If R = 3.0 k?, C = 6.0 nF, ? 1 = 10.0 V, Q = 18 nC, ? 2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb ? Va?





a.

?13 V



b.

+28 V



c.

+13 V



d.

?28 V



e.

+2.0 V


d

Physics & Space Science

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The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg



a.
6.0 N

b.
5.1 N

c.
5.5 N

d.
4.6 N

e.
3.7 N

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A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences an acceleration a = 3 × 104 m/s2. What is the minimum magnetic field that would produce such an acceleration?

A) 0.1 T B) 0.004 T C) 0.001 T D) 0.01 T E) 0.04 T

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What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

What will be an ideal response?

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