Radio telescope to know about:
What will be an ideal response?
Alma
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This graph shows the frequency of impacts on Earth by objects of various sizes. According to this graph, objects large enough to cause a mass extinction hit Earth
A) about once every 50 million years. B) about once every 1,000 years. C) about once in Earth's history. D) about once every 500 million years.
Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 s. How much power does the elevator use?
A) 20 W B) 50 W C) 100 W D) 1000 W E) 20,000 W
Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the focal length of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?
A) +36.4 cm B) -36.4 cm C) -21.2 cm D) +21.2 cm E) +32.5 cm
Collisions in Two Dimensions: Two vehicles approach a right angle intersection and then suddenly collide. After the collision, they become entangled. If their mass ratios were 1:4 and their respective speeds as they approached the intersection were both 13 m/s, find the magnitude and direction of the final velocity of the wreck.
A. 11 m/s at 14° with respect to the original direction of the lighter car B. 16 m/s at 76° with respect to the original direction of the lighter car C. 11 m/s at 76° with respect to the original direction of the lighter car D. 26 m/s at 76° with respect to the original direction of the lighter car E. 16 m/s at 14° with respect to the original direction of the lighter car