since Ethanol has a heat capacity of 0.614 cal/g °C. If 50 g of ethanol has a temperature of 30ºC and a piece of hot Copper is added to the ethanol causing the temperature to increase to 70ºC. What is the amount of heat absorbed by the ethanol?

Answer:

c

Explanation:because its the correct one

The line width is calculated as 121.6nm

Data;

This is used to calculate the wavelength of an electron when it moves from one state to another.

For Lyman series, n = 1

The energy difference in the two state transitioning are

[tex]n_2[/tex] = ∞

The formula is given thus;

[tex]\frac{1}{\lambda}= R(1(n_1)^2 - \frac{1}{(n_1)^2}.Z^2\\[/tex]

R = Rydberg's constant

Z = atomic number

Since the excited electron dropped from the 1st state to the ground state, the finest line of Lyman series would be

[tex]\frac{1}{\lambda} = R(1(1)^2 - \frac{1}{2^2}).1^2\\z=1\\\lambda = \frac{4}{3} * 912A^o\\\lambda = 121.6nm[/tex]

The line width is calculated as 121.6nm

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Answer:

Earth rotates on its axis from west to east approximately every 24 hours

Explanation:

hope this helps :)

Answer:

R1 is the first resistance level. It usually falls above the pivot point and below R2 but there are circumstances (see below) when the pivot point can be above R1. R1 is calculated as part of the Pivot Points calculations that traders use to determine where the market might reverse direction.

Explanation:

Find distance she traveled:

100m -25m = 75m

58 seconds / 2 second intervals = 29

29 x 2.6m = 75.4 meters total.

if the distance wasn’t rounded the statement was False.

Answer: False

Answer:

1. Option B
2. Option C
3. Option D
4. Option C
5. Option C

Explanation:

Given the following questions:

Question one:
Your answer is option B, a position time graph is one of the most common graphs to use to describe the motion of objects. The vertical line of the position time graph is the line that would be the y axis in some math cases. This line represents the "position of the object" or option B.

Question Two:
Your answer is option C or a "distance-time graph." The vertical axis shows the distance travels, while the horizontal line shows the time the object spends in the air. Distance-time graphs are used to show the distance an object traveled, in a certain amount of time.

Question three:
Your answer is option D or "shortest distance between two positions." Displacements definition is purely moving something from its initial position. Displacement is also seen as length and distance, which is why the shortest distance between two positions would be considered as true when it comes to displacement.

Question four:
Horizontal line would be the x-axis on a normal coordinate plane, since this is a distance-time graph and the horizonal line represents time. The answer will be option C or "object is accelerating." Since a distance-time graph shows how far an object goes in a certain amount of time, the horizontal line shows how fast the object is moving while traveling that distance within that certain amount of time.

Question five:
Your answer is option C or "X-axis: Time; Y-axis: Displacement." Since we are talking about a displacement-time graph, Y-axis is the dependent variable, it is what's being measured, so that would be displacement. While x-axis is the independent variable, which is what is being tested, so the x-axis will be time.

Hope this helps.

Answer:

t= 137.5 s

Explanation:

So if we are wanting to figure out how long it takes runner B to catch runner A. we must first set the slope of each runner equal to one another

Slopes:

Runner A:    y = 7.50x + 55

Runner B:    y = 7.90 x

sooooo

  7.50 x + 55 = 7.90 x

- 7.50 x          - 7.50 x

 55 = .40 x

55/.40 = .40 x / .40

x = 137.5 s

t= 137.5 s

7.50 * 137.5 + 55 =1086.25 m

7.90 * 137.5 =  1086.25 m

Runner B will catch Runner A after approximately 44.00 seconds.

To determine the time it takes for Runner B to catch Runner A, we need to consider their relative speeds and the initial distance between them.

Runner B is running faster than Runner A, so the distance between them will decrease over time. The relative speed of Runner B with respect to Runner A is the difference in their speeds:

Relative speed = Speed of Runner B - Speed of Runner A

Relative speed = 7.90 m/s - 7.50 m/s = 0.40 m/s.

Runner B needs to cover the initial distance (head start) of 55.0 meters between them. The time it takes for Runner B to catch up to Runner A can be calculated using the formula:

Time = Distance / Relative Speed.

Time = 55.0 m / 0.40 m/s = 137.5 seconds.

However, this time includes the time taken by Runner A to run the initial distance. To find the time taken by Runner B to catch Runner A after accounting for the head start, we subtract the initial time from the total time:

Time taken by Runner B = Total time - Time taken by Runner A.

Runner A's initial time = Distance / Speed = 55.0 m / 7.50 m/s = 7.3333 seconds.

Time taken by Runner B = 137.5 seconds - 7.3333 seconds = 130.1667 seconds.

Rounded to two decimal places, it takes Runner B approximately 130.17 seconds to catch up to Runner A.

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Answer:

gravitation field strength: 5 N/kg

Explanation:

        Weight(N) = mass(kg) * gravitational field strength(N/kg)

make sure the units are proper and make change only if different units visible. Like mass given in grams and covert it into kg. *must* and sometimes weight given in kilo-newton covert it into Newtons. *must*

using the formula:

5 * gravitational field strength = 25

gravitational field strength = 25/5

gravitational field strength = 5 N/kg

Answer:

The five steps for determining density can be found in simple form as follows, measure the mass of the container, measure the volume of the liquid(s), measure the combined mass of the liquid and the container, and then determine the mass of the liquid alone and divide the mass by the volume of it.

Answer:

E is the answer of the question in my opinion

Answer:

B. Less force is needed to stop a person that has less mass.

Explanation:

Change aspect of personality can occur by working hard and being focused on the changes you want to make.

A personality change can occur when an individual learns new habit. This new habit is developed or learnt through habitual responses that have stuck.

Thus, we can conclude that changing your habitual responses over time is one way to create personality change.

The only correct option is,  working hard and being focused on the changes you want to make.

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Answer:

force=12000

Explanation:

F=m*a aka force equals mass times acceleration so 800*15=12000

Answer:

12000 N

Explanation:

The equation for Force is:

[tex]Force=mass*acceleration[/tex]

We can plug in the given values into the equation:

[tex]Force=800kg*15m/s^2\\Force=12000N[/tex]

Answer:

transverse waves, longitudinal waves, and surface waves.

The equivalent resistance of the circuit is 8.6 Ω.

Resistance can be defined as the opposition to current flow in an electric circuit. The S.I unit of resistance is ohms.

To calculate the equivalent resistance, we use the formula below.

Formula:

Where:

From the diagram,

Given:

Substitute these values into equation 1

Hence, The equivalent resistance of the circuit is 8.6 Ω
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Answer:

Approximately [tex]\text{N$37^{\circ}$W}[/tex] (approximately [tex]37^{\circ}[/tex] west of north.)

Explanation:

The velocity of the swimmer relative to the water is given to be [tex]v(\text{swimmer})= 5.0\; {\rm m\cdot s^{-1}}[/tex]. Decompose this velocity into two components:

Decompose the velocity of the current [tex]v(\text{current}) = 3.0\; {\rm m\cdot s^{-1}}[/tex] along the same set of directions.

The velocity of the swimmer relative to the bank would be the vector sum [tex](v(\text{swimmer}) + v(\text{current}))[/tex]. Decompose this vector sum in the same directions:

Swimming straight across requires that the swimmer travel towards the banks but not along the banks. In other words, the velocity of the swimmer relative to the bank should be [tex]0[/tex] in the direction of the river: [tex]v_{\parallel}(\text{swimmer}) + v_{\parallel}(\text{current}) = 0[/tex].

Rearrange to obtain:

[tex]v_{\parallel}(\text{swimmer}) = -v_{\parallel}(\text{current})[/tex].

Thus, [tex]v_{\parallel}(\text{swimmer})[/tex] should be the exact opposite of [tex]v_{\parallel}(\text{current})[/tex].

Since [tex]v_{\parallel}(\text{current}) = 3.0\; {\rm m\cdot s^{-1}}[/tex] to the east, [tex]v_{\parallel}(\text{swimmer})\![/tex] should be [tex]3.0\; {\rm m\cdot s^{-1}\![/tex] to the west.

Refer to the diagram attached: [tex]v(\text{swimmer})[/tex] and its two components [tex]v_{\parallel}(\text{swimmer})[/tex] and [tex]v_{\perp}(\text{swimmer})[/tex] are the three sides of a right triangle, with[tex]v(\text{swimmer})= 5.0\; {\rm m\cdot s^{-1}}[/tex] as the hypotenuse.

Since the swimmer is travelling to the north, [tex]v_{\perp}(\text{swimmer})[/tex] would point northward.

The side [tex]v_{\parallel}(\text{swimmer})[/tex] would be opposite to the angle between the hypotenuse [tex]v(\text{swimmer})= 5.0\; {\rm m\cdot s^{-1}}[/tex] and north ([tex]v_{\perp}(\text{swimmer})[/tex],) Thus, the value of that angle would be:

[tex]\begin{aligned}& \arcsin\left(\frac{\text{opposite}}{\text{hypotenuse}}\right) \\ \\ =\; & \arcsin\left(\frac{3\; {\rm m\cdot s^{-1}}}{5\; {\rm m\cdot s^{-1}}}\right) \\ \approx \; & 37^{\circ}\end{aligned}[/tex].

Since [tex]v_{\parallel}(\text{swimmer})[/tex] points to the west, the direction of [tex]v(\text{swimmer})[/tex] would be approximately [tex]37^{\circ}[/tex] west of north, [tex]\text{N$37^{\circ}$W}[/tex].

Answer:

Explanation:

Please follow the directions here and draw out the answer yourself.

Draw two arrows of the same length. Both start on the dot but one points up and the other points down.

Label the up arrow as "Air resistance" and the down arrow as "Weight, Me*g". Make sure the two arrows have the same length and are directly opposite each other.

The free-response to the question based on the given diagram is:

This refers to the apparatus or equipment that is used to help a person to descend slowly from a high altitude.

Hence, given that a block of mass is attached to a parachute and while descending, it encounters air resistance, then to show the relative length of all vectors:

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Answer:

Electrons repel one another - they will move "away" from the left side of the leftmost can- (the right can must become more negatively charged than the left can) -

B appears to be the best answer

The electrons move from the left soda can to the right soda can. The answer is (B).

When the negatively charged balloon is moved close to the left soda can, it will repel the negatively charged electrons in the soda can. This will cause the electrons to move away from the balloon and distribute themselves within the soda can.

Since the soda cans are in contact with each other, the excess electrons from the left soda can will be repelled by the negative charge on the balloon and will flow to the adjacent right soda can. The electrons will continue to move until there is no potential difference between the two cans, which means that they will stop flowing when both cans have the same amount of negative charge.

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It's very wonderful to help you today!

Answer:

The resistance of the wire after being heated is approximately 1.15 times the resistance before being heated.

Explanation:

The resistance of the wire goes up as the temperature goes up.

By Ohm's law, we have the relationship between the resistance of a conductor R, the current flowing through it, I, and the voltage across it, V,

[tex]V=R~x~I[/tex]

As described, the current through the wire decreases so, to maintain the same voltage, the resistance must increase when the wire is heated. Let's say R1 is the resistance before heating the wire and R2 is the resistance after,

[tex]V=R_{1} x~I_{1} =R_{2}~} x~I_{2}[/tex]

Let's solve for R2,

[tex]R_{2} =\frac{I_{1} }{I_{2} }~x~R_{1}[/tex]

In this case, I1 = 0.3A and I2 = 0.26A,

[tex]R_{2} =\frac{0.3A}{0.26A} ~x~R_{1} =1.15R_{1}[/tex]

Hence, the resistance of the wire after being heated is approximately 1.15 times the resistance before being heated.

The velocity of the bullet and the block just after impact is mathematically given as

u=6.647m/s

v=1.534m/s

Question Parameters:

In the ballistic pendulum experiment, a bullet of mass 0.06 kg is fired

horizontally into a wooden block of mass 0.2 kg.

the block is 0.12 m above its initial position.

Generally the equation for the conservation of energy  is mathematically given as

0.5(m+n)v^2=(m+n)gh

Therefore

v^2=2gh

[tex]v=\sqrt{2*9.8*0.12}[/tex]

v=1.534m/s

Hence

mu+m*0=(m+n)v

0.060*u=(0.060+0.2)*1.534

u=6.647m/s

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Answer:

When there is a point source used without directing the light or sound in a direction, the area of a sphere = 4πr 2 is used instead of the area of circle for calculating intensity. The minimum intensity of sound that a human can hear is 10 -12 Wm -2 and the maximum is 1 Wm -2.

Explanation:

Answer:

Equivalent resistance: 13.589 Ω

Explanation:

R series = R1 + R2 + R3 ...

[tex]\frac{1}{R_{eq} } = \frac{1}{R1} +\frac{1}{R2} +\frac{1}{R3} ...[/tex]

Find the equivalent resistance of the right branch of the circuit:

[tex]R_{eq} = R_{2} +R_{3} \\R_{eq} = 20.7 + 25.8 = 46.5 ohms[/tex]

[tex]\frac{1}{R_{eq} } = \frac{1}{19.2} +\frac{1}{46.5}\\\\\frac{1}{R_{eq} } = 0.0735887097\\\\R_{eq} = 13.5890411[/tex]

if the bookstore sold 8 books for $66 at that rate how much was one book

Answer:

The Catholics.

Explanation:

see answer.

Answer:

B 1,3, and 4

Explanation:

[tex] \huge\green{\overline{\underline{\rm{\purple{꧁⫷ᴀɴsᴡᴇʀ⫸꧂ }}}}} [/tex]

[tex] \large\green{\overline{\underline{\rm{\red{•••••••••••••••••••••••••}}}}} [/tex]

what is the name of the scientist that discovered gravity?

[tex] \large\green{\overline{\underline{\rm{\blue{•••••••••••••••••••••••••}}}}} [/tex]

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The scientist named Isaac Newton discovered the gravity. But before that Aristotle was discovered the gravity first but the calculations were poor and not enough for knowing what it is.

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The magnetic field at the center of the circular loop is 3.24 x 10⁻⁴ T.

The current in the wire is calculated as follows;

V = IR

I = V/R

I = 16.7/0.251

I = 66.53 A

The magnetic field at the center of the circular loop is calculated as follows;

[tex]B = \frac{\mu_0 I}{2R} \\\\B = \frac{4\pi \times 10^{-7} \times66.53 }{2\times 0.129} \\\\B = 3.24 \times 10^{-4} \ T[/tex]

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Answer:

B.105

Explanation:

Non-zero digits are always significant.

Zeros between significant digits are also significant.

Trailing zeros are significant only after a decimal point.

0.015 has 2 significant figures.

105 has 3 significant figures.

150 has 2 significant figures.

1.050 has 4 significant figures.

The rotational speed of the person is 0.4 rad/s.

The rotational speed of the person in radian per second is calculated as follows;

v = ωr

where;

ω = v/r

ω = 2/5

ω = 0.4 rad/s

Thus, the rotational speed of the person is 0.4 rad/s.

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Answer:

A

Explanation:

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