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27 Nov 2019
A pendulum consists of a 1.7-kg bob attached to a light 2.3-m-longstring. While hanging at rest with the string vertical, the bob isstruck a sharp horizontal blow, giving it a horizontal velocity of4.6 m/s. At the instant the string makes an angle of 30° with thevertical, calculate the following:
(a) the speed
m/s
(b) the gravitational potential energy (relative to its value is atthe lowest point)
J
(c) the tension in the string?
N
(d) What is the angle of the string with the vertical when the bobreaches its greatest height?
°
A pendulum consists of a 1.7-kg bob attached to a light 2.3-m-longstring. While hanging at rest with the string vertical, the bob isstruck a sharp horizontal blow, giving it a horizontal velocity of4.6 m/s. At the instant the string makes an angle of 30° with thevertical, calculate the following:
(a) the speed
m/s
(b) the gravitational potential energy (relative to its value is atthe lowest point)
J
(c) the tension in the string?
N
(d) What is the angle of the string with the vertical when the bobreaches its greatest height?
°
Bunny GreenfelderLv2
13 Jul 2019
