Answer:
Neutrons released during a fission reaction cause other nuclei to split.
Explanation:
EDG 20
B-2s
C-400s
D-800s
Answer:
Option (B)
Explanation:
mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s,
Force, F = 40,000 N, Final velocity, v = 0 m/s
Let the impact time be t.
By use of Newton's second law
F = m a
where, a be the acceleration and m be the mass.
40000 = 2000 x a
a = 20 m/s^2
Acceleration is negative because the car is stopped.
Use first equation of motion,
v = u + a x t
0 = 40 - 20 x t
t = 2 second
A parsec is a unit of distance used in astrophysics to measure the distance between celestial objects. It is equal to 3.26 light-years or approximately 31 trillion kilometers.
A parsec is a unit of distance used in astrophysics to measure the distance between celestial objects. It is equal to 3.26 light-years or approximately 31 trillion kilometers. The concept of a parsec is based on stellar parallax, which is a method used to calculate distances to nearby stars.
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B. The field gets weaker.
C. The field changes direction.
D. The field disappears completely.
Answer: The correct answer is option (B).
Explanation:
The current carrying wire produces the magnetic field around it. More the current in the wire, stronger will be the magnetic strength around the wire. The magnetic field is stronger near this wire.
The direction of the magnetic field depends on the direction of the current.
In the given problem, Linus builds an electrical circuit with a battery and with wires that carry the current.The strength of the magnetic field depends on the amount of current flowing in the wire. As the battery weakens, the current also weakens.
Therefore, the magnetic field around the wires is weaker.
The magnetic field getting weaker is the correct answer when Linus builds an electrical circuit with a battery and with wires that carry the current. The correct answer is (B).
The strength of the magnetic field around the wires is directly proportional to the current flowing through the wires. As the battery weakens and the current decreases, the magnetic field strength around the wires also decreases.
Conversely, if the current increases, the magnetic field strength increases. This relationship is described by Ampere's law and the right-hand rule, which state that the magnetic field is directly proportional to the current.
Therefore, The correct answer is (B). The magnetic field getting weaker is the correct answer.
To know more about the magnetic field:
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30.0 min, you find that you have traveled 24.3 km.
How long will it take you to travel back upstream to
your original point of departure?
Answer:
hope this helps you're welcome
The time it will take to travel back upstream to your original point of departure is approximately 38.6 minutes, as determined by calculating the boat's speed against and with the river current.
This question involves understanding the concepts of velocity, time, and distance in physics. It relates to a situation where you are traveling downstream on a river with a certain current and later traveling back upstream against the current.
Firstly, we need to understand that the speed of the boat when it is moving downstream is its own speed plus the speed of the current. Given that you covered 24.3 km in 30 minutes (or 0.5 hours), we can calculate the boat's downstream speed as 24.3 km / 0.5 hours = 48.6 km/h.
The speed of the current is given as 1.50 m/s, which is approximately 5.4 km/h. So, the boat's own speed would be 48.6 km/h (downstream speed) - 5.4 km/h (current speed) = 43.2 km/h.
When heading back upstream, the boat's effective speed would be its own speed minus the speed of the current, which is 43.2 km/h - 5.4 km/h = 37.8 km/h. Now, to find out the time it would take to travel back upstream to the original point, we divide the total distance by the boat's effective speed, i.e., 24.3 km / 37.8 km/h = approximately 0.643 hours or around 38.6 minutes.
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Considering all the standard characteristics of acceleration, which involves the change in velocity concerning time, the statements (B), (C) and (D) are correct.
The given problem is based on the concepts and the fundamentals of acceleration. Acceleration is defined as the rate of change of velocity. Velocity is a vector quantity and is defined as speed in a given direction. Therefore, when any or both of the components of velocity is changing with time, a body is said to be accelerating i.e. acceleration involves a change of speed or change in direction, or a change in both speed and direction.
Now, as per the given problem,
A. Acceleration always involves changing speed is an incorrect statement because acceleration can occur when speed is constant but direction is changing.
B. Changing direction always involves acceleration is a correct statement because, a change in direction results in a change in velocity.
C Changing speed always involves acceleration is a correct statement because, changing speed results in a change in velocity.
D. Circular motion always involves acceleration is also a correct statement because in circular motion the direction is always changing, and this results in a change in velocity.
Thus, we can conclude that considering all the standard characteristics of acceleration, which involves the change in velocity concerning time, the statements (B), (C) and (D) are correct.
Learn more about the acceleration here:
Answer:
A. Acceleration always involves changing speed.
Explanation:
Acceleration is defined as the rate of change of velocity.
Velocity is a vector quantity and is defined as speed in a given direction. Therefore, when any or both of the components of velocity is changing with time, a body is said to be accelerating i.e. acceleration involves a change of speed or change in direction, or a change in both speed and direction.
Considering the statements:
A. Acceleration always involves changing speed is false because acceleration can occur when speed is constant but direction is changing.
B. Changing direction always involves acceleration is true because, a change in direction results in a change in velocity.
C Changing speed always involves acceleration is true because, changing speed results in a change in velocity.
D. Circular motion always involves acceleration is true because in circular motion the direction is always changing, and this results in a change in velocity