A huge cannon is assembled on an airless planet having insignificant axial spin. The planet has a radius of 5.00 × 106 m and a mass of 3.95 × 1023 kg
The cannon fires a projectile straight up at 2000 m/s. An observation satellite orbits the planet at a height of 1000 km. What is the projectile's speed as it passes the satellite? (G = 6.67 × 10-11 N ? m2/kg2)
A) 1500 m/s
B) 1380 m/s
C) 1610 m/s
D) 1280 m/s
Answer: A
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A. 6.3 × 1018 B. 6.3 × 109 C. 1.6 × 1019 D. 1.6 × 109 E. 6.0 × 1023
A 2.5-kg box, sliding on a rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring (see the figure)
The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until is comes to a momentary halt, is -0.50 J. (a) What is the spring constant of the spring? (b) What is the coefficient of kinetic friction between the box and the rough surface? What will be an ideal response?
A quantity that is a measure of how the distance traveled changes with time is
A. acceleration. B. velocity. C. force. D. speed. E. momentum.
A parallel-plate capacitor has a capacitance of 10 mF and charged with a 20-V power supply
The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates. How much energy is now stored by the capacitor? A) 500 mJ B) 1200 mJ C) 125 mJ D) 62.5 mJ E) 250 mJ