Answer:
6.41 s
Explanation:
Under constant acceleration we know that
average velocity × time taken = displacement
t = 6.41 s
The proof of used equation is given in the attachment.
D , since Voltage is one joule per coulomb
Answer:
The disorder in the universe is increasing with time.
Explanation:
The second law of thermodynamics states that the amount of entropy in the universe increases over time. Entropy expresses the number of different configurations that a system defined by macroscopic variables could assume. Therefore, is can be interpreted as a measure of the disorder, or randomness of a system.
It rises because hot air is less dense than cool air.
Answer:
Vd = 2.42 ×10⁻⁴ m/s
Explanation:
Given: A = 3.00×10⁻⁶ m², I = 7.00 A, ρ = 2.70 g/cm³
To find Drift Velocity Vd=?
Sol
the formula is Vd = I/nqA (n is the number of charge per unit volume)
n = No. of electron in a mole ( Avogadro's No.) / Volume
Volume = Molar mass / density ( molar mass of Al =27 g)
V = 27 g / 2.70 g/cm³ = 10 cm³ = 1 × 10 ⁻⁵ m³
n= (6.02 × 10 ²³) / (1 × 10 ⁻⁵ m³)
n= 6.02 × 10 ²⁸
Now
Vd = (7A) / ( 6.02 × 10 ²⁸ × 1.6 × 10⁻¹⁹ C × 3.00×10⁻⁶ m²)
Vd = 2.42 ×10⁻⁴ m/s
