give the temperature and pressure at stp.
The stp is the standard temperature and
pressure, the standard temperature is o celcius , 273 kelvin and the standard
pressure is 1 atmosphere
a gas occupies 4.23 l at 2.25 atm. what is the volume at 3.46 atm?
According to boyle’s law
pressure is inversely proportional to volume , when volume increases, the
pressure reduces
As the pressure increases from 2.25 atm to
3.46 atm , the volume decreases from 4.23 l to 2.75l,
Boyles law states that the volume of a fixed
mass of a gas is inversely proportional to its absolute pressure provide the
temperature remain constant.
if the temperature of a piece of steel decreases what happens to its density
if a temperature of a piece of still
decreases, the volume also decreases, we know that according to the Charles law
that temperature is directly proportional to the volume provided that the
pressure remains constant
if the temperature of the steal
increases the volume also increases and if the temperature decreases the volume
also decreases.
Therefore if the temperature of an object
increases it volume also increases .
But density is
given as
Density is given as mass per unit volume,
Density is inversely proportional to
volume and likewise the temperature,
therefore when the temperature increases, the volume expand and this reduces
the mass to volume ratio, which is temperature.
We can say this in other words, when the
temperature of a body increases, it atoms and molecules change more kinetic
energy, the move and expand faster (
depending on the state of the matter). The increases in volume decreases the
mass per unit volume ratio which is density
as the density of a substance increases, the volume of a given mass of that substance also increases.
if a liter of water is heated from 20ºc to 50ºc, what happens to its volume?
when a liter of water is heater from 20 Celsius to 50 celsius, the temperature increases and according
to the Charles law,
Charles the temperature of a fixed mass of a
gas is directly proportional to its volume provided pressure remain constant.
If the temperature of a gas increases the
volume will also increases.
the density of ethanol is 0.789 g/cm3 at 20°c. what volume of ethanol has a mass of 15.5
grams?
Density is given as
VOLYME= 0.789* 15.5
= 12.2295 CM CUBE
when oil spills in the ocean why
does the oil float on the water
when oil spill in the ocean , the oil will float on
top of the water because the oil less dense than the water.
The water with density of 1g per cm cube is
denser than oil. Therefore the heavy mass will sink will the less dense will
float.
how to clean oil spills in water
we can clean oil spill on water by using what
will break the oil molecules away.
This include using detergent,
chemicals, booms and
most substances become less dense as the temperature increases which substance is an exception
water is the exception, water at 4 degree
centigrade tend to behave abnormally when heated, the volume decreases instead
of expanding, tis is called anomalous expansion of water.
When water is at temperature below zero degree
centigrade, the volume increases as the temperature , reaches zero degree it tends to decreases n volume as
the temperature continue to increase until it reaches 4 degree celsius
what is the density of an object having a mass of 8.0 g and a volume of 25 cm3?
when oil spills in the ocean, why does the oil float on the water?
The oil float because the oil is less dense
than water, when two liquid with different densities are mixed the denser
liquid will sink while the lighter liquid will float.
the work done in pushing a tv set a distance of 2 m with an average force of 20 n is
workdone=
force * distance,
the force is given as 20 newton and the distance moves is 2 meter
therefore the workdone = 20*2=40joules.
the power required to exert 4-n force over 3 meters in 2 seconds is
power is rate of energy consumption
or power is
workdone divided by time
workdone = 4* 3= 12 Newton
t =2seconds
power = 12/2 = 6j/s
when a car is braked to a stop, its kinetic energy is transformed to
when
car is break to stop it kinetic energy is converted to the frictional force
needed to top the, the car, also part of it is converted to heat energy.
We cannot say that it is converted to
potential energy but a car moving has a kinetic energy and by the time it stop
it loses it mechanical energy.
the mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is
momentum = mass * velocity
=mv
48= m*3
M=48/3
M=16kg
a rifle recoils while firing a bullet. the speed of the rifle's recoil is small because the
the speed
of the rifle recoil is small compared to that of the bullet because , the
bullet has a very small mass compared to the rifle.
And the newton’s law of motion requires that the action and reaction must be equal, thereforefore the recoil velocity mut be small since the mass is large
and on the bullet side the recoil velocity must be very high since the bullet
mass is very small.
Mv =mu
“ to every
action there is an equal and opposite reaction”
a ball rolling down an incline has its maximum kinetic energy at
a ball
rolling down an incline plane has it maximum kinetic energy when the velocity is maximum, as a ball start
to roll down an inclined plane it acceleration changes with time, meaning it velocity
increases and this velocity is maximum just before it hit the ground.
When a ball
start to roll , it potential energy is maximum while the kinetic energy is
minimum, when it is midway the potential and kinetic energy are equal, when it
is just about to hit the ground the potential energy is minimum while the
kinetic energy is maximum
a feather and a coin dropped in a vacuum fall with equal
a feather and coil falling through a vacuum will
have same acceleration due to gravity
due to the absent of air resistance.
In the absent of air resistance all object
will fall with same acceleration due to gravity.
the unit kilowatt-hour is a unit of
is the unit
for measuring electric power consumption.
an object has gravitational potential energy due to its
mass
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