Answer: B
Explanation: efficiency is the useful energy supplied; useful energy supplied doesn't not change,
work done stays constant
in order to to increase the power of the motor, time would have to be decreased to get the wanted result..
When he increases the input power to the motor and repeats the experiment, work done stays the same but time taken decreases.
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.
A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft.
To lift a load through a vertical distance of 2.0m, in the both cases same amount of work-done happens because the displacement is same.
But as the input power, in second case, increases but the efficiency of the motor does not change, the time taken decreases ( as time taken = work done/power)
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help plzz i nned to do this
Hello!
Answer:
The answer is D
Wish you luck!
Using the velocity versus time graph, what was the average acceleration of the object during segment B?
a) 0 m/s/s
b)20 ms/s
c) 10 m/s/s
d) 5 m/s/s
Answer:
the answer is B 20 ms/s
Explanation:
N/A
Thus the for the given velocity versus time graph the average acceleration of the object during segment B is 0 m/s/s.Hence, option A is the correct option.
Average acceleration- Acceleration is defined as the rate of change of acceleration. Average acceleration for an interval can be defined as the rate of change of velocity for that interval per time.
Let [tex]\Delta v[/tex] be the change in velocity and [tex]\Delta t[/tex] be the change in time in a given time interval. Then average acceleration is,
[tex]a= \dfrac{\Delta v}{\Delta t}[/tex]
At segment B, It starts at 4.5 seconds and ends at 10 seconds. The total time interval for this segment is 5.5 seconds.Therefore,
[tex]\Delta t=5.5[/tex]
Now the change in velocity for segment B. In segment B the velocity does not change at any point and keeps the value of 20 m/sec at the time interval.
According to the definition of the average acceleration when an object is changing its velocity (whether by a constant amount or a varying amount) then it is an accelerating object. And an object with a constant velocity is not accelerating.
Thus the for the given velocity versus time graph the average acceleration of the object during segment B is 0 m/s/s.Hence, option A is the correct option.
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When you throw a sheet of paper and a stone from a certain height under what condition will the two fall to the ground at the same time?
Answer:
when there is no resistance.( in a vacuum)
Explanation:
this is because of acceleration due to gravity that is equal on both objects.
What is the volume of the shape below?
Help me plzzzz
Answer:
20cm
Explanation:
2 × 5 × 2 = 20
Hope this helps.
What is the difference between propagation speed and the frequency of a wave? Does one or both affect wavelength? It so, how?
Participating in physical activity can help to reduce stress in all of the following ways except: a. it releases stored energy b. it causes fatigue and exhaustion c. it releases tension d. it relaxes muscles please select the best answer from the choices provided. a b c d
Participating in physical activity can help to reduce stress in all of the following ways except it causes fatigue and exhaustion. Option b is correct.
What is physical activity?Anybody movement requiring energy expenditure that is produced by skeletal muscles is defined as physical activity. Physical exercise encompasses all forms of movement,
Whether it is done for fun, to go to and from locations, or as part of one's job. Physical activity, both moderate and strenuous, is beneficial to one's health.
Physical activity is good for your heart, body, and mind. Physical exercise aids in the prevention and treatment of noncommunicable illnesses including heart disease, cancer, and diabetes.
Depression and anxiety symptoms are alleviated by physical activity. Physical activity improves one's ability to think, learn, and judge.
Participating in physical activity can help to reduce stress in all of the following ways except it causes fatigue and exhaustion.
Hence option b is correct.
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Answer:
b
Explanation:
did on edge
Scientists think that birds and other animals, such as sea turtles, may use Earth’s magnetic field to help them navigate. Research which animals might find their way using Earth’s magnetic field and investigate the evidence scientists have found that supports the idea. What would happen to the animal if Earth’s magnetic field were reversed?
Answer:
Magnetoreception (also magnetoception) is a sense which allows an organism to detect a magnetic field to perceive direction, altitude or location. This sensory modality is used by a range of animals for orientation and navigation, and as a method for animals to develop regional maps
A 2.0 Kg box is being pulled up a ramp with a force of 25.0 Newtons. The ramp has an incline of 30 degrees. If the coefficient of friction is 0.752, find the acceleration of the block up the ramp. You may round your answer to the nearest tenth where necessary!!!
Answer:
The acceleration of the block is 1.21 m/s².
Explanation:
Given that,
Mass = 2.0 kg
Force = 25.0 n
Angle = 30°
Coefficient of friction = 0.752
We need to calculate the acceleration of the block
Using balance equation
[tex]F-(mg\sin\theta+\mu mg\cos\theta)=ma[/tex]
Put the value into the formula
[tex]25-(2.0\times9.8\sin30+0.752\times2.0\times9.8\cos30)=2.0a[/tex]
[tex]a=\dfrac{25-(2.0\times9.8\sin30+0.752\times2.0\times9.8\cos30)}{2.0}[/tex]
[tex]a=1.21\ m/s^{2}[/tex]
Hence, The acceleration of the block is 1.21 m/s².
How does the star’s apparent brightness change over time?
The closer light source will appear brighter. In other words the closer the stars are the brighter they will be. Also The darker the sky is the more you will see the stars.
If a train travels 300m in 25 ,how fast is it going
Explanation:
distance= 300m t= 25s
speed= distance/time
speed= 300/25
speed = 12ms^-1
it will go 100m In 25, bc a train is fast so it will a 100 as twice
Explanation:
So make sure you have the answer please
What is the mass of an object with a velocity of 24.1 m/s and a momentum of 28.3 kg m/s?
Answer:
1.17427...kg
Explanation:
Assumptions: no friction, no air resistance, no internal resistance, and it is 1 dimensional travel for velocity.
p=mv, where p is momentum, m is mass, and v is velocity
28.3=24.1(m)
divide both sides by 24.1
you get 1.174273859
Answer:
[tex]\boxed {\tt 1.17427386 \ kilograms}[/tex]
Explanation:
The formula for momentum is:
[tex]p=mv[/tex]
From this formula, we know that mass can be found by dividing the momentum by the velocity.
[tex]\frac{p}{v}=m[/tex]
The momentum is 28.3 kg m/s and the velocity is 24.1 m/s
[tex]p=28.3 \ kg \ m/s \\v=24.1 \ m/s[/tex]
[tex]\frac{28.3 \ kg \ m/s }{24.1 \ m/s} =m[/tex]
Divide. The meters per second or "m/s" will cancel each other out.
[tex]\frac{28.3 \ kg}{24.1} =m[/tex]
[tex]1.17427386 \ kg=m[/tex]
The mass of the object is 1.17427386 kilograms.
Which characteristic describes an organism of Kingdom Animalia when compared to plants?
A) It is able to move on its own.
B) Sunlight is used to make its own food.
C) Water is not needed for survival.
D) It does not need sunlight to survive.
Answer:
A
Explanation:
Because plants cant move and animals can.
The characteristic which describes an organism of kingdom Animalia is able to move on its own when compared to the plants kingdom. Thus, the correct option is A.
What are the characteristics of Animalia Kingdom?Animals are the multicellular, eukaryotic organisms in the biological kingdom Animalia. Animals are the organisms which consume organic material, breathe oxygen gas, are able to move on their own, can reproduce sexually and produce organisms which contain genetic information which is recombination of both the parents, and these organisms go through an ontogenetic stage in which their body consists of a hollow sphere of the cells, the blastula, during the embryonic development of organisms.
Organisms belong to Animal kingdom show some characteristics which are not found in the organisms which belong to the plant kingdom including movement. Animals can move on their own while plants cannot.
Therefore, the correct option is A.
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Rebecca and John take their daughter to Disney World. When they asked their daughter two years later if she remembered going she answered no. At the time of the trip to Disney World, the couple's daughter was MOST likely _____ years of age
Answer:
3
Explanation:
1-3 age is hard to remember
Jalen is sliding around on his kitchen floor in his
socks going 3m/s. He gets to the living room, and
when he slides onto the carpet, his velocity slows
down to 1m/s. He also notices that his feet feel
warmer. Why did this happen? Explain your
answer.
Answer:
his feet feel warmer because of friction. when friction takes place then an object will warm up because friction is a universal law that always takes place. if you rub your hands together, you also experience the heat of frictional I hope that helped.
Humpback whales are known to produce a collection of elaborate
and repeating sounds with frequencies ranging from 20 Hz to 10 kHz. The sound
waves travel through water at speeds of approximately 1400 m/s. Determine the
wavelengths of the waves at the lower and the upper end of this frequency
range.
Answer:
70 m.
Explanation:
Given,
Frequency, f = 20 HZ
speed of sound, v = 1400 m/s
wavelength of the waves = ?
we know,
v = f λ
Hence, the wavelength of the wave is equal to 70 m.
50 points for correct answer.
How many Protons does Na (sodium) have
O 23
O 12
O 13
O 11
What happens to particle movement/speed when energy is added to a phase?
A drag racer starts from rest and accelerates at 10 m/s squared for the
entire distance for 5.4 seconds. What is the velocity of the car at the end
of the race?
Answer:
54 [tex]\frac{m}{s}[/tex]
Explanation:
[tex]v=u+at[/tex]
where [tex]u=[/tex]initial velocity
[tex]v=0+(10\frac{m}{s^{2} } )[/tex]×[tex](5.4s)[/tex]
[tex]v=54\frac{m}{s}[/tex]
When you have been swimming swimming and you come out of the pool, you may feel cold. Use your understanding of endothermic processes to explain why.
Explanation:
Edothermic process is the absorbtion of heat.
It is the opposite of exothermic process which is the release of energy. In edothermic process thermal energy is absorbed from the surrounding
________ is a force which is exerted by earth on the objects *
Answer:
force of gravity
Explanation:
i hope this helps and learn well
Somebody plz answer both these questions correclty thanks!!!!!
(WILL MARK BRAINLIEST) promise :)
:D
Answer:
Which questions do you need help on?
what do you mean by electric wind?
Explanation:
The electric field is normal to any conductor charged surface, then any negatively charged sharp end will concentrate the electrons in order to achieve that (being rejected by the others on main body), that also implies a huge voltage drop nearby the edge, meaning high electric field in the direction aimed by the sharp end, that field becomes strong enough (when charged by electrostatic machines) to propel electrons out causing air movement in that direction (a flame will bend because of that wind).
Ion wind, ionic wind, coronal wind or electric wind is the airflow induced by electrostatic forces linked to corona discharge arising at the tips of some sharp conductors (such as points or blades) subjected to high voltage relative to ground. Ion wind is an electrohydrodynamic phenomenon
Hi, by the ways happy Halloween , I hope this really helps
What color of visible light has the highest energy?.
A 1500 kg car is moving at 15m/s what is the impulse experienced by the car
*Pls put the formula of how you did it too*
Answer:
22500 Ns
Explanation:
Given,
Mass ( m ) = 1500 kg
Velocity ( v ) = 15 m/s
Formula : -
Impulse = mv
Impulse
= 1500 x 15
= 22500 Ns
Therefore,
22500 Ns is the impulse experienced by the car.
Note : -
Ns is the unit of impulse.
One of the most important tasks of the small intestine is
the:
a. absorption of nutrients
b. collection of water
C. excretion of urine
d. repair of blood cells
F
F
A
a
a
F
F
F
D
E
Order greatest to least
Answer:
E B D A C F
Explanation:
Answer:
E B D A C F
Explanation:
what’s an example of Newton’s 3rd law of motion?
Answer:for ever reaction there is an equal and opposite reaction
Explanation:
Answer:
, when you jump high, your legs apply a force to the ground.
Explanation:
A ball is thrown straight up. As it is rising
Answer:
B.
Explanation:
When a ball is thrown vertically upward, the acceleration due to gravity always acts downward to the ball. When the ball is moving up the acceleration due to gravity will decrease
hope thats right!
predict the long term cost and benefit of using renewable or non renewable resources. please help will give brainliest
Answer:
The long term cost and benefit of renewable resources is that it is most likely a one-time purchase kind of thing. For example, if you use solar energy, you only have to buy the solar panels for your roof once. However, if you use gas oil to cook, you have to keep buying since it runs out. Sunlight doesn't run out.
The long term cost and benefit of non renewable resources is that it is something you can profit off of very easily. It will take a lot of time for people to completely switch over to renewable resources, so it is something that can steadily bring in money. Examples of non renewable resources that people constantly use is oil, gas, coal, etc.