Physics Middle School

In a simple machine, what does it mean :

i) If efficiency is said to be 65%.

Answers

Answer 1
It is an real machine because if efficiency is below100% it is real machine but if efficiency is 100% it is an ideal machine
Answer 2
This machine is has an efficiency of 65% which means the machines is ok not that efficient

Related Questions

A bus has velocity of 20 m/s towards east and another bus has velocity of 15 m/s in west direction . if they start to move from a point simultaneously, what distance do they cover in 2 minutes ? what will be their seperation ?

Help plss!!

Answers

Answer:

3.8 km

Explanation:

Eastern Side Bus

Velocity = 20m/s

Covers distance in 2 min (120sec) = 20×120 = 2400m = 2 km

Western Side Bus

Velocity = 15m/s

Covers distance in 2 min (120sec) = 15×120 = 1800m = 1.8 km

Separation Distance = 2+1.8 = 3.8 km

3.8 kilometers or km

Mahiya and Mrinmoy are in a relay around a square field with each side of length 60m. First, Mahiya runs at a speed of 6 ms−1 for 60m to pass a baton to Mrinmoy. Then Mrinmoy runs 120m at 4ms−1 while Mahiya runs through the field to reach the other corner. Then Mrinmoy passes the baton. But Mahiya is now tired since she has been constantly running. So, she only runs at 3ms−1 for the final 60m. What is the average speed of the baton in ms−1?

Answers

The average speed of the baton can be determined by dividing the total distance travelled by the total time taken for that travelling.

[tex]Average\ Time = \frac{Total\ Distance}{Total\ Time}[/tex]

First, we will find the total distance, by adding the distances travelled by both Mahiya and Mrinmoy, while carrying the baton.

[tex]Total\ Distance = Distance\ Travelled\ by\ Mahiya\ to\ pass\ the\ baton\ to\ Mrinmoy\ +\ Distance\ Travelled\ by\ Mrinmoy\ to\ pass\ the\ baton\ to\ Mahiya\ +\ Final\ Distance\ Travelled\ by\\ Mahiya[/tex]Total Distance = 60 m + 120 m + 60 m = 240 m

Now, we will find the total time taken for this travelling. To find out the total time we will divide each distance travelled by the speed of the traveller during that distance:

[tex]Total\ Time = \frac{60\ m}{6\ m/s}+\frac{120\ m}{4\ m/s}+\frac{60\ m}{3\ m/s}\\\\Total\ Time = 10\ s\ +\ 30\ s\ +\ 20\ s[/tex]

Total Time = 60 s

Now, we finally find the average speed of the baton by using the formula:

[tex]Average\ Time = \frac{Total\ Distance}{Total\ Time}\\\\Average\ Time = \frac{240\ m}{60\ s}[/tex]

Average Speed = 4 ms⁻¹

Learn more about average speed here:

https://brainly.com/question/12322912?referrer=searchResults

Why is it possible for railway tracks to buckle even though there are gaps in them?​

Answers

These gaps which are of the order of a few millimeters, are provided to allow room for the rails to expand the rise in temperature due to the atmospheric temperature as well as the friction caused by running of train. All materials expand when heated and contract when cooled. The extent of expansion and contraction is quite low to be noticed by people or make much difference in most situations. However, since each section of the rail is very long, the expansion due to heating is significant, and unless space is provided for expansion of rails, the rails will bend to accommodate the increased length. This will make the railway unfit for running of trains.

Answer: the tracks will buckle under the force.

Explanation: Heat-related expansion places a lot of stress on the ties, ballasts, and rail anchors that keep the tracks fixed to the ground.

Compare and contrast intensive and extensive physical properties, and give 3 examples of each.

Answers

Answer:

Intensive properties do not depend on the quantity of matter. Examples include density, state of matter, and temperature. Extensive properties do depend on sample size. Examples include volume, mass, and size.Intensive properties do not depend on the quantity of matter. Examples include density, state of matter, and temperature. Extensive properties do depend on sample size. Examples include volume, mass, and size.

Explanation:

Volume, mass, and size

PLEASE help with this!!! i'll give brainliest if right!!

Answers

1: decreases, increases, increases, stays the same
2: decreases, increases, increases, stays the same
3: increases, decreases, decreases, stays the same
4: increases, decreases, decreases, stays the same
Decrease increase is all of the answers for the graph

All of these are very important parts of studying physics EXCEPT

1. describing the organization of the universe
2. understanding natural laws
3. memorizing complicated explanations
4. deducing and applying natural laws

Answers

Answer:

4. deducing and applying natural laws

4 since i am right.
Other Questions
he part of the western coastal plain lying in the state of Maharashtra and Goa is called: use complete sentences to describe the transformation of triangle ABC into its image. a 2.00 kg object is moving east at 4.00 m/s when it collides with a 6 kg object that is initially at rest. after the collision the larger object moves east at 1 m/s. what is the final velocity of the smaller object after the collision A bullet is fired vertically upward a velocity of 80m/s to what height will the bullet rise above the point of projection Solve for x Round to the nearest tenth one place after the decimal ! Prompt: How did Improvements in transportation promote Industrialization in Great Britain? Answer in detail?? What precautions would you take to protect yourself from an earthquake, when you are at home and when you are outdoors? 3.How does the theory of efficient production apply to managers of government bureaus or departments that are not run for profit In a shipment of airplane parts, 6% are known to be defective. If 42 parts are found to be defective, how many parts are in the shipment? Somebody give the answer to the question attached please What decision made the Trail of Tears even more deadly?A. The Supreme Court's decision to reject the Cherokee legal defenseB. The government's decision to force the Cherokee to move duringthe winterC. The Cherokee decision to cooperate peacefullyD. President Jackson's decision to allow the Cherokee to keep theirland The weight of bags of fertilizer is normally distributed with a mean of 50 pounds and standard deviation of 6 pounds. What is the probability that a bag of fertilizer will weigh:a. Between 45 and 55 pounds?b. At least 56 pounds?c. At most 49 pound? When the function f(x) = 4(2)x is changed to f(x) = 4(2)x 13, what is the effect? (5 points) Select one: a. There is no change to the graph because the exponential portion of the function remains the same. b. The x-intercept is 13 spaces higher. c. The y-intercept is 13 spaces lower. d. All input values are moved 13 spaces to the left. ASAPThere are two competing scientific theories that try to explain the illusion of animation. Which of these answers is NOT one of the competing theories?Persistence of VisionImage-permanencePhi PhenomenonThe first who answers correct will get brainlest and those that are incorrected will be marked with a red flag. how to prepare hydrogen gas Help please. I dont understand A football was kicked through the air and it followed the path h\left(s\right)=-3s^2+75h(s)=3s 2 +75 . Let h\left(s\right)h(s) represent the height of the soccer ball after, s, seconds. What is sin 28?62817901528A.SoodenO c.O Based on the "Reactivity in Substitution Reactions" experiment, which molecule would be expected to react the fastest using AgNO3 in water-ethanol ? How did Sumers location in the Fertile Crescent allow the civilization to have specialized workers?