A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket
a. 0.40 kg/s
b. 0.50 kg/s
c. 0.60 kg/s
d. 0.70 kg/s
e. 0.80 kg/s
a
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A. 20 cm B. 40 cm C. 16 cm D. 25 cm E. 47 cm
A ball rests in the middle of a cart. When you quickly jerk the cart forward, the ball
A) hits the front of the cart. B) hits the back of the cart. C) remains in the middle of the cart. D) all, depending on how quickly the cart is pulled
Fusion of hydrogen nuclei is the origin of solar energy
a. True b. False Indicate whether the statement is true or false
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0