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3.1 During a flood a tree trunk of mass 100 kg falls down a waterfall. The waterfall is 5 m high. m = 100 kg waterfall 5 m If air resistance is ignored, calculate: 3.1.1 the potential energy of the tree trunk at the top of the waterfall. 3.1.2 the kinetic energy of the tree trunk at the bottom of the waterfall. 3.1.3 the magnitude of the velocity of the tree trunk at the bottom of the waterfall. 3.2 A concave lens has focal length of 20 cm. A 5 cm tall object be placed so that it foms an image at 15 cm from the lens. 3.2.1 Calculate at what distance from the lens must the object be placed. 3.2.2 Calculate the size of the image formed.

3.1 During a flood a tree trunk of mass 100 kg falls down a waterfall. The waterfall is 5 m high. m = 100 kg waterfall 5 m If air resistance is ignored, calculate: 3.1.1 the potential energy of the tree trunk at the top of the waterfall. 3.1.2 the kinetic energy of the tree trunk at the bottom of the waterfall. 3.1.3 the magnitude of the velocity of the tree trunk at the bottom of the waterfall. 3.2 A concave lens has focal length of 20 cm. A 5 cm tall object be placed so that it foms an image at 15 cm from the lens. 3.2.1 Calculate at what distance from the lens must the object be placed. 3.2.2 Calculate the size of the image formed.

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3.1 During a flood a tree trunk of mass 100 kg falls down a waterfall. The waterfall is 5 m high. m = 100 kg waterfall 5 m If air resistance is ignored, calculate: 3.1.1 the potential energy of the tree trunk at the top of the waterfall. 3.1.2 the kinetic energy of the tree trunk at the bottom of the waterfall. 3.1.3 the magnitude of the velocity of the tree trunk at the bottom of the waterfall. 3.2 A concave lens has focal length of 20 cm. A 5 cm tall object be placed so that it foms an image at 15 cm from the lens. 3.2.1 Calculate at what distance from the lens must the object be placed. 3.2.2 Calculate the size of the image formed.
Transcribed Image Text:3.1 During a flood a tree trunk of mass 100 kg falls down a waterfall. The waterfall is 5 m high. m = 100 kg waterfall 5 m If air resistance is ignored, calculate: 3.1.1 the potential energy of the tree trunk at the top of the waterfall. 3.1.2 the kinetic energy of the tree trunk at the bottom of the waterfall. 3.1.3 the magnitude of the velocity of the tree trunk at the bottom of the waterfall. 3.2 A concave lens has focal length of 20 cm. A 5 cm tall object be placed so that it foms an image at 15 cm from the lens. 3.2.1 Calculate at what distance from the lens must the object be placed. 3.2.2 Calculate the size of the image formed.
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