Answer:
625 W
Explanation:
Applying
P = W/t.................... Equation 1
Where p = power, W = Work, t = time
But,
W = Force (F) × distance (d)
W = Fd........................ Equation 2
Substitute equation 2 into equation 1
P = Fd/t.................... Equation 3
From the question,
Given: F = 5000 N, d = 30 m, t = 4 munites = (4×60) seconds = 240 seconds
Substitute these values into equation 3
P = (5000×30)/240
P = 625 Watt
After a nucleus with 85 protons undergoes alpha decay, it has
? protons.
Answer:
After a nucleus with 85 protons undergoes alpha decay, it has 83 protons.
Explanation:
In an alpha particle there are two protons
In the given substance's nucleus, there are total of 85 protons
After the decay, the proton number reduce
The current proton number after decay is
85 -2 = 83
After a nucleus with 85 protons undergoes alpha decay, it has 83 protons.
The number of protons in this nucleus after it undergoes an alpha decay is 83 protons.
Given the following data:
Number of protons in nucleus = 85 protonsTo determine the number of protons in this nucleus after it undergoes an alpha decay:
The chemical symbol for an alpha particle is:
[tex]^{4}_{2} \alpha[/tex]
Therefore, we can deduce the following points about an alpha particle:
Mass number = 4Number of protons = 2After an alpha decay:
Protons = [tex]85-2[/tex]
Protons = 83
Therefore, the number of protons in this nucleus after it undergoes an alpha decay is 83 protons.
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which kind of energy is the most common by-product of the energy transformation?
Answer:
kinetic energy
Explanation:
it is most common
A graduate student is trying to follow the weather on Jupiter for her PhD thesis. To see the big weather patterns in the upper atmosphere of the planet, she needs to have excellent resolution. What type of telescope would be best for her to use? a. a refractor, with as small an aperture as possible b. a radio telescope c. a large reflector in an observatory located at sea level d. a large reflector located in orbit above the Earth's atmosphere e. you can't fool me, all these telescopes have the same resolution
Answer: large reflector located in orbit above the Earth's atmosphere
Explanation:
Since the student wants to see the big weather patterns in the upper atmosphere of the planet, and she will therefore need to have excellent resolution, the type of telescope that is ideal for her to use is a large reflector located in orbit above the Earth's atmosphere.
It should be noted that the refractor or a radio telescope isn't ideal in this situation as they will not capture the bug weather pattern and doesn't have an excellent resolution like the large reflector.
PLEASE ANSWER THIS QUICKLY, I WILL GIVE BRAINLIEST TO WHOEVER ANSWERS FIRST.
You and some friends are at the park. You find some rope and decide you'd like to
play a game of tug-of-war. Unfortunately, there are 5 people so you can't have an
equal amount of people on each side. One of your friends suggests that the two biggest people should be on one side, while the three smaller people should be on the other side. What do you think would be the best way to divide up the 5 friends for the game of tug-of-war?
Answer:
I would put one of each stronger people on the different teams and then divide up 1 person to one of the strong people and then 1 person to the other stronger person and then take the last person and make them the ref. They get to tell who is the winner and who is the loser.
Explanation:
Again this is just my opinion.
Answer:I agree with the other person
Explanation:
I agree with the other person
5. If a roller-coaster car has 40,000 J of gravitational potential energy when at rest on the top of a hill, how much kinetic energy does it have when it is ½ of the way down the hill?
A large bar magnet (mass of 0.4 kg) exerts a 5 N force on a small bar magnet (mass of 0.1 kg) located 20 cm away. Calculate the force exerted by the small bar magnet on the large one *
Answer:
5 N
Explanation:
Given that,
A large bar magnet of mass 0.4 kg exerts a 5 N force on a small bar magnet (mass of 0.1 kg) located 20 cm away.
We need to find the force exerted by the small bar magnet on the large one.
We know that, every action has an equal and opposite reaction. Both action and reaction occur in pairs. The force acting on one object to another is same and in opposite direction on the other object.
Hence, the force exerted by the small bar magnet on the large one is also 5 N.
As the amount of charge on two objects increases, the strength of the electrical force between the objects increases. decreases. varies. remains the same.For which pair of objects would adding the same amount of electrons to each object result in a decrease in the electric force? two positively charged objects two negatively charged objects two objects that have no charge two objects that have opposite charges
Answer:
a. Increases
b. Two objects that have opposite charges
Explanation:
a. As the amount of charge on two objects increases, the strength of the electrical force between the objects increases. decreases. varies. remains the same.
According to Coulomb's law, the electrical force, F between two charges q and Q is directly proportional to the product of the charges.
So, F ∝ qQ
So, if q and Q increase, their product increases and thus, the strength of the electrical force between them increases.
So, if the amount of charge of two objects increases, the strength of the electrical force between the objects increases.
b. For which pair of objects would adding the same amount of electrons to each object result in a decrease in the electric force? two positively charged objects two negatively charged objects two objects that have no charge two objects that have opposite charges
Since according to Coulomb's law, the electrical force, F between two charges q and Q is directly proportional to the product of the charges.
So, F ∝ qQ
If the same amount of electrons are added to both charges and the charges are opposite in sign, the magnitude of one charge increases while that of the other charge decreases. so the product qQ decreases and thus F decreases.
So, the electric force decreases when the same amount of electrons is added to two objects that have opposite charges.
Answer:
A increases
Explanation:
Which of the following frequencies produces the highest pitched
sound?
a 150 Hz
b 420 Hz
680 Hz
d 870 Hz
e None of the above
Answer:
d: 870 Hz
Explanation:
And PLEASE NO SCAMED WHAT IS WRONG AND WHAT IS RIGHT PLZZ HELP AND DO IT IN YOUR OWN WORDS BECAUSE MY TEACHER WILL KNOW AND HE WILL FLAGGED ME AND YES I AM N FLVS Science 6th grade so my teacher said i made a excellent hypothesis, recorded my data clearly, identified your variables accurately, analyzing how friction changes based on the surface texture. but what was wrong that i needed to add the total distance traveled for all 3 trials on each surface and then divide by 3 to get the average for each surface texture....
Procedures (4 points)
In this section please list ALL materials you used to complete your experiment, summarize the steps you took to complete the experiment and describe any difficulties or errors you encountered.
If an object rolls over (choose one type of material you used), then it will travel (choose one: the farthest distance/the shortest distance).
If the ball rolls over the carpet then It will travels the farthest distance.
For this lab I used the following materials: ball, books, carpet, floor tile, towel, ruler.
Short summary of what I did: (use words like first, next and last) First I stacked my books, Next I put my ruler next to the book last I put my ball on the top of the books and I let it roll down.
I experienced the following errors while doing my experiment: when I rolled the ball on the carpet it stopped at different centimeters per trial.
Test Variable/Independent Variable:
HINT: What was different about your test groups? What did you choose to test?
The difference about the test groups is they flooring, One was Carpet, Other Tile and Table.
I choose to test the ball if it were to stop at the same spot.
Outcome Variable/Dependent Variable:
HINT: What were you measuring? What data did you record?
I measure the ball rolling down the carpet, tile and table which provided me different data for each measuring.
Distance Object Traveled (in centimeters)
Floor Surface
Trial 1
Trial 2
Trial 3
Carpet
30cm
60cm
90cm
Tile floor
13cm
26cm
39cm
table
18cm
18cm
30cm
Floor Surface
Calculation of the Average (show your work)
Average Distance Traveled (answer)
carpet
30+30+30
90
Tile flloor
13+13+13
39
Table
18+18+18
54
Describe in your own words what friction is.
Friction is a force that opposes motion. Friction is basically the resistance of an object rubbing against another, such as a ball rolling down a hill, friction slows it down when rubbed against the grass.
Describe how friction affected the results of your investigation.
Friction slows down the ball if there no friction then it will make the object continue moving without slowing down.
Does an object travel farther on a smooth or slippery surface or on a rough surface? Why?
The object will travel on a slippery surface farther because when it slippery there no friction so it will travel faster.
Propose another experiment that could be used to demonstrate that friction is a contact force.
A hula hoops will twirl around you and it will stay in the air However it will have in upward force on your hips.
Answer:
just rry
Explanation:
At what angle does the beam of light fall into the mirror if the beam is reflected
makes an angle of 40 ° with that mirror
Answer:
The angle of incidence is the angle formed by the incident ray and the perpendicular to the surface. Together, the angle of incidence and the angle the incident ray makes with the surface form a right angle (90 degrees). The angle of incidence is therefore given by the following expression:
Angle of incidence = 90 degrees - angle ray makes with the surface
In your example
Angle of incidence = 90 degrees - 40 degrees = 50 degrees
The law of reflection states that the angle of incidence equals the angle of reflection, which is also measured with respect to the perpendicular to the surface, so
Angle of reflection = Angle of incidence = 50 degrees.
A 150kg motorcycle starts from rest and accelerates at a constant rate along with a distance of 350m. The applied force is 250N and the coefficient of kinetic friction is 0.03. What is the net force applied to the motorcycle?
Answer:
205N
Explanation:
The net force (F) is the difference between the applied force([tex]F_{A}[/tex]) and the kinetic frictional force([tex]F_{R}[/tex]). i.e
F = [tex]F_{A}[/tex] - [tex]F_{R}[/tex] -----------------(i)
Note that;
[tex]F_{R}[/tex] = μmg
Where;
μ = coefficient of kinetic friction
m = mass of the body
g = acceleration due to gravity = 10m/s²
Equation (i) then becomes;
F = [tex]F_{A}[/tex] - μmg -------------------(ii)
Given from question;
m = mass of motorcycle = 150kg
μ = 0.03
[tex]F_{A}[/tex] = 250N
Substitute these values into equation (ii) as follows;
F = 250 - (0.03 x 150 x 10)
F = 250 - (45)
F = 205N
Therefore, the net force applied to the motorcycle is 205N
Please help! I will mark you as brainliest!
Research revealed that patients who received chemotherapy in a hospital setting subsequently experienced
a(n) immune response when they again visited the hospital. In this example, the would be
classified as the US.
O enhanced; hospital
O suppressed; hospital
о
enhanced; chemotherapy
O suppressed; chemotherapy
Answer: suppressed; chemotherapy
Explanation:
Chemotherapy is typically a drug treatment whereby powerful chemicals are used to kill the fast growing cells in ones body. Chemotherapy is usually used in the treatments of cancer.
Research revealed that patients who received chemotherapy in a hospital setting subsequently experienced
a (suppressed) immune response when they again visited the hospital. In this example, the (chemotherapy) would be classified as the US.
Briefly describe how polygraph tests work. According to the American Psychological Association, these tests are not accurate at all, and they compare them to the flip of a coin. After describing how polygraph test works (in two to three sentences), discuss your thoughts on the accuracy of polygraph tests. Do you agree with the American Psychological Association? Do you think the tests have any benefit, or do you think they should be completely discontinued?
Answer:
no such thing i dont think
Explanation:
Answer:
Polygraph tests are used to determine whether someone is lying or not, and display the physical signs someone is showing when they speak to be interpreted. Polygraphs measure things like heartbeat, breathing rate, and electrical conductivity of the skin, which are signs that get more and more severe when someone tells major lies or lies a lot. Polygraph tests are pretty unreliable because everyone shows different reactions to speaking depending on how anxious they are or any other medical condition, which could falsely incriminate them, but I think it is still important to determine the signs someone displays to use as a datapoint later on in the trial. For those reasons, they should still be used but shouldn't be relied on as heavily.
Explanation:
describe how you can see and feel sound waves
Answer:
Sound is a vibration, or wave, that travels through the air. Sound waves are invisible to our eyes; unless we find a way to make the sound waves move something that we can see. In this activity, your child will use different noise-making objects to cause sound waves and make sand visibly move.
Sound wave can be described by five characteristics: Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed. The minimum distance in which a sound wave repeats itself is called its wavelength.
Explanation:
When the vibrating air hits your eardrum, it causes your eardrum to vibrate, just as the balloon did. These vibrations are transferred through the tiny bones in your ear to the inner ear. These vibrations are detected by nerves, which send impulses that your brain "hears" as sound.
Which diagram represent light with the longest wavelength ?
Answer:
the answer is the diagram B
a spherical mirror produces a magnification of -1 on a screen placed at a distance of 40cm from the mirror i) write the type of mirror ii) What is the focal length of the mirror
Answer:
f =-20 cm
Explanation:
Given that,
The magnification of a spherical mirror, m = -1
The image distance, v = 40 cm (for negative magnification)
The magnification of a concave mirror is negative. The mirror showing -1 magnification is a concave mirror.
Let f be the focal length of the mirror. We know that,
[tex]m=\dfrac{-v}{u}\\\\-1=\dfrac{-v}{u}\\\\v=u[/tex]
Object distance, u = -40 cm
Using mirror's formula i.e.
[tex]\dfrac{1}{f}=\dfrac{1}{u}+\dfrac{1}{v}\\\\f=\dfrac{1}{\dfrac{1}{-40}+\dfrac{1}{-40}}\\\\f=-20\ cm[/tex]
So, the focal length of the mirror is 20 cm.
What does it mean when a wave is reflected?
Answer:
light can bounce off the material, which is called reflection. The reflection of a wave is simply a process by which a wave, whether light, sound, infrared, or radio waves, hits an object and bounces off it.
Explanation:
Answer:
It is reflection because the light will instead of passing through will bounce off a material and be reflected to another surface or material
La onda que se muestra en la figura recorre la distancia AB= d =75m en t = 0.15s. Determine: A. La rapidez de propagación B. La longitud de onda C. La frecuencia
ah=d=75m= 0.15s A B C Hola cómo estás das que ases de bueno amiga
Calculate the mass of a truck traveling at 30.56 m/s that has a starting momentum of 77,000 kg*m/s
Answer:
2519.63 kg
Explanation:
mass(m)=momentum (p)/velocity
=77000/30.56
=2519.63kg
What does "Time (s)” represent in the graph?
Answer:
in graphs .s. means seconds
Explanation:
and m means minutes ...............do u understand dear.............am not that good in math but am accurate about this one
shoppers often take clothes outside to look at them in daylight before deciding whether to buy why do they do this pls answer
Answer:
Colors appear differently. Different light sources give off different rays that affect the color
The shoppers often take clothes outside to look at them in daylight before deciding whether to buy them because they can see the true color of the clothes only in sunlight where no bulb light is reflecting on the clothes.
What is reflection?A wave will rapidly reverse course and reflect when it hits a barrier between two media. At least a portion of the oncoming wave disturbance remains in the same medium. Regular reflection occurs at plane boundaries in accordance with a simple law.
The angle of incidence, or the angle between the motion of an approaching wave and a perpendicular to the reflecting surface, is equal to the angle between the motion of a reflected wave and a perpendicular (angle of reflection).
The shoppers often take clothes outside to look at them in daylight before deciding whether to buy because the color is true in pure sunlight, the room light, or bulb light the color will appear true.
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A) Calculate the torque required to accelerate the Earth in 7 days from rest to its present angular speed about its axis. (b) Calculate the energy required. (c) Calculate the average power required.
Answer:
A) 1.3013476 × 10²⁸ N·m
b) 2.8618128 × 10²⁹ J
c) 4.73183333 × 10²³ W
Explanation:
The mass of the Earth, M = 5.972 × 10²⁴ kg
The radius of the Earth, R = 6,371 km
The angular speed of the Earth, ω = 2·π/(24 hr) = 7.27220522 × 10⁻⁵ rad/s
The shape of the Earth ≈ Spherical
The moment of inertia of a sphere, I = (2/5)·M·R²
The angular acceleration of the Earth in 7 days from rest its present angular speed, ω, is given as follows;
α = 7.27220522 × 10⁻⁵ rad/s/((7 × 24 × 60 × 60) s) = 1.2024149 × 10⁻¹⁰ rad/s²
Torque, τ = I × α
∴ τ = (2/5) × 5.972 × 10²⁴ × 6,731,000² × 1.2024149 × 10⁻¹⁰ = 1.3013476 × 10²⁸
The torque required, τ = 1.3013476 × 10²⁸ N·m
b) The energy required, [tex]K.E. _{(Rotational)}[/tex] = 1/2 × I × ω²
∴ [tex]K.E. _{(Rotational)}[/tex] = (1/2) × (2/5) × 5.972 × 10²⁴ × 6,731,000² × (7.27220522 × 10⁻⁵ rad/s)²
The energy required, [tex]K.E. _{(Rotational)}[/tex] = 2.8618128 × 10²⁹ J
c) Power = Energy/Time
Therefore, the average power required, P = [tex]K.E. _{(Rotational)}[/tex]/Time
∴ P = 2.8618128 × 10²⁹ J/(7 × 24 × 60 × 60) s) = 4.73183333 × 10²³ Watts
The average power required, P = 4.73183333 × 10²³ Watts.
Which of the following statements best describes the method of energy conservation known as cogeneration?
Answer:
heat and power
Explanation:
is the simultaneous production of electricity and heat both of which are used
A laboratory burner transfers 309 J of thermal energy into a 100. g borosilicate glass beaker, causing its temperature to rise by 3.69 °C. What is the specific heat of borosilicate glass?
When borosilicate glass is undergoing change in temperature, heat is transferred. The specific heat of borosilicate glass is 837.4 J/kg. °C
What is specific heat?The specific heat is the amount of heat stored per kilogram of substance by 1 degree rise in temperature.
Given is the mass of borosilicate glass m =100 g =0.1 kg, heat transferred Q = 309J, temperature change ΔT = 3.69°C
Q = m x Cp x ΔT
309 = 0.1 x Cp x 3.69
Cp = 837.4 J/kg. °C
Thus, the specific heat of borosilicate glass is 837.4 J/kg. °C
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2. A volleyball player strikes a 3 kg volleyball with a velocity of 14 m/s. What is the kinetic energy of the volleyball?
3. A cat jumps off a table with 750 J of kinetic energy at 10 m/s. Find the cat's mass.
Answer:
2. 294 j
3. 37500 J
Explanation:
Answer:
2)294 3)15
Explanation:
2)E=mv^2/2
E=3×14^2/2
E=3×196/2
E=3×98
E=294 J
3)E=mv^2/2
m=2E/v^2
m=2×750/10^2
m=2×750/100
m=750/50
m=15
is rainwater hardwater?
Answer:
As rainwater falls, it is naturally soft. However, as water makes its way through the ground and into our waterways, it picks up minerals like chalk, lime and mostly calcium and magnesium and becomes hard water. ... Even hair washed in hard water may feel sticky and look dull.
Explanation:
Which of the following equations is dimensionally invalid
a. v=x+at
b. x=at^2
c. v=[tex]\sqrt{2ax}[/tex]
d. v[tex]v_{f} =v_{i} -at[/tex]
The loudness of a sound depends on the sound wave's ________. A. frequency B. pitch C. amplitude D. density
Answer:
Frequency or amplitude
Explanation:
nun
when is the image virtual in a concave mirror?
The brakes applied to a car
produce an acceleration of 6 m s-²
the opposite direction to the motion. If
the car takes 2 seconds to stop after the
application of brakes, calculate the
distance it travels during this time.
Explanation:
[tex]from \: newton \: first \: equation \\ V = U + at \\ 0 = U + ( - 6 \times 2) \\ U = 12 \: m {s}^{ - 1} \\ from \: newtons \: third \: equation \\ {V}^{2} = {U}^{2} + 2aS \\ 0 = {12}^{2} + (2 \times - 12 \times \: S ) \\ 144 = 24S \\S = 6 \: m [/tex]