Answer:
The input power is 200 W
Explanation:
Motor Efficiency
The efficiency of a motor can be calculated as follows:
[tex]\displaystyle \beta=\frac{P_o}{P_i}[/tex]
Where:
β = efficiency
Po = Output power
Pi = Input power
Solving for Pi:
[tex]\displaystyle P_i=\frac{P_o}{\beta}[/tex]
The efficiency is β=0.75 and the output power is Po=150 W, thus the input power is:
[tex]\displaystyle P_i=\frac{150}{0.75}[/tex]
[tex]P_i=200 \ W[/tex]
The input power is 200 W
Two boys, Shrijan having weight 600N and Shrijesh having weight
300N are playing see-saw. If Shrijan is sitting at 2m from fulcrum,
where should Shrijesh sit from fulcrum to balance Shrijan?
Answer:
to be balanced moments should be equal
4m
Explanation:
[tex]fd = fd \\ 600 \times 2 = 300 \times x \\ \frac{600 \times 2}{300} = x \\ 4m[/tex]
Answer:
4m
Explanation:
fd=fd
600×2× x
300
4m ans
A car advertisement claims their car can go from a stopped position to 60 miles per hour in 5 seconds. The advertisement is describing the
car’s
Answer:
Acceleration
Explanation:
The advertisement is describing the acceleration of the car.
Acceleration is the rate of change of velocity per unit of time. It can be expressed mathematically as;
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Any quantity that specifies the rate of change of velocity of a body within a given time frame is describing its acceleration.
A radium atom has 88 protons and 226 neutrons. How many electrons does it have?
Answer:
No. of electrons = 88
Explanation:
Given that,
No. of protons = 88
No. of neutrons = 226
We need to find the number of electrons it have in a radium atom.
In an atom, the number of protons is equal to the number of electrons. There are 88 protons in this case.
Hence, there are 88 electrons in the radium atom.
Mechanical engineers generally work in all of the following EXCEPT
•marine biology.
•aerospace products.
•automotive industry.
•computers and electronics.
Answer:
•marine biology.
Explanation:
A mechanical engineer is a professional individual who ensures the design of a mechanical assembly as well as the monitoring of its realization. His role involves the manufacturing of a prototype and developing new products for the company. Responsible for manufacturing, he advises the company and customers and assesses the risks and techniques used for its development. Finally, he supervises the installation and the market penetration of the product, as well as its maintenance.
A mechanical engineer can collaborate with many useful and complementary professions such as designers or marketers, it ensures the appearance and technical operation of the product. It is a job under high responsibility with projects that can be large.
Finally, he can also work in the construction sector, in the automotive industry, biomechanics, shipbuilding, aerospace production and aeronautics, railways, mechanics and metallurgy, robotics, textile machinery, etc.
find mass when kinetic energy is 1.6 J and velocity is 0.2 m/s
Answer:
4kg
Explanation:
Given parameters:
Kinetic energy = 1.6J
Velocity = 0.2m/s
Unknown:
Mass of the body = ?
Solution:
The kinetic energy of a body is the energy due to the motion of the body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
1.6 = [tex]\frac{1}{2}[/tex] x 0.2 x v²
1.6 = 0.1v²
v² = 16
v = 4kg
which roots are better underwater , taprroots or fibrous?
Answer:
The absorption of water and minerals by taproot is more efficient with the taproot system. Fibrous root absorbs water more efficiently as it reaches deep into the soil. Taproots are capable of withstanding drought.
A skydiver has a mass of 65 kg.
Calculate the weight of the skydiver.
Un motociclista arranca desde el reposo y mantiene una aceleración constante de 0.14 m/s^2. Calcular: a) En que tiempo recorrerá una distancia de 1.3 Km/h b) Qué rapidez llevará en ese tiempo en m/s y en Km/h *
Answer:
[tex]136.28\ \text{s}[/tex]
19.08 m/s or 68.688 km/h
Explanation:
a = Aceleración = [tex]0.14\ \text{m/s}^2[/tex]
s = Desplazamiento = [tex]1.3\ \text{km}=1300\ \text{m}[/tex]
u = Velocidad inicial = 0
t = Tiempo empleado
De las ecuaciones cinemáticas obtenemos
[tex]s=ut+\dfrac{1}{2}at^2\\\Rightarrow 1300=0+\dfrac{1}{2}\times 0.14t^2\\\Rightarrow t=\sqrt{\dfrac{1300\times 2}{0.14}}\\\Rightarrow t=136.28\ \text{s}[/tex]
El tiempo necesario para recorrer una distancia de 1,3 km es [tex]136.28\ \text{s}[/tex]
[tex]v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 0.14\times 1300+0}\\\Rightarrow v=19.08\ \text{m/s}=19.08\times 3.6=68.688\ \text{km/h}[/tex]
La velocidad final del automóvil es 19.08 m/s so 68.688 km/h.
Hello boys and girls plz help me with this question ASAP
Thank you so much
Answer:
Blue
Explanation:
The colors of the rainbow are known by the acronym; ROYGBIV.
This is;
Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
From research, their respective wavelengths on the average are;
Red: 665 nm
Orange; 630 nm
Yellow; 600 nm
Green; 550 nm
Blue; 470 nm
Indigo; from 445nm to 464 nm
Violet; less than 400 nm
This means that from Red to Violet in that order, wavelength is decreasing in a descending order.
Now in refraction, the light with shortest wavelength will be bent the most while that with longest wavelength will be bent the least.
Thus, violet bends the most.
However, violet is not included in the options. So the next one that will bend the most after violet among the options given is Blue.
What is the difference between a mechanical wave and an electromagnetic wave?
A mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
A mechanical wave has a high frequency, while all electromagnetic waves have low frequencies.
A mechanical wave travels through matter, while an electromagnetic wave travels through empty space.
its regular chooiseing just decide one and tell me
Answer: A a mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
Explanation: A mechanical wave travels through empty space, while an electromagnetic wave travels through matter. A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
3 A jet fighter has a mass at take-off of 28 000 kg.
a)Its engines produce a force of 70 000 N. What
is its acceleration?
b) What is its acceleration if the force from the
engine is increased to 120 000 N?
Answer:
A. 2.5 m/s²
B. 4.29 m/s²
Explanation:
A. Determination of the acceleration.
Mass (m) = 28000 Kg
Force (F) = 70000 N
Acceleration (a) =?
Force (F) is simply defined as the product of mass (m) and acceleration (a). Mathematically, it is expressed as:
Force (F) = mass (m) × acceleration (a)
F = ma
Divide both side by m
a = F / m
With the above formula, we can obtain the acceleration as follow:
Mass (m) = 28000 Kg
Force (F) = 70000 N
Acceleration (a) =?
a = F / m
a = 70000 /28000
a = 2.5 m/s²
B. Determination of the acceleration.
Mass (m) = 28000 Kg
Force (F) = 120000 N
Acceleration (a) =?
a = F / m
a = 120000 /28000
a = 4.29 m/s²
(show work) WILL MARK BRAINLIEST!!
Which has a greater momentum, a 350kg car traveling at 20 m/s or a 400kg truck traveling at 17.5 m/s?
Answer: the formula for momentum is velocity times mass
car :
350 x 20 = 7000
truck:
400 x 17.5 = 3000
Ans : Car has a greater momentum
Explanation: Please mark Brainlest
Three rocks with masses of 1 kg, 5 kg, and 10 kg fall from the same height.
Which of the following describes the inertia of these rocks?
Where is the Long Head located?
Outside of the Arm
Inside of the Arm
On the Shoulder
Answer:
The biceps muscle is located at the front of your upper arm. The muscle has two tendons that attach it to the bones of the scapula bone of the shoulder and one tendon that attaches to the radius bone at the elbow. The tendons are tough strips of tissue that connect muscles to bones and allow us to move our limbs.
Explanation:
Glad i could help pls give brainliest and or thanks
Dr. Suarez walks 2.8 km north to get to an observation post, then walks 5.1 km south back to her outpost. Determine her distance.
A.) 2.3 km, north
B.) 7.9 km, south
C.) 7.9 km
D.) 2.3 km
Answer:
C.) 7.9 km
Explanation:
Distance and Displacement
An object who constantly travels for some distances at defined periods of time has a total distance as the sum of each individual distance the object traveled. It can be written as:
dtotal=d1+d2+d3+...+dn
This sum is obtained independently of the direction the object moves.
The displacement only takes into consideration the initial and final points of the path defined by the object in its moving. The displacement, unlike distance, is a vectorial magnitude and can be even zero if the object starts and ends the movement at the same point.
Dr. Suarez walks 2.8 km north and then 5.1 km south. The total distance is simply the sum of both distances: 2.8 km + 5.1 km = 7.9 km.
Note the distance does not have any direction (north or south), it's just the number.
Answer: C.) 7.9 km
Urgent Important!!
Many medications have a warning to avoid driving because.
A. they haven't been scientifically tested yet.
B. they have been proven to cause drowsiness.
C. they want to cover all their bases.
Answer:
B) they have been proven to cause drowsiness
Explanation:
B is the only answer that makes sense, as the other answers do not make sense. All medications are scientifically tested before they can be used by someone. Covering their bases would show negligence and is bad.
Hope this helps!
PS, this is biology or medical, not physics.
10.0 points
When you drop a 0.38 kg apple, Earth exerts
a force on it that accelerates it at 9.8 m/s’ to-
Ward the earth's surface. According to New-
ton's third law, the apple must
exert an equal but opposite force on earth. If the mass of the Earth is 5.98 x 10^24 kg, what is the magnitude of the Earth’s acceleration towards the apple? Answer in units or m/s^2
Answer:
6.2 ×10^-25
Explanation:
Ma = mg
a = (m/M)g
[tex]a = \frac{0.38}{5.98 \times {10}^{24} } \times 9.8 = 6.2 \times {10}^{ - 25} [/tex]
These data tables show the distance of various galaxies from Earth in millions of light-years (Mly) at different times. Which table supports the theory of expansion in the formation of the universe?
Answer: it’s b
Explanation:
I had two attempts to do the test first I picked c but I did it again it’s b .
What is the difference between a waves, amplitude, frequency and wavelength?
Answer: The amplitude or height of a wave is measured from the peak to the trough
Explanation: The wavelength is measured from peak to peak. Otherwise wavelength is directly related to the frequency of a given wave form
DEFINE SIGNIFICANT DIGITS.
Answer:
Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit. Calculate the number of significant figures for an assortment of numbers.
Explanation:
any of the digits of a number beginning with the digit farthest to the left that is not zero and ending with the last digit farthest to the right that is either not zero or that is a zero but is considered to be exact. — called also significant figure.
which wave lies adjacent to the low frequency portion of the visible spectrum
a. gamma rays
b. infrared
c. x rays
d. ultraviolet rays
Answer: b. infrared
Explanation:
The visible light with the smaller frequency is associated with the color red.
While the blue is the one with the larger frequency.
Now, as the name says, infrared waves are the ones with a frequency just below the one of the red visible light.
Where the frequency of the red light is something around (4.3*10^14 Hz)
and the frequency of the infrared waves is in the range between (10^12 Hz and 10^14 Hz)
Then the correct option is b, infrared.
A car engine has power than a horse because a car engine does the same amount of work in time. Yasmin and Raj each had 10 boxes of equal weight to stack next to each other on the same shelf, at the same height and in the same arrangement. Yasmin completed the task in 2 minutes, while Raj took 3 minutes to stack his boxes. Raj applied power than Yasmin because his stacking took time to do the same amount of work.
Answer:
A car engine has more power than a horse because a car engine does the same amount of work in time. Yasmin and Raj each had 10 boxes of equal weight to stack next to each other on the same shelf, at the same height and in the same arrangement. Yasmin completed the task in 2 minutes, while Raj took 3 minutes to stack his boxes. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.
Explanation:
A car engine has more power than a horse because a car engine does the same amount of work in less time. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.
What is power?The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.
Energy divided by time represents the dimension of power. The watt (W), which equates to one joule per second, is the unit of power in the International System of Units (SI).
Another popular unit of measurement is horsepower (hp), which is equivalent to a horse's power; one mechanical horsepower is equal to around 745.7 watts.
Learn more about power here:
https://brainly.com/question/29575208
#SPJ5
A boy starts from point A and walks 3 meters toward the south, then turns around and walks 7 meters toward the north. What is the boys placement from point A?
Answer:
-3m+7m = 4m
Explanation:
As he walks south, he is going down 3m (-3m). Then he walks up 7m (+7m).
You subtract the final position from the initial position to get displacement.
7m - 3m = 4m
There are 30 students in Ms. Andrews’ fourth grade class. There are 6 times as many students in the entire fourth grade as there are in Ms. Andrew’s class. Which equation can be used to determine the number of students, n, in the entire fourth grade? *
6 x n = 30
6 + 30 = n
30 x 6 = n
30 ÷ n = 6
Answer:
30×6=n
Explanation:
30 students in her class× 6 = number of students in the entire 4th grade.
Write a hypothesis about the effect of the red light on the population. Use the "if . . . then . . . because . . ." format, and be sure to answer the lesson question: "How does natural selection change the phenotypes within a population over time?"
.............they literally didn't talk about this in class.........
Answer:
yes because if red light was natural then it should cause more damage because that how it is
Answer:
its yes because if red light was natural then it should cause more damage because that how it is
The middle-C hammer of a piano hits two strings, producing beats of 1.60 Hz. One of the strings is turned to 250.00 Hz. What frequencies (in Hz) could the other string have? (Answer to the nearest 0.1 Hz.)
Answer:
248.5Hz or 251.5Hz
Explanation:
Given :
Beat frequency, Fbeat = 1.5 Hz
Frequency of string 1, f1 = 250 Hz
Frequency of string 2, f2 =?
Recall:
Fbeat = |f1 - f2|
1.5 = 250 - f2
f2 = 250 - 1.5
f2 = 248.5 Hz
OR
- Fbeat = |f1 - f2|
- 1.5 = 250 - f2
f2 = 250 + 1.5
f2 = 251.5 Hz
Hence, the two possible frequencies of the other string are 248.5Hz or 251.5Hz
While swimming the elementary backstroke your eyes should be looking directly at..
Answer:
the ceiling
Explanation:
i dont know man but thats what my swimming instructor said, but i havent swam in like 3 years so ..
A student conducts an experiment in which an object travels across a horizontal surface while for 2 s a net force is applied to a 2 kg object that initially travels with a speed of 0.5 m/s. Data collected from the experiment are used to create the graph of the magnitude of the applied force exerted on the object as a function of time is shown. All frictional forces are considered to be negligible. Can the student use the graph and the known data to determine the momentum of the object after the force has been applied?
Yes, because the average force exerted on the object can be used with the time interval of 2 s to determine the change in momentum of the object by using Δp⃗ =F⃗ Δt.
Yes, because the area bound by the best-fit line and the horizontal axis from 0 s to 2 s can be used to determine the change in momentum of the object.
No, because the data is too scattered to determine the average force that is exerted on the object.
No, because the student needs to know the direction that the force is applied to the object because the applied force will be in the same direction as the change in momentum of the object.
Answer:
D. No, because the student needs to know the direction that the force is applied
Explanation:
The change in momentum depends on the direction of the force as well as its magnitude. Since the graph only supplies force magnitude information, it is insufficient to allow the student to calculate the change in momentum.
Ifa truck starts from rest and it has acceleration of 4 m/s for 5 second
calculate its final velocity. What will be the distance travelled by the track
during the time interval?
Answer:
Distance 50m
final velocity 20ms^-1
[tex]s = ut + \frac{1}{2} a {t}^{2} \\ = 0 \times t + \frac{1}{2} \times 4 \times {5}^{2} = 50m[/tex]
[tex]v = u + at \\ v = 0 + 4 \times 5 \\ v = 20ms^{ - 1} [/tex]
Select the correct answer. Which of the following is a category of dance? O A. Group dance OB. Solo dance O C. Partner dance OD. All of the above. NEED HELP PLEASE! Due today!!!!!!!!!!!
Answer:
all of above I think sorry if I'm not right but I tried
Answer: d
Explanation: