Answer:
The correct answer is - Disagree with her.
Explanation:
Fluorescence substances are the substances that glow when they absorbed visible light and ultraviolet radiation and objects will glow when put under Ultraviolet light and makes the molecules excited.
Microwaves have a different wavelength than ultraviolet radiation and therefore does not able to excite the molecule of the fluorescent objects. The microwave radiation will not glow.
Thus, the correct answer is - disagree with her.
What is the gravitational force on a 70.0kg object that is 3.18x106m above the earth’s surface?
Answer:
3' Circle the object that would exert a greater force of gravity on you. ... What is the gravitational force on a 70.0kg object sitting on the earth's surface? 8. What is ... What is the gravitational foroe on a 70.0kg object that is 3.18x106m above the.
:p
A spring with a spring constant of 400 n / M has a mass hung on it so it stretches 8 cm. calculate how much mass the spring is supporting.
Answer:
3.3kg
Explanation:
Given parameters:
Spring constant = 400N/m
Extension = 8cm = 0.08m
Unknown:
Amount of mass the spring is supporting = ?
Solution:
To solve this problem:
F = kE
F is the force
k is the spring constant
E is the extension
So;
F = 400 x 0.08 = 32N
Mass;
Force = mass x acceleration due to gravity
32 = mass x 9.8
Mass = 3.3kg
The mass the spring is supporting is 3.27 Kg.
We'll begin by calculating the force acting on the spring.
Spring constant (K) = 400 N/mExtension (e) = 8cm = 8 / 100 = 0.08 mForce (F) =?F = Ke
F = 400 × 0.08
F = 32 N
Finally, we shall determine the mass. This can be obtained as follow:
Force (F) = 32 NAcceleration due to gravity (g) = 9.8 m/s²Mass (m) =?m = F / g
m = 32 / 9.8
m = 3.27 Kg
Therefore, the mass the spring is supporting is 3.27 Kg
Learn more about spring constant:
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Kundan who weighs 200N and bijaya who weighs 500N are playing sea saw.If Bijaya is 1m away from the fulcrum,how far should kundan sit to lift bijaya
Answer:
Kundan should sit at more that 2.5 meters from the location of the fulcrum on the side opposite to the side where Bijaya sits
Explanation:
The given parameters are;
The weight of Kundan, F₁ = 200 N
The weight of Bijaya, F₂ = 500 N
The distance of Bijaya from the fulcrum, d₂ = 1 m
Therefore, for Kundan to lift Bijaya, Kundan should sit at a location further than the point where both the moment of Bijaya and Kundan about the fulcrum are equal
Moment of a force, M = The magnitude of the force, F × The perpendicular distance to the point at which the force acts, d
At equilibrium, the sum of the clockwise moment = The sum of the anticlockwise moment
Taking the moment of Kundan as being in the anticlockwise direction and the moment of Bijaya as acting in the clockwise direction, we have;
F₁ × d₁ = F₂ × d₂
∴ 200 N × d₁ = 500 N × 1 m
d₁ = 500 N·m/(200 N) = 2.5 m
Therefore, when Kundan sits at the point d₁ = 2.5 m, away from the fulcrum on one side of the sea saw and Bijaya sits at the point 1 m from the fulcrum on the other side of the sea saw, both Kundan and Bijaya will have the same moment
For Kundan to lift Bijaya, therefore, Kundan as to sit at a point further than 2.5 m from the fulcrum on the opposite side of the fulcrum from Bijaya.
What was the average speed of the student from 0 to 5 seconds?
Answer:
10 average speed seconds
Daniel rode his bike 35km in 6 hours. What was his speed?
9. Luke is an astronaut that moves his position in the space shuttle by climbing a
3.0 m ladder in 5.0 seconds at Cape Kennedy (g = 9.8 m/s^2). After landing on the
moon (g = 1.6 m/s^2), Luke climbs a 3.0 m ladder in 5.0 seconds to begin the trip back to Earth. Is more power expended by the astronaut on Earth or on the moon, and by what factor?
Explanation:
Remember that power is defined as how much Work is done per unit of time.
[tex]P = \frac{dW}{dt}[/tex]
Work is defined as the amount of force applied across a certain distance.
[tex]W = F*d[/tex]
Since in both cases of climbing the ladder (on Earth and the moon), Luke coveres the same amount of distance in the same amount of time, we are only left with one difference between the two cases - gravity.
If you were to carry your backpack on the moon with the same load of text books, it would take less force to pick it up on the moon. Therefore, Luke expends less effort on the environment with less gravity - the moon.
To find the difference factor - you would want to divid the gravitational contants between earth and the moon.
Answer:
It takes 6.125 times as much work on Earth as it does on the moon.
Explanation:
Formulas
The power formula is
P = Work / Time
Work = Force * distance
Givens
d = 3.0 meters
t = 5.0 seconds
g = 9.8 m/s^2 on earth
g = 1.8 m/s^2 on the moon
Solution
Earth
Work = F * d
Work = m* a * 3.0 m
Work = m *9.8 * 3.0
Work = m * 29.4
Power = (Work * 29.4)/5
Power = 29.4/5 * m
Power = 5.88 watts.
Moon
You follow the same procedure except you use 1.6 for a.
Work = m * 1.6 * 3
Work = 4.8*m Joules
Power = 4.8 * m/ 5
Power = 0.96 * m Watts
P_earth/Power_moon = 5.88 * m / 0.96 * m = 6.125
Power =
A flowing stream contains water that is 18 degrees Celsius. Cans of soft drinks at 28 degrees Celsius are lowered into the stream. Which of the following will most likely occur?
a The soft drinks will absorb cold energy from the stream's water.
b The soft drinks will not change temperature since they are sealed.
c The cans will cool until they are the same temperature as the stream.
d The temperature of the cans will decrease to freezing as long as the stream is flowing.
Answer:
Explanation:
c
Guys I need help I will make brainliest!!
Comes with no word bank btw
Answer:
When an object applies a force on another object, the second object applies a force of the SAME amount/magnitude on the first object, but the force is in the opposite direction.
PLS HELP! A boy drops a ball from an observation tower. The ball hits the ground in 3.0 s. What is the ball's velocity at the time of impact?
Answer:
v = u + at
v = 0 + 9.8 × 3
v = 29.4 m/sec
Answer: 29.4 m/s
Explanation:
We find the answer by using this equation:
v2 = v1 + a * t
Let's figure out what our variables are.
v2 = ?
We don't know the final velocity, so this variable is blank
v1 = 0
In a free fall, the velocity is 0
a = 9.8 m/s
Acceleration in a free-fall is 9.8 m/s
t = 3
It took 3 seconds for the ball to hit the ground
Now we plug our values.
v2 = v1 + a * t
v2 = 0 + 9.8 * 3
v2 = 0 + 29.4
v2 = 29.4
Hope this helps! :)
On a sunny day, a student poured a cup of water on the sidewalk to make a puddle. When he returned later, the puddle was gone. The student concluded that the puddle was gone because the water soaked into the sidewalk. 1. What would you say to this student about this conclusion? 2. What could you do to demonstrate your idea about where the water went? Text EntryMedia Copy and paste or type your submission right here.
Answer:
The students conclusion is wrong.
Explanation:
The students conclusion is wrong because liquids can not soak into concrete. The water evaporated because it was a hot sunny day. The water turned into a gas called water vapor.
please help! major part of my grade..
Answer:
A.
Explanation:
It will stay in motion unless for example, someone stops it from going.
Answer:
yes the answer should be a
What happens when electromagnetic waves cause a disturbance in electric and magnetic fields?
A. Any particles in the fields move with them.
B. They cancel vibrations in electric and magnetic fields.
C. The electromagnetic waves transfer energy.
D. The fields line up parallel to each other.
Answer:
The answer is C. The electromagnetic waves transfer energy.
The electromagnetic waves cause a disturbance in the electric and magnetic field as the electromagnetic waves transfer energy. Thus, the correct option is C.
What are electromagnetic waves?The electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field. These waves propagate through space and carry momentum and electromagnetic radiant energy as well. It includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All of these waves form together different parts of the electromagnetic spectrum.
Electromagnetic waves or the EM waves are waves which are created as a result of vibrations between an electric field and a magnetic field. Electromagnetic waves are composed of oscillating magnetic and electric field lines and transmit energy.
Therefore, the correct option is C.
Learn more about Electromagnetic waves here:
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If the man has an initial velocity of 0.4 m/s with a time of 5.8 seconds and an experimental displacement of 8.167 meters and acceleration of 0.343 m/s^2, what is his calculated displacement?
Group of answer choices
7.98 m
7.62 m
8.99 m
8.09 m
Answer:
8.09
Explanation:
Use: s = ut + 1/2at^2
s = displacement
u = initial velocity
a = acceleration
t = time
Plug in numbers and get: 8.09
Can y’all help me with these two please, thank you
Explanation:
Question 4
Force is represented using letter F
the force formula f = ma
Question 5
mass = 0.43kg
acceleration = 49.4m/s²
Force = ?
Remember that force F = ma
Now substitute, F = 0.43 × 49.4 = 21.2N
Raul is riding on a train that is moving at a speed of 20.0 meters per second. Kirstin is sitting across from him, and there is a distance of 1.8 meters between them. If Raul and Kirstin do not leave their seats, which of the following graphs shows the distance from Raul to Kirstin over the first 6 seconds of the trip?
Answer:
C
Explanation: Study Island
Answer:
The Straight Line Graph
Explanation:
Which detail in the first text do you better understand because of the details in the second text?
“Tourette syndrome”
“experienced bullying”
“mantra”
“worldwide audience”
Answer:
tourette syndrom
Explanation:
in the 2nd they go into detail about tourette syndrome and in the 2nd they dont talk about any of the other options
Answer:
A
Explanation:
I did it in edge and got 100
PLZ HELP WILL GIVE BRAINLIEST
What role did pressure play in the formation of the clouds?
Answer:
Air can't hold as much water when air pressure drops. The vapor becomes small water droplets or ice crystals and a cloud is formed.
Explanation:
a light wave travels from air into a medium of refractive index 1.54. If the wavelength of the light in air is 5.4 * 10^-7. calculate its wavelength in the medium
3.51 × 10^-7m
Explanation:
Refractive index = wavelength of the light in air ÷ wavelength in the medium
wavelength in the medium = wavelength of the light in air ÷ refractive index
= 5.4 * 10^-7 ÷ 1.54
= 3.51 × 10^-7m
Calculate the efficiency of a hair dryer which takes in 4500J of energy per second and transfers 150J as useful heat energy.
Answer:
η = 0.0333 = 3.33 %
Explanation:
The efficiency of any device is defined as the ratio of the useful output obtained from that device to the input required by the device. Therefore, the general formula to find the efficiency of any device is given as follows:
[tex]\eta = \frac{O}{I}[/tex]
where,
η = efficiency of hair dryer = ?
O = Useful Output Given by the Hair Dryer = 150 J
I = Input Energy Required by the Hair Dryer = 4500 J
Therefore,
[tex]\eta = \frac{150\ J}{4500\ J}\\[/tex]
η = 0.0333 = 3.33 %
What is 2/9 divided by 4
Answer:
1/12
Explanation:
[tex]\frac{2}{9}[/tex]÷[tex]\frac{4}{1}[/tex]
Cross multiply
[tex]\frac{2}{9}[/tex]×[tex]\frac{1}{4}[/tex]
=[tex]\frac{3}{36}[/tex] then simplify to 1/12
Wave A carries more energy than wave B. Wave B must have a smaller than wave A. A. frequency B. amplitude C. wavelength D. speed
Answer:
Amplitude
Explanation:
The amount of energy a wave carries is determined by the amplitude. The larger the amplitude, the more energy the wave has, and the smaller the amplitude, the less energy the wave has.
In this case, since wave A has more energy than wave B, wave B must have a smaller amplitude than wave A.
Let me know if this helps!
How long will it take a - 1.26 * 10 ^ 4 force to stop a 2.30 * 10 ^ 3 truck moving at a speed of 22.2 m/s?
Answer:
4.1s
Explanation:
Given parameters:
Force applied = 1.26 x 10⁴ N
Mass of the truck = 2.3 x 10³kg
Speed of the truck = 22.2m/s
Unknown:
The time it will take to stop the truck = ?
Solution:
To solve this problem, we must understand that the momentum must be conserved.
So;
Momentum of the truck = Impulse applied on it
mass x velocity = Force x time taken
So;
Time taken = [tex]\frac{nass x velocity }{force }[/tex] = [tex]\frac{2300 x 22.2 }{12600}[/tex] = 4.1s
HELP
Match the term and the definition
Lesson 1.09
Question 5 options:
Cold Front
Stationary Front
Warm Front
Occluded Front
1.
When a cold air mass and a warm air mass meet but are at a standstill, the boundary is called
2.
If warm or more humid air presses forward and colder or drier air draws back, the boundary is called
3.
If colder or drier air presses forward and warmer or more humid air draws back, the boundary is called
4.
Sometimes a warm air mass can get caught between two cold fronts, which can force the warm air up into a wedge shape.
Answer:
Cold Front 3 // Stationary Front 1 // Warm Front 2 // Occluded Front 4
Explanation:
It's simple. Warm front means the warm air is pressing forward, which is why it's a warm front. Stationary Front, meaning they're at a standstill, also makes sense because stationary means not moving. Then since your last option is Occluded Front, since the others already have an answer, you have no choice but to match 4 with it. I took the quiz and got the answer right. :D
I tried 1760km but it says it’s wrong
Answer:
hmmmm
Explanation:
In the lab, You have a highly reactive metal like sodium. It is so reactive that water sets it off. How would you store it?
Answer:
Sodium is stored under paraffin oil
Explanation:
Group 1 metals are known to be very highly reactive. The chemical reactivity of the members of the group decreases down the group.
Sodium reacts violently with water and upon exposure to the atmosphere. As a result of this, it must be stored under paraffin oil.
the sound absorber is kept at the wall of cinema hall why
Answer:
because it causes echoes walls are good reflectors of sound
Explanation:
pls mark brainliest ;)
Which statement about the Law of Conservation of Mass is NOT true? A. Although the molecular makeup of molecules may change, the atoms are not lost. B. Matter is neither created nor destroyed during a chemical change. C. Chemical reactions create new atoms, which will increase the mass of the substance.
Answer:
C. Chemical reactions create new atoms, which will increase the mass of the substance.
Explanation:
It is not true that according to the Law of conservation of mass that mass of the substance will increase during chemical reactions.
During a chemical reaction, new atoms are not being created. The atoms of the reactant simply recombines to given a different product or compound. The atoms are still the same only the compound or product form differs.
According to the law of conservation of mass "in a chemical change, matter is neither created nor destroyed but bonds are broken and atoms combine".
By virtue of this, chemical reactions conserves mass so that the mass we start with is the same we end with since no new matter is destroyed nor created.
A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor. If the motor is used for 30 s, how much work does it do? (Power: P = W/t)
Answer:
they have given us
power = 900W
time = 30s
[tex]p = \frac{wd}{t} \\ p \times t = wd \\ 900 \times 30 = w.d \\ 27000j[/tex]
Answer: 27,000 J
Explanation:
Dogs are able to hear much higher frequencies then humans are capable of detecting. For this reason the crystals that are inaudible to the human ear can be heard easily by a dog. If a dog whistle has a frequency of 3.0 x 10^4 Hz, what is the wavelength of the sound emitted?
Answer:
Dogs are able to hear much higher frequencies than humans are capable of detecting. For this reason, dog whistles that are inaudible to the human ear can be heard easily by a dog. If a dog whistle has a frequency of 30,000 Hz, what is the wavelength of the sound emitted?
A train moves from rest to a speed of 25 m/s in 30.0 seconds. What is the acceleration?
Answer:
[tex]a = 0.83\ m/s^2[/tex]
Explanation:
Uniform Acceleration
When an object changes its velocity at the same rate, the acceleration is constant.
The relation between the initial and final speeds is:
[tex]v_f=v_o+a.t[/tex]
Where:
vf = Final speed
vo = Initial speed
a = Constant acceleration
t = Elapsed time
It's known a train moves from rest (vo=0) to a speed of vf=25 m/s in t=30 seconds. It's required to calculate the acceleration.
Solving for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
Substituting:
[tex]\displaystyle a=\frac{25-0}{30}[/tex]
[tex]\boxed{a = 0.83\ m/s^2}[/tex]
