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Physics 101 Mechanics Q&A Archive of October 29, 2021

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October 29 of 2021

An electric turntable 0.800 m in diameter is rotating about a fixed axis with an initial angular velocity of 0.250 rev/s. The angular acceleration is 0.916 rev/s2. (A) Compute the angular velocity after a time of 0.205 s. (B) Through how many revolutions has the blade turned in this time…
What is the torque about the origin on a particle located at x = 1.5m ,y =-20m, z= 1.6m due to a force (3.5N)i-(2.4N)j+(4.2N)k ? Express the result in unit vector notation.
A helical spring is made by wrapping steel wire 12mm? around forming cylinder 100mm in diameter. Compute the number of turns required to permit an elongation of 80mm without exceeding a shearing stress of 140MPa. G = 83GPa.
Situation 1. Seven-year old female twins of identical mass exhausted themselves in a park slide. Kara consistently played in the 2-meter tall yellow slide while her twin Lara, played on the blue side. Who has done greater work in each slide ride? Why?
Situation 1. Seven-yeae old female twins of identical mass exhausted themselves in a park slide. Kara consistently played in the 2-meter tall yellow slide while her twin Lara, played on the blue side. Who has donw greater work in each slide ride? Why?
A car traveling 88km/h approaches an intersection just as the traffic light turns yellow
A baseball of mass 250 g, pitched with a speed of 40. m/s, is caught by the catcher, whose glove moves backward 0.25 m while stopping the ball. How much work does the glove do on the ball, and what is the average stopping force applied?
A baseball of mass 250 g, pitched with a speed of 40. m/s, is caught by the catcher, whose glove moves backward 0.25 m while stopping the ball. How much work does the glove do on the ball, and what is the average stopping force applied?
Chris and Steve push a huge boulder (m = 65 kg) to the top of an 18 m cliff. The boulder is moving with a speed of 6.0 m/s when it tumbles over the edge of the cliff. How fast will it be going when it hits the ground?
An electric turntable 0.800 m in diameter is rotating about a fixed axis with an initial angular velocity of 0.250 rev/s. The angular acceleration is 0.916 rev/s2. (A) Compute the angular velocity after a time of 0.205 s. (B) Through how many revolutions has the blade turned in this time…
What is the torque about the origin on a particle located at x = 1.5m ,y =-20m, z= 1.6m due to a force (3.5N)i-(2.4N)j+(4.2N)k ? Express the result in unit vector notation.
A helical spring is made by wrapping steel wire 12mm? around forming cylinder 100mm in diameter. Compute the number of turns required to permit an elongation of 80mm without exceeding a shearing stress of 140MPa. G = 83GPa.
Situation 1. Seven-yeae old female twins of identical mass exhausted themselves in a park slide. Kara consistently played in the 2-meter tall yellow slide while her twin Lara, played on the blue side. Who has donw greater work in each slide ride? Why?
A car traveling 88km/h approaches an intersection just as the traffic light turns yellow
A baseball of mass 250 g, pitched with a speed of 40. m/s, is caught by the catcher, whose glove moves backward 0.25 m while stopping the ball. How much work does the glove do on the ball, and what is the average stopping force applied?
A baseball of mass 250 g, pitched with a speed of 40. m/s, is caught by the catcher, whose glove moves backward 0.25 m while stopping the ball. How much work does the glove do on the ball, and what is the average stopping force applied?
Chris and Steve push a huge boulder (m = 65 kg) to the top of an 18 m cliff. The boulder is moving with a speed of 6.0 m/s when it tumbles over the edge of the cliff. How fast will it be going when it hits the ground?