A ball is thrown straight up with enough speed so that it is in the air for several seconds. (a) What is the velocity of the ball when it reaches its highest point? (b) What is its velocity 1 s before it reaches its highest point? (c) What is the charge in its velocity, Δ v , during this 1-s interval? (d) What is its velocity 1 s after it reaches its highest point? (e) What is the change in its velocity, Δ v , during this 1-s interval? (f) What is the change in its velocity, Δ v , during the 2-s interval from 1 s before it reaches the highest point to 1 s after it reaches the highest point? ( Caution : We are talking about velocity, not speed.) (g) What is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity?
A ball is thrown straight up with enough speed so that it is in the air for several seconds. (a) What is the velocity of the ball when it reaches its highest point? (b) What is its velocity 1 s before it reaches its highest point? (c) What is the charge in its velocity, Δ v , during this 1-s interval? (d) What is its velocity 1 s after it reaches its highest point? (e) What is the change in its velocity, Δ v , during this 1-s interval? (f) What is the change in its velocity, Δ v , during the 2-s interval from 1 s before it reaches the highest point to 1 s after it reaches the highest point? ( Caution : We are talking about velocity, not speed.) (g) What is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity?
A ball is thrown straight up with enough speed so that it is in the air for several seconds.
(a) What is the velocity of the ball when it reaches its highest point?
(b) What is its velocity 1 s before it reaches its highest point?
(c) What is the charge in its velocity, Δv, during this 1-s interval?
(d) What is its velocity 1 s after it reaches its highest point?
(e) What is the change in its velocity, Δv, during this 1-s interval?
(f) What is the change in its velocity, Δv, during the 2-s interval from 1 s before it reaches the highest point to 1 s after it reaches the highest point? (Caution: We are talking about velocity, not speed.)
(g) What is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity?
The force of the quadriceps (Fq) and force of the patellar tendon (Fp) is identical (i.e., 1000 N each). In the figure below angle in blue is Θ and the in green is half Θ (i.e., Θ/2). A) Calculate the patellar reaction force (i.e., R resultant vector is the sum of the horizontal component of the quadriceps and patellar tendon force) at the following joint angles: you need to provide a diagram showing the vector and its components for each part. a1) Θ = 160 degrees, a2) Θ = 90 degrees. NOTE: USE ONLY TRIGNOMETRIC FUNCTIONS (SIN/TAN/COS, NO LAW OF COSINES, NO COMPLICATED ALGEBRAIC EQUATIONS OR ANYTHING ELSE, ETC. Question A has 2 parts!
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