B. Which of these uses the most power? Explain your answer.
1) 160 J of work in 8 seconds
2) 80 J of work is 4 seconds
3) 180 J of work in 9 seconds

Answers

Answer 1

Answer:

p=w/t

160/8=20

80/4=20

180/9=20

...so..all these uses equal power


Related Questions

A 1000 kg car’s velocity increases from 5 m/s to 10 m/s. What is the change to the car’s kinetic energy? Show your work.

Answers

Answer:

k. e. = 1/2 mv^2

1/2 * 1000 * (5)^2

1/2 * 1000 * 25

12500 joules

k. e. = 1/2 mv^2

1/2 * 1000 * (10)^2

1/2 * 1000 * 100

50000

change in k. e. = final - initial

50000 - 12500

= 37500 joules

hope it helps you

Plants appear green because they do not absorb the green wavelengths of light. What happens to those green light waves when they hit a plant? The are diffracted. They are absorbed. They are reflected. They are refracted.

Answers

Answer:

They are reflected.

Explanation:

Red light is absorbed while green light is reflected, causing the color to be green in human eyes.

Answer:

C

Explanation:

14. How do speed and velocity differ?

Answers

Answer:

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.

Explanation:

An apple in a tree has a mass of 0.21 kg. If it is 7.2 meters above the ground, how much potential energy does it have?

Answers

Answer:

14.8J

Explanation:

PE=MGH

M=0.21

G=9.8m/s

H= 7.2 m

0.21x7.2x9.8= 14.8176 J

An object completes 10 cycles in 50s.
a. What is the period of its rotation?
b. What is the frequency of its rotation?

Answers

Answer:

.

Explanation:

Explanation:

Given parameters:

Number of cycles  = 10cycles

Time taken  = 50s

Unknown:

Period of its rotation  = ?

Frequency of its rotation  = ?

Solution:

The period of rotation is the time taken time taken for a body to complete a number of rotation;

 Period  = [tex]\frac{t}{n}[/tex]  

t is the time

n is the number of cycles

 Period  = [tex]\frac{50}{10}[/tex]  = 5s

The period is 5s

Now, frequency is the inverse of period;

   F = [tex]\frac{1}{period}[/tex]  = [tex]\frac{1}{5}[/tex]   = 0.2Hz

A term used to describe a critical assessment of how an athlete acts and what they achieve either during a match or while training is known as:
A. SMART Target
B. Area of improvement
C. Performance analysis
D. Measurement of success

Answers

Answer:

I believe D

Explanation:

I'm not for sure but I think it is D

identify the types of simple machine given below .
a)scissors b)axe c)driller

Answers

Answer:

there should some picture to identify right?

pls edit your question and insert the picture..

Answer:

Well it depends Because An axe Would be A Simple machine well as a drill is

What does anaerobic mean?
A. Short bursts of energy
B. Without oxygen
C. Intense physical output
D. With oxygen

Answers

Answer:

without oxygen because

Answer:

Without oxygen

Explanation:

A Force that does not change an object velocity

Answers

Answer:

I think ur wrong to say force doesn't change an object velocity

Explanation:

Force affects how objects move. They change the direction of motion of an object that is already moving. Since force causes a change in the speed or direction of an object, we may say that force causes changes in an object velocity.

Tom drives on a highway and never changes his speed for the whole journey. He drives for 300 miles and it takes him 5 hours. What is Tom's speed on the highway?

Answers

Answer:

QESARDFRGTSRTATFREVERSRvrvqwqv

Explanation:

vfqfvcafbraf w rfdsd AEWvd a

If you and your friend are playing tug of war and both are you are pulling with the same amount of force. What will happen?

Answers

Answer:

Nothin will move, it will stay the same since no force is greater than the other. it's "the same amount of force" which also means an equal amount of force

Explanation:

The forces are only equal if there is no acceleration (which in the game of tug of war, accelerating yourself and your opponent is the idea). If the force on the rope and the ground are both equal either nothing moves or some other force is being applied in the system.

Hope this helped!

What causes the electrons to move in the “Electromagnetic Induction” animation?
a.
Current
c.
Changes in magnetic field
b.
Voltage
d.
Kinetic energy


Please select the best answer from the choices provided

A
B
C
D

Answers

Answer:

Change in the magnetic field

Which statement about the relationship between air pressure and air density is accurate?

A) Air pressure decreases as air density increases
B) Air pressure increases as air density increases
C) Air pressure increases as air density decreases
D) Air pressure is unrelated to air density

Answers

Answer:

A: Air pressure decreases as air density increases

Explanation:

Pressure is a force exerted on or against an object by being in contact with a substance. Thus, air pressure is due to the bombardment of the air (gas) particles with a surface. Density is defined as the mass per volume of a substance. Thus, air density is defined as the mass of air per unit volume.

If that Explanation does not make any sense let me make it easier.

The air at the top of a mountain is cooler than the air at the bottom. This temperature difference is due to a phenomenon that occurs in Earth’s atmosphere. Air rises and sinks based on differences in temperature and pressure. Here’s a quick experiment that will help explain the role of pressure.Take in a deep breath as if you were ready to blow out birthday candles. Puff your cheeks with air like a chipmunk. Hold it for a few seconds, and then blow the air slowly from your cheeks.Cold air sinks while warm air rises because cold air is denser than warm air. When a lot of cold air sinks, it creates an area of high air pressure where it hits the surface. This high-pressure air flows to an area of low pressure, creating wind. When this air warms, it rises up into the atmosphere.Temperature decreases as altitude increases. That’s why a mountain peak may be covered with snow while the bottom of the mountain is full of green plants and trees. When warm air rises into the atmosphere, it cools. The density of the air increases as it cools, which eventually creates an area of high pressure and starts the cycle again.

If not for this phenomenon of air rising and sinking in the atmosphere, there would be no wind or weather.

I hope that helped!

how can an object travel 6 meters if it ends up at -2 on the number line?)

Answers

Answer:  Distance is a scalar quantity and direction is not applicable.  We can use graphs to depict an object's change in position over time.  Create a large number line in the classroom by taping index cards on the floor or wall 1 meter apart.

Explanation: I really hope that was helpful.

In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees. By 2017, the area covered by trees was reduced to 300,000,000 hectares. What is the percentage decrease in the area covered by trees between 1630 and 2017?

Answers

Answer:

29.41%

Explanation:

Given that,

In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees.

By 2017, the area covered by trees was reduced to 300,000,000 hectares.

We need to find the percentage decrease in the area covered by trees between 1630 and 2017.

The percentage decrease in any value is given by :

[tex]\%=\dfrac{300,000,000 -425,000,000 }{425,000,000 }\times 100\\\\=29.41\%[/tex]

So, the percentage decrease in the area covered by the trees is 29.41%.

A 150 lb person and a 200 lb person run into each other.

What can you say about force?

Who accelerated the most? Why?

Answers

the 150lb person as they weigh less than the other

Explanation:

1. Force is something that pushes or pulls you

2. The 150 lbs person accelerated faster because they had less force pushing or pulling them down.

The international space station travels 110,304 km in 4 hours. What is
speed of the ISS in Meters per second. (3600 seconds = 1 hour)

Answers

Answer:

7660 m/s

Explanation:

multiply 110304 x 1000 to turn it into meters then turn 4 hours into seconds making it 14400 seconds. Then divide 11030400 by 14400

They confessed their guilt.​

Answers

Answer:

heyyy

May I Know the full question

That’s not a question???? What’s the question

a pulley is used to lift a 2000 N safe over frosty's head. the safe is lifted 6m in 4s by Rudolph. how much power did Rudolph use?

Answers

Answer:

3000W

Explanation:

Given parameter:

Weight of safe  = 2000N

Height of lift = 6m

Time = 4s

Unknown:

Power used by Rudolph = ?

Solution:

Power is the rate at which work is being done. It is expressed as:

 Power  = [tex]\frac{Work done }{Time taken}[/tex]  

   Work done  = Weight x height = 2000 x 6  = 12000J

Power  = [tex]\frac{12000}{4}[/tex]   = 3000W

Which of the following can sometimes be zero for a moving body i average velocity ii distance travelled iii average speed iv displacement

Answers

Answer:

displacement can be zero...because it only care about initial and final positions

A ray of light travelling in air enters obliquely into water. Does the light ray bends towards the normal or away from the normal? Why?

Answers

Explanation:

The refraction index of water (1.33) is higher than air (1), therefore the light ray will bend towards the normal.

A 1 kg box is sitting on a flat horizontal surface that has a coefficient of static friction value of 0.8. What answer best states the minimum force required to move the box in the horizontal direction?

A. >-9.8N


B. >9.8N


C. >7.84N


D. >9N

Answers

The normal force felt by the box has magnitude

F[normal] = (1 kg) g = 9.8 N

so that the maximum magnitude of static friction is

F[s. friction] = 0.8 F[normal] = 7.84 N

In order to get the box to move, (C) a minimum force of 7.84 N is required.

If a car traveled 60 m in 30 s, what is the velocity?*

Answers

Answer:

6.56168

Explanation:

Please helpp !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answers

B. a car on a track, a stop watch, and a ruler

A car moving round a circular racing track takes 120s to do a lap of 8km what is the speed in km/hr.

Answers

Answer:

Solution in photo

Explanation:

A car moves around in a circular racing track, and it takes 120 seconds to do a lap of 8 km, so the speed in km/hr is 239.76 km/hr.

What is Speed?

The speed of an object, commonly known as v in mechanics, is a scalar quantity that corresponds towards the size of the change in that object's position over duration or the size of the change in that object's position per unit of time.

The instantaneous velocity is the absolute maximum of the average speed as the time interval's duration gets closer to zero. The cruising pace of an object in a time interval is calculated by dividing its distance traveled by the time interval's duration. Velocity and speed are different concepts.

The given data according to the question is,

Time, t = 120 s

Distance, d = 8 km

s = 8/120

s =0.0666 km/sec or

s = 0.0666/1s × 3600

s = 239.76 km/hr.

Therefore, the speed is 239.76 km/hr.

To know more about Speed:

https://brainly.com/question/312131

#SPJ2

What is the average speed of this car over the entire journey ?

Answers

Answer: 0.83333333333 km/h

Explanation: give brainliest

Which of the following statements about Copernicus' heliocentric model of the Solar System are accurate?
It was the first such model was supported by scientific evidence.
It was not published until Copernicus was close to death.
It was the first time a heliocentric model had ever been suggested.
It was not controversial, and was readily accepted.
It stated that the Sun revolved around the Earth.
It stated that the Earth revolved around the Sun.

Answers

Answer:

(i) It was the first such model was supported by scientific evidence: FALSE

(ii) It was not published until Copernicus was close to death: TRUE

(iii) It was the first time a heliocentric model had ever been suggested: FALSE

(iv) It was not controversial, and was readily accepted: FALSE

(v) It stated that the Sun revolved around the Earth: FALSE

(vi) It stated that the Earth revolved around the Sun: TRUE

Explanation:

We proceed to demonstrate the validity of each option from statement:

(i) It was the first such model was supported by scientific evidence: FALSE

The geocentric model was based mostly on interpretation of two astronomical findings: (a) The displacement of the stars with respect to Earth due to stellar parallax, (b) The apparent consistency of brightness of the planet Venus seen from Earth.

(ii) It was not published until Copernicus was close to death: TRUE

Copernicus published his heliocentric theory, contained in the book De revolutionibus orbium coelestium, months before his death, in 1543.

(iii) It was the first time a heliocentric model had ever been suggested: FALSE

Greek mathematician and astronomer Aristarchus of Samos was the first person who proposed the heliocentric model in the 4th Century.

(iv) It was not controversial, and was readily accepted: FALSE

The Roman Catholic Church defended geocentric model proposed by Claudius Ptolemy and Tycho Brahe and rejected the model proposed by Copernicus, whose publication was included in the Index Librorum Prohibitorum in 1616.

(v) It stated that the Sun revolved around the Earth: FALSE

This is the main idea of the geocentric model.

(vi) It stated that the Earth revolved around the Sun: TRUE

This is the main idea of the heliocentric model.

what are parallel circuits?​

Answers

Answer:

have two or more paths

Explanation:

A parallel circuit is one that has two or more paths for the electricity to flow, the loads are parallel to each other.

PHYSICS PLEASE HELP
a. Draw a force diagram

b. The skier has a mass of 76.6 kg and the coefficient of kinetic friction between the skier and the snow is 0.15. The angle the hill makes to the horizontal is 38 degrees and the distance the skier glides down the hill is 40.5 m. Answer the following questions based on this information.

What is the magnitude of the normal force on the skier as they glide down the hill? Show your work.

c. What is the magnitude of the force of friction on the skier as they glide down the hill? Show your work.

d. What is the acceleration of the skier as they glide down the hill? Show your work.

e. What is the speed of the skier when they reach the end of the straight section of the hill? Show your work.

f. How many seconds does the skier take to reach the end of the straight section of the hill? Show your work.

Answers

Answer:

Explanation:

b )

Normal force R = mgcosθ

= 76.6 x 9.8 x cos 38

R = 591.5 N

c )

Force of friction

= μ R

μ is coefficient of friction .

= .15 x 591.5

= 88.73 N

d )

Net force

= mg sinθ - friction

= 76.6 x 9.8 x sin 38 - 88.73

= 462.16 - 88.73

= 373.43 N

Acceleration = 373.43 / 76.6

a = 4.87 m / s²

e )

v² = u² + 2 a s

s = 40.5 m

a = 4.87

u = 0

v² = 0 +2 x 4.87 x 40.5

= 394.5

v = 19.86 m /s

f )

v = u + a t

19.86 = 0 + 4.87 t

t = 4 .07 s

AGREE OR DISAGREE: All light can be seen.

Answers

Answer:

Disagree

Explanation:

We cannot see infared lights.

Other Questions
Please Help :(Evaluate the expression when x = 9:5|6x|A)30B)10C)15D)75 EImira las maletas y papeles.a.padreb. inspectorC. embajadaPlease select the best answer from the choices providedOABC solve question 20 (a) and (b) A ball is launched into the sky at 54.4 feet per second from a 268.8 meter tall building. The equation for the balls height, h, at time t seconds is h = -3.2t^2 + 54.4t + 268.8. When will the ball strike the ground? 0.47 100with process CARDSIn a science experiment, Marisa concludes that no chemical reaction has occurred. What evidence would supportthis conclusion?A. the mass and total number of atoms were conserved B. no energy were released C. a new element was created D. no new substance was formed HOW AND WHY DID THE ANASAZI BUILD CLIFF DWELLINGS? States are in charge of giving marriage licenses. What principle of gov is highlighted with this state power? A- popular sovereignty b- federalism c- republicanism d-separation of powers Which of the following are examples of chemical energy being released or stored?I. A car battery reacting and releasing energyII. A girl eating a sandwich which helps her moveIII. Propane burning on a barbecue 12/ A kitten is _______ than a puppy.A- cuterB- more cuterC- most cuterD- cute13/ This is the ______ book in the store.A- worseB- most badC- baddestD- worst14/ A cat is _________ than a lion.A- weakerB- weakestC- more weakD- more weaker15/ That was the __________ exam I had all semester.A- more difficultB- difficultestC- most difficultD- most difficultest16/ Some sports are ________ than others.A- more exciteB- most excitingC- more excitingD- excitinger17/ Water is _______ than Soda.A- healthierB- more healthierC- most healthyD- healthiest What are the coordinates of point K? Write down two social practices you like. Please answer quickly explain the process of digestion abd absorption of carbohydrates. is 1 +4(3x -10) -12 equivalent to -9? Why did Hamilton argue for a strong federal government What type of reaction is this:C + 02 --> CO2 Which line of poetry contains examples of assonance?0 1.O 2.O3.4.Odd how a lock of blond hair on a doll can notch the clock of memory.We would ever seek in vain for the voice of the river.Fireworks pop, sizzle, and swish above the buzz of the numberless crowd.Petals fall, fall, fall, down, down, down and fade, fade, fade into nothing. Suppose you have 4 purple marbles, 3 green marbles, and 5 red marbles.If 4 marbles are selected at random, what is the probability you will get exactly 1 purple?*Note, write your answer as the most reduced fraction possible.For example 1/3 NOT 6/18. Are the ratios 5:4 and 17:12 equivalent? PART B: Which detail from the text best supports the answer to Part A?AThere are so many for us to choose from in libraries, in bookshops, and on our screens and each story seems new and exciting. ( Paragraph 1)BPopular stories like The Hobbit and The Hunger Games follow this structure. ( Paragraph 4)CCampbells Heros Journey structure shows up all over literature, no matter the genre. ( Paragraph 17)DSo the next time you read a book, or watch a movie, check to see if it follows the formula and ask yourself: is this story really new? ( Paragraph 21)