15. The above figure shows the path of a ray of light falling on the mirror(s) represented by a box. Which of the following arrangements of mirrors will produce light rays in the path shown above?

Answer:

33.18m

Explanation:

the length is 3.3 x 10^1m

Answer:

3.3x10^1m

Explanation:

F=LIBsinθ

Force F= 2.1N

Length L = unknown

Current I= 7.2A

Magnetic field B = 8.9x10^-3

sinθ = sin90° = 1 (because the field is at right angles to the wire)

2.1 = L (7.2)(8.9x10^-3)(1)

L = 32.77m

= 3.3x10^1m

Answer:

b. Gasloine evaporating into the air

I tryed to answer

Answer:

Explanation:

I-V graph always represent a straight line

Answer: F = 1391 N

Explanation:

The information given to you are:

Mass M = 1300 kg

Acceleration a = 1.07 m/s^2

The magnitude of the force striking the building will be

F = ma

Where

F = force

Substitute mass M and acceleration a into the formula

F = 1300 × 1.07

F = 1391 N

Therefore, the wrecking ball strikes the building with a force of 1391 N

Answer:

A, B and C

Explanation:

You are given the chemical equation.

The chemical reaction:

Zn (s) + HCl (9) → ZnCl2 (s) + H2

The elements involved are

Zinc, hydrogen and Chlorine.

That is, H, Cl and Zn

The Zinc is in solid form

While hydrochloric acid is in aqueous form.

The correct answers are A ,B and C

Answer:

use Newton's second law of motion

Explanation:

s= ut + ½at²

where u is initial velocity

s is distance covered

a is accerelation

t is time

s = 0×0.5 + ½×1.5+0.5²

=0.1875m

that's it .give me a brainliest if you don't mind

Answer:

0.1875 or 0.19 if you round

Explanation:

Δd = 1/2aΔt^2 +v1Δt

Δd = 1/2aΔt^2 + (0)Δt

Δd = 1/2(1.5)(0.5^2)

Δd = 0.1875m

Answer:

Deceleration is the opposite of acceleration.

The mathematical formula for deceleration is:

[tex]Deceleration = \frac{Final velocity - Initial velocity}{Time taken}[/tex]

Uniform deceleration of an object can be defined as  decreasing the velocity of an object in equal amount in an equal interval of time.

The graph attached below shows a constant decrease in the velocity with a uniform time interval.

Answer:

i think its no c.

a textbook written by a scientist. because its a first hand data.

An article written by a scientist is an example of a primary source. The correct option is option (B).

A primary source refers to an original, firsthand account or direct evidence of an event, topic, or research. It is created by individuals who directly participated in or witnessed the subject matter. An article written by a scientist would be considered a primary source as it typically presents the researcher's own observations, experiments, methodology, and conclusions.

It provides direct access to the original research and findings, making it an important source for scholarly and scientific purposes. In contrast, options A, C, and D are secondary sources that provide interpretations or summaries of information from primary sources.

Therefore, The correct option is an option (B).

To know more about the primary source:

https://brainly.com/question/24172115

#SPJ5

Answer: 15.8

Explanation:

You are given that the

Object distance U = 32 cm

Focal length F = 30.1 cm

First calculate the image distance V by using the formula

1/F = 1/U + 1/V

Substitute F and V into the formula

1/30.1 = 1/32 + 1/V

1/V = 1/30.1 - 1/32

1/V = 0.00197259

Reciprocate both sides

V = 506.94 cm

Magnification M is the ratio of image distance to object distance.

M = V/U

substitute the values of V and U into the formula

M = 506.94/32

M = 15.8

Therefore, the magnification of the image is 15.8 or approximately 16.

Answer:

-15.8

Explanation:

the other 1 didnt take into account the negative.

Answer: B. Pascal's principle

This is the idea where you compress a liquid on one end of a tube (more or less), and the liquid's pressure is transmitted to the other end to help lift a heavy object. Often the compressing force is downward to take advantage of gravity.

Answer:

It is shaped like a pinwheel

Explanation:

That's the shape.

The shape is like a pinwheel, which best describes a characteristic of a spiral galaxy. So option 1 is correct.

The twisted clusters of stars and gas known as spiral galaxies, which are frequently formed of hot, young stars, have striking shapes. As opposed to the other two major groups of galaxy forms, elliptical and irregular, spiral galaxies make up the majority of the galaxies that astronomers have so far discovered.

A spiral galaxy is one that contains Earth and our solar system, such as the Milky Way.

Approximately 72% of the galaxies that have been spotted by scientists are spiral galaxies, according to a 2010 Hubble Space Telescope survey.

The arms that circle the galaxy are formed when the disc of stars orbiting the bulge divides. These spiral arms are rich in gas, dust, and newborn stars that shine brilliantly before dying suddenly.

Hence, the first option is correct that a spiral galaxy is shaped like a pinwheel.

To learn more about Spiral Galaxy :

https://brainly.com/question/13074009

#SPJ2

Answer:

Uniform acceleration means that the object is accelerating at a constant rate. Since there is still acceleration, velocity is not constant. In fact, the velocity is increasing. This means that the object is moving faster and faster at a constant rate.

This graph is a displacement-time graph so its gradient would represent the velocity of the object. The velocity increases hence the gradient should increase (which means that the graph must be steeper and steeper with increasing time).

Constant gradient of a displacement-time graph would mean that there is no acceleration since gradient of the graph does not change so velocity is constant.

Note that it is the rate of change of velocity that is constant during uniform acceleration, not velocity.

Answer:

39 m/s

Explanation:

speed = frequency x wavelength (All SI Unit)

speed = 100 Hz x 0.30 m = 30 m/s

Answer:

D. The exact order of steps used in every experiment

Explanation:

since the scientific meathod is a process of exact steps used to create an experiment this would be the closest answer

Answer:

C. The basic categories for five processes that scientists use

Answer:

A. 1.3 per season

B. 0.77 per season

Explanation:

In the organisation's website, the National Oceanic and Atmospheric Administration, NOAA, in 2004 stated that, since 1995, there has been an increase (above average) in the Atlantic ocean's tropical clone activity corresponding to the multi-decadal oscillation's active phase

That since 1995 there has been 13 tropical storm  and 7.7 hurricanes

Therefore;

Since the number of years between 1995 and 2004 = 10 Years, we have;

A, The average number of tropical storm per, season = 13/10 = 1.3 per season

B. The average number of hurricane, per season = 7.7/10 = 0.77 per season.

Explanation:

The second one is the correct answer

Answer:

A ' is the only choice that has a true advantage and a true disadvantage.

Explanation:

Answer: gamma rays

Explanation:

Answer:

D: X: Thermal energy is converted to light energy

Y: A cold spoon placed in hot liquid gets warmer

Explanation:

j took the quiz

The first and second laws of thermodynamics are used to describe the process of heat transfer.

The laws of thermodynamics are laws that show the transfer of heat energy there are three laws of thermodynamics that guide heat transfer.

From the statements of the first and second laws of thermodynamics, the statements that fit into the circles are;

X: Thermal energy is converted to light energy

Y: A cold spoon placed in hot liquid gets warmer

Learn more about the laws of thermodynamics:https://brainly.com/question/3808473

#SPJ6

Answer:

a) Mechanical advantage is 0.2

b) maximum obtainable mechanical advantage is 1

Explanation:

The opening of the door is only possible when a force is used to push the door, by generating a torque on the door around the hinge.

Since the door is 75 cm wide, torque generated will be the product of the force applied and the width of the door.

torque = F x 75 = 75F

If the door was pushed at point on the door 15 cm from the hinges, the torque that will be generated will be

torque = F x 15 = 15F

a)The mechanical advantage MA is therefore

MA = 15/75 = 0.2

b) The best mechanical advantage that can be obtained from when you simply push it open is 1

From the case above, if we assume we push it at its maximum width from the hinge, then

MA = 75/75 = 1

Answer:

Explanation:

Current density J = i / A where i is current and A is cross sectional area

J = 5 / π x ( .1 x 10⁻² )²

= 1.6 x 10⁶ A / m²

b )

electric field applied E = V / l where V is potential difference and l is lemgth of rod

E = 75 / 1.5

= 50 v / m

c )

J = σ E

J is current density , σ is conductivity and E is electric field .

1.6 x 10⁶ = σ  x 50

σ = 3.2 x 10⁴ Ω⁻¹ m⁻¹

Resistivity = 1 / σ

= 1 / 3.2 x 10⁴

= .3125 x 10⁻⁴

=3.125 x 10⁻⁵  Ω m

Answer:

A). The first law describes how thermal energy is conserved but not the direction it moves.

Explanation:

Thermodynamics is demonstrated as the branch of physics that deals with the associations or relationships between heat and other energy forms like mechanical, chemical, and electrical).

As per the question, the first law discusses that heat is a kind or form of energy and thus, processes associated with thermodynamics are subject to energy conservation principle. Therefore, heat energy can neither be destroyed nor created but rather transferred to one place to another and converted to and from other energy forms.

Thus, the first law of thermodynamics is distinct from the second law as 'the former describes how thermal energy can be conserved to and from other forms of energy and not the direction in which it moves' while the second law focuses on entropy. Therefore, option A is the correct answer.

The first law of thermodynamics describes the conservation of heat energy but not the direction it moves. Option A correct.

First law of Thermodynamics:

It states that the energy cannot be produced or destroyed it just change from one form to another.

Heat is a form of energy and thus, follow the energy conservation principle. So, heat can be change into mechanical energy.

The second law describe the direction of movement of heat.

Therefore, option A is the correct answer.

To know more about First law of Thermodynamics:

https://brainly.com/question/7107028

Answer:

1. Current 1 (I1) is 2 A.

2. Current 2 (I2) is 4 A.

3. Current 3 (I3) is 1.3 A.

4. Power 1 (P1) is 48 W.

5. Power 2 (P2) is 96W.

6. Power 3 (P3) is 31.2 W.

7. Total current is 7.3 A.

8. Total power is 175.2 W.

Explanation:

Data obtained from the question include the following:

Voltage (V) = 24 V

Resistance 1 (R1) = 12 Ω

Resistance 2 (R2) = 6 Ω

Resistance 3 (R3) = 18 Ω

1. Determination of the current 1 (I1)

Voltage (V) = 24 V

Resistance 1 (R1) = 12 Ω

Current 1 (I1) =..?

V = I1R1

24 = I1 x 12

Divide both side by 12

I1 = 24/12

I1 = 2 A

Therefore, the current 1 (I1) is 2 A

2. Determination of the current 2 (I2)

Voltage (V) = 24 V

Resistance 2 (R2) = 6 Ω

Current 2 (I2) =..?

V = I2R2

24 = I2 x 6

Divide both side by 6

I2 = 24/6

I2 = 4 A

Therefore, the current 2 (I2) is 4 A

3. Determination of the current 3 (I3)

Voltage (V) = 24 V

Resistance 3 (R3) = 18 Ω

Current 3 (I3) =..?

V = I3R3

24 = I3 x 18

Divide both side by 18

I3 = 24/18

I3 = 1.33 A

Therefore, the current 3 (I3) is 1.3 A.

4. Determination of power 1 (P1)

Voltage (V) = 24 V

Current 1 (I1) = 2 A

Power 1 (P1) =..?

P1 = I1V

P1 = 2 x 24

P1 = 48 W

Therefore, power 1 (P1) is 48 W.

5. Determination of power 2 (P2)

Voltage (V) = 24 V

Current 2 (I2) = 4 A

Power 2 (P2) =..?

P2 = I2V

P2 = 4 x 24

P2 = 96 W

Therefore, power 2 (P2) is 96W.

6. Determination of power 3 (P3)

Voltage (V) = 24 V

Current 3 (I3) = 1.3 A

Power 3 (P3) =..?

P3 = I3V

P3 = 1.3 x 24

P1 = 31.2 W

Therefore, power 3 (P3) is 31.2 W.

7. Determination of the total current

Current 1 (I1) = 2 A.

Current 2 (I2) = 4 A.

Current 3 (I3) = 1.3 A

Total current =.?

Total current = I1 + I2 + I3

Total current = 2 + 4 + 1.3

Total current = 7.3 A

Therefore, the total current is 7.3 A.

8. Determination of the total power.

Power 1 (P1) = 48 W.

Power 2 (P2) = 96W.

Power 3 (P3) = 31.2 W.

Total power =..?

Total power = P1 + P2 + P3

Total power = 48 + 96 + 31.2

Total power = 175.2 W

Therefore, the total power is 175.2 W.

Answer: Object distance is : 20cm

Explanation:

Given the following :

Magnification (m) = - 1.50

Image Distance from lens (v) = 30cm

Calculate the object distance (u) :

Recall:

Magnification = - [image distance (v) / object distance (u)]

Therefore, Inputting our values :

-1.50 = - (30 / u)

1.50 * u = 30

u = 30 / 1.50

u = 20 cm

Answer:

20 cm

Explanation:

acellus

Answer:

The average power the woman exerts is 0.5 kW

Explanation:

We note that power, P = The rate at which work is done = Work/Time

Work = Energy

The total work done is the potential energy gained which is the energy due to vertical displacement

Given that the vertical displacement = 5.0 m, we have

Total work done = Potential energy gained = Mass, m × Acceleration due to gravity, g × Vertical height, h

m = 51 kg

g = Constant = 9.81 m/s²

h = 5.0 m

Also, time, t = 5.0 s

Total work done = 51 kg × 9.81 m/s²× 5 m = 2501.55 kg·m²/s² = 2501.55 J

P = 2501.55 J/(5 s) = 500.31 J/s = 500.31 W ≈ 500 W = 0.5 kW.

Answer:

Final velocity of the object(v) = 114 m/s

Explanation:

Given:

Initial velocity (u) = 14 m/s

Accelerates (a) = 5 m/s²

Time taken = 20 seconds

Find:

Final velocity of the object(v) = ?

Computation:

According to 1st law of motion.

⇒ v = u +at

⇒ v = 14 + (5)(20)

⇒ v = 14 + 100

⇒ v = 114 m/s

Final velocity of the object(v) = 114 m/s

Answer:

Metals are excellent conductors because the atoms in a metal form a matrix through which their outer electrons can move freely.

Explanation:

Answer:

Explanation:

Metals are good conductor of electricity because they have very large number of free valance electrons whereas glass has no free electrons to conduct electricity. So metals good conductor whereas glass is a bad conductor of electricity.

Answer:

Explanation:

I would have been an anti-federalist. They favored a weak central government because they related it to the British tyranny. Federalists believed in a strong central government, almost controlling. I would not have respected this type of government.