Answer:
The duration of the movie is longer than 2 hrs.
Explanation:
Given:
The duration of the movie observed by the crew on the spacecraft is 2 hrs.
According to time-dilation formula:
Here, is the required time, is the original time, is the velocity of the spacecraft and is the velocity of light.
Since , so .
So the time required will be large.
Answer:
Electromagnetic waves do not require a medium in order to transport their energy. Mechanical waves are waves that require a medium in order to transport their energy from one location to another. ... Sound is a mechanical wave and cannot travel through a vacuum.
Answer:
Earth Day is observed globally
Explanation:
Answer:
1.058 decapoise
Explanation:
The specific gravity of a substance is equal to the density of substance in CGS system and if the specific gravity is multiplied by 1000 then we get the density of substance in MKS system.
Density of steel, ρ = 7800 kg/m^3
density of oil, σ = 900 kg/m^3
v = 0.6 m/s
diameter = 13 mm
radius, r = 6.5 mm
Let η be the coefficient of viscosity.
Use the formula for the terminal velocity
η = 1.058 decapoise
Answer:
Explanation:
We shall represent each move of coach in vector form , considering unit vector i towards east and unit vector j towards north .
he drove 100 m North
First displacement D₁ = 100 j
200 m East to reach the 133
second displacement D₂ = 200 i
500 m North to reach Papa John's
third displacement
D₃ = 500 j
Total displacement ( resultant displacement )
= D₁ + D₂ + D₃
= 100 j + 200 i + 500 j
= 200 i + 600 j
magnitude of resultant displacement
= √ ( 200² + 600² )
= √ 40000 + 360000
= 632.45 m