Answer:
v = 120 m/s
Explanation:
We are given;
earth's radius; r = 6.37 × 10^(6) m
Angular speed; ω = 2π/(24 × 3600) = 7.27 × 10^(-5) rad/s
Now, we want to find the speed of a point on the earth's surface located at 3/4 of the length of the arc between the equator and the pole, measured from equator.
The angle will be;
θ = ¾ × 90
θ = 67.5
¾ is multiplied by 90° because the angular distance from the pole is 90 degrees.
The speed of a point on the earth's surface located at 3/4 of the length of the arc between the equator and the pole, measured from equator will be:
v = r(cos θ) × ω
v = 6.37 × 10^(6) × cos 67.5 × 7.27 × 10^(-5)
v = 117.22 m/s
Approximation to 2 sig. figures gives;
v = 120 m/s
Answer:
Explanation:
Let m be the mass of each car
mass of three cars = 3m
Kinetic energy of 3 coupled cars = 1/2 x 3m x 28²
= 1176 m
mass of 4 coupled cars = 4m
Its velocity v = 3m x 28 / 4m ( using conservation of momentum law )
= 21 m /s
Kinetic energy of 4m mass
= 1/2 x 4m x 21²
= 882 m
Loss of energy
= 1176 m - 882 m = 294 m
percentage of loss
=( 294 / 1176 ) x 100
= 25 %
This energy appears in the form of sound , heat etc on collision .
Convection is the movement of molecules in a solution according to the kinetic energy imparted by heat energy. This happens in liquids, gases, and plasmas. It can't occur in solids simply because they are just that. Solids. If the solid is heated enough to break the cohesion then it will turn to a liquid. Hope this helped. :)
Answer:
the answer is d
Explanation:
the answer is d because when light hits water the light will look like its bending (refraction) when it hits a glass its bouncing off of the glass (reflected).
