An object is moving in a circular path of radius 4.00 m. If the object moves through an angle of 30.0 degrees, then the tangential distance traveled by the object is
A. 3.66 m.
B. 3.21 m.
C. 2.84 m.
D. 2.09 m.
E. 1.75 m.
D. 2.09 m.
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Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about Jupiter would be
A) less than 8 km/s. B) greater than 8 km/s. C) about 8 km/s.
In the operation of a steam-electric generating plant, the work output [from thermal energy to work] occurs
A) at the point where the fossil or other fuel is shipped into the plant area. B) in the condenser. C) at the point where the energy from the furnace is transferred into the boiler. D) at the point where the hot steam pushes against the turbine. E) in the electric generators.
Solenoid ?1 has a length L, cross-sectional area A, and N turns. Solenoid ?2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them?
a. ?1 b. ?2 c. Both have the same magnetic field. d. Since it depends on the values of A and L, none of the above are correct.
To find the distance of nearby stars, we use their parallaxes obtained over ________-month intervals
A) one B) three C) six D) twelve E) twenty-four