First law of thermodynamics is based on conservation of energy that states that energy can never be destroyed, it changes from one form to other form of energy. As in the given image, boiler gives thermal energy in the form of steam and this thermal energy do work on turbine by rotating it.
Second law of thermodynamics states that heat energy always moves from high temperature region to low temperature region until no external energy is given. As in the given image, boiler have high temperature steam and turbine is low temperature region. Therefore, high temperature stream moves from lower area to the turbine.
Hence correct answer -
First law: Thermal energy is used to do work on the turbines.
Second law: High-temperature steam flows to an area of lower temperatures in the turbines.
This year is 60 years since I learned this stuff, and one of the things I always remembered is the formula for the distance a dropped object falls:
D = 1/2 A T²
Distance = (1/2) (acceleration) (time²)
The reason I never forgot it is because it's SO useful SO often. You really should memorize it. And don't bury it too deep in your toolbox ... you'll be needing it again very soon. (In fact, if you had learned it the first time you saw it, you could have solved this problem on your own today.)
The problem doesn't tell us what planet this is happening on, so let's make it easy and just assume it's on Earth. Then the 'acceleration' is Earth gravity, and that's 9.8 m/s² .
In 5 seconds:
D = 1/2 A T²
D = (1/2) (9.8 m/s²) (5 sec)²
D = (4.9 m/s²) (25 sec²)
D = 122.5 meters
In 6 seconds:
D = 1/2 A T²
D = (1/2) (9.8 m/s²) (6 sec)²
D = (4.9 m/s²) (36 sec²)
D = 176 meters
Answer:
The greater the rotation angle in a given amount of time, the greater the angular velocity. Angular velocity ω is analogous to linear velocity v. We can write the relationship between linear velocity and angular velocity in two different ways:
Answer:
v = 8.63 m/s
Explanation:
Neglecting the frictional forces, the law of conservation of energy can be applied to this situation as follows:
Potential Energy Gained By Athlete = Kinetic Energy Lost By Athlete
mgh = (0.5)mv²
gh = (0.5)v²
v = √2gh
where,
v = speed that the athlete must have when he plants the pole = ?
g = acceleration due to gravity = 9.8 m/s²
h = Height to be achieved by the athlete = 3.8 m
Therefore,
v = √(2)(9.8 m/s²)(3.8 m)
<u>v = 8.63 m/s</u>