Answer:
its b
Explanation:
cause im in 7th grade ive been asked the same question
calculate the efficiency of a light bulb that had an input of 400 j transfers 100j as a light and 300j as heat.
please help!!! zoom in to read it clearly
Answer:
imma try nd help cuz i havent seen anybody answer so
1.sara
2.same for both
3.tom
Explanation:
The SI unit of refractive index is ___
a)km/s. b)m/s. c)sec. d)no unit
Answer:
d)no unit
Explanation:
refractive index is a unit less quantity.
6. A jet aircraft travels 1200 km in 1 hr 20 min.
a. How many meters (m) does it travel?
b. For how many minutes does it travel?
c. And for how many seconds?
1200000
80min
4800seconds
The jet aircraft travels 1,200,000 meters, for 80 minutes, and for 4800 seconds.
a. To find the distance traveled in meters, we need to convert 1200 km to meters. There are 1000 meters in one kilometer, so the distance in meters can be calculated as follows:
Distance in meters = 1200 km × 1000 m/km = 1,200,000 meters.
b. To find the total time traveled in minutes, we have to convert 1 hour and 20 minutes to minutes. Since 1 hour is equal to 60 minutes, the total time in minutes is:
Total time in minutes = 1 hour × 60 minutes/hour + 20 minutes = 80 minutes.
c. To find the total time traveled in seconds, we need to convert the total minutes to seconds. There are 60 seconds in one minute, so the total time in seconds is:
Total time in seconds = 80 minutes × 60 seconds/minute = 4800 seconds.
Therefore, the jet aircraft travels 1,200,000 meters, for 80 minutes, and for 4800 seconds.
To know more about distance traveled, here
brainly.com/question/12696792
#SPJ2
A car covers 100 km in 2 h , what is the speed of the car. {I want full answer}
Answer:
52.8 km/h.Explanation:
The average speed of the car is 52.8 km/h.A car covers a distance of 100 km in first two hours and 32 km in next half an hour. Average speed is equal to total distance divided by total time taken. It is given by : So, the average speed of the car is 52.8 km/h.The coach has not seen improvement as expected in his team and plans to change practice session. To help the players he changes the Frequency, Intensity, Time and Type of their exercise and uses the fitness principle of frequency
overload
progression
reversibility
Answer:
progession
Explanation:
An 800-newton person is standing in an elevator. If the upward force of the elevator on the person is 600 Newtons, the person
Answer:
person is accelerating downwards
Explanation:
We are told that the force of the person standing on the elevator is 800 N acting downwards.
We are also told that the upward force of the elevator on the person is 600 Newtons.
This means that Upward force is lesser than downward force and thus the person is accelerating downwards
Answer:
accelerating downward
Explanation:
Took it on test
An electron and a proton are fixed at a separation distance of 973 nm. Find the magnitude and the direction of the electric field at their midpoint.
Answer:
The magnitude is: [tex]|E|=6084.1\: N/C[/tex]
The direction of E is in the negative x-direction.
Explanation:
The electric field equation is:
[tex]E=k\frac{Q}{r^{2}}[/tex]
Where:
Q is the charge (we can choose the electron or the proton)r is the distance (in our case is at the midpoint 973/2 nm)k is the Coulomb constant ([tex]9*10^{9}\: Nm^{2}C^{-2}[/tex])Using the electron charge ([tex]e = -1.6*10^{-19}\: C[/tex])
[tex]E=-9*10^{9}\frac{1.6*10^{-19}}{(486.5*10^{-9})^{2}}[/tex]
The magnitude is:
[tex]|E|=6084.1\: N/C[/tex]
The direction of E is in the negative x-direction.
I hope it helps you!
The magnitude and direction of an electric field is required.
The electric field at the midpoint is [tex]12168.21\ \text{N/m}[/tex] the direction is towards electron.
k = Coulomb constant = [tex]9\times 10^9\ \text{Nm}^2/\text{C}^2[/tex]
q = Charge of particle = [tex]1.6\times 10^{-19}\ \text{C}[/tex]
r = Distance between the electron and proton = 973 nm
The electric field will be
[tex]E=\dfrac{2kq}{\left(\dfrac{1}{2}r\right)^2}\\\Rightarrow E=\dfrac{8kq}{r^2}\\\Rightarrow E=\dfrac{8\times 9\times 10^9\times 1.6\times 10^{-19}}{(973\times 10^{-9})^2}\\\Rightarrow E=12168.21\ \text{N/m}[/tex]
Learn more:
https://brainly.com/question/14804175?referrer=searchResults
1 Newton = 1 ___?
A) kg*m/s
B)kg/m
C)m/s^2
D)kg*m/s^2
Answer:
D) kg*m/s^2
Explanation:
One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.
define real machine.
Answer:
a piece of equipment with moving parts that does work when it is given power from electricity, gasoline, etc.
Explanation:
Have A Wonderful Day !!
The mass of a lump of gold remains constant whereve
may be shifted to. Explain.
Explanation:
Mass of a lump of gold remains constant where they may be shifted to because mass is depends on the amount of matter within a substance.
Mass is an extensive property that depends on the variation of the quantity of matter in a body. If the mass of a substance is to remain constant, then no amount of matter must be added or removed from a body. When substances are taken away for a given body, then there would be an alteration in the value of its mass.At anywhere in the universe, the mass of a body is a constant provided there is no loss in the amount of matter it contains.
Light waves are:
O Mechanical Waves
o Electromagnetic Waves
electromagnetic
all electromagnetic waves move at the speed of light.
so yes, light waves are electromagnetic waves :)
i hope this helps!
HELP!!! ASP EASY QUESTION! WILL GIVE BRAINEST IF U ANSWER!
Without the ___, a plant wouldn't have any pollen.
The water table is the upper limit of the
zone of saturation.
zone of aeration.
aquifer zone.
well zone.
Answer:
zone of saturation
Explanation:
The water table is the upper limit of the zone of saturation. At the zone of saturation, the aquifers are filled with water completely. The void spaces within the rock particles are taken up by fluids.
The upper limit of this zone is the water table.
Above the water table is the zone of aeration where the pore spaces are filled within air.
During the time of recharge especially raining seasons, part of the zone of aeration are filled with water.
Answer:
zone of saturation.
Explanation:
A type of dripstone formation where the deposits hang from the ceiling of the cave is called a ________________________________.
Group of answer choices
stalactite
carbonate rock
stalagmite
Answer:
Stalactites
Explanation:
these formations are created by dripping water in a cave that is rich in minerals that develop for hundreds of years. stalagmites are also known for their comedic name "cave bacon" I hope this helped!
A type of dripstone formation where the deposits hang from the ceiling of the cave is called a stalactite. Stalactites are formed when water containing minerals, such as calcium carbonate, drips from the ceiling of a cave. Over time, the water evaporates, leaving behind mineral deposits that build up and form a long, icicle-like structure hanging from the ceiling. Stalactites can vary in size and shape, and they are often found in caves with dripping or seeping water. They can take thousands of years to form, as the mineral-rich water slowly deposits minerals layer by layer.
PLEASE PLEASE HELP ME ILL GIVE U BRAINLIEST JUST FILL IN THE BLANKS
Answer:
38 kg.m/s
Explanation:
Momentum
Momentum is often defined as "mass in motion".
Since all objects have mass, if it's moving, then it has momentum. The momentum is a vector and It can be calculated as the product of the mass by the velocity of the object:
[tex]\vec p = m\vec v[/tex]
If only magnitudes are considered:
p = mv
We are given that an m=9.5 kg turkey is running at v=4 m/s. Below is the formatted data:
p = ?
m = 9.5 kg
v = 4 m/s
Formula
p = m v
[tex]p = 9.5 \cdot 4[/tex]
p = 38 kg.m/s
The filled table is included below
And explosion occur 17 km away the time it takes for it sound to reach your ears traveling at 340 m/s is
Answer:
t = 100secsExplanation:
The following data
Distance x = 17km = 17000m
Speed v = 340m/s
Using the formula to get the time;
2x = vt
t = 2x/v
t = 2(17000)/340
t = 34000/340
t = 100secs
Hence it takes 100seconds for the sound to reach your ears
Match these items. 1 . full moon a visible half-circle 2 . first-quarter moon darkest phase of the moon 3 . 13 degrees when the the Earth is between the sun and the moon 4 . 29 1/2 days this is a measurement of how far the moon advances each day in orbit 5 . new moon the time the Earth must rotate to return to same position relative to the moon
Answer:
1. First-quarter moon.
2. New moon.
3. Full moon.
4. 13 degrees.
5. 29 1/2 days.
Explanation:
A moon can be defined as the natural satellite of planet earth that shines as a result of the sun's reflected light, as it revolves around the earth from west to east in 29½ days.
1. First-quarter moon: a visible half-circle.
2. New moon: darkest phase of the moon.
3. Full moon: when the the Earth is between the sun and the moon.
4. 13 degrees: this is a measurement of how far the moon advances each day in orbit.
5. 29 1/2 days: the time the Earth must rotate to return to same position relative to the moon.
Match the information below with the type of energy it can be used to calculate.
Words to fill the blanks:
1.
Potential Energy
2.
Kinetic Energy
3.
Both Potential and Kinetic Energy
Answer:
Explanation:
Mass - 3
Height - 1
Gravity - 1
Velocity - 2
Potential Energy: mgh
Kinetic Energy: 1/2mv^2
A kid on a playground swing makes a complete to-and-fro swing each 2 seconds.
The frequency of swing is: ____________Hertz The period is: _________ Seconds
can someone please explain how to do this? Thanks.
Answer:
The frequency of the swing: 1/2 Hertz
The period is: 2 Seconds
Explanation:
The time the kid takes to make a complete to-and-fro swing = 2 seconds
The period, T, is the time it takes to make one complete cycle of an oscillatory motion, therefore, we have;
The frequency, f, is the number of cycles completed each second, therefore, we have;
The time for 1 cycle = 2 seconds
2 seconds = 1 cycle
Dividing both sides by 2 gives;
2/2 seconds = 1/2 cycles
2/2 = 1
In 2/2 = 1 seconds The number of cycles completed = 1/2 cycles
Therefore, the number of cycles completed per (one) second = 1/2 cycles
Therefore the frequency of the swing, f = 1/2 cycle/seconds = 1/2 Hertz
The period, T, is the time it takes to complete one to-and-fro swing which is one cycle which is 2 seconds
Therefore, the period is 2 Seconds.
Carly has discovered a new radioactive isotope: unicornium-210. Based on atomic mass alone, into which of the following elements could 210Ui not decay?
A. 238U
B. 90Sr
C. 115Eu
D. 151Sm
Answer:
A
Explanation:
The element that unicornium-210 (210Ui) could not decay into based on atomic mass alone is 90Sr.
What is radioactive isotope?A radioactive isotope is a type of atom that has an unstable nucleus that spontaneously decays or disintegrates, emitting radiation in the form of particles or electromagnetic waves. This process is known as radioactive decay.
The unstable nature of the nucleus arises from having too many or too few neutrons compared to the number of protons in the atom, which affects the stability of the atomic nucleus. The decay of radioactive isotopes can have practical applications in fields such as nuclear medicine, energy production, and environmental monitoring, but can also pose health and safety risks if not handled properly.
Learn more about radioactive isotope, here;
https://brainly.com/question/1907960
#SPJ2
One object has a mass of 1 kg and another object has a mass of 3 kg. If the speeds are the same, which of the following is true about their kinetic energy?
Their masses are the same.
The object with a higher mass has three times the kinetic energy of the less massive object.
It is impossible to determine without the speeds.
The object with a smaller mass has a greater kinetic energy than the object with a higher mass.
Answer:
The object with a higher mass has three times the kinetic energy of the less massive object.
We know that K.E.= 1/2 mv²
mass of first object = 1kg
speed = v
So K.E. = 1/2mv²
= 1/2 × (1) × v²
=
[tex] \: \: \: \: \: \: \: \: \: = \frac{1}{2} {v}^{2} \\ [/tex]
Now the mass of second body = 3kg
speed = v
So K.E. = 1(3)v²/2
=
[tex] \: \: \: \: \: \: \: \: \: = \: \: \frac{3}{2} {v}^{2} \\ [/tex]
now
K.E of first / KE of 2nd
[tex] \frac{1}{2} {v}^{2} \div \frac{3}{2} {v}^{2} \\ [/tex]
[tex]\frac{ \frac{ke \: of \: first \: }{ - - - - - - - - - - -} }{ \frac{ke \: of \: 2nd}{} } = \frac{ \frac{1}{ - -} }{ 3 } \\ \\ so \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \\ 3(ke \: of \: first \:) = ke \: of \: 2nd[/tex]
a friction force that acts on objects that are not in motion is what
Answer:
Static friction
Explanation:
Static friction is the friction force that acts on objects that are not moving.
an object 16n of force being applied to the right 126n of force being applied to the left and 4n force being applied downward what is the acceleration of an object if its mass was 0.35kg
Answer:
The acceleration of the object is 314.57 m/[tex]s^{2}[/tex].
Explanation:
From Newton's second law of motion,
F = ma
where: F is the force applied on an object, m is the mass of the object and a is the acceleration of the object.
⇒ a = [tex]\frac{F}{m}[/tex]
In the given question, the resultant force, F should be determined.
Total horizontal force, [tex]F_{x}[/tex] = 16 - 126
= -110 N
The horizontal force applied to the object is 110 N to the left.
Vertical force, [tex]F_{y}[/tex] = 4 N.
Resultant force, F = [tex]\sqrt{F_{x} ^{2} + F_{y} ^{2} }[/tex]
= [tex]\sqrt{(-110)^{2} + (4)^{2} }[/tex]
= [tex]\sqrt{12116}[/tex]
= 110.0727
Resultant force, F = 110.1 N
So that,
a = [tex]\frac{110.1}{0.35}[/tex]
= 314.5714
a = 314.57 m/[tex]s^{2}[/tex]
The acceleration of the object is 314.57 m/[tex]s^{2}[/tex].
The dorsal body cavity is divided into which two cavities?
the thoracic cavity
the cranial cavity
the vertebral cavity
the pelvic cavity
the dorsal cavity
Answer: the dorsal cavity
Explanation:
Dorsal body cavity is the body cavity in the human body which is located posteriorly and it comprises of two type of body cavities that are cranial and the spinal. The cranial cavity is formed inside the skull and it protects the vital organ brain inside the bony protection and the spinal cavity houses the spinal cord. Thoracic cavity and pelvic cavity are the ventral cavities that means they are present in the front of the body.
Answer:
the cranial cavity
the vertebral cavity
Explanation:
i got it right
A stone tumbles into a mine shaft strikes bottom after falling for 3.8 seconds. How deep is the mine shaft
Answer:
70.8m
Explanation:
Given parameters:
Time of fall = 3.8s
Unknown:
Depth of the mine = ?
Solution:
To solve this problem, we use the appropriate motion equation as shown below;
S = ut + [tex]\frac{1}{2}[/tex] at²
S is the depth
u is the initial velocity = 0m/s
t is the time taken
a is the acceleration due to gravity
Now insert the parameters and solve;
Since u = 0;
S = [tex]\frac{1}{2}[/tex] at² = [tex]\frac{1}{2}[/tex] x 9.8 x 3.8² = 70.8m
Explain why an object floats on water. Use terms like buoyancy force and gravitational
force.
Answer:
If an object pushes out an amount of water equal to its own weight, the upward force acting on it will be equal to gravity - and the object will float.
Explanation:
The buoyant force has an impact on the object in the water and equals the weight of the water displaced by the object. Every object placed in water has some buoyancy force that pushes it against the gravitational force, and this means that any object loses weight in the water.
715 J of heat are transferred from
a 1.30 kg aluminum block to a
0.800 kg iron block. Find the
temperature change for the
aluminum
Aluminum
Iron or steel
c = 900 J/(kg*c)
c = 452 J/(kg"C)
(Unit = degrees C)
Answer:0.61
Explanation:
the answer is 0.61 because i just typed it into acellus abs it was right
Knowing that a 1.2-kg object weighs 12 N , find the acceleration of a 1.2-kg stone in free fall
what else is produced when sodium carbonate decomposes
Answer:
The chemical symbol for sodium carbonate is . The decomposition of sodium carbonate is: The decomposition of sodium bicarbonate, will result in the formation of sodium oxide, and carbon dioxide, . Hence, carbon dioxide, will produce with sodium oxide, on decomposition of
Hope this will help you