 SEMATHS.ORG Updated: 21 July 2021 06:15:00 PM

# What is an open equation?

An open equation is an equation with one or more variables that may be true or false depending on the values of the variables.

## From these considerations, what is an open sentence in math?

: a statement (as in mathematics) that contains at least one blank or unknown and that becomes true or false when the blank is filled or a quantity is substituted for the unknown.

## With that knowledge in mind, what is a true equation?

A true equation is a mathematically accurate equation. To make a true equation, check your math to make sure that the values on each side of the equals sign are the same. Ensure that the numerical values on both sides of the "=" sign are the same to make a true equation. For example, 9 = 9 is a true equation.

## With this in view what is a Formula Equation example?

A formula is a fact or rule that uses mathematical symbols. It will usually have: an equals sign (=) two or more variables (x, y, etc) that stand in for values we don't know yet.
Example: The formula for finding the volume of a box is:
x = 2y - 7Formula (relating x and y)
a2 + b2 = c2Formula (relating a, b and c)

#### Why is steam turbine efficiency so low?

A decrease of the steam pressure pt in the condenser causes a decrease of the steam condensation temperature and consequently increases the temperature difference in the cycle. The efficiency of steam-turbine units increases when regenerative extraction of steam from the turbine is used.

#### What is unit of time and speed?

Speed and velocity are both measured using the same units. The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second .

#### What is steam turbine working principle?

In simple terms, a steam turbine works by using a heat source (gas, coal, nuclear, solar) to heat water to extremely high temperatures until it is converted into steam. As that steam flows past a turbine's spinning blades, the steam expands and cools.

#### What is SI unit of force?

The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

#### Why steam is used in turbine?

As its name suggests, a steam turbine is powered by the energy in hot, gaseous steam—and works like a cross between a wind turbine and a water turbine. Steam turbines use high-pressure steam to turn electricity generators at incredibly high speeds, so they rotate much faster than either wind or water turbines.

#### What is the unit of speed?

Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour. For air and marine travel the knot is commonly used.

#### What is difference between steam turbine and gas turbine?

The primary difference between steam and gas turbines is the fact that steam turbines receive power from expanding steam. Fuels such as natural gas can heat condensed water in a boiler, but it's also possible to utilize renewable thermal energy for this heating. This water-based cycle is the Rankine Cycle.

#### Which turbine has highest discharge?

Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Pelton has high head and low discharge. Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Kaplan has low head and high discharge.

#### Which turbine has highest speed?

Which turbine has highest speed? Explanation: Francis turbine has a specific speed of 60 to 300 rpm. Specific speed of Pelton turbine is lowest. Speed of Kaplan turbine is 2 to 3 times more than that of Francis turbine.

#### What is SI unit of force Class 8?

Answer: A pull or a push on an object is called force. Force can change the shape, direction or state of motion of a body. The SI unit of force is called newton (N).

#### What is distance divided by time?

Distance traveled divided by the time taken to travel the distance is called speed. 1. The formula for speed can be written as: speed = distance/time. Speed is distance divided by time.

#### What is SI unit of force and pressure?

Pressure—the effect of a force applied to a surface—is a derived unit, obtained from combining base units. The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter. The conversion between atm, Pa, and torr is as follows: 1 atm = 101325 Pa = 760 torr.

#### What are the 3 types of equations?

There are three major forms of linear equations: point-slope form, standard form, and slope-intercept form.

#### Which turbine has lowest efficiency?

Among the following which turbine has least efficiency? Explanation: Pelton is impulse turbine and remaining are reaction turbine, efficiency of reaction turbine is more compared to impulse turbine. 6.

#### What is SI unit of force Class 9?

The S.I. unit of force is Newton. F = ma. 1 Newton = 1 kg x 1 m/s2.

#### What is unit speed of turbine?

The unit speed is the speed of the turbine operating under one meter head. Mathematically, unit speed, The unit discharge is the discharge through a turbine when the head on the turbine is unity. Mathematically, unit discharge, The unit power is the power developed by a turbine when the head on the turbine is unity.

#### What is the simple formula of distance?

Learn how to find the distance between two points by using the distance formula, which is an application of the Pythagorean theorem. We can rewrite the Pythagorean theorem as d=√((x_2-x_1)²+(y_2-y_1)²) to find the distance between any two points.

#### What's the difference between a formula and an equation?

equation: A statement formed by placing an equals sign between two numerical or variable expressions. formula: An equation that states a rule about a relationship.

#### Which turbine has highest efficiency?

Large Francis turbines are individually designed for each site to operate with the given water flow and water head at the highest possible efficiency, typically over 90% (to 99%). In contrast to the Pelton turbine, the Francis turbine operates at its best completely filled with water at all times.

#### What are four types of turbines?

While turbines can be classed as either impulse or reaction according to the way they function, there are four broad types of turbines categorized according to the fluid that supplies the driving force: steam, gas, water, or wind.

#### What does an algebraic equation look like?

Algebraic equation, statement of the equality of two expressions formulated by applying to a set of variables the algebraic operations, namely, addition, subtraction, multiplication, division, raising to a power, and extraction of a root. Examples are x3 + 1 and (y4x2 + 2xy – y)/(x – 1) = 12.

#### Why LP turbine is double flow?

For turbines of large output, it is normal to have several double-flow low pressure (LP) cylinders operating in parallel. The second benefit is that the double-flow cylinder effectively reduces to zero the axial thrust caused by the steam forces on the moving blading.

#### What are math equations?

In algebra, an equation can be defined as a mathematical statement consisting of an equal symbol between two algebraic expressions that have the same value. In an algebraic equation, the left-hand side is equal to the right-hand side.

#### What is the formula of time?

To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

#### How efficient is a turbine?

In actuality, turbines are typically 80 to 90 percent efficient, but this factor does not need to be included here to show the importance of condenser performance. Conditions are: Main Steam (Turbine Inlet) Pressure – 1,000 psia. Main Steam Temperature – 1,000 F.

#### Where is steam turbine used?

Steam turbines are found everywhere on the planet and are used to turn generators and make electricity or create propulsion for ships, airplanes, missiles. They convert heat energy in the form of vaporized water into motion using pressure on spinning blades.