Answer: The fork feels colder when you touch it because Steel conducts thermal energy better than plastic. The correct statement is 1
Explanation:
The ability of a material to transfer heat energy in an environment is known as thermal conductivity. It feels cooler to touch a steel spoon than a plastic spoon found in the same temperature because steel which is a type of metal is a highly efficient thermal conductor than spoon which is a plastic.
Metals can be defined as those substances which forms positive ion in a chemical reaction by lossing it's electrons. It has the following properties:
--> it is solid at room temperature
--> it has high melting point
--> it has high boiling point and
--> it is malleable.
Metals are said to be good thermal conductor because they contain free flowing conduction electrons. Therefore, when you touch a steel spoon and plastic spoon, it feels cooler because the steel metal is able to conduct heat away from your hand faster than the plastic which is a poor conductor of heat.
Answer:
= 8.33 Watt
Explanation:
where,
p = resistivity
l = length
A = cross section area
Given that ,
p = resistivity = 6.0 × 10–8 Ω
l = 2m
A = cross section area = 2.0 mm × 2.0 mm = 4 x 10^-6 m^2
A = 2 x 2 mm^2 = 4 x 10^-6 m^2
p = 6 x 10^-8 ohm metre,
V = 0.5 V
Let R be the resistance of the rod
R = 3 × 10⁻²Ω
Heat generated = V^2 / R
= (0.5)^2 / (3 x 10^-2)
= 8.33 Watt
Answer:
Explanation:
Given
Speed of Primary wave 
Speed of secondary wave 
difference in timing of two waves are 
Suppose both travel a distance of d km then
Subtract (ii) from (i)
![d[\frac{1}{4.5}-\frac{1}{8}]=77.2](https://tex.z-dn.net/?f=d%5B%5Cfrac%7B1%7D%7B4.5%7D-%5Cfrac%7B1%7D%7B8%7D%5D%3D77.2)
![d[0.0972]=77.2](https://tex.z-dn.net/?f=d%5B0.0972%5D%3D77.2)
Acceleration is defined as the rate of change for velocity. If the object is accelerating it is changing its velocity.
Explanation:
define the term specific heat capacity of water
