What is the minimum energy needed to lift a 1.0-kg rocket to a height of 200 km and to give it a speed of 8.0 km/s at that height? (Neglect air resistance and the small decrease in g over that distance.)
A) 34 kJ B) 34 MJ C) 34 J D) 34 TJ E) 34 GJ
B
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Parallel-Plate Capacitor: Which of the following will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)
A. a decrease in the plate area and an increase in the plate separation B. a decrease in the potential difference between the plates C. an increase in the potential difference between the plates D. an increase in the plate area and a decrease in the plate separation E. an increase in the charge on the plates
A toy rocket, launched from the ground, rises vertically with an acceleration of 20 m/s2 for 6.0 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve?
A. 1.1 km B. 0.73 km C. 1.9 km D. 0.39 km E. 1.5 km
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A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will
A) be behind the bomb. B) be over the bomb. C) be in front of the bomb. D) depend of the speed of the plane when the bomb was released. E) depend of the mass of the bomb when it was released.