Choose the false statement regarding resistance. A) Longer wires have less resistance. B) Electrical resistance produces heat. C) Resistance slows the flow of current. D) The larger the diameter of the wire, the less resistance.
Answers
The answer would be:
A. Longer wires have less resistance.
Here is why:
The statement is false because longer wires tend to have greater resistance. Look at the formula of resistance below:
ρ = resistivity
L = length
A = cross-sectional area
As you can see Length of the wire is directly proportional to the resistance, which means as the Length increases, the Resistance increases.
Answer:
A. Longer wires have less resistance.
Explanation:
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A horse has a kinetic energy of 29,400 j if the horse has a mass of 300 kg what is the horses speed?
The force of repulsion between two like-charged particles will increase ifA) the distance between the charged particles is increased. B) the distance between the charged particles is decreased. C) the magnitude of the charge on both the particles is decreased. D) the magnitude of the charge on one of the particles is decreased.
18. The orbits of planets being elliptical was one the planetary laws developed by
Answers
Answer:
7.2 seconds
Explanation:
The formula is a = v/t, or acceleration = the change in velocity over the change in time.
In this case, you do simple algebra to rearrange the formula to solve for time: t = v/a, time = velocity/acceleration.
time = 18 m/s / 2.5 m/s^2 = 7.2s
1 velocity.
2 speed.
3 acceleration.
4 direction.
Answers
Answer : speed
Explanation :
Speed is defined as the distance travelled per unit time. It is a scalar quantity.
Velocity is displacement covered per unit time. It is a vector quantity. This means it have both magnitude as well as direction.
When captain told the passengers that the plane is flying at 450 miles per hour, then this shows the speed of plane. He is not talking about the direction in which the plane is flying.
So, this information describes the speed of plane.
Correct option is (2).
If he had also told them what direction they were flying, then
they would have been able to put the two pieces of information
together, and they would know the plane's velocity.
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Visible satellite images record visible light coming from the sun that is reflected by clouds, land, oceans or snow and ice.
There is a big difference between visible and infrared images since visible images record reflected light rather then emitted radiation.
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Answer:
Gravitational and resistance force.
Explanation:
The push or pull on any object which causes an object to move is called force. The forces can be of many types. The forces acting on the falling leaf are :
- Gravitational force : The force that acts in downward direction is called the force of gravity. This force pulls every object towards it.
- Resistance force/ normal : The force that act opposite to gravitational force is called the resistance force. It opposes the direction of motion of the leaf.
b. large
c. small
d. unbalanced
Answers
Before solving this question first we have to understand Newton's first law of motion
As per Newton's first law it is impossible to change the state of rest or uniform motion along a straight line unless and until it is compelled by some external unbalanced forces.
Everybody tends to oppose the change of state of rest due to their inertia.A book present on a table pushes the table with its weight in vertically downward direction while table applies same amount of force on the book in vertically upward direction.The net force acting on each body is zero.So the book will show no motion.
Actually balanced force have no role in changing the state of rest of the body. Only unbalanced force will cause the body to move.
Hence the washer who does not want to change his position will want the force acting on him to be [balanced ].
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Hope that helped =)