A force F is applied on a block that is sliding along a frictional surface with a kinetic friction force f. Due to the applied force F, the block is sliding with acceleration value a. Which one of the following is not an example of contact force? (a) Normal force on the block, N (b) The applied force F and the Normal Force N (c) kinetic friction force f (d) Both applied force F & weight of the block mgj

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter5: More Applications Of Newton’s Laws
Section: Chapter Questions
Problem 9P: A 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00 m down...
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Solve this 2 mcq question please. choose the answer only.
A force F is applied on a block that is sliding along a frictional surface with a kinetic friction
force f. Due to the applied force F, the block is sliding with acceleration value a.
Which one of the following is not an example of contact force?
(a) Normal force on the block, N
(b) The applied force F and the Normal Force N
(c) kinetic friction force f
(d) Both applied force F & weight of the block mgi
Transcribed Image Text:A force F is applied on a block that is sliding along a frictional surface with a kinetic friction force f. Due to the applied force F, the block is sliding with acceleration value a. Which one of the following is not an example of contact force? (a) Normal force on the block, N (b) The applied force F and the Normal Force N (c) kinetic friction force f (d) Both applied force F & weight of the block mgi
In a specific ballet move called pirouette, the ballerina spins on her toes. She can control the
speed of the spin by adjusting the position of her arms and legs.
[Note: you can consider model the ballerina with her arms and legs tucked in a uniform cylinder
of mass 55 kg and radius 13 cm.] You can understand the axis of rotation of her spin, right?
Let's consider for the last t = 15 sec, she is spinning with a constant angular speed
o = 1/3 rad/s. Which of the following is true regarding the tangential acceleration of her spin?
(a) Tangential acceleration is zero for the time being,
(b) You can't find the tangential acceleration with the given information.
(c) Tangential acceleration is not zero but insufficient information is given.
(d) Tangential acceleration a, = 137/6 m/s²
Transcribed Image Text:In a specific ballet move called pirouette, the ballerina spins on her toes. She can control the speed of the spin by adjusting the position of her arms and legs. [Note: you can consider model the ballerina with her arms and legs tucked in a uniform cylinder of mass 55 kg and radius 13 cm.] You can understand the axis of rotation of her spin, right? Let's consider for the last t = 15 sec, she is spinning with a constant angular speed o = 1/3 rad/s. Which of the following is true regarding the tangential acceleration of her spin? (a) Tangential acceleration is zero for the time being, (b) You can't find the tangential acceleration with the given information. (c) Tangential acceleration is not zero but insufficient information is given. (d) Tangential acceleration a, = 137/6 m/s²
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