PHYSICS HIGH SCHOOL

What is the velocity of an upward moving 500kg elevator that has 4000 of energy

Answers

Answer 1
Answer:

Answer:

4 m/s

Step-by-Step Explanation:

E = mgh and h = E/mg

So if you put your numbers in the formula : h = 4000J/500 * 10

you will get h = 4/5 meters

use this , If the elevator moves from top to the ground in a constasnt acceleration you will have all energy (4000 J) transformed into acceleration to speed up its motion.

(All potential energy will be turned into movement energy). As explained in this formula;

mgh = mv²/2 , solve out (v) from the equation

v = √2gh = √2·10·4/5 (digits are together- not related to the problem, just for clarification) = 4 m/s

Answer the velocity of the elevator is

4 m/s

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Why is a raindrop a particularly damaging element to soil

Answers

Answer:

Raindrops are considered damaging to the soil in the following ways:

  1. If it is too wet or too dry, nutrients in the soil can run off and not make it to the plants' roots, leading to poor growth and overall health.
  2. over-watering or too much rain can also lead to bacteria, fungus, and mold growth in the soil
  3. If the average rainfall is much lower or higher than the ideal, it can lead to significant problems, from drowned crops to lower yields.
  4. The soil can also start to collect bacteria, mold, and fungus, which can then be absorbed by the plant. While this isn’t as common in crops as it is in indoor plants, poor drainage and irrigation systems can lead to these types of growths taking control over your crops.
  5. raindrops when it is excessive can lead to erosion and leaching of the soil
  6. soil loss is mostly affected by increasing runoff discharge of rainwater                                      

Cheers!
Rain drop causes Erosion

In the study that the FBI did on examining the physical characteristics of hair, what percentage of the “matches” were not really matches at all?

Answers

About 10 % of them were not really matches at all

Since DNA analysis  take a huge amount of money , the FBI only test the suspect whom they almost 100% sure is the suspect.

But according to researches, about 10 % of the 'matches' in the physical characteristic of hairs were contradicted by the DNA analysis

A 2-kg object is moving 6 m/s in a horizontal direction.How much net force is required for this object to continue its state of motion?
Α. Ο Ν
B.
2N
C.
3 N
12 N​

Answers

Answer: A) O N

Explanation:

An object in motion will maintain its state of motion. The presence of an unbalanced force changes the velocity of the object.

Potential energy in an electrical system is stored?

Answers

In a battery or capacitor.

Which of the following is a major ocean on Earth? A. Mediterranean
B. Gulf of Mexico
C. Bering Sea
D. Indian

Answers

The Indian Ocean. 
The rest of your options are not oceans, they are bodies of water. (e.g: lakes,rivers,gulfs) 
The answer is d, the Indian Ocean

A steering wheel position sensor is being discussed. Technician A says that the sensor is used to determine the direction of the steering wheel. Technician B says that the sensor detects how fast the steering wheel is turned. Which technician is correct?

a. Technician A
b. Technician B
c. Both Technicians
d. Neither Technician

Answers

Answer:

c. Both Technicians

Explanation:

A steering wheel position sensor is being discussed. Technician A says that the sensor is used to determine the direction of the steering wheel. Technician B says that the sensor detects how fast the steering wheel is turned.  the following are used to sense

Hall-effect, Photo cell, Potentiometer are used  on vehicles equipped with an electronically controlled suspension

sensors are like indicators in a vehicle to give signals for both direction and the speed of the vehicle

c. Both Technicians
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