Answer:
a = 68 m/s²
Explanation:
Definition:
The acceleration is rate of change of velocity of an object with respect to time.
Formula:
a = Vf - Vi/t
a = acceleration
Vf = final velocity
Vi = initial velocity
t = time
Units:
The unit of acceleration is m.s⁻².
Given data:
a = Vf - Vi/t
a = 1700 m/s - 0 m/s / 25 sec
a = 1700 m/s / 25 sec
a = 68 m/s²
The third one is correct, not sure abt another one
Answer:
D
Explanation:
The correct answer would be that <u>the thermal energy of the sun is transferred to the pavement.</u>
Thermal energy refers to the internal energy possessed by a system by virtue of the movement of molecules within such a system. In other words, it is the heat energy possessed by a system.
When the thermal energy from the sun warms the pavement, it means that the thermal energy from the sun has been successfully transferred to the pavement. Thermal energy can be transferred by conduction, convection, or by radiation depending on whether the system is a solid, liquid, gas respectively.
<em>The correct option is, therefore, D. </em>
Answer:
The volume of gold is 3.3 cm³.
Explanation:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m³.
Other units are given below,
g/cm³, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Given data:
Mass of gold = 63 g
Density of gold = 19.32 g/cm³
Volume of gold = ?
Solution:
d = m/v
v = m/d
v = 63 g/ 19.32 g/cm³
v = 3.3 cm³.
Answer: Free-energy change of a reaction is a measure of the direction in which a net reaction occurs.
Explanation:
It is known that free energy change is represented by the symbol . Free-energy helps in determining the direction of a chemical reaction like if it is taking place in forward or backward reaction.
For a spontaneous reaction, the standard free-energy change is negative in nature and the reaction will proceed in forward direction.
Thus, we can conclude that free-energy change of a reaction is a measure of the direction in which a net reaction occurs.