A, if u need a step-by-step just ask
Answer:
b. The final temperature of the coffee cup will be higher than 25°C but less than 75°C.
Explanation:
We know in thermal equilibrium.
Heat loss by one object = Heat gain by other object.
Now, heat is loss by the object whose temperature is higher than other because heat travels from high temperature to other.
And the object who gain heat its temperature increases till both body reach same temperature.
In this case, water loss heat, therefore its temperature decreases.
Similarly , metal block is at low temperature so its temperature increases.
Therefore , both water and metal block must have temperature less than and to have thermal equilibrium.
Answer:
Electricity works by getting a bunch of conductor elements together and creating a flow of electron-stealing patterns through them. This flow is called a current. Conductors need to be surrounded with insulators so the electrons can only go in one direction.
Explanation:
Answer:
Explanation:
To measure increase in length due to thermal expansion, the formula is
L₂ =L₁ ( 1 + α t ) where L₁ length increases to L₁ due to rise in temperature by t.
L₂ in both the case is same so
for aluminium
L₂ = 2.8 ( 1 + 23 X 10⁻⁶ t )
for steel
L₂ = 2.804 ( 1 + 12 X 10⁻⁶ t )
2.8 ( 1 + .000023t) = 2.804 ( 1 + .000012 t )
Solving this equation
t = 122C
Final temperature of both = 122 +20 = 142 C
Work done is given by the change in kinetic energy of an object
- The kinetic energy of the shovel, the shrub, and in Robert's movement were changed, therefore, work is done in the given processes,
Reason:
Work is done when the total energy of object is affected by the application of force on the object over a distance
Therefore;
- In option <em>A</em>, pushing the shovel into ground (to dig out the dirt) the requires the application of a force (push) over a distance, (into and out of the ground) therefore work is done
- In option <em>B</em>, picking the shrub up gives it gravitational potential energy, therefore, work is done
- In option <em>C</em>, carrying the shrub to the hole does visible work
- In option <em>D</em>, holding the shrub while lowering it into the hole does work by preventing the shrub from falling randomly
Therefore, <u>work is done in the given processes</u>
Learn more about work-energy theorem here:
brainly.com/question/10063455