Answer:
s(t)=7t
Explanation:
We are given that
Length of side of square initially=0 cm
Side of square increasing at the rate=7 cm/s
We have to find the formula to express the side length of the square s(in cm) in terms of the number of seconds t.
According to question
Taking integration on both sides then, we get
Substitute t=0 and s=0
Now, substitute the value of C then, we get
s(t)=7t
This is required formula that express the side length of the square s(in cm) in terms of the number of seconds t, since the square's side length began growing.
Answer:
- 6.48 J K⁻¹
Explanation:
Temperature of gas = 20°C
= 273 +20 = 293 K.
As temperature is fixed , there will be no change in gas internal energy
Δ E = 0
From the relation
Δ Q = Δ E+ Δ W
Work done on the gas is 1.9 x 10³
Δ W = - 1.9 x 10³ J
Δ Q = - 1.9 x 10³ J
Δ S = Δ Q / T
=
= - 6.48 J K⁻¹
Density = Mass/Volume
2.5 g/ml = 5g/Volume
Volume = 5g/(2.5 g/ml)
= 2 ml
A machine can never be 100% efficient because some work is always lost
due to the lack of materials or equipment that would convert work by 100%. It follows
the second law of entropy. The ideal engine is known as Carnot’s engine having
a 100% efficiency. So far, no engine has ever gotten to 100%.
This is the definition of specific heat capacity. 1000J of heat are required to raise the temperature of 1kg of the compound by 1 degree. Therefore a 1000J have been added to the block.