A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force required to keep the car from sliding?
A) 9000 N
B) 9810 N
C) 300 N
D) 900 N
E) 3000 N
A
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What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A) The orbits of stars in the center of the galaxy indicate that the presence of an approximately 4 million solar-mass object in a region no larger than our solar system. B) Huge amounts of x-rays are pouring out of the center of the galaxy. C) The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole. D) We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole.
On Venus,__________are large round geological faults in the crust caused by the intrusion of magma below the crust
A) multiringed basins B) micrometeorites C) magma oceans D) coronae
Elementary Particles: The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A. uud B. ddu C. udd D. ttb E. bst
What is the amplitude (in meters) of a wave whose displacement is given by y = 50. sin(0.20x + 120t) cm?
A) 0.50 m B) 1.0 m C) 6 m D) 0.20 m E) 10 m