Questions from Modern Physics


Q: Two point charges are located on the y-axis as follows

Two point charges are located on the y-axis as follows: charge q1 = -1.50 nC at y = -0.600 m, and charge q2 = +3.20 nC at the origin (y = 0). What is the total force (magnitude and direction) exerted...

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Q: Two point charges are placed on the x-axis as follows

Two point charges are placed on the x-axis as follows: Charge q1 = +4.00 nC is located at x = 0.200 m, and charge q2 = +5.00 nC is at x = -0.300 m. What are the magnitude and direction of the total fo...

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Q: The two sides of the DNA double helix are connected by pairs

The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytos...

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Q: Refer to Exercise 21.21. Figure E21.22 shows

Refer to Exercise 21.21. Figure E21.22 shows the bonding of cytosine and guanine. The O—H and H—N distances are each 0.110 nm. In this case, assume that the bonding...

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Q: What similarities do electric forces have with gravitational forces? What are

What similarities do electric forces have with gravitational forces? What are the most significant differences?

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Q: A proton is placed in a uniform electric field of 2.

A proton is placed in a uniform electric field of 2.75 × 103 N/C. Calculate (a). the magnitude of the electric force felt by the proton; (b). the proton’s acceleration; (c). the proton’s speed afte...

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Q: A proton is traveling horizontally to the right at 4.50

A proton is traveling horizontally to the right at 4.50 × 106 m/s. (a). Find the magnitude and direction of the weakest electric field that can bring the proton uniformly to rest over a distance of 3...

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Q: An electron is released from rest in a uniform electric field.

An electron is released from rest in a uniform electric field. The electron accelerates vertically upward, traveling 4.50 m in the first 3.00 µs after it is released. (a). What are the magnitude and...

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Q: (a). What must the charge (sign and magnitude)

(a). What must the charge (sign and magnitude) of a 1.45-g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 650 N/C? (b). What is the magnitude o...

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Q: The earth has a net electric charge that causes a field at

The earth has a net electric charge that causes a field at points near its surface equal to 150 N/C and directed in toward the center of the earth. (a). What magnitude and sign of charge would a 60-k...

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