A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is the average tangential acceleration of a point on the wheel's edge?
a. 0.45 m/s2
c. 28 m/s2
b. 0.60 m/s2
d. 14 m/s2
B
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The jovian planets in our solar system are
A) Jupiter, Saturn, Uranus, and Neptune. B) Mercury, Venus, Earth, and Mars. C) Pluto and Eris. D) Io, Europa, Ganymede, and Callisto.
A satellite is placed in a geosynchronous orbit. In this equatorial orbit with a period of 24 hours, the satellite hovers over one point on the equator. Which statement is true for a satellite in such an orbit?
a. There is no gravitational force on the satellite. b. There is no acceleration toward the center of the Earth. c. The satellite is in a state of free fall toward the Earth. d. There is a tangential force that helps the satellite keep up with the rotation of the Earth. e. The force toward the center of the Earth is balanced by a force away from the center of the Earth.
What is the first law of thermodynamics?
a. The increase in the internal energy of a system is equal to the heat added plus the work done on the system. b. Heating a system makes it more disordered. c. The increase in the internal energy of a system is equal to the heat added times the work done on the system. d. The increase in the internal energy of a system is equal to the work done on the system. e. Objects in motion tend to remain in motion; objects at rest tend to remain at rest.
Hydrostatic equilibrium is the balance between ________ of a star and ________.
A. the size; energy production B. the internal pressure; gravity C. hydrogen fusion; temperature D. the internal pressure; energy production