1. How much pressure do you experience, when you balance a 5kg ball on the tip of your finger which has an area of 1cm square.
a. 490 kpa
b. 4600 pa
c. 34n
d. No answer
2. Heat can be define as
a. The change in the temprature of a body
b. The flow of temprature from one body to another
c. Energy that flows from place to place as a result of the difference in temprature between them
d. The measure of hotness or coolness of a body
3. Two bodies may be said to be in thermal equilibrium if
a. The bodies are thermally insulated from one another
b. The bodies are not in termal equilibrium with another body
c. If one body losses heat to the other
d. If they are not net flow of heat between the two bodies two bodies in thermal contact
4. Heat capacity has units as
a. J/kg.k
b. J/mol.k
c. J.ohm/sec.k square
d. W/m.k
(1)
Pressure is force (N) per unit area (m^2):
P = F/A
P = mg/A
P = (5 kg * 9.8 m/s^2) / (0.0001 m^2)
P = ?
(2)
Heat is simply the flow of energy.
(3)
If there are no more net flow of energy between them.
(4)
Heat capacity units is J/K.
Specific heat capacity units is J/kg-K
1. To calculate the pressure experienced when balancing a 5kg ball on the tip of your finger, you can use the formula: Pressure = Force / Area.
First, you need to determine the force exerted by the ball. Since the weight of the ball is 5kg, we can calculate the force using the formula: Force = mass * acceleration due to gravity. The acceleration due to gravity is approximately 9.8 m/s^2.
Force = 5kg * 9.8 m/s^2 = 49 N (Newtons)
Next, you need to determine the area of the tip of your finger. The question states that the area is 1cm^2, but we need to convert it to square meters for consistent units. 1 cm^2 is equal to 0.0001 m^2.
Now we can substitute the values into the formula: Pressure = 49 N / 0.0001 m^2.
Calculating the pressure, we get: Pressure = 490,000 Pa (Pascals).
Therefore, the correct answer is a. 490 kPa.
2. Heat can be defined as c. Energy that flows from place to place as a result of the difference in temperature between them.
Heat is the transfer of energy caused by a temperature difference. When there is a temperature gradient between two objects or regions, heat flows from the hotter region to the colder region until they reach thermal equilibrium.
3. Two bodies may be said to be in thermal equilibrium if d. There is no net flow of heat between the two bodies in thermal contact.
Thermal equilibrium occurs when two objects are at the same temperature and there is no net flow of heat between them. It means that they have reached a state of balance, and there is no further transfer of thermal energy between them.
4. Heat capacity has units as a. J/kg.K.
Heat capacity is the amount of heat energy required to raise the temperature of a substance by one degree Kelvin (or Celsius). It is expressed in terms of energy (Joules) per unit mass (kilogram) per degree Kelvin (or Celsius). Therefore, the correct unit for heat capacity is J/kg.K.