Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 46P
To determine
To Find:The forces acting on the block B.
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1 kg is found
A block of mass m =
on an inclined plane that makes an
angle 30° with the horizontal. The
coefficient of static friction and coef-
ficient of kinetic friction between the
block and the incline are: µs
and uk = 0.5. Take the positive di-
rection to be up the inclined plane
0.6
%3D
130°
With the block initially at rest, the acceleration of the block is
HW
QI) Knowing that the coefficient of friction between the 25-kg block and the incline is µ = 0.25, determine
(a) the smallest value of P required to start the block moving up the incline, (b) the corresponding value of B.
P
25 kg
30°
Q2) The coefficients of friction between the block and the rail are u. = 0.30 and le = 0.25. Knowing that
0=65°, determine the smallest value of P required (a) to start the block moving up the rail, (b) to keep it from
moving down.
35°
500 N
Q3) The coefficients of friction are . = 0.40 and ue = 0.30 between all surfaces of contact. Determine the
smallest force P required to start the 30-kg block moving if cable AB (a) is attached as shown, (b) is removed.
A
20 kg
30 kg
Three forces in the x-y plane act on a 4.40 kg mass: 14.90 N directed at 57o, 8.40 N directed at 168o, and 5.30 N directed at 195o. All angles are measured from the positive x-axis, with positive angles in the Counter-Clockwise direction. Calculate the magnitude of the acceleration.
Calculate the direction of the resultant force using the same sign convention as above (in degrees).
Chapter 4 Solutions
Physics Fundamentals
Ch. 4 - Prob. 1QCh. 4 - Prob. 2QCh. 4 - Prob. 3QCh. 4 - Prob. 4QCh. 4 - Prob. 5QCh. 4 - Prob. 6QCh. 4 - Prob. 7QCh. 4 - Prob. 8QCh. 4 - Prob. 9QCh. 4 - Prob. 10Q
Ch. 4 - Prob. 11QCh. 4 - Prob. 12QCh. 4 - Prob. 13QCh. 4 - Prob. 14QCh. 4 - Prob. 15QCh. 4 - Prob. 16QCh. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32PCh. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - Prob. 35PCh. 4 - Prob. 36PCh. 4 - Prob. 37PCh. 4 - Prob. 38PCh. 4 - Prob. 39PCh. 4 - Prob. 40PCh. 4 - Prob. 41PCh. 4 - Prob. 42PCh. 4 - Prob. 43PCh. 4 - Prob. 44PCh. 4 - Prob. 45PCh. 4 - Prob. 46PCh. 4 - Prob. 47PCh. 4 - Prob. 48PCh. 4 - Prob. 49PCh. 4 - Prob. 50PCh. 4 - Prob. 51PCh. 4 - Prob. 52PCh. 4 - Prob. 53PCh. 4 - Prob. 54PCh. 4 - Prob. 55PCh. 4 - Prob. 56P
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- Three forces act concurrrently on a body. Force A has a magnitude of 200 N and points 50o N of W; force B has a magnitude of 100 N and points 30o E of N and force C has a magnitude of 300 N and points 40o W of S. What is the magnitude and direction of the resultant R = A - 2B - C?arrow_forwardTo move a large crate of mass 32.0 kg across a rough floor, with coefficient of kinetic friction between the crate and the floor is k = 0.45, you pull on it with a Force P at an angle of 30o above the horizontal and some else also pushes on the crate with a force F at an angle 45o below the horizontal. (The applied forces, F & P, on the crate starts it moving.) (a) Find the Normal force acting on the crate. (b) Find the acceleration of the crate if the applied force is F = 130 N & P = 300 N.arrow_forwardThe figure shows an overhead view of a 0.026 kg lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force F has a magnitude of 3N and is at e, - 31. Force F2 has a magnitude of 10 N and is at 02- 33". In unit-vector notation, what is t third force if the lemon half (a) is stationary, (b) has the constant velocity V (137-14) m (12h- 14) m/s?, where t is time? %3D and (c) has the V = %3Darrow_forward
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