CH8_studyguide - Midterm3_study_guide_Ch8 2 As a particle...

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137 Midterm3_study_guide_Ch8 2. As a particle moves along the x axis it is acted upon by a single conservative force given by F x = (20 – 4.0 x ) N where x is in m. The potential energy associated with this force has the value +30 J at the origin ( x = 0). What is the value of the potential energy at x = 4.0 m? a. –48 J b. +78 J c. –18 J d. +48 J e. +80 J 8. A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 1.5 m. The maximum angle the string makes with the vertical as the pendulum swings is 30°. What is the speed of the object at the lowest point in its trajectory? a. 2.0 m/s b. 2.2 m/s c. 2.5 m/s d. 2.7 m/s e. 3.1 m/s 14. A 1.2-kg mass is projected from ground level with a velocity of 30 m/s at some unknown angle above the horizontal. A short time after being projected, the mass barely clears a 16-m tall fence. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass as it clears the fence? a.
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This note was uploaded on 05/06/2008 for the course PHYS 195 taught by Professor Anderson during the Spring '07 term at San Diego State.

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CH8_studyguide - Midterm3_study_guide_Ch8 2 As a particle...

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