23. If a plane electromagnetic wave traveling in the x-direction has ∂E/∂x = –kE_max sin(kx – ωt), we can deduce that ∂B/∂t is equal to ______. (A) kB_max sin(kx – ωt) (B) cB_max sin(kx – ωt) (C) ωB_max sin(kx – ωt) (D) ωcB_max sin(kx – ωt) (E) (ωB_max/c) sin(kx – ωt)

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.

相關試題

相關試卷