Answer:
133.62 kmh.
Explanation:
Time provided = 3.25 hours.
Distance to be covered 300 km
Times spent in first 100 km = 1 hour
Time spent in next 43 km
= 43 / 40 = 1.075 hours
Total time spent = 2.075 hours
Total distance covered = 143 km
Distance remaining = 300 - 143
=157 km .
Time remaining = 3.25 - 2.075
= 1.175
Speed required = Distance remaining / time remaining
= 157 / 1.175
= 133.62 kmh.
Answer: 0.435 m
Explanation:
Given
mass m=20 kg
initial speed u=2 m/s
coefficient of kinetic friction
deceleration which opposes the motion is given by
using
Answer:
28.42°
Explanation:
Critical Angle:This is the incident angle at which the angle of refraction is 90° when light passes from denser to less dense medium
from Refraction,
1/n = sinc......... Equation 1
Where n = refractive index of the liquid, c = critical angle.
make c the subject of the equation
c = sin⁻¹(1/n)............. Equation 2
Given: n = 2.1
Substitute the value of n into equation 2
c = sin⁻¹(1/2.1)
c = sin⁻¹(0.476)
c = 28.42°
Hence the critical angle = 28.42°
Answer:
Explanation:
Work done is defined as the product of force and the displacement in the direction of force.
W = F x d x Cos θ
Where, θ be the angle between force and the displacement.
The force of gravity acts downwards and the displacement is in upward, so the angle is 180. cos 180 = -1 , so the work done by the force of gravity is negative.
The force of rope acting in upwards direction and displacement also in upwards direction.
So, the work done is positive
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