How much voltage is required to run 0.025 A of current through a 36 Ω resistor?
1 answer:
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The initial velocity of the sled will be 7.34 m/sec. V is the initial velocity of the sled.
<h3>What is the law of conservation of momentum?</h3>According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
The given data in the problem is;
(m₁) mass of child = 38 kg
(u₁) is the initial velocity child = 2.2 m/s
(m₂) is the mass of sled = 68 kg
(u₂) is the initial velocity of sled = ?
(v) is the velocity after collision = 5.5 m/s
According to the law of conservation of momentum;
Momentum before collision =Momentum after collision
Hence,the initial velocity of the sled will be 7.34 m/sec.
To learn more about the law of conservation of momentum refer;
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Answer:
The radius of its orbit is .
Explanation:
Let suppose that Callisto rotates around Jupiter in a circular path and at constant speed, then we understand that net acceleration of this satellite is equal to the centripetal acceleration due to gravity of Jupiter. That is:
(1)
Where:
- Angular speed, measured in radians per second.
- Radius of the orbit, measured in meters.
- Net acceleration, measured in meters per square second.
In addition, angular speed can be described in terms of period (), measured in seconds:
(2)
And the net acceleration by the Newton's Law of Gravitation:
(3)
Where:
- Gravitation constant, measured in cubic meters per kilogram-square second.
- Mass of Jupiter, measured in kilograms.
Now we apply (2) and (3) in (1) to derive an expression for the radius of the orbit:
(4)
If we know that ,
and
, then the radius of the orbit of Callisto is: