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PhysicsQ&A Library2. Aunt Matilda goes to a well and throws a penny straight down the well at 4.0 m/s. She hears a splash after 0.4 seconds. How deep is the well? a) 1.6 m b) 2.4 m c) 2.8 m d) 3.2 m e) 5.2 m 3. A car starts from 0 m along a road and accelerates at 3 m/s2 to the right. A second car starts from 1000 m along the road and accelerates at 5 m/s2 to the left. Both cars started from rest. How long after they start do the cars meet? a) 16 s b) 17 s c) 18 s d) 19 s e) 20 s 4. A plane is coming in to land on a carrier deck. If it lands at 50 m/s and decelerates at a constant acceleration of -20 m/s2, then what is the minimum length of the carrier deck? a) 50.0 m b) 62.5 m c)75.0 m d) 81.8 m e) 93.7 m 31+bj 5. Given the vectors A a) 1k 11+ 3j. what is A XB? e) 12 and B b) 5k d) 8k 6. A planet has an escape velocity of 15 km/s and a radius of 5x106 m. What is the mass of this planet? a) 6.1x1024 kg b)7.4x1024 kg c) 84x1024 kg d) 8.8x1024 kg e) 1.01x1025 7. A chunk of ice floats in a glass of drinking water. What fraction of the ice is above the waterline? a)12% b) 10% c)8% d) 6% e)4%Start your trial now! First week only $4.99!*arrow_forward*

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