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Problems with solutions
I.D
Level
Problem
Problem Topic
204
High school
Wire A and B are made of the same material , but the radius of wire A is twice that of wire B . If the same current flows in wires A and B , how much bigger/smaller are the following quantities in wire A compared with wire B: electric field , electron flow , current density ? . . . continues Electrostatics
199
High school
A child is pushing a box of mass 6 kg up a smooth inclined plane which is at an angle 17 degrees to the horizontal . The box is pushed parallel to the plane , and its acceleration is 0.7 m/s2 . Find the force between the plane and the box . . . . continues Force & Laws of Motion
200
High school
A ski slope is 1.2 kilometers long and is inclined at 13 degrees from the horizontal . A person begins at the top of the slope (assumed to be smooth) and accelerates down wards . Find the time it takes for the person to travel to slope . . . . continues Force & Laws of Motion
201
High school
A 75 kg person stands on a scale in an elevator . What does the scale read ( in N and kg) when the elevator is
(a) at rest
(b) ascending at constant speed of 3.0 m/s
(c) falling at 3.0 m/s
(d) accelerating upward at 3.0 m/s2 (s2 means a square)
(e) accelerating downward at 3.0 m/s2 (s2 means a square) continues
Force & Laws of Motion
202
High school
Two boxes , ml = 1.0 kg with a coefficient of kinetic friction of 0.10 , and m2 = 2.0 kg with a coefficient of 0.20 , are placed on a Plane inclined at theta = 30 degrees .
(a)what acceleration does each block experience ?
(b) if a taut string is connected to the blocks, with m2 initially farther down the slope , what is the acceler . . . continues
Force & Laws of Motion
196
High school
A child is pulling a box of mass 3.7 kg , along a smooth horizontal surface using a rope tide to it . The rope bears an angle 14.62 degrees above the horizontal . If the velocity of the box is 14.93 m/s and its acceleration is 0.2 m/s2 find the force between the box and the floor ( g = 9.81 m/s2 . . . continues Force & Laws of Motion
197
High school
A bucket of water which weighs 10.7 Newton's is pulled vertically using two forces . The first of magnitude 8.6 Newton's acts at an angle 59 degrees from the vertical . The second acts at an angle 18 degrees from the vertical . Find the net force acting on the bucket (due to the forces and the weight) in Newton's . . . continues Force & Laws of Motion
198
High school
A ball of mass 1.6 kilogram is projected with a velocity 19.5 m/s in a direction 30.7 degrees from the horizontal . The acceleration due to gravity is g = 9.81 m/s2 . What is the force acting on the ball the moment it is projected (in Newton's) ? . . . continues
Force & Laws of Motion
195
High school
A 10.0 uF capacitor is charged to 25.0 V . It is then connected in series with an uncharged 4.00 uF capacitor. The series combination is finally connected to a 60 V battery.
a) What is the new potential difference across the 10.0 uF capacitor ?
b) What is the charge on the 4.00 uF capacitor ?
. . . continues Electrostatics
194
High school
Three capacitors of 8 uF , 6 uF and 10 uF are connected in series . when the series arrangement was charged by being attached to a voltage supply , the voltage across the 6 uF capacitor was 5.0 V .
a) What was the supply voltage ?
b) What was the energy stored in the series capacitor circuit ?
. . . continues Electrostatics
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