Why is the efficiency of a machine always less than 100 percent

Answers

Answer 1

Answer:

Explanation :

The efficiency of a machine is always less than 100 %. This is because some of the energy gets lost in the form of heat energy, sound energy and frictional energy.

Mathematically it is defined as :

$\eta=(W_o)/(W_i)$

Where,

$\eta$ is the efficiency

$W_o$ is output work

$W_i$ is input work

Hence, this is the required explanation.

Answer 2

Answer: energy is lost due to friction or air resistance, through sound and heat energy.

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A coin rolls across the floor at an angular speed of 4 rotations per second. What is its speed in degrees persecond? Hint: One full rotation equals 360 degrees.

Answers

Speed in degrees per second or angular speed will be 25.13 radian

What is an angular speed?

Angular speed is defined as the rate of change of angular displacement and can be expressed as angular rotation / time

Total number of rotations = 4

one rotation makes an angle of = 360° = 2 π radian

coil is rolling at an angular speed of 4 rotation / second

4 rotations will make = 2π * 4 = 25.13 radian

hence , speed in degrees per second or angular speed will be 25.13 radian

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If there are 4 rotations per second and 360 degrees in 1 rotation, the angular speed is 1440 degrees per second. (4 * 360)

Usually angular speed is measured in radians though.

A traveler first drives 18.6 km east, then 30.3 km southeast, and finally 10.7 km south. Find the traveler's total displacement ?

Answers

If a traveler first drives 18.6 km east, then 30.3 km southeast, and finally 10.7 km south then the traveler's total displacement would be 51.30 kilometers.

What is displacement?

An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.

As given in the problem If a traveler first drives 18.6 km east, then 30.3 km southeast, and finally 10.7 km south then we have to find the traveler's total displacement,

the total displacement in the east direction = 18.6 + 30.3Cos45°

the total displacement in the east direction = 40 km

the total displacement in the south direction = 10.7 + 30.3Cos45°

the total displacement in the south direction = 32.12 km

The net resultant displacement = √(40² + 32.12²)

The net resultant displacement = 51.30 kilometers

Thus, the traveler's total displacement comes out to be 51.30 kilometers.

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East: 18.6+30.3/(sqrt2)
South: 19.7+30.3/(sqrt2)
Total displacement: sqrt(east^2+south^2) is 57.3 km

Potassium hydroxide (KOH) and hydrochloric acid (HCl) react in a beaker. They form potassium chloride (KCl) and water (H2O). What type of reaction is this?

Answers

Potassium hydroxide (KOH) and hydrochloric acid (HCl) react in a beaker. They form potassium chloride (KCl) and water (H2O). This type of reaction is a double replacement reaction wherein the two principal reactants exchange after the reaction. The Cl will combine to the K forming KCl and the H will add to the OH forming H2O.

Answer:

B double replacement reaction

Explanation:

took the test

Light traveling through air at 3.00 · 10^8 m/s reaches an unknown medium and slows down to 2.00 · 10^8 m/s. What is the index of refraction of that medium? n =

Answers

v 1= 3.00 · 10^8 m/s
v 2 = 2.00 · 10^8 m/s
The index of refraction:
n = v 1 / v 2 = 3.00 · 10^8 m/s : 2.00 · 10^8 m/s = 1.5
Answer:
The index of refraction of that medium is 1.5

Answer

The index of refraction of medium is 1.5 .

Explanation:

Equation for index of refraction is given by .

$n = (c)/(v)$

Where n is index of refraction in medium , v is speed of light in the medium and c is the speed of light in air .

As given

Light traveling through air at $3.00* 10^8$ m/s reaches an unknown medium and slows down to $3.00* 10^8$ m/s.

$c = 3.00* 10^(8)$

$v = 2.00* 10^(8)$

Putting the values in the formula

$n = (3.00* 10^(8))/(2.00* 10^(8))$

Solving the above

n = 1.5

Therefore the index of refraction of medium is 1.5 .

Signs marking __________ may indicate requirements associated with them and the hours when those requirements apply.

Answers

HOV lanes.

What is HOV lanes?

High-Occupancy Vehicle (HOV) lane is a lane that is designated for use by certain types of vehicles with a specified number of occupants.

It can offer travel-time savings to those who choose to carpool or take transit.

HOV lanes can move a greater number of people than a general traffic lane, and encourage carpooling and transit use by providing travel-time savings and a more reliable trip time.

HOV lanes are open 24 hours a day, seven days a week.

Here,

Signs marking HOV lanes may indicate requirements associated with them and the hours when those requirements apply.

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B. HOV lanes (not gore areas or toll booths, if those are the two other choices)

When heating water, during what temperature range will the temperature cease to change for some time?A. 98°C–102°C
B. 32°C–43°C
C. 54°C–62°C
D. 84°C–88°C

Answers

When heating the water , the temperature will cease to change for some time at the point where it almost reach the boiling point (that will differ according to the elevation of your place) , which usually in the range of : A. 98 C - 102 C

When heating water, the temperature will cease during 98°C-102°C to change for some time

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