As a train starts from rest then accelerates down the track, coming toward an observer faster and faster, the frequency of the sound waves coming toward the observer will be

Answer:

Explanation:

PE = mgh where m is the mass in kg, g is the pull of gravity which is 9.8, and h is the height of the object above the point to which it could possibly fall, measured in meters. Plugging in:

PE = 10(9.8)(20) so

PE = 1960 J

This should be rounded to 1 sig fig according to the rules of sig fig and your numbers here, but I imagine you're not following them all that much. It should be 2000 J

Answer:

250mn

Explanation:

Answer:

-9.8

Explanation:

gravity gives constant acceleration,negative for going upwards

Answer:

The ball and the wall experience the same force.

Explanation:

According to the third law of Newton, which states that "for every action, there is an equal and opposite reaction", this means that when an object 1 acts on object 2 with a certain force, object 2 also acts on object 1 with the same magnitude of force but in an opposite direction.

According to this question, a ball hits a wall with a certain force. This means that the wall will react on the ball with the same force magnitude, but in an opposite manner. Hence, the ball and the wall experience the same force.

Answer:

Explanation:

[tex]E=\frac{q}{F}[/tex] where q is the charge of the electron and F is the electrostatic force. Filling in:

[tex]E=\frac{-1.6*10^{-19}}{9.2*10^{-15}}[/tex] which gives you an electric field magnitude of

E = -1.7 × [tex]10^{-5[/tex] C/N

Answer:

Answer:

No, the metal sphere becomes positively charged because electrons are transferred from the sphere to the rod.

Answer:

... is called competition.

Explanation:

competition for same thing

✔️If the ball is cold, its particles tend to have a smallamount of kinetic energy.

✔️The particles that make up the ball are moving even when the ball is not.

✔️The temperature of the ball depends on the kinetic energies of the particles that make up the

ball.

#CarryOnLearning!

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yes it matters because if it's not sharp it would take all day

Answer:

an axe is a type of machine called a wedge. it does matter how sharp your axe is. if your axe is not sharp then you will have a harder time cutting wood.

Explanation:

Answer:

(independent variable) x-axis

(dependent variable) y-axis

Answer:

R = 25 Ohms

Explanation:

Given the following data;

Voltage (p.d) = 15 V

Current = 0.6 A

To find the resistance of the wire;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

[tex] V = IR[/tex]

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

[tex] R = \frac {V}{I} [/tex]

Substituting into the equation, we have;

[tex] R = \frac {15}{0.6} [/tex]

R = 25 Ohms

Answer:

Frequency

Explanation:

A period is the number of revolutions in a minute.

[tex] Period = \frac {time}{number \; of \; oscillations}[/tex]

Also, frequency can be defined as number of oscillation per unit time.

Mathematically, frequency is given by the formula;

[tex] Frequency = \frac {number \; of \; oscillations}{time}[/tex]

Thus, we can deduce that frequency of an oscillation is the inverse of the period (time) of oscillation.

Mathematically, period is expressed as;

[tex] Period = \frac {1}{frequency}[/tex]

This ultimately implies that, an object's period of oscillation can always be used to solve for frequency.

Answer:

A comet

Explanation:

The picture is of an elliptical orbit of a comet. You can tell it is a comet because of the tail. Also, I just took the test and it was a comet.

Answer:

hey are you ok!?!?!?!

Explanation:

Is Angie your Dad new gf or wife???

Answer:

:(

Explanation:

u ok?

running away from problems only makes things worse. Your teaching urself to run. but I dont blame u

anyway hope u find what ur looking for out there!!

Answer:

Where' the graph

Explanation:

Answer:

[tex][A] = [B] = [C] = [D][/tex] por el Principio de Homogeneidad Dimensional y el uso de operaciones de adición y sustracción.

Explanation:

Por el Principio de Homogeneidad Dimensional, A, B, C y D deben tener las mismas magnitudes físicas para la realización de operaciones de adición y sustracción. Es decir:

[tex][A] + [B] = [C] - [D][/tex], donde [tex][A] = [B] = [C] = [D][/tex]

Answer:

sry I can't help you In that

A light bulb used in homes converts electrical energy into light energy  The amount of light energy output by the lamp in 9.0 hours of use is 23.4 J.

The ability of an atom's charged particles to initiate an activity or move an object is known as electrical energy.

The proportion of the device's useful energy transferred to the device's total energy input.

The input power of the light bulb = 52 w.

In 9.0 hours of use.

Hence,

52 x 9.0 = 468 J

The following equation calculates efficiency as a percentage and is represented as follows:

Efficiency is calculated as (Usable Energy Output/Total Energy Input) x 100%.

The lightbulb's efficiency is 5.0%.

(The light energy output/ 468) x 100% = 5%

So, the light energy output = 23.4 J

Therefore, the amount of light energy output by the lamp in 9.0 hours of use is 23.4 J.

To learn more about electrical energy, refer to the link:

https://brainly.com/question/16182853

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Answer:

A

Explanation:

a statement that can be used to predict the motions of two objects only under special conditions

Answer:

A temporary orbit in which a spacecraft awaits the next phase of its mission .

Answer:

The pressure exerted by the girl is 245,000 N/m²

Explanation:

Given;

mass of the girl, m = 50 kg

area of the girl's shoe, A = 0.002 m²

The pressure exerted by the girl is calculated as follows;

[tex]P = \frac{F}{A} \\\\Where;\\F \ is \ the \ force \ exerted \ by \ girl's \ weight\\\\P = \frac{F}{A} = \frac{mg}{A} = \frac{50 \times 9.8}{0.002} = 245,000 \ N/m^2[/tex]

Therefore, the pressure exerted by the girl is 245,000 N/m²

Answer:

-0.75 m

Explanation:

The displacement of the girl is given by x = x₀cosωt where x₀ = maximum displacement of swing = 1.5 m, ω = angular frequency = π/3 rad/s and t = time of swing = 4 s

Substituting the values of the variables into the equation, we have

x = x₀cosωt

x = (1.5 m)cos(π/3 rad/s × 4 s)

x = (1.5 m)cos(2π/3)

x = (1.5 m)cos120°

x = 1.5 m × -0.5

x = -0.75 m

So, the girl is 0.75 m to the left of the equilibrium position 4 seconds into the motion.

Pressure will decrease whenever the surface area increases, and when the weight of the object is reduced.

[tex] \color{green} {\huge \circ \degree \degree} \boxed{\normalsize{ \mathrm{ \underline{ \color{red}pressure \: \: will \: \: decrease}}} } \: \: \huge \color{green}\degree \degree \circ[/tex]

We know that,

[tex]\large \boxed{ \mathrm{pressure = \frac{mass}{area \: \: of \: \: surface}} }[/tex]

Now, we can observe that the area of surface is inversely proportional to the pressure, Therefore pressure will change opposite to the change in surface area in contact.

So, if we increase the surface area then there would be decrease in magnitude of pressure.

[tex] \large { \mathfrak{hope \: \:i t \: \: helps \: \: you..... }}[/tex]

Answer:

The two of the following measurements, when taken together, would allow engineers to find the total mechanical energy dissipated during the skid

B. The contact area of each tire with the track.

C. The co-efficent of static friction between the tires and the track.

D. The co-efficent of static friction between the tires and the track.

Explanation:

Answer:

momentum (d) it's s preety easy haaaaaaaa

Explanation:

step by step explanation

Answer:

v = 16.58 m/s

Explanation:

Given that,

Mass of a bird, m = 1.6 kg

Kinetic energy of the bird, K = 220 J

We need to find the speed of the bird. The formula for the kinetic energy is given by :

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

Where

v is the speed of the bird

So,

[tex]v=\sqrt{\dfrac{2E}{m}}[/tex]

Put all the values,

[tex]v=\sqrt{\dfrac{2\times 220}{1.6}}\\\\v=16.58\ m/s[/tex]

So, the speed of the bird is equal to 16.58 m/s.

Answer:

A is the correct answer 0.158

158 Milligrams of salt are on the table there would be 0.158 grams of salt on the table, therefore the correct answer is option A.

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.

As given in the problem 158 Milligrams of salt are on the table, then we have to find out how many grams of salt is on the table,

1000 milligrams = 1 gram

1 milligram = 1 / 1000 grams

158 milligram = 158 × 1 / 1000 grams

                      =0.158 grams

Thus, there would be 0.158 grams of salt on the table, the correct answer is option A.

To learn more about the unit of measurement from here, refer to the link;

brainly.com/question/12629581

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The question is incomplete the complete question is,

158 Milligrams of salt are on the table. How many Grams of salt is on the table?

a .158 g

b 1.58 g

c 15.8 g

d 1,580 g

Answer:

How big the city because it could be a big all city