Answer: 300 s
Explanation:
The momentum 
is given by the following equation:
Where 
is the mass of the object and 
is the velocity.
In addition, according to the conservation of linear momentum, we have:
(1)
Where:
is the initial momentum of the astronaut, which is initially at rest
is the final momentum, being 
, 
and 
Then (1) is rewritten as:
(2)
Finding te velocity of the astronaut 
:
(3)
(4)
(5) The negative sign of the velocity indicates it is directed towards the spaceship, however its speed (the magnitude of the velocity vector) is positive 
On the other hand we have the following:
(6)
Where 
the distance between the astronaut and the spacheship and 
the time. So, we have to find :
(7)
Finally:
Answer with Explanation:
We are given that
Diameter of cylinder,
3 cm
Radius,
1m=100 cm
Height,h=12 cm=
Mass,m=750 g=
1kg=1000 g
Diameter of beaker,
Radius of beaker,
A.
Hence, the height of the water in the beaker rises when the cylinder is submerged=1.08 cm
B.Weight read on the scale after the cylinder is submerged
Where 
Density of water=
The molecules spread apart, so they take up more space. Because of this, they are less dense.
This means the density decreases as temperature increases.
We have that for the Question "A 2kg book is held against a vertical wall. The <em>coefficient </em>of friction is 0.45. What is the minimum force that must be applied on the <em>book</em>, perpendicular to the wall, to prevent the book from slipping down the wal" it can be said that the minimum force that must be applied on the <em>book is</em>
From the question we are told
A 2kg book is held against a vertical wall. The <em>coefficient </em>of friction is 0.45. What is the minimum force that must be applied on the <em>book</em>, perpendicular to the wall, to prevent the book from slipping down the wal
Generally the equation for the Force is mathematically given as
F=44N
Therefore
the minimum force that must be applied on the <em>book is</em>
F=44N
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From ideal gas law, PV=nRT
where P is the pressure, V is the volume of the container, n is number of moles, R is the gas constant and T is the temperature.
Hence, 
T= 110.65 k
Kinetic Energy = 
K.E= 
<h3>What is a kinetic energy? </h3>
The energy an object has as a result of motion is known as kinetic energy.
A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed. Kinetic energy is the type of energy that is transferred and is dependent on the mass and speed attained.
Kinetic energy can be converted into other types of energy and transported between objects. A flying squirrel may run into a chipmunk that is standing still, for instance. Some of the squirrel's initial kinetic energy may have been transferred to the chipmunk or changed into another kind of energy after the collision.
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