Answer:
option A
Explanation:
given,
length of antenna = 1 m
traveling at speed = 100 Km/h
Earth's horizontal magnetic field is 5.5 x 10⁻⁵ T
radio antenna doubles in length (l₂ = 2 l)
car begins traveling at a quarter of the original speed (v₂ = v/4)
ratio of new emf
we know, ε = B l v
V₁ = B₁ l₁ v₁...........(1)
V₂ = B₂ l₂ v₂...........(2)
dividing equation (2) from (1)
V₂ = 0.5 V₁
the correct answer is option A
1 W = 1 J/s
Therefore;
Total energy = 90*1*60*60 J = 324000 J = 324 kJ
Such an evaporation must take place at a temperature near the body temperature. Assuming a body temperature of 37°C at which heat of vaporization is approximately 2413.1 kJ/kg (again assuming sweet behaves like water).
Then,
mC = 324 kJ, where m = mass of sweet and C = heat of vaporization
Therefore,
m = 324/C = 324/2413.1 = 0.13427 kg
Density = m/v => volume = m/Density = 0.13427/1000 = 1.3427*10^-4 m^3
1 m^3 = 1000 liters
Then,
1.3427*10^-4 m^3 = 0.13427 liters of sweet = 134.27 ml
Answer:
Explanation:
Initial speed, v = 10 x 10^3 m/s
Mass of the earth, M = 6 x 10^24 kg
Radius of the earth, R = 6.4 x 10^6 m
Maximum from the surface of earth, h = ?
Let m = Mass of the projectile
Solution:
Potential energy at maximum height = ( Potential + Kinetic energy ) at the surface
=
=
Answer:
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
