Rotation of the protostar helps generate the magnetic fields and bipolar flows

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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Which of a planet's fundamental properties has the greatest effect on its level of volcanic and tectonic activity?

a. size b. distance from the Sun c. rotation rate

Physics & Space Science

You want to swim straight across a river that is wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of relative to the water

At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is while directly across the river is A) 1.3 m/s B) 0.70 m/s C) 1.6 m/s D) 1.8 m/s

Physics & Space Science

What mass would have to be condensed to a radius of 1.0 × 10-15 m (the order of magnitude of the radius of an atomic nucleus) in order for it to become a black hole? G = 6.67 × 10-11 Nm2/kg2

A) 1.1 × 10-6 kg B) 4.1 × 10-8 kg C) 2.2 × 103 kg D) 6.7 × 1011 kg E) 8.3 × 1015 kg

Physics & Space Science

A mass of 4.5 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 29 N/m and on the left to a horizontal spring with spring constant 60 N/m. If this system is moved from equilibrium, what is the effective spring constant?

a. –31 N/m b. 31 N/m c. 89 N/m d. –89 N/m e. 16 N/m

Physics & Space Science