Our Solar System:
is centrally positioned in the Milky Way galaxy.
formed 10 billion years ago.
has a massive, first-generation star at its center.
completes one rotation around the center of the Milky Way every 250 million years.
All of the above are true.
completes one rotation around the center of the Milky Way every 250 million years.
(Our Solar System lies near the outer edge of the Milky Way, it formed less than 5 billion years ago, and our Sun is a third- or fourth-generation star.)
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Explain how solar wind interacts with Earth's magnetic field to create auroras at the poles. Make sure to include each part of the magnetic field the solar particles interact with
What will be an ideal response?
The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days
The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 x 10-27 kg) (a) What mass of 234Th was initially present? (b) What is the decay rate after 68 days?
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of -1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
A. 42 N/C B. 84 N/C C. 34 N/C D. 68 N/C E. 0
A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?