhood, probably formed:
A) a few million years ago. B) about 10 million years ago. C) hundreds of millions of years ago. D) billions of years ago. E) at the beginning of the universe.
The work done in moving a positive charge against an electric field does not depend on the path chosen in moving the charge in that field. Based on the statement, what kind of force field is the electrostatic field?
A) discrete B) quantized C) polarized D) conservative E) nonconservative