Answer:
<h2> The answer is </h2><h2>a. 5g/mL</h2>Explanation:
Given data
mass m= 45g
volume v= 9mL
we know that density=m/v
substituting our given data we have
What is Density?
The Density of a body can be defined as the ratio of mass to volume,
or
Density, mass of a unit volume of a material substance. The formula for density is ,
where d is density,
M is mass, and
V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
The answer is: 201 J of kinetic energy.
<h2>Why?</h2>The motion of a pendulum (with no friction considered) is a continuous exchange between potential energy and kinetic energy.
So, at the highest point of its swing, the potential energy will be the maximum potential energy that the pendulum can have and the kinetic energy will be 0 since at max height the speed tends to 0.
On the opposite side, when the pendulum is at the bottom (the lowest point of its swing) the potential energy will be the minimum (tends to 0) but the kinetic energy will be the maximum.
Also, in the pendulum motion, the total energy is conserved, meaning that:
Where,
PE(h),is the potential energy at the highest point.
KE(h), is the kinetic energy at the highest point.
PE(l), is the potential energy at the lowest point (bottom of pendulum swing).
KE(l), is the kinetic energy at the lowest point (bottom of pendulum swing).
m, is the mass of the object.
g, is the acceleration of gravity.
v, is the speed of the object.
So, what is the energy at the bottom of its swing?
So, the pendulum has 201 of kinetic energy at the bottom of its swing.
Meaning that the energy is conserved.
Have a nice day!
Answer:
Q = 194.34 J
Explanation:
Given that,
100.0 mL of ethyl alcohol is heated from 10.0 C to 35.0 C.
We need to find the amount of thermal energy absorbed by the ethyl alcohol.
The density of ethyl alcohol is 0.790 g/mL.
The formula for heat absorbed is given by :
So, 194.34 J of thermal energy is absorbed by the ethyl alcohol.