Explanation:
Efficiency is defined as the ratio between the useful output over the total amount consumed. [tex]E = \frac{useful}{total}[/tex]
The fan does 500W of useful work while wasting 300 W. The total power consumption is 800 W (500 + 300).
A kettle transfers 6000 J of energy electrically. 1500 J of this is wasted. What is the efficiency of this kettle?
Answer:
Effi = 75 %
Explanation:
That is, the 6000 [J] is electrical energy that is transferred to the liquid, of that amount of energy 1500 [J] is dissipated or lost.
That is, from that amount of energy the difference between the energy that is supplied and the one that is lost is the energy that absorbs the liquid in the kettle.
[tex]Q=6000-1500\\Q=4500[J][/tex]
That is 4500 [J] enter the liquid that is heated.
Efficiency can be calculated as the amount of energy that the liquid receives over the energy that is supplied.
[tex]Effi = 4500/6000\\Effi = 0.75[/tex]
What should #1 be labeled?
A. magnetic field line
B. north pole
C. electron
D. magnetic domain
Identify the cause of temperature fluctuations recorded in both New York and Los Angeles
Answer:
In New York City, weather observations have been taken in Central Park dating back to 1868. In the 150 years of records the city’s temperature extremes span 121 degrees ranging from a high of 106 on July 9, 1936 to a low of minus 15 on February 9, 1934. In Los Angeles temperatures have been taken at a downtown location since 1877 and extremes there range from a high of 113 on September 27, 2010 to a low of 28 degrees recorded on three occasions, most recently January 4, 1949, an 85-degreee range.
Explanation:
'm pretty sure that's the answer to your question.
which one thank youuu!
Answer:
the answer is 10n to the left. option B
Explanation:
when two sides are parallel to each other you subtract
for example
f1+f2=R2
30n-20n=10n
Which objects will likely have the greatest gravitational force between them?
a. Two tennis balls that are near each other
b. Two soccer balls that are near each other
c. Two tennis balls that are touching each other d. Two soccer balls that are touching each other
Answer:
d. Two soccer balls that are touching each other
Explanation:
Let [tex]m_1[/tex] be the mass of a tennis ball, [tex]m_2[/tex] is the mass of a soccer ball.
As the mass of a soccer ball is more than the mass of a tennis ball, so
[tex]m_2 > m_1[/tex]
Let [tex]d_1[/tex] be the distance between the centers of both the balls near each other and [tex]d_2[/tex] be the distance between the centers of both the balls touching each other.
So, [tex]d_2 > d_1[/tex]
The gravitational force, F, between the two objects having masses M and m and separated by distance d is
[tex]F=\frac{GMm}{d^2}[/tex]
Where G is the universal gravitational constant.
As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them, so selecting the larger mass ([tex]m_2[/tex], soccer ball) separated by a lesser distance ([tex]d_2[/tex], touching) to get more gravitational force.
Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.
Hence, option (d) is correct.
Answer:
Two soccer balls that are touching each other
Explanation:
I got it right on the test.
All waves that travel through matter are called
kg. m
A tennis player hits a ball and gives it a change in momentum of 3.3 over 5.0 ms.
S
What is the magnitude of the net force on the tennis ball?
Answer:660
Explanation:
What is the force that causes objects to move in circles?
Answer:
centripetal force.
Explanation:
Answer:
centripetal force - force directed toward the center of a circle,
causes an object to move in a circle.
Explanation:
Have a gooood day!
Calculate the total distance you traveled, if:
You left home at 10 a.m. and walked 500 m to a friend's house. At 11, you
all drove 5 km to the mall.
At 1:30, your friend drives you 4 km to your house. The total distance you
traveled, round trip, is
Answer:
9.5km
Explanation:
To solve this problem, we add the distances given together.
The distance is the sum of the length of path covered. It is a scalar quantity and has only magnitude but no directional attribute.
Distance walked to friend's house = 500m
Distance to mall = 5km
Since 1000m = 1km, 5km will be 5000m
Distance back to house = 4km
In m, this gives 4000m
So;
Total distance covered = 500m + 5000m + 4000m = 9500m
Since 1000m = 1km;
Then, 9500m will given 9.5km
An object experiences an acceleration of 8.5 m/s^2 over a distance of 300 m. After that acceleration it has a velocity of 400 m/s. What was its velocity before being accelerated? *
Answer:
393.6m/s
Explanation:
Given parameters:
Acceleration = 8.5m/s²
Distance = 300m
Final velocity = 400m/s
Unknown:
Initial velocity = ?
Solution:
To solve this problem, we use the expression below;
v² = u² + 2as
v is the final velocity
u is the initial velocity
a is the acceleration
s is the distance
So;
v² - 2as = u²
u² = v² - 2as
u² = 400² - (2 x 8.5 x 300)
u = 393.6m/s
Given parameters:
Acceleration = 0.0m/w
Initial velocity = 0m/s
Final velocity = 00m/s
Unknown:
Distance traveled = ?
Solution:
To solve this problem, we use the expression below:
q0 = y + 0w
W is the final velocity
Y is the initial velocity
C is the acceleration
P is the distance
0² = 0² + (0 x 0.0 x S)
000 = 00.0S
S = 0m
Lots of points! Will mark brainliest!!
1. How much force will be needed to move a 110kg box across the floor if the coefficient of friction is
0.40?
2. If the coefficient of friction is lowered to 0.25, but the same amount of force was applied, what would the acceleration of the object in problem #1 be?
Answer:
1. 431.2newtons
2. 1.47meters per second squared
Explanation:
f=ma
force of friction=normal force×coefficient of friction
normal force = mass× gravity
1.
nf=110kg × 9.8m/s^2 = 1078newtons
f=nf×cf
f=1078×.4=431.2
1
f=1078×.25=269.5
431.2-269.5=161.7
161.7=110kg× a
a=1.47
The amount of friction depends on the weight of the objects pressing together.
Answer:
The amount of friction depends on the force pushing the surfaces together. If this force increases, the hills and valleys of the surfaces can come into closer contact. The close contact increases the friction between the surfaces. Objects that weigh less exert less downward force than objects that weigh more.
Explanation:
Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
For which part of the body is Doppler ultrasound most likely to be used in
imaging?
O A. The circulatory system
B. The large and small intestines
C. A broken leg
D. A tumor
Answer: The answer is A! The Circulatory system.
Explanation:
Answer:
A
Explanation:because its right and i just did it hope this helps please mark me
The time of flight for an object thrown from the rooftop of a tall building is 6.2 seconds. In terms of the initial launch velocity v,
and the angle of launch o, what equation gives you the maximum displacement of the object?
Answer:
B . x= v*cos ∅* 6.2
Explanation:
Time of flight of a projectile motion is the time taken by the object to reach the surface from when it was projected.
In this case ;
Initial launch velocity = v
Angle of launch is =∅
Time of flight = 6.2 seconds
The formula for time of flight is;
T= 2*v*sin∅ / g
At time t the displacement components for x and y are;
x= v* t * cos ∅ ----------------i
and
y =u* t * sin ∅ - 1/2 g*t² ------------ii
Taking equation i for displacement of the object in the x component
x = v* t* cos ∅
x = v * cos ∅ * 6.2
x = 6.2* v * cos ∅
An airplane flying horizontally at 130.0 m/s drops a crate of food from a height of 2750. m. How far in front of the target must the bomb be released?
Answer:
The crate should be released 3,080 m in front of the target
Explanation:
Horizontal Launch
When an object is thrown horizontally with a speed v from a height of h, it describes a curved path ruled by gravity until it hits the ground.
The range or maximum horizontal distance traveled by the object can be calculated as follows:
[tex]\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}[/tex]
The airplane drops a crate horizontally from a height of h= 2,750 m when flying at v=130 m/s. The range or maximum horizontal distance the crate reaches is:
[tex]\displaystyle d=130\cdot\sqrt{\frac {2*2,750}{9.8}}[/tex]
Operating:
[tex]\displaystyle d=130\cdot\sqrt{561.2245}[/tex]
d = 3,080 m
The crate should be released 3,080 m in front of the target
please help
1. Describe the difference between an "object" and a "system"
2.Give an example of a system with at least three objects.
3. What is meant by "the energy of the system?"
4. Give an example of energy moving from one object in a system to another object in the system.
Answer:
A class is a blueprint from which you can create the instance, i.e., objects. An object is the instance of the class, which helps programmers to use variables and methods from inside the class. A class is used to bind data as well as methods together as a single unit. Object acts like a variable of the class.include transport systems; solar systems; telephone systems; the Dewey Decimal System; weapons systems; ecological systems; space systems; etc. Indeed, it seems there is almost no end to the use of the word “system” in today's society.One of the thermodynamic properties of a system is its internal energy, E, which is the sum of the kinetic and potential energies of the particles that form the system. The internal energy of a system can be understood by examining the simplest possible system: an ideal gas.A swinging pirate ship ride at a theme park. Kinetic energy is transferred into gravitational potential energy.A boat being accelerated by the force of the engine. The boat pushes through the water as chemical energy is transferred into kinetic energy.
Bringing water to the boil in an electric kettle.
Daniel steps on the gas pedal of his car, and the engine increases its performance from zero to 2700 rpms (rotations per minute). What are the frequency and period?
[Hint: frequency is cycles per second]
Explanation:
The frequency of the engine is given by :
[tex]f=\dfrac{rpm}{60}[/tex]
We have, the engine increases its performance from zero to 2700 rpms.
Frequency,
[tex]f=\dfrac{2700}{60}\ \text{cycles per second}\\\\f=45\ \text{cycles per second}[/tex]
The time period of the engine is given by :
T = f/f
So,
[tex]T=\dfrac{1}{45}\ s\\\\T=0.023\ s[/tex]
Hence, the required frequency and the period is 45 cycles/second and 0.023 seconds respectively.
I am really confused. Any help?
3.00 x 0.68= 2.04
To find magnification, you multiply your object by the factor
Answer:
I believe it's A
Explanation:
A boy rides a sled down a steep, snow.covered hill. Which of
the following takes place during the child's ride?
a
Potential energy decreases and kinetic energy
increases.
Need a Hint?
b
Potential energy increases and kinetic energy
decreases
c Both kinetic and potential energy increase.
Answer:
a. Potential energy decreases and Kinetic energy increases
Explanation:
Because as he comes down due to its steepness the speed of the boy or you can say his KE increases and since he comes from a high position (hill) to the lower ground his potential energy decreases simultaneously
Answer:
Potential energy decreases and kinetic energy increases.
Explanation:
That was the answer on my CK12
if earth were a ping pong what size ball would jupiter be
Answer:
a large beach ball
Explanation:
Help with 15 - 17 please!
Answer:
15 - 17 is -2
Explanation:
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.
A beam of red light has a wavelength of 713 nm. What is the frequency?
Which best describes the particles in a solid? Multiple choice question. cross out A) close together and moving freely cross out B) far apart and moving freely cross out C) close together and vibrating in place cross out D) far apart and vibrating in place
Answer:
C) close together and vibrating in place cross out
Explanation:
Solid, liquid and gas are the three types of matter. In solid, the molecules are tightly packed together. The intermolecular forces is very strong and the particles do not move from one place to another. The particles are so closely packed that they move at their own place and vibrate forth and back. The motion of the movement of the particle and its force are the two factors that help in determining the state of matter.
Which 2 statements correctly describes the theory of plate tectonics?
Answer:
B and D
Explanation:
If it has letters.
What type of system is best used to observe conservation of mass because all of the mass stays in one place?
a balanced system
a sideways system
a closed system
an open system
Answer:
trump
Explanation:
yee hawww
Answer:I think a closed system
Explanation:
Please help! Timed! I would really appreciate it ill try to give brainliest!
Amy doesn't want to be late for class so she rushes to McDonalds at lunch. How much time would it take Amy to walk 2km to the restaurant for an apple pie if she walked at a rate of 4.5km/h? *
.44 m/s
.44 hr or 26.6 minutes
.44 hr/m or 2.66 minutes
Answer:
i believe it is .44 hr o26.6!
Explanation:
atoms giving up valence electrons indicates that an ionic bond is present ture or false
Answer: true
Explanation:
please answer WILL GIVE BRANLIEST
This scenario is directly related to the Inertia of direction, which states that an object will stay moving in the same direction unless a force acts on it.
If you need to add more to the answer above, you can probably say something about how the sudden change in direction will cause your body to want to continue on in the direction it was originally going, so the car veering suddenly will cause you to be violently pulled in it's direction.
I like to think of it like a car crash, the reason why head-on collisions are so deadly are because the car will halt but your body will continue moving at the same speed the car was going.
That's my best guess. Hope this helps! :)
what is damping??????
Answer:
the picture is the definition
