Answer:
Newton's second Law of motion
Which magnets need electric current for magnetism?
a. Bar magnets b. Temporary magnets c. Permanent magnets magnets
Temporary magnets require electric current to produce magnetism and magnetic field lines B) Temporary magnets
In electromagnets, their magnetism is dependent on electricity with an iron core in the center. If we add an iron core to a solenoid, we can increase its magnetic field strength . When we connect a battery to a solenoid and wrap the sanded copper wire around a nail, a magnetic field is created. This force is generated by the magnetic field that's created when current flows through the coil.
As long as there is a direct current running through the coil, the nail will retain its magnetic properties. However, once the current stops, the magnetism of the nail is lost . Creating electromagnets can be achieved by winding wire around the iron core.
The advantages of electromagnets are :
Electromagnets can be turned on and off magnetic Fields can be increased and decreased Electromagnets can be cheap compared to permanent magnets. The same cannot be said for a permanent magnet.To learn more about Magnets
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What is the momentum of a 750 kg car traveling at a velocity of 25 m/s north?
Answer:
18750 kg-m/s
Explanation:
Momentum = mass x velocity
Answer:
18750 kg-m/s
Explanation: Momentum = mass x velocity 750x25 = 18750 kg-m/s
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The box in the right diagram takes 1.1 sec to strike the floor after being released from rest. Find the landing speed of the 0.3-kg box, the tension of the rope, and moment of inertia of the pulley.
Answer:
dhrh4b
Explanation:
hours rbergrehebbeb3j3
photo attached: please help!!!
Answer:
The center of mass changes
Explanation:
The higher the center of mass the more likely things are to topple over but the lower it is the more likely to stay put when all 4 wheels are down .
Your student desk has been in the room for many hours, it is at thermal equilibrium with the room?
Which part of your desk is colder: the wood or the metal? Why?
Answer:
metal because A: In general, metals feel colder or hotter to the touch than other materials at the same temperature because they're good thermal conductors. This means they easily transfer heat to colder objects or absorb heat from warmer objects. Thermal insulators like plastic and wood don't transfer heat as easily.
Explanation:
What type of element is hydrogen?
Answer:
Hydrogen (H), a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements.
Explanation:
Answer:
It is a chemical element
Explanation:
What is the frequency of a raido wave with a wavelength of 1.0 mm?
Answer:
3×10^6
Explanation:
frequency is the speed of light ( c) which is a constant number divided the wavelength
f = 3×10^6 / 1.0
What force is necessary to give a 1000 kg rocket an acceleration of 150
m/s2?
Answer:
150,000N
Explanation:
Force=Mass*Acceleration
F=ma
Mass of the rocket=1000Kg
Acceleration=150 m/s²
Force=1000*150=150,000kgm/s²=150,000N
8. Where does ½ to ⅓ of the ocean pollution come from?
Answer:
The majority of pollutants that make their way into the ocean come from human activities along the coastlines and far inland. One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff.
I’m a god, a planet, and I measure heat. What am I?
mercury??????? my only guess
Mercury is that it?
What must be your average speed in order to travel 350 km in 5.15 h? *
66.0 km/h
67.0 km/h
68.0 km/h
69.0 km/h
HELP ME PLEASEE!!!THIS IS SCIENCE
Answer:
B.
Explanation:
Which has greater density- 1 kg of water or 10kg of water?
Answer:
I believe that it will be 10kg of water
Explanation:
Because a measure of the amount of information on a storage medium (tape or disk). For magnetic tape it is the amount of information recorded per unit length of tape (bits per inch or millimeter); for a disk, a fixed number of bits per sector, sectors per track, and tracks per disk.
The density in both the case will be equal, just the difference will be in the volume they occupy.
What is density?In practice, density is the weight of a substance per unit volume. Water has a density of about 1 gram per milliliter, but this varies depending on temperature and whether or not substances are dissolved in it. Because ice is less dense than liquid water, it floats in your glass.
This allows many aquatic organisms to survive the winter. If ice were more dense than water, it would continue to freeze and sink until the entire lake was frozen.
Any amount of water has the same density. Whereas one gram of water has a volume of one milliliter, ten grams have a volume of ten milliliters.
Thus, the density will be same.
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briefly explain transport of oxygen by blood
Answer:
Once oxygen has entered the blood from the lungs, it is taken up by haemoglobin (Hb) in the red blood cells. ... Each molecule of haemoglobin can hold four oxygen molecules. It is haemoglobin that carries the oxygen as it is transported around the body in the blood.
Explanation:
What happens as a bungee jumper gets closer to Earth's surface?
A. Gravity decreases
B. His mass increases
C. Air resistance decreases
D. His velocity increases
Answer:
Velocity increases
Explanation:
Gravity is constant, except when discussing "apparent weight"
Mass is constant here
Air resistance would actually increase
Velocity DOES increase, because Earth is pulling the jumper downwards with an unbalanced force. The unbalanced force creates acceleration (-9.81 m/s^2), which means his velocity is increasing constantly.
what is reflection of light ? Which type of surface is required for a regular reflection
Answer:
MIRROR
Explanation:
Answer:
reflection of light is the bouncing back of light rats when it falls on a smooth surface or polish surface.
A 780 kg vehicle accelerates at 4 m/s2. How much force is the car generating?
Explanation:
Given
mass (m) = 780 kg
acceleration (a) = 4 m/s²
Force (F) = ?
We know
F = m * a
= 780 * 4
= 3120 Newton
The car is generating 3120 Newton force.
Hope it helps :)
ASAP! AWARDING BRAINLIEST see attached photo.
Answer:d
Explanation:
Answer:
I believe the answer would be B
Hey guys I really need help can you please come and help me on struggling please help I choose one but that could be wrong
Answer:
It's solar because if you leave a tv on for longer it gets hot and obviously it produces light and sound so, by subject of elimination, it's solar.
Explanation:
Answer:
I think solar because the thermal and sound and light are like a part of the tv (sorry for my English)
What special component would you need to use in a thermostat so that it can respond to changes in temperature
Answer:
A thermistor is an electrical device, a thermally sensitive semiconductor resistor, whose resistance changes in response to temperature. Thermistors are made in a variety of ways including thin films (SiC).
Explanation:
hope it helps
Which type of electromagnetic waves should the scientists' cameras use in order to safely capture images of the sea turtles at night?
A
infra-red
B
micro
С
ultra-violet
D
visible spectrum
Answer:
D :} if not that is A that what my thing say where correct
Explanation:
Answer:
A.) infra-red
Explanation:
Hey guys I need help please help me what do y’all think it is I need help And I’m struggling
An object in motion stays ___ at a constant ___ and in a straight line.
a. in motion, acceleration
b. in motion, speed
c. at rest, speed
Answer:
Answer is A
Explanation:
the answer is A
What is the most accurate way to check your heart rate (bpm)? Help me?
Answer:
Count your pulse for 60 seconds.
Explanation:
This isn't physics, this quesiton should be marked in health.
Your personal hygiene is more important to avoid you becoming ill, more so than spreading germs.
True
False
Clothes in a dryer rub together and begin clinging to each other
A. Friction
B. Conduction
C. Induction
Answer:
Conduction
Explanation:
Because they touch lol
Answer:
Conduction
Explanation:
Because induction is the pass of electricity without contact and conduction is the complete opposite
When people place a metal saucepan on the heating element of a stove, heat is transferred from the element to the saucepan by: A reflection.
B convection.
C conduction.
D radiation.
A dog exerts a force of 30N to move a wagon 2m in 5s. What is the power of the dog?
help me
Answer:
i do not know
Explanation:
im doing for education too
Answer:
I don't know too . want to help but I don't know how .
Explanation:
sorry bro . I want to have points eeek . :/
Pls help it’s dues today
Sam studied kinetic and potential energy by observing apples on a tree during a field investigation. Explain what type of energy these apples have.
Answer: Gravitational Potential Energy
Explanation:
physics help pleaseee
Answer:
the first questions answer is- the pressure is the same (balanced) outside and inside the window.
the second questions answer is- the atmospheric pressure increases.
Explanation:
I hope that this is what you were looking for.