Explanation:
Volume of 10 coins = 100ml - 75ml = 25ml
Volume of 1 coin = 25ml / 10 = 2.5ml
The average volume of each coin is 2.5ml.
Answer:
Explanation:
According to Newton's second law, the tension in the string is equal to the centripetal force, since the mass is under an uniform circular motion:
Here is the centripetal acceleration, which is defined as:
So, replacing:
In this case we have , and . Thus, the tension required to mantain uniform circular motion is:
<u>Answer</u>
10 feet
<u>Explanation</u>
The Occupational Safety and Health Administration (OSHA) requires one to be not less than 10 feet from overhead power lines that are 0-50,000 v for him or her safety suppose. High voltages above 50 Kv needs a bigger distance that 10 feet.
When current is flowing through a conductor, it produces an electric fields all around it. These fields spreads far from the conductor depending on the current flowing in it. When this fields are strong enough the can cause electrocution.
1000W * 4*60 s /( 3600 s/h) / (1000 W/kW)
= 1000*4*60/(3600*1000) kW-h
= 240/3600 kW-h
=1/15 kW-h
= 0.0667 kW-h (to 4 decimal places)
Answer:
Metal paper clips do not attract or repel each other. When an electromagnet is placed nearby, the paper clips can be observed to move toward it. Which statement describes this phenomenon?
- Magnetic domains within the paper clips align with the magnetic field.
An electromagnet is built using a 9-volt battery with conducting wire connected to a switch and coiled around an iron nail. A pile of metal paper clips is moved close to the iron nail, yet no attraction is apparent between the electromagnet and the paper clips. What is the most likely conclusion to explain this result?
- The switch is turned off.
An experiment modeled the interaction between magnetic force and the change of energy of an object influenced by the magnetic force. The experiment’s researchers observed that the metal wheels of a small car turned as they experienced the force exerted by a magnetic field, drawing the car closer to the magnet. What energy is being gained by the car?
- Kinetic Energy
Which statement about the current and magnetic field correctly describes this figure as well as all electromagnets?
- The current generates and is perpendicular to the magnetic field.
Domains are the regions in a material in which the magnetic fields of many of the atoms are aligned facing the same direction. What is the relationship between the electrical current and the alignment of atoms responding to the current?
- As current increases, the alignment becomes more organized.
Explanation:
I just took the test and got a 4-5. I went back to look at the one I got wrong and got the answer so here are all answers to this quick check. Use this as help, don't use it just to cheat!!