Does a planetary nebula have anything to do with planets? Explain
What will be an ideal response?
While these nebulae expelled by highly evolved red giants might look like greenish disks in some cases, they have nothing to do with planets.
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Which of the following statements correctly explains why galaxy collisions should have been more common in the past than they are today?
A) Galaxies were closer together in the past, because the universe was smaller. B) Galaxies were more active in the past and therefore would have collided with each other more frequently. C) Galaxies were much bigger in the past, because they had not contracted completely. D) Galaxies attracted each other more strongly in the past, because they had not yet turned most of their mass into stars.
A 1.37-kg block is held in place against the spring by a 74-N horizontal external force (see the figure)
The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring. The block descends a ramp and has a velocity at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.24. The velocity of the block is at C. The block moves on to D, where it stops. The initial compression of the spring is closest to A) 2.7 cm. B) 1.4 cm. C) 0.96 cm. D) 5.3 cm. E) 3.6 cm.
A series combination of a 48.0-?F capacitor and a resistor are connected to a 12-V battery. After one second, the voltage across the capacitor is 10 V. What is the resistance of the resistor?
a. 11.6 k? b. 3.47 k? c. 37.3 k? d. 208 k?
Constant Acceleration Kinematics: A jet plane is launched from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0 s?
A. 16 m B. 24 m C. 42 m D. 84 m