A physics textbook weighing 22 N rests on a desk. The coefficient of static friction between the book and the desk is μ s = 0.60; the coefficient of kinetic friction is μ k = 0.40. You push horizontally on the book with a force that gradually increases from 0 to 15 N, and then slowly decreases to 5.0 N, as indicated in the table below. For each value of the applied force given in the table, give the magnitude of the force of friction and state whether the book is accelerating, decelerating, at rest, or moving with constant speed.
A physics textbook weighing 22 N rests on a desk. The coefficient of static friction between the book and the desk is μ s = 0.60; the coefficient of kinetic friction is μ k = 0.40. You push horizontally on the book with a force that gradually increases from 0 to 15 N, and then slowly decreases to 5.0 N, as indicated in the table below. For each value of the applied force given in the table, give the magnitude of the force of friction and state whether the book is accelerating, decelerating, at rest, or moving with constant speed.
A physics textbook weighing 22 N rests on a desk. The coefficient of static friction between the book and the desk is μs = 0.60; the coefficient of kinetic friction is μk = 0.40. You push horizontally on the book with a force that gradually increases from 0 to 15 N, and then slowly decreases to 5.0 N, as indicated in the table below. For each value of the applied force given in the table, give the magnitude of the force of friction and state whether the book is accelerating, decelerating, at rest, or moving with constant speed.
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
"looks" like a particle.)
...32 GO
In Fig. 22-55, positive
charge q = 7.81 pC is spread uni-
formly along a thin nonconducting
rod of length L = 14.5 cm. What are
the (a) magnitude and (b) direction
(relative to the positive direction
of the x axis) of the electric field
produced at point P, at distance
R = 6.00 cm from the rod along its
perpendicular bisector?
R
y
Р
+ + + + + + + + +-×
L
Figure 22-55 Problem 32.
1) A horizontal wire carrying current I in +x direction on the x-axis from x=0 to x=2
2) A vertical wire carrying current I upward at along the x=2 line from y=0 to y=8
3) A diagonal straight wire started at the origin and it ends at y=8 x=2 carrying a current in SE direction ( diagonally downward); y=4x
In a regional magnetic field that is given in vector notation by
B = ( y i - x j )/(x^2+y^2+25)
As components
Bx = (y+1)/x^2+y^2+25)
By = (1- x )/(x^2+y^2+25)
Find the integral expression for the net force for each branch carrying 5 ampere current.
An electric power station that operates at 30 KV and uses
a 15:1 set step-up ideal transformer is producing 400MW
(Mega-Watt) of power that is to be sent to a big city
with only 2.0% loss. What
which is located 270 km
away
is the resistance of the Two wires that are
being used?
52
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