Slanting Surfaces Without Friction: A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A. 200 N
B. 120 N
C. 160 N
D. 150 N
E. 0 N
Answer: C
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The "Cambrian explosion" refers to the
A) great many meteorite bombardments that occurred during that time. B) great diversity of life that blossomed during that time. C) evolution and great diversity of blastoids during that time period. D) numerous volcanic eruptions that took place during that time.
Two long parallel wires lie in the xz plane. One wire passes through the point (?2 m, 0, 0) and the other through the point (+2 m, 0, 0). The wires carry equal currents in the positive z direction. 1.The magnetic field at (?3 m, 0, 0) is in the negative y direction.2.The magnetic field at (?1 m, 0, 0) is in the positive y direction.3.The magnetic field at (+1 m, 0, 0) is in the positive y direction.4.The magnetic field at (+3 m, 0, 0) is in the negative y direction.
A. 1 and 2 are correct. B. 1 and 4 are correct. C. 2 and 3 are correct. D. 3 and 4 are correct. E. None of the above are correct.
If two benzene rings are linked by an oxygen atom it is an _________linkage.
Fill in the blank(s) with the appropriate word(s).
What are the small bits of rock and metal that collide with Earth's atmosphere?
a. meteors b. comets c. asteroids d. meteorites e. meteoroids