give an expression for the mechanical advantage of an inclined plane​

Explanation:

We know that :

[tex]P = \frac{V^{2} }{R} [/tex]

Resistance of Bulb :

[tex]R = \frac{ V^{2} }{P } = \frac{ {(240)}^{2} }{280} = 205.71 \: ohms[/tex]

As per Ohms laws :

Current when (V = 200)

[tex]i \: = \frac{ V}{ R} = \frac{200}{205.71} = 0.97 \: A[/tex]

Answer:

use this formula

Average Speed = (Total distance)/(Total Time) =

Answer:

(a) She has traveled a total distance of 28958.04 m during the entire trip.

(b) Her average velocity for the trip is 6.12 m/s

Explanation:

Here is the complete question:

A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 26.8 minutes at an average speed of 7.57 m/s. During the second part, she rides for 42.4 minutes at an average speed of 3.17 m/s. Finally, during the third part, she rides for 9.69 minutes at an average speed of 15.0 m/s. (a) How far has the bicyclist traveled during the entire trip?  (b) What is her average velocity for the trip?

Explanation:

(a) To determine how far the bicyclist has traveled during the entire trip, we will calculate the distance she covered in each part of the trip, and then sum up the distances to determine the total distance covered.

During the first part, she rides for 26.8 minutes at an average speed of 7.57 m/s

That is,

Average speed, [tex]v[/tex] = 7.57 m/s

and time, [tex]t[/tex] = 26.8 minutes

Convert the time to seconds

∴ [tex]t[/tex] = 26.8 minutes = (26.8 × 60) secs = 1608 secs

[tex]Average speed = \frac{Distance }{ Time}[/tex]

Then, [tex]Distance = Average speed[/tex] × [tex]Time[/tex]

Hence, for the first part

[tex]Distance = 7.57[/tex] × [tex]1608[/tex]

[tex]Distance = 12172.56[/tex] m

This is the distance covered in the first part of the trip.

During the second part, she rides for 42.4 minutes at an average speed of 3.17 m/s

That is, Average speed, [tex]v[/tex] = 3.17 m/s

and time, [tex]t[/tex] = 42.4 minutes

Convert the time to seconds

∴ [tex]t[/tex] = 42.4 minutes = (42.4 × 60) secs = 2544 secs

From,

[tex]Distance = Average speed[/tex] × [tex]Time[/tex]

[tex]Distance = 3.17[/tex] × [tex]2544[/tex]

[tex]Distance = 8064.48[/tex] m

This is the distance covered in the second part of the trip.

During the third part, she rides for 9.69 minutes at an average speed of 15.0 m/s

That is, Average speed, [tex]v[/tex] = 15.0 m/s

and time, [tex]t[/tex] = 9.69 minutes

Convert the time to seconds

∴ [tex]t[/tex] = 9.69 minutes = (9.69 × 60) secs = 581.4 secs

From,

[tex]Distance = Average speed[/tex] × [tex]Time[/tex]

[tex]Distance = 15.0[/tex] × [tex]581.4[/tex]

[tex]Distance = 8721[/tex] m

This is the distance covered in the third part of the trip.

Now for the distance covered during the entire trip,

Total distance = distance covered in the first part of the trip + distance covered in the second part of the trip + distance covered in the third part of the trip

Hence,

Total distance = 12172 m + 8064.48 m + 8721 m

Total distance = 28958.04 m

Hence, she has traveled a total distance of 28958.04 m during the entire trip.

(b) For her average velocity for the trip

Average velocity is given by

[tex]Average velocity = \frac{Total distance traveled}{Total time}[/tex]

Total distance traveled = 28958.04 m

Total time = 1608 secs + 2544 secs + 581.4 secs

Total time = 4733.4 secs

Hence,

[tex]Average velocity = \frac{28958.04}{4733.4}[/tex]

Average velocity = 6.1178 m/s

Average velocity ≅ 6.12 m/s

Answer:

i believe its c

Explanation:

I took the test

The one  best illustrates a study done in psychology is a study that shows how Katrina’s stress levels contribute to her obsessive exercise habits. The correct option is C.

Psychology is the scientific study of human mind and his behavior on various situations. It includes the study of conscious and unconscious phenomena, feelings and emotions attached to some person or a habit.

The psychology deals with the stress levels which make up the wrong habits. This may be caused due to overthinking, one starts to push himself more and more. He wants to stress out to manage this stress and does the exercise obsessively.

So, the study how Katrina’s stress levels contribute to her obsessive exercise habits is an example of psychology study.

Thus, the correct option is C.

Learn more about psychology.

https://brainly.com/question/10980588

#SPJ2

Answer: Autotrophs

Explanation: Autotrophs make their own food from nature. They do not depend on other creatures for food

The answer to the question is 1.5708~1.571.

Answer:

The correct option is the second option with horizontal bars at a =  6, a = -1, and a = 4 m/s²

Please find attached the table of values and a graph representing the correct option

Explanation:

The given data can be presented as follows;

Time (s),                 Velocity (m/s),               Acceleration (m/s²)

0,                                    -1,                                        6

0.5,                                   2,                                       6

1,                                       5,                                        6

0,                                      5,                                       -1

0.5,                                  4.5,                                     -1    

1,                                       4,                                       -1

1.5,                                    3.5,                                     -1

2,                                     3,                                        -1

2.5,                                 2.5,                                      -1

3,                                     2,                                         -1

0,                                     2,                                          4

0.5,                                   4,                                         4

1,                                        6,                                        4

1.5,                                    8,                                         4  

2,                                     10,                                         4

From the data, and the graph the acceleration for the period from the time t = 0 to t = 1 is 6 m/s²

From t = 1 to t = 4, the acceleration is constant and equal to -1

From t = 4 to t = 6 the acceleration is also constant and equal to 4

Answer:

false

Explanation:qualitative is a word or name that describe a quality of the individual while quantitative is a number or something that can be counted or measured from the individual.

Answer:

After 2 seconds the velocity of the object is 0 m/s.

Explanation:

The velocity at 2 seconds later can be calculated as follows:

[tex] V_{f} = V_{0} - gt [/tex]

Where:

[tex]V_{f}[/tex]: is the velocity at 2 seconds

[tex]V_{0}[/tex]: is the initial velocity = 20 m/s

g: is the gravity = 10 m/s²

t: is the time = 2 s

Hence, the final velocity is:

[tex] V_{f} = V_{0} - gt = 20 m/s - 10 m/s^{2}*2 s = 0 m/s [/tex]

This value (0 m/s) means that the object has reached the maximum height.

Therefore, after 2 seconds the velocity of the object is 0 m/s.

I hope it helps you!

Answer:

quantitive observation

quantitative observation is a data analysis that is objective. It measures research variables using numerics and statistics. It is a method of observation that views research variables in quantity, which is why the values can be counted in something like age, weight, volume, and scale.

Answer:

Explanation:

In this problem we are expected to find the weight of the plastic tank and the weight of the equal volume of water

Given that

density of water = 1000 kg/m^3

volume of plastic tank is same as the volume of water= 0.18 m^3

we need to solve for the mass of the water

we know that density is = mass/volume

1000= mass/0.18

mass= 1000*0.18

mass= 180 kg

the total mass of the combined system is

4+180= 184 kg

the weight = mg (assuming g= 9.81 m/s^2)

weight = 184*9.81

weight= 1805.04 N

Answer:

6.03 m/s

Explanation:

Average speed = total distance traveled/total time taken

7 = 450 + 100/total time

total time = 550/7 = 78.57 s

Speed of camel on the bicycle = distance/time

25 = 100/time

time = 100/25 = 4 s

Total time = 78.57 s

Time spent riding bicycle = 4 s

Time spent walking = total time - time spent riding bicycle

                                  = 78.57 - 4 = 74.57 s

Speed of walking = distance walked/time spent walking

                             = 450/74.57

                                 = 6.03 m/s

Answer:

This is because the air outside is always cooler than the air inside, so after staying outside your body adapts to the cold air, when you come back inside, the cold air is still in you which makes the room seem warmer.

Answer:

magnitude of gravitational force between the Earth and the Sun at B is greater than that at A

Explanation:

Formula of gravitational force:

F = GMm/r^2

(r is the distance between 2 objects)

We see that r(B) < r(A) since at B, the Earth is closer to the Sun than at A

According to the Formula, the smaller r is, the greater F is

So, F(B) > F(A)

Answer:

x=± 2

=±1.4142

x=0

Explanation: If this does not help then I'm sorry.

STEP

1

:

           1

Simplify   —

           2

Equation at the end of step

1

:

        1

 k -  ((— • k) • x2)  = 0  

        2

STEP

2

:

Equation at the end of step 2

      kx2

 k -  ———  = 0  

       2  

STEP

3

:

Rewriting the whole as an Equivalent Fraction

3.1   Subtracting a fraction from a whole

Rewrite the whole as a fraction using  2  as the denominator :

         k     k • 2

    k =  —  =  —————

         1       2  

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

3.2       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

k • 2 - (kx2)     2k - kx2

—————————————  =  ————————

      2              2    

STEP

4

:

Pulling out like terms

4.1     Pull out like factors :

  2k - kx2  =   -k • (x2 - 2)  

Trying to factor as a Difference of Squares:

4.2      Factoring:  x2 - 2  

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check : 2 is not a square !!

Ruling : Binomial can not be factored as the difference of two perfect squares.

Equation at the end of step

4

:

 -k • (x2 - 2)

 —————————————  = 0  

       2      

STEP

5

:

When a fraction equals zero

5.1    When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

 -k•(x2-2)

 ————————— • 2 = 0 • 2

     2    

Now, on the left hand side, the  2  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :

  -k  •  (x2-2)  = 0

Theory - Roots of a product :

5.2    A product of several terms equals zero.  

When a product of two or more terms equals zero, then at least one of the terms must be zero.  

We shall now solve each term = 0 separately  

In other words, we are going to solve as many equations as there are terms in the product  

Any solution of term = 0 solves product = 0 as well.

Solving a Single Variable Equation:

5.3      Solve  :    -k = 0  

Multiply both sides of the equation by (-1) :  k = 0

Solving a Single Variable Equation:

5.4      Solve  :    x2-2 = 0  

Add  2  to both sides of the equation :  

                     x2 = 2

When two things are equal, their square roots are equal. Taking the square root of the two sides of the equation we get:  

                     x  =  ± √ 2  

The equation has two real solutions  

These solutions are  x = ± √2 = ± 1.4142  

Three solutions were found :

x = ± √2 = ± 1.4142

k = 0

Terms and topics

Answer:

3

Explanation:

just did it

Answer:

The energy returns to the weightlifter's muscles, where it is dissipated as heat.

Explanation:

The energy returns to the weightlifter's muscles, where it is dissipated as heat. As long as the weightlifter controls the weight's descent, their muscles are acting as an overdamped shock absorber, as if the weight were sitting on a piston containing very thick fluid, slowly compressing it downward (and slightly heating up the fluid in the process). Since muscles are complicated biological systems and not simple pistons, they require metabolic energy to maintain tension throughout the controlled descent, so the weightlifter feels like they're putting energy into the weight, even though the weight's gravitational potential energy is being converted into heat within the lifter's muscles.

Answer:

The final velocity of the race car is 27.14 m/s

Explanation:

Given;

initial velocity of the race car, u = 18.5 m/s

acceleration of the race car, a = 2.47 m/s²

distance covered by the race car, s = 79.78 m

Apply the following kinematic equation to determine the final velocity of the race car.

v² = u² + 2as

v² = (18.5)² + 2(2.47)(79.78)

v² = 736.363

v = √736.363

v = 27.14 m/s

Therefore, the final velocity of the racecar is 27.14 m/s

Answer:

Sonar

Explanation:

Sonar is a technique that involves the use of sounds in viewing substances in a water medium to aid movement or communication. It makes use of the advantage of sound waves traveling faster and farther in water when compared to other types of waves such as light waves.

During World War II, the military employed the use of SONAR in imaging the seafloor by sending pulses of sound waves down through the water and measuring the time it took for the sound to bounce off the seafloor and return to the receiver.

Answer:

405000 g

Explanation:

1hg(hectogram)=100g

Therefore,

400000g+5000g=405000 g

Answer:

the density makes something float or sink below water its the "water weight "

Explanation:

Answer:

They come in different kinds, called elements, but each atom shares certain characteristics in common. All atoms have a dense central core called the atomic nucleus. ... All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is.

Answer:

y = 43.55 + 2.15t

Explanation:

We were told that in 1983, the per capita consumption was 37.1 pounds, and in 1989 it was 50 pounds.

If we assume t = 0 corresponds to year 1980. Then, for 1983 it will be t = 3 and for 1989,it will be t = 9.

Thus, expressing the information as ordered pairs, we have; (3,37. 1) and (9,50).

Let us now find slope of the linear function:

m1 = (y2 - y1)/(t2 - t1)

m1 = (50 - 37.1)/(9 - 3)

m1 = 2.15

So, we can find the linear equation as;

y - 37.1 = 2.15(t - 3)

y = 37.1 + 2.15t - 6.45

y = 43.55 + 2.15t

Answer:

0.00222km/s

Explanation:

[tex]Distance = 0.2km\\Time = 1\:minute \:30\:seconds = 90\:seconds\\\\Average \:speed =?\\\\Average \:speed = \frac{0.2}{90} \\A.V = 0.002222\\A.V =0.00222[/tex]

Answer:

Force=mass×acceleration.

4:5 for masses , 2:3 for acceleration.

For the first car it will be 4×2=8N

For the second car it will be 5×3=15N

Answer: 10m/s²

Explanation: Acceleration= (v-u)/t

                                                 So here it’s (40-20)/2

                                                 Which is equal to 10

Answer: sure the truck with 8000 kg mass

Explanation: use the rule: ke=1/2mv^2

Answer:

Technician B

Explanation:

The kinetic energy of an object is possessed when it is in motion. It is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]

m is mass, v is speed

The kinetic energy is directly proportional to its speed. It does not depend on its weight. It would mean that Technician B is correct as he says that "the kinetic energy of a moving vehicle is directly proportional to its speed".

Answer:

Growth and Development