A baseball is thrown straight up with initial speed v0. If air resistance cannot be ignored, when the ball returns to its initial height its speed is less than v0. Explain why, using energy concepts.
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A baseball is thrown straight up with initial speed v0. If air resistance cannot be ignored, when the ball returns to its initial height its speed is less than v0. Explain why, using energy concepts.
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- A daredevil on a motorcycle leaves the end of a ramp with a speed of 39.6 m/s as in the figure below. If his speed is 37.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.A horizontal spring is stretched 10 cm and then released from rest. Will the spring ever stretch a distance greater than 10 cm? Explain why or why not using the idea of energy conservation.Same set-up for the conservation of energy was performed. The 5-g marble covered a horizontal distance of 40 cm from the edge of the ramp (horizontal) from an elevation of 15 cm above the ground. At what height (in cm) relative to edge of the ramp was the marble released? Use g=9.8 m/s2. Round off your answer to two decimal places.
- Scenario: Some Marines are lowering a 170 kg sled loaded with ammunition down a hill, when the rope breaks and the sled begins sliding uncontrolled. Beginning with a speed of 1.9 m/s, the sled loses 4.3 meters of elevation before coming to a stop. Question: How much thermal energy (in joules) was generated in the sled and the hill during the slide?A roller coaster starts with a speed of 4.1 m/s at a point 51 m above the bottom of a dip. Neglecting friction, what wil be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip? Answer: m/sA man starts at ground level and carries a 20 kg box up a flight of stairs to a height of 3.6 m. He then carries the box down an adjacent flight of stairs back to ground level and ends up 10 m away from where he started. What is the total amount of work the man has done? Explain
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