A simplified explanation of mountain building is provided by the theory of
a. orogenesis.
b. plate tectonics.
c. continental accretion.
d. epiorogenic movement.
b
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Cosmology is the study of the structure, history, and evolution of the observable Universe
a. True b. False Indicate whether the statement is true or false
Force on a Moving Charge: A positive charge is moving to the right and experiences an upward magnetic force, as shown in the figure. In which direction must the magnetic field have a component?
A. to the right B. to the left C. upward D. out of the page E. into the page
Bumpers on cars are not of much use in a collision
To see why, calculate the average force a bumper would have to exert if it brought a 1200-kg car (a so-called compact model) to a rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph). (Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal.) A) 1.8 × 104 N B) 1.6 × 104 N C) 5.4 × 104 N D) 6.5 × 105 N E) 3.2 × 104 N
Which of these is NOT a consequence of dust in the interstellar medium?
A) reddening of stars' light that passes through the dust B) blue reflection nebulae around the Pleiades C) red light from the emission nebulae D) the dark nebulae that block 90% of the Milky Way from us visually E) terrestrial planets like our own