How much power is generated if 375 J of work is done in 15 s?
Answer: 25 watt
Explanation:
Given,
Work= 375 j
Time= 15
So, power = W÷t
= 375 ÷ 15
= 25 watt
A person weighing 645 N climbs up a ladder to a height of 4.55 m what is the increase in gravitational energy
Answer: 2934.75 Joules
Explanation:
Potential energy can be defined as energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
P.E = mgh
Where P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per second square.
h represents the height measured in meters.
Given the following data;
Weight =645
Height = 4.55
P.E = mgh
But we know that weight = mg = 645N
Substituting into the equation, we have;
P.E = 645 • 4.55
P.E = 2934.75J
Potential energy, P.E = 2934.75 Joules.
which continent had to move the furthest to get to where it is today based on where it was in Pangaea.
Asia I think that's right
What is one force listed below which helps to stop the
motion of a sled moving down a snowy hill on its own?
A.) Air Resistance
B.) Applied Force
C.) Gravity
D.) Buoyancy
Answer:
applied force
Explanation:
An applied force is a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force
If I was floating in space, why would a scale read my weight as "0"?
Answer:
No external contact force.
Explanation:
Mass is defined as the amount of material an object contains, that doesn't change whether the object it on earth, on the moon or anywhere in space. Except the only force that is acting upon the body in gravity and they don't feel gravitational attraction towards the earth.
How is the velocity of a wave affected by its frequency, wavelength, and period?
Answer:
I can only explain using the formula
Explanation:
v=f
[tex]v = f \times lamda[/tex]
v is velocity
f is frequency
lamda is wavelength ( I don't have the symbol)
therefore velocity is the product of frequency and wavelength
And since period is the inverse of frequency;
Period (T)=1/f
so we can have v=lamda/T
That's what I think
A car moving at a constant speed changes direction. Is the car accelerating? How do you know?
Answer:
No
Explanation:
Acceleration is the rate of change in velocity. Here the car maintains a constant speed, no change in velocity
Which of the following elements is NOT considered a halogen?
-Bromine (Br)
-Chlorine (Cl)
-Fluorine (F)
-Argon (Ar)
Answer:
Argon
Explanation:
Halogens are elements within group 17 on the periodic table. As argon is in group 18, which means it is a noble gas. Bromine, chorine, and flourine are all in group 17, making them halogens.
In air, a sound wave with a frequency of 200 Hz has a wavelength of about 1.5 meters. What is the wavelength of a wave if the frequency is increased to 600 Hz?
Answer:
see below
Explanation:
first of all, you find the speed of sound in air
which is
speed = frequency x wavelength
so
speed = 200 x 1.5
speed = 300 m/s
speed remains the same in the same medium
so you can use speed and frequency to find wavelength
speed = frequency x wavelength
300 = 600 x wavelength
wavelength = 0.5 m
hope this helps, please mark it brainliest
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer these correctly!!!! (40pts)
Answer: A
Explanation:
Just speed I think.
Speed is scalar, while velocity is a vector so you would need a direction. For acceleration you would need to know the specific speed at different points in time.
A cheetah can run 140 miles in 2 hours.
The information we can calculate about the cheetah given this information is the "speed" (A).
Is this compound Ionic or Covalent? fr2o
Answer:
it is an ionic compound
Explanation:
what causes mechanical waves?
HELP PLZ HELP !!!!!!!!!!!
Answer:
From least to greatest: Neon, Sodium, Silicon, Iron, Uranium
Explanation:
Here are all the atomic numbers for each one:
Iron = 26
Sodium = 11
Uranium = 92
Neon = 10
Silicon = 14
Hope this helps! :D
An unknown element has 5 protons, 5 electrons, and 6 neutrons what is the atomic mass of this element
The atomic mass is the protons + the neutrons.
So your answer would be 5 + 6 = 11.
Please mark Brainliest! :)
hypsometer (upper fixed point
Answer:a device for calibrating thermometers at the boiling point of water at a known height above sea level or for estimating height above sea level by finding the temperature at which water boils.
Explanation:
PLEASE HELP FILL IN TWO OPTIONS I WILL MARK BRAINLIEST IF RIGHT!
Answer:
Your answers are Continental crust and Mountain range.
Explanation:
Continental crust is the first blank, and Mountain range the second.
I hope I helped, and I always appreciate Brainliest!!! :)
How much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m^2 exerts a pressure of 5 pa?
Answer:
Weight, W = 125 N
Explanation:
Pressure, P = 5 Pa
Area, A = 25 m²
We need to find how much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m² exerts a pressure of 5 Pa. So,
Pressure = force/area
So,
[tex]F=P\times A\\\\F=5\times 25\\F=125\ N[/tex]
So, the weight of the man is 125 N.
Please help??!
Which of the following uses repeating vowel sounds?
1.The cold, soulless vacuum of space
2. Cool, blue, moonlit room
3. If loneliness is a disease, love is the cure
4. Windy, whooshing weather
Answer: 4. Windy, whooping weather
Explanation: b/c it is!
Answer:
Windy, whooping weather
Explanation:
thats the answer
How can inclined planes change the amount of force to move an object? A. Increase height of the inclined plane B. Increase distance of the inclined plane C. Use a wooden inclined plane instead of a metal one D. None of the above
Answer:
Option ( B ) is correct .
Explanation:
To lift a heavy weight , inclined plane is used . Use of inclined plane , makes the task easier because instead of force mg , force mg sinθ is to be used which is less than mg . Here θ is inclination of inclined plane.
If h be the height by which weight is to be lifted
potential energy acquired by weight = mgh
work done by force mg sinθ = mgsinθ x d where d is displacement required .
mg sinθ x d = mgh ( work done by force = potential energy stored in luggage )
d = h / sinθ
d will be more than h
Hence inclined plane increases the distance to be covered by force applied though it decreases the force itself.
Hence option ( B ) is correct .
is corona the least dense layer in the sun? please fast
Answer:
the Corona is about 10 million times less dense than sun's surface.this low density makesuch less bright than surface of the sun
Answer:
dude the ans no corona,
Explanation:
It cannot survive in space let alone be one of the layer of the sun due to its high temperature ( that is 2million fahrenheit )
Hernando builds a simple DC series circuit with a standard D-cell battery and uses an ammeter to determine that the total current in the system is 3.0 A. In an attempt to increase the brightness of the bulbs in the circuit, he tries to increase the voltage by adding two more batteries (in series with the first). Calculate the new current when driven by three batteries.
Answer: I = 9.0 A
Explanation: Ohm's Law is defined as the relationship between voltage and current: in a circuit, the voltage accross a conductor is directly proportional to the current.
The constant of proportionality is Resistance, whose unit is ohm (Ω).
so, Ohm's Law is
V = R.I
It is asked for the current, so, rearraging:
[tex]I=\frac{V}{R}[/tex]
When added two more batteries, the voltage of the circuit triples:
[tex]V_{final}=3V_{initial}[/tex]
Since they are directly proportional, if voltage triples, so does current:
[tex]I_{final}=3I_{initial}[/tex]
[tex]I_{final}=3(3.0)[/tex]
[tex]I_{final}=[/tex] 9.0
The new current, when driven by 3 batteries is 9.0 A.
An athlete whirls a 7.00 kg hammer 1.8 m from the axis of rotation in a horizontal circle, as
shown in the figure below. The hammer makes one revolution in 1.0 s. What is the tension in
the chain?
A-500 N
B-50 N
C-5000 N
D-5 N
Answer:
A-500 N
Explanation:
The computation of the tension in the chain is shown below
As we know that
F = ma
where
F denotes force
m denotes mass = 7
And, a denotes acceleration
Now for the acceleration we have to do the following calculations
The speed (v) of the hammer is
v = Angular speed × radius
where,
Angular seed = 2 × π ÷ Time Period
So, v = 2 × π × r ÷ P
v = 2 × 3.14 × 1.8 ÷ 1
= 11.304 m/s
Now
a = v^2 ÷ r
= 70.98912 m/s^2
Now the tension is
T = F = m × a
= 7 × 70.98912
= 496.92384 N
= 500 N
The work per unit charge required to move a charge between two points in an electric circuit defines electric
A) force
B) Power
C) field strength
D) potential difference
The work per unit charge required to move a charge between two points in an electric circuit electric potential difference. The right option is D) potential difference
What is electric potential difference?Potential difference can be defined as the work done in moving a unit charge from one point to another in an electric field. The S.I unit of potential difference is volts (V).
From the question,
Force: is the product of mass and acceleration Power: This is the rate at which work is done.Field strength: This is the force per unit charge in a field.Potential difference: This is the work done in moving a unit charge from one point to another in a field.Hence, from the above, the right option is D) Potential difference
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what is the velocity of a 1200 kg boat with a kinetic energy of 160,000 J
What is a scientific model?
Answer:
A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.
Answer:
D
Explanation:
Hurry need help ASAP
Answer:
last one
Explanation:
What is difference between continuous and discontinuous variations? Give examples for each of it
Answer:
Examples. Weight, height, and length of organisms are examples of continuous variation while the color of petals, blood groups of animals, the gender of animals, etc. are examples of discontinuous variation.
Explanation:
Hope it helps
A plane loaded with cargo travels 2000 miles at an average speed of 400 Miles per hour. On the return trip on the same route it travels at an average speed of 480 miles per hour. How much quicker was the return trip
Answer:
Difference = 1.83 hours
Explanation:
Let the two trips be A and B respectively.
Given the following data;
Distance A = 2000 miles
Speed A = 400 miles
Distance B = 2000 miles
Speed B = 480 miles per hour
To find the time spent;
a. For trip A.
Time A = distance A/speed A
Time A = 2000/400
Time A = 5 hours
b. For trip B.
Time B = distance B/speed B
Time B = 2000/480
Time B = 4.17 hours
Next, we would find the difference between the two trips.
Difference = Time A - Time B
Difference = 5 - 4.17
Difference = 1.83 hours
Therefore, the return trip was much quicker by 1.83 hours.
The return trip of the airplane will be quicker by 1.84 hours
What will be the time taken by the airplane on the second trip?It is given that
Distance covered by the plane D= 2000 miles
The average speed of the plane
[tex]V_1=400\ \frac{Miles }{hour }[/tex]
The Return Average speed of the plane
[tex]V_2= 480\ \frac{Miles}{hour}[/tex]
Now we will first find the time taken by the airplane during the first visit.
[tex]V_1=\dfrac{Distance }{Time }[/tex]
[tex]Time = \dfrac{Distance }{V_1}[/tex]
Now by putting the values in the formula
[tex]T_1=\dfrac{2000}{400} =5\ hours[/tex]
Now for the return trip time taken by the plane
[tex]T_2=\dfrac{Distance }{V_2}[/tex]
[tex]T_2= \dfrac{2000}{480}[/tex]
[tex]T_2= 4.16\ hours[/tex]
Now the difference between the time will be
[tex]=T_1-T_2=5-4.16=0.86=1.84 \ Hours[/tex]
Thus the return trip of the airplane will be quicker by 1.84 hours
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Which statement explains how ocean currents affect climate?(1 point)
Ocean currents change the temperature of air masses. Cold ocean currents transport heat from the equator to the poles.
Ocean currents change the temperature of landmasses. Cold ocean currents transport heat from the equator to the poles.
Ocean currents change the temperature of air masses. Warm ocean currents transport heat from the equator to the poles.
Ocean currents change the temperature of landmasses. Warm ocean currents transport heat from the equator to the poles.
Answer:
C
Explanation:
Warm water and precipitation are transported from the equator to the poles by ocean currents, whereas cold water is returned to the tropics from the poles. Ocean currents control climate globally by balancing out the uneven distribution of solar radiation that reaches Earth's surface.
What Ocean currents, the temperature of landmasses?Short-distance currents can travel across entire ocean basins, while longer ones can even circle the earth. Ocean currents are vital in regulating the climate because they transport heat from the equator to the poles.
The distribution of air temperature is significantly influenced by ocean circulation. The warm Gulf Stream in the North Atlantic and the chilly Peru (Humboldt) Current in South America are two examples of ocean currents with a northward or southbound component that efficiently exchange heat between low and high latitudes.
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PLEASE HELP!!!!
An electron is located 4.22 mm away from an isolated proton. If the distance between the two particles is increased to 8.44 mm, what
happens to the electrical potential energy of the electron and why?
O A. The electrical potential energy will increase because work must be done to separate two particles that attract one another.
B. The electrical potential energy will remain the same because the electron and proton are both fundamental particles and their
charge cannot be changed.
O
C. The electrical potential energy will increase because larger energies are associated with greater distances.
O D. The electrical potential energy will decrease because no work is necessary to increase the distance between particles that
demonstrate attraction.
You can download answer here
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If the distance between the two particles is increased to 8.44 mm, the electrical potential energy will increase because work must be done to separate two particles that attract one another. Hence option(A) is correct.
What is potential energy?Potential energy is the energy held by an object as a result of its position relative to other objects, internal stresses, electric charge, or other factors.
The gravitational potential energy of an object, the elastic potential energy of an extended spring, and the electric potential energy of an electric charge in an electric field are all examples of common types of potential energy. The joule, denoted by the symbol J, is the unit of energy in the International System of Units (SI).
The positive and negative charges attract each other, so work must be done to separate two particles. Hence, the electrical potential energy will increase.
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