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4 May 2023
17. Two springs attached to a block that can slide on a frictionless surface. In the equilibrium position, the left spring is compressed by 2 cm.
a) by how much is the right spring compressed?
b) What is the net force on the block if it is moved 15 cm to the right of its equilibrium position?
18. A police siren has a frequency of 550 Hz as it approaches you, and 450 Hz after it has passed you and is moving away. How fast are the police traveling?
17. Two springs attached to a block that can slide on a frictionless surface. In the equilibrium position, the left spring is compressed by 2 cm.
a) by how much is the right spring compressed?
b) What is the net force on the block if it is moved 15 cm to the right of its equilibrium position?
18. A police siren has a frequency of 550 Hz as it approaches you, and 450 Hz after it has passed you and is moving away. How fast are the police traveling?
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