Answer:
a) 28.1 m/s
b) 27.2 m
Explanation:
a)
Consider the motion of the marble in downward direction taking down direction as positive
v₀ = initial velocity = 5 m/s
v = final velocity as it hits the ground = ?
a = acceleration = 9.8 m/s²
d = vertical height traveled = 39 m
Using the equation
v² = v₀² + 2 a d
v² = 5² + 2 (9.8) (39)
v = 28.1 m/s
b)
t = time of travel = 1.90 s
y = vertical distance traveled
Using the equation
y = v₀ t + (0.5) a t²
y = (5)(1.90) + (0.5) (9.8) (1.90)²
y = 27.2 m
Answer:
6.71×10⁻⁷ m
Explanation:
Using thin film constructive interference formula as:
<u>2×n×t = m×λ</u>
Where,
n is the refractive index of the refracted surface
t is the thickness of the surface
λ is the wavelength
If m =1
Then,
2×n×t = λ
Given that refractive index pf the oil is 1.22
Thickness of the oil = 275 nm
Also, 1 nm = 10⁻⁹ m
Thickness = 275×10⁻⁹ m
So,
Wavelength is :
<u>λ= 2×n×t = 2× 1.22 × 275×10⁻⁹ m = 6.71×10⁻⁷ m</u>
Answer:
C The bending of wind because of Earth’s rotation
Explanation:
The Coriolis effect is the bending of wind due to earth's rotation. It is responsible for a broad range of phenomenon on the earth surface.
It stems from the deflection of a moving bodies in a frame of reference that is constantly rotating.
The deflection or blending of wind as the earth rotates is caused by this effect.
Due to this, the wind moves towards the right at the northern pole and the left at the southern pole.
Given
m1 = 15kg
vi1 = +20 m/s
vf1 = +5 m/s
m2 = 10 kg
vi2= -15 m/s
vf2 = ?
Procedure
Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.
The speed of the 10kg Ball is 7.5m/s
