Answer:
Energy is neither created nor destroyed.
Explanation:
explain why at the atomic level, conductors move charge easily and insulators do not
Hich type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? gamma rays visible light infrared light microwaves
Answer:
gamma rays
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Gamma rays is a type of electromagnetic waves that are dangerous enough to be used to kill cancerous cells.
In the electromagnetic spectrum, gamma rays are known to have the greatest amount of energy and shortest wavelength among the wave particles. They are generally produced through the disintegration of radioactive elements.
Answer:
A. Gamma rays
Explanation:
Proof:
A car with a mass of 880 kg is moving on the road with constant velocity. The force exerted by engine is 1600N. What is the frictional force between the road an the car?
Answer:
1600 N
Explanation:
F-F' = ma.................. Equation 1
Where F = Force exerted by the engine, F' = Frictional Force, m = mass of the car, a = acceleration of the car.
make F' the subject of the equation
F' = F-ma............... Equation 2
Given: F = 1600 N, m = 880 kg, a = 0 m/s (moving with a constant velocity).
Substitite these values into equation 2
F' = 1600+880(0)
F' = 1600 N.
Which actions would INCREASE the potential energy of a cup
placed on a kitchen counter? Choose all of the correct
answer(s). Oh
Answer: Fill the cup with water
Add a handle to the cup
Lift the cup over the counter.
Explanation:
The options given are:
- Slide the cup away from the edge
- Fill the cup with water
- Turn the cup upside down
- Add a handle to the cup
- Move the cup to the floor
- Lift the cup over the counter
Potential energy refers to the energy that's being stored in a particular object. The formula for potential energy is given as:
PE = mgh
where,
m = mass
g = gravitational field.
h = height
The actions that'll increase the potential energy of the cup that's placed on the kitchen counter will be:
1. Fill the cup with water - This increases the weight of the cup.
2. Add a handle to the cup - The mass is increased as well.
3. Lift the cup over the counter - The height is increased.
Why was Roemer's measurement of the speed of light inaccurate?
a) because man's reaction time was much slower than the speed of light
b) because the eclipses of Jupiter's were not regular enough
c) he did not know the accurate diameter of the Earth's orbit
17)
A positively charged ion will bond with
A)
a negatively charged ion.
Elin
B)
a neutral atom.
C)
another positively charged ion.
D)
nothing else.
Answer:
Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... the complete transfer of valence electron(s) between atoms. It is ... The compound is neutral overall, but consists of positively charged ions called cations and negatively ... an ion with net negative charge, having more electrons than protons.
Explanation:
speed of light in air is 3 x 10 m/s, determine the speed of light in the glass fibre.
Write a hypothesis about the effect of increasing resistance on the current in the circuit. Use the "if . . . then . . . because . . ." format and be sure to answer the lesson question: "How do changes in voltage or resistance affect current in an electric circuit?"
Sample Response: If resistance in a circuit is increased under constant voltage, then current must decrease because Ohm's law states that resistance and current are inversely proportional.
edge 2021
Answer:
If resistance in a circuit is increased under constant voltage, then current must decrease because Ohm's law states that resistance and current are inversely proportional.
Explanation:
edge 2021
A car is traveling at 120 kilometers per hour with 35,000 joules of kinetic energy on the freeway when it suddenly applies its brakes and comes to a screeching stop. How much of the original 35,000 joules of energy is left?
Answer:
0 J is left (No amount of the original 35000 J energy is left)
Explanation:
From the question
Kinetic Energy (K.E) = 1/2mv²................... Equation 1
Where m = mass of the car, v = velocity of the car.
make m the subject of the equation.
m = 2K.E/v²..................... Equation 2
Given: K.E = 35000 Joules, v = 120 km/h = (120×3600/1000) = 432 m/s
Substitute these values into equation 2
m = (2×35000)/432²
m = 0.375 kg.
If a brake is suddenly apply,
Then, the velocity of the car = 0 m/s.
Therefore,
K.E = 1/2(0.375×0²)
K.E = 0 J.
From the baove analysis, No amount of the original 35000 J energy is left.
(show your work)
What is the net force on the box shown below?
30 N
60 N
20 N
30
60 20
< Square >
Answer:
I don't do physics , I'm sorry can't help you
What types of evidence are used to support The Big Bang theory?
Answer:
Hubble's Discovery
cosmic microwave background radiation
Answer:
Three main pieces of evidence for the Big Bang theory are the red-shift of light, cosmic background radiation and types of elements.
Explanation:
Two major scientific discoveries provide strong support for the Big Bang theory: • Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.
What are the units of radiation?
The radiation dose absorbed by a person is measured using the conventional unit rad or the SI unit gray. The biological risk of exposure to radiation is measured using the conventional unit rem or the SI unit sievert.
I hope this helps!
Read the map key. Predict which location would expect to have the most extremes in average annual temperatures.
A.
B.
C.
D.
Answer:
D is the answer
Explanation:
if you push a small act with 7,000 N force and push a heavy truck with the same force, which one will have a greater acceleration?
Answer:
the small one will have greater acceleration
Explanation:
force and mass are inversely proportional. force and acceleration are directly proportional. which means greater mass have smaller acceleration and smaller mass has greater acceleration. this is due to newtons second law of motion.
The small object will have greater acceleration as compared to a heavy truck if we push with the same amount of force, i.e., 7000 N.
What is acceleration?Acceleration is proportional to change in velocity.
When there will be a change in velocity with time, that is called acceleration.
[tex]\vec{a}[/tex]=[tex]\vec{dv}/dt[/tex] where,
[tex]\vec{a}[/tex] is the acceleration,
[tex]\vec{dv}[/tex] is the change in velocity and,
dt is change in time.
It is a vector quantity.
SI unit of acceleration is [tex]m/s^{2}[/tex].
There are several types of acceleration :
Uniform acceleration Non-Uniform accelerationInstantaneous acceleration.As we know that acceleration depends on the change in velocity and velocity of a body depends on the mass of the body. So if the body has less mass it must have a higher velocity and if it has a higher velocity than it has greater acceleration.
Hence, the small object/body has greater acceleration as compared to a heavy truck.
For more information about Acceleration :
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1.
If a force of 40N is applied for 0.2 sec
to change the momentum of a
volleyball, what is the impulse?
Answer:
J = 8 kg-s
Explanation:
Given that,
Force, F = 40 N
Time, t = 0.2 s
We need to find the impulse. We know that,
Impulse, J = F×t
So,
J = 40 × 0.2
J = 8 kg-s
So, the impulse is 8 kg-s.
What is the average?
Answer:
Explanation:you knoe i know
What is the average velocity of the particle from rest to 9 seconds?
1 meter/second
B.
2 meters/second
C.
3 meters/second
D.
4 meters/second
Can someone please help me with science
How much force is needed to keep the bowling ball moving towards the pins once it has
left the man's hand?
Please help me!
Answer:
Explanation:
The amount of force needed needs to be greater than all the forces acting in the opposite direction that the bowling ball was thrown. This includes air resistance, floor friction, gravity, and any other force involved. As long as the force acting on the bowling ball that is causing it to go in the direction of the pins is slightly greater than the opposite acting forces then it will continue in that direction. Since no values are provided we cannot calculate the actual precise value of force needed.
Yo can someone help this question is for 20 points : P pls solve
Answer:
10 points u liar so i wont answer
Explanation:
explain in 2-3 sentences how a genotype determines a phenotype!
Will give b to the best one
Answer:
Genotypes are determined by tests. Genotype and phenotype sound the same but mean different things. The phenotype is determined by your genotypes and by your genes or traits, like hair color or type, eye shape and color, body and height. Were all unique, even identical twins, based on the way they look or act. Your uniqueness is based on your genetic make-up, that we inherited from our parents.
Is this better?
Brainliest please!
If the needle in the galvanometer is going up, what can you conclude about the motion of the magnet in the diagram?
It is not moving.
It must be moving left.
It must be moving right.
It is being moved in an unknown direction.
If the needle in the galvanometer is going up, the conclusion about the motion of the magnet is it must be moving right.
What is galvanometer?The galvanometer is the device used to detect the small current when moving coil is deflected.
When the magnet is moved towards or into the coil of wire, the magnetic field will change and voltage will be generated into the coil. The coil must be moving to the right when galvanometer going up.
Thus, the conclusion about the motion of the magnet is, it must be moving to the right.
Learn more about galvanometer.
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Whats the answer to 10a² - 6ab + 10 -2a² - 4ab +15b?
when people walked on the moon, they found that they could jump higher than theu could back on earth. why is this true?
Answer:
There is less gravity on the moon
hope this helps
have a good day :)
Explanation:
Mark the correct statement: a) Charges flow through a circuit b) voltage is applied across the circuit c) voltage is the ratio of energy per coulomb of charge d) All of the above e) none of the above
Answer:
The correct option is;
d) All of the above
Explanation:
a) In an electric circuit through which electric current flows, it is due to the electric charges which can be the negatively charged electrons or the positively charged protons
b) Voltage is the potential difference that results in current flowing through the circuit, therefore, the voltage is applied across the circuit through which current flows
c) The voltage which is the electric potential difference is the change in potential energy in joules of a given system due to the movement of a test charge (in Coulombs) between points in the electric field, ΔE, divided by the value of the test charge, 'q'
V = ΔE/q
Therefore, all of the above are correct.
Dos automóviles A y B que inicialmente están separados una distancia de 5 km inician su movimiento simultáneamente con velocidades de 80km/h y 60km/h. Si salen a las2pm. A. ¿A qué hora se producirá el encuentro? B. ¿A qué distancia del punto P se producirá el encuentro?
Answer:
A) t = 900 s, the meeting time is 2 h 15 min p.m, B) x = 15000 m
Explanation:
A) This is an exercise in kinematics, we must assume that car A is behind so that it can catch up with the slower car B.
car A
x = x₀ₐ + v₀ₐ t
car B
x = x_{ob} + v_{oB} t
in this case x₀ₐ = 5 km and the initial position. B is zero
at the bare point the position of the two vile cars is the same.
x₀ₐ + v₀ₐ t = v_{ob) t
x₀ₐ = (v_{ob} - v₀ₐ) t
t = [tex]\frac{x_{oa}}{v_{ob} - v_{oa} }[/tex]
let's reduce the magnitudes to the SI system
x₀ₐ = - 5 km (1000m / 1 km) = -5000 m
v₀ₐ = 80 km / h (1000 m / 1km) (1 h / 3600 s) = 22.22 m / s
v_{ob} = 60 km / h (1000 m / 1 km) (1 h / 3600s) = 16,667 m / s
let's calculate
t = [tex]- \frac{5000}{16.667 - 22.222}[/tex]
t = 900 s
let's reduce to minutes
t = 900 s (1 min / 60 s) = 15 min
Therefore, the meeting time is 2 h 15 min p.m.
B) at what point are they
x = v_{ob} t
x = 16,667 900
x = 15000 m
You are allowed to change the number of molecules of each substance by adding coefficients in front of the formulas.
True
False
Answer:
This is false.
Explanation:
No; you cannot change the formulas of individual substances because the chemical formula for a given substance is characteristic of that substance. What you can do, however, is to change the number of molecules that react or are produced.
A projectile thrown up ward moves in its parabolic path at what point..
Answer:
please give me brainlist and follow
Explanation:
As the projectile moves upward, its vertical component of velocity decreases due to gravity. While the horizontal component remains the same as there is no acceleration in the horizontal direction. At maximum height vertical component of velocity is zero.
Ignoring air resistance, an object thrown in any direction moves in a parabolic path from the time it leaves the thrower's hand until the time it hits the ground or a physical obstruction.
Which best describes the effect of force on the motion of an object
Answer:
change of speed or direction
What are 3 procedures of making a cardboard spinner help!! I need help ASAP
Answer:
please give me brainlist and follow
Explanation:
How to Make Paper Spinners
Step 1: Materials. All you really need is a normal sheet of paper. ...
Step 2: Fold Paper in Half. ...
Step 3: Tear/Cut Along the Fold. ...
Step 4: Fold the Half Sheets. ...
Step 5: Fold Down the Corners of Each Piece. ...
Step 6: Attach the Two Pieces to Create the Spinner. ...
Step 7: Shape Spinner for Best Spinning Abilities. ...
Step 8: Customize.
