<p>4. Over a certain region of space, the electric potential is V = 5x &ndash; 3x&sup2;y + 2yz&sup2;. What is the magnitude of the field at the point P that has coordinates (1, 0, &ndash;2) m? (A) 38 N/C (B) 42 N/C (C) 23 N/C (D) 17 N/C (E) 7 N/C</p>

2. The first stage of a Saturn V space vehicle consumes fuel and oxidizer at the rate of 1.50 × 10⁴ kg/s, with an exhaust speed of 2.60 × 10³ m/s. What is the acceleration of the vehicle just as it vertically lifts off the launch pad on the Earth if the vehicle's initial mass is 3.00 × 10⁶ kg? (A) 7.40 m/s² (B) 5.37 m/s² (C) 3.20 m/s² (D) 1.48 m/s² (E) None of the above is correct.

4. Over a certain region of space, the electric potential is V = 5x – 3x²y + 2yz². What is the magnitude of the field at the point P that has coordinates (1, 0, –2) m?
(A) 38 N/C
(B) 42 N/C
(C) 23 N/C
(D) 17 N/C
(E) 7 N/C

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