Which of the following represent the oldest stars of the Milky Way?
A) the Sun and other stars with similar mass
B) O stars
C) red giant stars in spiral arms
D) Cepheid variable stars
E) stars in globular clusters
E) stars in globular clusters
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Electromagnets work by aligning little regions of magnetic field in iron so they mostly point in the same direction. This produces a greatly strengthened magnetic field. This is correct
Electromagnets' domains are aligned by the current in the coil. 17 . If a normal D-cell battery is used in a device, for every 1.0 C of charge that moves through the battery, 1.5 J of work is done on the charge.
If Jupiter were 10 times more massive, it would generate nuclear fusion in its core and be a star instead of a planet
Indicate whether the statement is true or false
Which can be seen by the naked eye?
a. mv = +10 b. mv = +18 c. mv = +6 d. mv = +8
A car, driven around a circle with constant speed, must have
A) zero acceleration. B) a centrifugal acceleration. C) zero velocity. D) a centripetal acceleration. E) a tangential acceleration.