Answer:
A. Particle model.
Explanation:
The photoelectric effect describes when light shines on a piece of metal, and the metal releases electrons. The model of light behavior which best helps to explain this effect is the particle model. According to Isaac Newton, he postulated that light consists of little (tiny) particles which typically travels in a straight line and from his experimental investigation he observed that white light comprises of a mixture of colors.
Sir Newton observed that, when light shines on a piece of metal, the metal releases electrons because the energy of the tiny light particles are greater than the binding energy of the electrons residing in the metal. This theory is known as the particle model of light.
The two processes which produce nuclear changes are _____ and _____.
fizzing
fission
nucleation
fusion
Convert the following units into SI units without changing their values.
(a) 20281 g (b) 1.54 km (c) 5 minutes
Answer:
Convert the following units, into SI units without changing their values.
2.5 km
We know that
1 km=1000 m
So, for 2.5 km:
2.5 km=2.5×1000 m
=2500 m
Explanation:
like this you can solve all your question
[tex]hii[/tex]
have a nice day ✌️
Explain why a man using a parachute falls through air slowly while a stone falls through air very fast
You do an experiment to find out how much light is needed to make house plants grow taller. The two variables in this experiment are amount of light and the height of the plants. Which variable is the dependent variable and which is the independent variable? Explain your answer.
Answer: To grow strong seedlings, the light should be placed close to the tray, and raised as the plants grow taller. The Independent variable of this experiment is the light that enter the plant. The Dependent variable is the height of the plant.
Explanation:
Which is NOT true about forces?
A- All these things are true of forces.
B- They result from interactions
C- They have magnitude and direction
D- They come in pairs
E- They are a push or pull
Answer:
A
,
alll true
Explanation:
To what extent should the schools be responsible for teaching sex education? To what extent should sex education be left to parents? Who should handle education about STDs?
Answer:
I believe that the doctor or your parent should handle STDs talk because the doctor could tell you your risk of getting STDs or your parent could keep you safe and be prepare.They should be the one to tell you the important of being safe and protected not your PE teacher or anyone else. They will understand your choice but don't talk about your personal life with your teacher .Your parent are the best choice to talk to about STDs.
Explanation:
Plzzzz help due in a few
Answer: 5 = straight, constant
Answer: 6 = unbalanced, velocity
a car accelerates at a rate of 5.5 m/s2 and reaches a speed of 25 m/s in 4 seconds. What was the original speed of the car?
Speed = (rate of acceleration) x (time)
Accelerating at 5.5 m/s² for 4 seconds, the car gains (5.5 x 4) = 22 m/s of speed.
If it's actually traveling at 25 m/s at the end of that time, then it must have already been moving at (25 - 22) = 3 m/s when the 4 seconds started.
What is the average speed if an object travels 90 meters in 3 seconds?
Answer:
The answer is 30 m/sExplanation:
The average speed of an object can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time
We have
[tex]v = \frac{90}{3} \\ [/tex]
We have the final answer as
30 m/sHope this helps you
1. A car travels a distance of 100 km in 2 hours. What is the average speed of the car (km/h)?
Answer:
50 km/h
Explanation:
d = 100km
t = 2 hours
average speed = total distance/total time
= 100/2 = 50 km/h
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A person ran with a speed of 6 m/s onto the skateboard .What is the speed with which he ride on the skate board
Answer:
Let's define:
M = mass of the person
m = mass of the skateboard.
We can write the momentum as:
P = M*v
Remember the conservation of momentum, as we can not find any force in this situation (a highly idealized situation) the momentum will be conserved.
if P is the momentum before the person rides the skateboard, P' will be the momentum after the person rides the skateboard.
P = M*v
P' = (m + M)*v'
We must have:
P = P'
Now, we can assume that the mass of the skateboard is a lot smaller than the mass of the person, such that:
m << M
then we can assume:
(m +M) ≈ M
then:
P' = (M + m)*v' ≈ M*v'
And this is equal to P.
M*v' = M*v
Then we must have that:
v' = v
and we know that v = 6m/s
Then v' = 6m/s
The velocity after riding the skateboard will be equal to the velocity before riding it (in this model)
In a more scientific way, the velocity after riding the skateboard will be a bit smaller than the velocity before, and it will depend on the mass of the person and the mass of the skateboard.
A jet airliner moving initially at 366 mph (with respect to the ground) to the east moves into a region where the wind is blowing at 127 mph in a direction 60◦ north of east. What is the new speed of the aircraft with respect to the ground?
Answer:
The new speed is [tex]V_r = 443.4 \ m/s[/tex] , in the direction [tex]\theta = 14.36^o[/tex] with respect to the ground
Explanation:
From the question we are told that
The initial speed of the jet airliner is 366 mph to the east (positive x - axis )
The direction of the wind is [tex]u = 127 \ mps[/tex] toward 60° north west
Generally the x component of jet airliner velocity is
[tex]v_x = 366 * cos (0) = 366 \ mph[/tex]
Generally the y component of jet airliner velocity is
[tex]v_y = 366 * sin (0) = 0 \ mph[/tex]
Generally the x component of winds velocity is
[tex]u_x = 127 cos(60) = 63.5 \ m/s[/tex]
Generally the y component of winds velocity is
[tex]u_x = 127 sin(60) = 109.99 \ m/s[/tex]
Generally the velocity of both the jet airliner and wind along the x-axis is
[tex]V_x = v_x + u_x = 366 + 63.5 = 429.5 \ m/s[/tex]
Generally the velocity of both the jet airliner and wind along the y-axis is
[tex]V_y = v_y + u_y = 0 + 109.99 = 109.99 \ m/s[/tex]
Generally the resultant velocity is
[tex]V_r = \sqrt{V_x^2 + V_y^2}[/tex]
=> [tex]V_r = \sqrt{429.5^2 + 109.99^2}[/tex]
=> [tex]V_r = 443.4 \ m/s[/tex]
The direction is
[tex]\theta = tan^{-1} [\frac{V_y}{V_x}][/tex]
=> [tex]\theta = tan ^{-1}[\frac{109.99}{429.5}][/tex]
=> [tex]\theta = 14.36^o[/tex]
A chicken runs across the street at a speed of 12 m/s. If the road is 36 meters across, how long does it take for the chicken to cross the road?
Answer:
3
Explanation:
Its not that hard....
If a chicken runs across the street at a speed of 12 m/s, and the road is 36 meters across, then the chicken takes 3 seconds to cross the road.
What is speed?Speed is the rate at which an object covers distance. It is the measure of how fast or slow an object is moving relative to a particular reference point.
Speed is usually expressed in units of distance per unit time, such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).
For example, if a car travels a distance of 100 kilometers in 2 hours, then its speed would be:
Speed = Distance / Time = 100 km / 2 hours = 50 km/h
This means that the car is covering a distance of 50 kilometers every hour.
Here in the Question,
To calculate the time it takes for the chicken to cross the road, we can use the formula:
time = distance/speed
where distance is the width of the road, and speed is the velocity of the chicken.
Substituting the given values, we get:
time = 36 meters / 12 m/s
time = 3 seconds
Therefore, it takes the chicken 3 seconds to cross the road.
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describe the industrial application of crystalization
Answer:
Crystallization is one of the most widely used technologies in chemical industry, and process robustness governs process productivity and economics. In particular, the pharmaceutical and food sectors are utilizing crystallization for optimized separation, purification, and solid form selection.
Q5) You drive a car at 40mph a distance of 5 miles to school. How many seconds does it take
you?
How are amplitude modulation and frequency modulation techniques similar?
O Both are used by cell phones to produce images.
O Both transform electrical signals into sound waves.
O Both modify the pulse of a carrier wave.
O Both are used by radio stations to transmit sound.
Answer:
D. Both are used by radio stations to transmit sound.
Explanation:
An object with a mass of 25 kg is on a free fall from a plane.
a. Calculate the force attracting it to the Earth. Would this force be different in Mars?
Gravitational field strength: 10 N/kg
Answer:
a) F = 250 [N]
Explanation:
Force can be calculated by means of Newton's second law, which tells us that force is the product of mass by acceleration.
a)
F = m*a
where:
F = force [N]
m = mass = 25[kg]
a = gravity acceleration = 10 [m/s²]
F = 25*10 = 250 [N]
Yes, this force would be different on Mars, since the gravitational acceleration of Mars is different from that of Earth.
gm = Martian gravity = 3.72 [m/s²]
Fm = 3.72*25 = 93 [N]
6.0 C when the current is 0.5 A
Explanation:
??? i don't really see a question here......
If a person is walking at 4 m/s, how far can he travel in 30 seconds
Answer:
120 m
Explanation:
If the amount a spring is stretched doubles, the elastic potential
energy stored will ...
A: halve
B: stay the same
C: double
D: quadruple
PLEASE HELP ASAP!!! WILL GIVE BRAINLIEST!!! (hint: please help with all five questions and not just one) THANK YOU FOR HELPING!!! I GREATLY APPRECIATE IT!!!
On the first part of a journey, a motor cyclists travels for 33 hours at an average speed of 60km per hour.On the second part of a journey, the same motor cyclists travels for 600 minutes at an average speed of 50km per hour.How far does the motor cyclists travel in total
Answer:
2480km
Explanation:
If two objects crash into each other, what happens? Are both objects affected? How? If you can, give an example to support your ideas.
If two objects crash into each other, they experience collision and both bodies are affected.
Two bodies are said to collide if they hit or crash into each other.
Hence when two objects crash into each other;
collision occursThere is a release of energy due to this collisionOne of the objects tends to gain momentum or speed while the other object loses momentum.For example, two rolling objects going in opposite directions when they hit each other tens to experience a collision.
Hence we can conclude that if two objects crash into each other, they experience collision and both bodies are affected.
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The current in secondary of coil of a transformer is 1 A and that in primary is 0.5 A. If 200V is available in the secondary what is the voltage in the primary?
Answer:
400 V
Explanation:
The following data were obtained from the question:
Current in secondary coil (Iₛ) = 1 A
Current in primary coil (Iₚ) = 0.5 A
Emf in secondary coil (Eₛ) = 200 V
Emf in primary coil (Eₚ) =.?
The voltage (i.e emf) in the primary coil can be obtained as illustrated below:
Eₛ / Eₚ = Iₚ / Iₛ
200/Eₚ = 0.5/1
Cross multiply
Eₚ × 0.5 = 200 × 1
Eₚ × 0.5 = 200
Divide both side by 0.5
Eₚ = 200/0.5
Eₚ = 400 V
Therefore, the voltage in the primary coil is 400 V
Frank Schuman, an American inventor, designed a way to use concentrated sunlight to create steam to drive a turbine to generate electricity in 1910. It did not get accepted in the US, because cheap __________ was being burned to make the steam
Answer:
coal
Explanation:
Frank Schuman's solar power invention to create steam that will drive the turbine to generate electricity was not accepted in the United State back then because coal, a non-renewable energy source, was available for cheap and can easily be burned to generate steam.
Since the coal was readily available for cheap and back then, the deposit was huge to the extent that no one was thinking that it could get exhausted one day or the environmental pollution created through its burning, the invention of Schuman did not get the desired attention.
\in what way are the longitudinal waves formed on the spring coils similar to the sound waves in air?
Answer:
The spring coils and the air participles both move in the same direction as the wave travel
If John walks around the block, what distance does he travel?
Answer:
hmm do you now how to divide
or no
Explanation:
9
Fill in the blanks with CONDUCTION, CONVECTION, RADIATION:
is the transfer of energy through direct contact.
is the transfer of energy
through waves
radiation
is the transfer of energy through a medium such as a liquid or a gas.
Answer:radiation is the transfer energy thru heat waves, conduction is direct contact, and convection is through liquid
Explanation:ik this
efficient than simple
Compound machines are generally
machines.
Answer:what?????
Explanation:hhisb
A ball dropped from rest falls freely until it hits the ground with a speed of 18 meters per second. How long did it take for the ball to reach the ground?
Answer:
1.8 secs
Explanation:
u= 0
v= 18m/s^2
t= ?
v= u +at
18= 0 + 10×t
18= 10t
t= 18/10
t= 1.8 secs
Hence it will take the ball 1.8 secs to reach the ground