Answer: The correct answer is Option C.
Explanation:
Ohm's Law is the law which has given a relationship between current, potential difference and the resistance in a circuit. This law states that the current flowing through the conductor is directly proportional to the potential difference across two points.
Mathematically,
or,
where,
V is the potential difference across two points. It is expressed in Volts (V).
I is the current through the conductor. it is expressed in Amperes (A).
R is the resistance. It s expressed in Ohms
We are given:
By putting these values in above equation, we can easily calculate the value of voltage expressed in volts.
Hence, the correct answer is Option C.
Answer: 5.9 m/s
Explanation:
This problem can be solved by the Conservation of Momentum principle, which establishes that the initial momentum must be equal to the final momentum :
(1)
Where:
(2)
(3)
is the mass of the skater
is the mass of the ball
is the initial velocity of the skater and the ball
is the final velocity of the ball
is the final velocity of the skater
Substituting (2) and (3) in (1):
(4)
Isolating :
(5)
(6)
Finally:
Answer:
The velocity of the ball becomes half when the time period is doubled.
Explanation:
Let be the time period of the ball, be radius and be the velocity of the ball performing circular motion.
Now, for a circular motion, the velocity is given as:
From the above relation, we can conclude that, velocity is inversely proportional to time period if the radius is constant.
This means that if time period is increased, velocity will decrease and vice-versa.
So, if time period is doubled, the velocity will reduce by half. This can be verified mathematically also given below.
Divide by , we get
Here, are the new and old velocities.
So, it can be concluded that if the time period is doubled, velocity is reduced by half.
Answer:
When truck is at rest while student is under motion
Explanation:
Since it is obvious that the mass of a truck is more than that of a student, we know that momentum is a product of mass and velocity
P=mv where m represent mass, v is velocity. When the student has more speed than that of truck, he exerts more momentum. The only way a student can exert more momentum is by having more speed while the truck is at rest. In such case, the momentum of truck will be zero while momentum of student will have a value
The phase is frequently used to describe transitions between the three fundamental states of matter. Condensation is the phase change in the atmosphere forms clouds.
The physical process of changing a medium's state from one to another is known as a phase transition in the domains of chemistry, thermodynamics, as well as other related sciences. The phase is frequently used to describe transitions between the fundamental states of matter.
The physical characteristics of a phase of such a thermodynamic system as well as the states of matter are constant. Some properties of a particular medium change throughout a phase transition as a result of a change in the environment, including such temperature or pressure. Condensation is the phase change in the atmosphere forms clouds.
Therefore, condensation is the phase change in the atmosphere forms clouds.
To learn more about phase transition, here:
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