To solve the astronaut's problem it is necessary to quickly consider the conservation of the moment.
By definition we know that,
Initial Momentum = Final Momentum
Where,
Human mass
Tank mass
v is the initial and final velocity of each object
In the case of the initial part we know that it is in a state without movement with respect to the ship.
In the case of the final moment there is a speed injection thanks to the oxygen tank, then,
Re-arrange to find the final velocity for astronaut,
Replacing
The astronaut has 4 minutes of air and must travel 200 meters therefore,
Re-arrange to find the time,
<em>He/She will reach the spacecraft within the stipulated time</em>
I am not sure of this, but it is either the third option or the last option.
Answer:
114.19186 m
Explanation:
v = Velocity of girl at bottom = 7.1 m/s
= Coefficient of kinetic friction = 0.045
g = Acceleration due to gravity = 9.81 m/s²
d = Distance
N = Normal force = 783 N
The weight of the sled and girl is considered as the sum of the frictional force and weight
Hence we use the following equation where the kinetic energy and potential energy are conserved
The sled travels 114.19186 m on the level ground before coming to a rest
Answer: An object at rest has no kinetic energy, but it may have potential energy resulting from its location or structure.
Explanation: To find the answer, we need to know more about the kinetic and potential energies.
<h3>What is kinetic energy of a body?</h3>
- Kinetic energy is a form of mechanical energy possessed by a body by virtue of its motion.
- Kinetic energy of a body of mass m moving with a velocity v is given by,
<h3>What is potential energy?</h3>
- Potential energy is a form of mechanical energy possessed by a body by virtue of its position in the field or configuration.
- PE is always associated with a conservative force.
- There cannot be potential energy due to frictional or viscous forces.
Thus, we can conclude that, an object at rest has no kinetic energy, but it may have potential energy resulting from its location or structure.
Learn more about the kinetic and potential energies here:
brainly.com/question/28044620
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