Q29.4)
Yes the farmer is correct. Since the alternative current is flowing through the wires, and each
time theyre changing the direction of the flow, therell be a magnetic field that makes the fence
to oppose it, so there will be a voltage across the fen
Q28.4)
If we look at both conductors as system then we can see that conductor on attracts the other
one also second conductor attracts the first one, and the force they exert on each other is action
and reaction force (Newtons third law). This means if we
Q26.6)
a) False, Two resistors are connected in parallel, so
b) True,
. Since , according to Ohms law,
because by using the junction rule we will see the two currents are the
same.
c) True, since two resistors are connected in parallel and
, according to
Q27.10) were going to have many orientations, but by using the right hand rule, were going to
have two major final shapes in which the wire is a circle. In one of them the current is going to
flow clockwise and the other one, its going to flow counter clo
Q21.3)
Yes, the neutral insulator will be polarized as the last time because positive charges always
attract negative charges and repel positive charges. This is the general rule between charges,
so the neutral insulator will polarized because the same ty
Q25.2)
Q25.11)
The current is the flow of the electron through a conductor. When these electrons are moving
through a resistor, they will collide with the electrons of the resistor, so some of their potential
energy will change to work done by the frictio
Q24.1)
By looking at equation 24-2 :
, we can see that if we decrease d, the capacitance will
become larger. The electric field will become so strong, if this distance becomes so small, close
to zero, so the charges will move from one plate to the other p
Q23.1)
The electrical potential only depends on the property of the electric field, but the potential
energy depends on both electric field and the test charge that were using at each point. In other
words, in one point of electric field we can have many
Q22.3)
No, it wont change the flux through any surface because the charge is outside of the surfaces,
and only the charges inside of the surfaces will affect the flux through the Gaussian surfaces.
Q22.10)
No it doesnt contradict the statement because the
Q17.2)
No its not true because the Celsius degree and Kelvin are different units of temperature.
According to conversion of Celsius degree to Kelvin, Kelvin is going to be a degree of Celsius
plus the constant of 273, so when we are doubling the Kelvin te
Q20.9)
This is the same process as the refrigerator. In this process, the wet cloth is the same as the
cold reservoir and the wind is doing work on it and transferring the heat from the wet cloth to the
surrounding air. As the second law says, in order to
Q19.6)
When the ice melts, its volume decreases, so the work done by ice is negative. The change in
internal energy is equal to the heat transferred to the ice minus the work done by the ice. Since
the ice received the heat, the transferred heat is positi
Q29.4)
Yes the farmer is correct. Since the alternative current is flowing through the wires, and each
time theyre changing the direction of the flow, therell be a magnetic field that makes the fence
to oppose it, so there will be a voltage across the fen
Q18.2)
No, its not possible to use an equivalent Celsius temperature instead of Kelvin because they
are not factor of each other. A constant (273) needs to be added to Celsius temperature in order
to convert it to Kelvin, so if we want to make R appropria
1) A balloon or feather doesnt fall as fast as a brick because of the air the resistant. When
an object is falling, the air resistant is an upward force. The air resistant force for a falling
balloon or feather is stronger than a falling brick, so the net
Q14.2)
The water will rise to the same height because the pressure of the system at that height is equal
to pressure of atmosphere. The extra weight of the water in the funnel is being supported by the
normal force of the funnels sides.
Q14.11)
We have to
Q13.4)
We are removing the pebble from the box, so basically we are decreasing the mass of system.
Since we removed the pebble at maximum distance from the equilibrium point, the elastic
potential energy and the total energy of the motion remain the same.
Q11.8)
The center of gravity must be along that line because the net torque on horseshoe is zero. The
torque of normal force is zero because its torques lever arm is zero, so the torque of gravity
force must be zero which means its torques lever arm is ze
Q12.2)
The new period will be
Q12.17)
According to Newtons law of gravitation, the gravitation force between two objects has an
inversely proportional relationship to their distance from each other squared. Since the masses
are the same at any time, the m
Q10.10)
No, the torque is different from the work done by a force. The work done by a force is the dot
product of force and distance, which means the product of the parallel component of force to
distance and the distance. The torque is the cross product
Q8.2)
Catching a bowling ball with the same momentum would be easier because it has a smaller
velocity. When they have the same momentum, the ratio of the bowling balls velocity to the
baseballs velocity is equal to the ratio of the baseballs mass to bowl
Q9.5)
According to radial acceleration formula ( ), the radial acceleration is an inversely proportional
to the radius. Since the velocity of the chain is the same in all points, we can say the ratio of the
radial acceleration of front sprocket to rear sp
Q7.4)
There are some differences. The value of initial gravitational potential energy is zero for
students who used the roof as their origin, however it equals the weight of egg times the height
of the building for other students. The value of final poten
Q5.2)
An example for where the normal force is equal to weight is when an object is on a flat plane.
For example, the weight and the normal force are equal when a book is on a table because they
apply the same force to each other.
Two examples for where t
Q6.3)
No the work done is not zero. According to Newtons third law, pair forces are between two
different objects, so the only force that acts on the body is the force of pull which is transmitted
through the tension of the rope. The body is accelerating
Q4.10)
According to F=ma formula we will have:
, so the unit of mass will be:
in term of the new fundamental units.
Q4.34)
When the brick drops on our foot, it only has motion in y-direction or vertical motion. The vertical
motion on Earth and Moon is a m
Q3.3)
The projectile has the acceleration of g, which is downward (toward the ground) all the time
during the motion. The initial velocity must have an angle between 0 and 90 degree with the
horizon to make a parabolic path, so the velocity angle with hor
Q1.3)
No it is not possible because the meter is different unit from what we use to calculate the
tangent. For computing the tangent, we have to use angles unit which is measuring in degree
or radian, but here in this question it wants us to compute tange
Q2.3)
Yes, it can reverse its direction of travel only once. When the acceleration is in opposite
direction of velocity, the object will slow down until the velocity becomes zero. Then, it reverses
its direction of travel and starts to speed up in directi