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220Midterm1

# 220Midterm1 - 220/spring2009 GiambattistaM/GB02P002-mc.pr...

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Unformatted text preview: 220/spring2009 GiambattistaM/GB02P002-mc.pr for user cui PHYS220 Midterm I (Last updated: Wed Jul 7 15:01:27 2004) Spring constant Don't Forget to Give Answers in Specifed Units ! If you have a Fgure in the present problem do not use the numbers shown in the Fgures. Please use the numbers given in the text of the problem unless you are asked to use the numbers from the Fgure! If a force of 5.0 N causes a spring to stretch 3.5 cm from its relaxed length, how far does a force of 7.0 N cause the same spring to stretch? What is the spring constant of this spring? 4.9 cm; 1.4 N/cm 1. 6.0 cm; 2.2 N/cm 2. 4.5 cm; 2.0 N/cm 3. 4.0 cm; 1.1 N/cm 4. ____________________ [weight: 1] 1 OK Maximum number of attempts for credit = 2 cui 220/spring2009 Homework Problem Listing https://chip.physics.purdue.edu/cgi-bin/220/spring2009/Instruct... 1 of 12 2/3/09 1:33 PM 220/spring2009 GiambattistaM/GB02P035-mc.pr for user cui PHYS220 Midterm I (Last updated: Mon Jul 12 11:17:34 2004) Pushing a block on the foor Don't Forget to Give Answers in SpeciFed Units ! If you have a Fgure in the present problem do not use the numbers shown in the Fgures. Please use the numbers given in the text of the problem unless you are asked to use the numbers from the Fgure! A 3.0-kg block is at rest on a horizontal ¡oor. If you push horizontally on the 3.0-kg block with a force of 12.0 N, it just starts to move. (a) What is the coef¢cient of static friction? (b) A 7.0-kg block is stacked on top of the 3.0-kg block. What is the magnitude F of the force, acting horizontally on the 3.0-kg block as before, that is required to make the two blocks start to move? (a) 0.41 ; (b) 40 N 1. (a) 0.41 ; (b) 98 N 2. (a) 0.37; (b) 68 N 3. (a) 0.25; (b) 98 N 4. (a) 0.37; (b) 40 N 5. ____________________ [weight: 1] 1 OK Maximum number of attempts for credit = 2 cui 220/spring2009 Homework Problem Listing https://chip.physics.purdue.edu/cgi-bin/220/spring2009/Instruct... 2 of 12 220/spring2009 GiambattistaM/GB02P035-mc.pr for user cui PHYS220 Midterm I (Last updated: Mon Jul 12 11:17:34 2004) Pushing a block on the foor Don't Forget to Give Answers in SpeciFed Units ! If you have a Fgure in the present problem do not use the numbers shown in the Fgures. Please use the numbers given in the text of the problem unless you are asked to use the numbers from the Fgure! A 3.0-kg block is at rest on a horizontal ¡oor. If you push horizontally on the 3.0-kg block with a force of 12.0 N, it just starts to move. (a) What is the coef¢cient of static friction? (b) A 7.0-kg block is stacked on top of the 3.0-kg block. What is the magnitude F of the force, acting horizontally on the 3.0-kg block as before, that is required to make the two blocks start to move?...
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220Midterm1 - 220/spring2009 GiambattistaM/GB02P002-mc.pr...

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