A woman is sitting at a bus stop when an ambulance with a siren wailing at 440 Hz approaches at 31.5 m/s (about 70 mph). Assume the speed of sound to be 343 m/s.
(a)
What frequency (in Hz) does the woman hear?

(D) The electric potential at the point P is +1.6 kQ/R.

The electric potential of a given charged body is the work done in bringing the charge from a point to a given location in the electric field.

Mathematically, electric potential is given as;

V = kq/r

where;

The distance of each of the negative charge to point P is calculated as follows;

r = √(R² + R²)

r = √(2R²)

r = R√2

The electric potential from each negative charge to point P;

V = -kQ/(R√2)

For the two charges = - 2kQ/(R√2)

The electric potential from 3Q

V = (k3Q) / R

V = (3kQ)/R

The total electric potential;

V(net) =  (3kQ)/R - 2kQ/(R√2)

V(net) =  (3kQ)/R - (1.414kQ)/R

V(net) = +1.6 kQ/R

Thus, we can conclude that the sum of the sum of the electric potential at point must be positive since it is directed to the positive y-direction.

Learn more about electric potential here: https://brainly.com/question/14306881

#SPJ1

Answer:

50 N

Explanation:

The change in momentum in this case can be calculated in this way

Impulse (Ns) = force (N) X time (s)

We have Impulse and time here:

10Ns= force X 0.2s

We rearrange the formula to get force

10 ÷ 0.2 = 50

Therefore average force is 50N

Answer:

Like trees, houses, and people, anything outside is at risk of being struck by lightning when thunderstorms are in the area, including cars. The good news though is that the outer metal shell of hard-topped metal vehicles does provide protection to those inside a vehicle with the windows closed.

Answer: Depends

Explanation:

You should be good if you have proper shelter and protection to maintain safety.

If it's hail, it's probably best to find shelter and I recommend putting a thick blanket on the windows so they don't burst.

Cindy's average speed for the entire run is 200 m per min.

What is Cindy's average speed for the entire run?

First, to measure Cindy's average speed, we need to know that the average speed of Cindy would be the total distance she had covered while running by the total amount of time it took her to cover the distance. So, we need to measure her average rate of speed over the extent of her runs.

In order to calculate average speed we will calculate the total distance in meters traveled by Cindy.

Given:

Total distance = 2 Km

Convert km to meter, since she is running at a different speed measured in meter.

1 km = 1,000 m

Total distance = 2 Km = 2000 m

Then, the total amount of time in minutes it took her to cover this distance is: 2 (for the first 250 m) + 4 (for the next 1,000 m) + 1 (next 350 m) + 3 (time used for rest) = 10 minutes

Average speed = total distance  / total time

Average speed = 2000 m / 10 minutes

Therefore, her average speed  = 200 m per min

In summary, Cindy, though rested for 3 minutes, maintained an average speed of about 200 m per min for the entire run.

Learn more about average speed here: https://brainly.com/question/24739297

#SPJ1

Answer:A

Explanation: i think

Answer:

1.8 m / s^2

Explanation:

F = ma       ( ignoring friction)

F/ m = a

9.7 / 5.5 = 1.8 m/s^2

The force applied to the ball from bat if the ball is in contact with the ball for only 0.0007 s is 34.29 KN

J = F * t

J = Impulse

F = Force

t = Time

J = 24 N s

t = 0.0007 s

F = J / t

F = 24 / 0.0007

F = 34.29 KN

Impulse is the rate of change of momentum in an object. It can simply be defined as force acting on an object over a period of time to change the object's momentum. So,

J = Δp = F Δt

Therefore, the force applied to the ball from bat is 34.29 KN

To know more about Impulse

https://brainly.com/question/16980676

#SPJ1

3.86×10^11 molecules of gas remain in the tube

P = nkT

n = P/kT

= hdg/kT

Number of molecules in the electron tube is = n×V = hdgV/kT

⟹n = hdg/kT

=

1.2×10^−10 ×13600 × 9.8 × 100 × 10^−6/1.38×10^−23 × 300

= 3.86×10^11

Answer:

the ball being pulled toward the ground

Explanation:

According to the given statement the charge Q is 6 coulomb that requires of energy to be moved through a potential difference .

Note that whenever a voltage is stated, it refers to the difference in potential between two places. Every battery, for instance, has two terminals, and its voltage seems to be the difference in potential between them.

The voltmeter is a tool used to measure potential difference. Some varieties, like voltmeters, feature a pointer on a dial, but digital displays are more common. To detect the potential difference across a circuit element, you must connect a voltmeter in parallel, unlike an ammeter.

W is work done

V is potential difference

Work done

W = 96J

V = 16

W=Q×V

Q=W÷V

Q =  96 ÷ 16

Q =  6 Coulomb.

To know more about Potential Difference visit:

https://brainly.com/question/12198573

#SPJ9

The category with the lowest joint relative frequency is Chocolate cupcakes with vanilla buttercream.

Relative frequency = Subgroup frequency / Total frequency

Some of the relative frequencies are given. From that we can find the remaining frequencies using basic addition and subtraction.

                                                 Vanilla     Chocolate      Total

Vanilla Buttercream                    0.15            0.06           0.21

Cream Cheese Icing                   0.19            0.14            0.33

Cookie Butter Buttercream        0.26           0.20           0.46

Total                                             0.60           0.40           1.00

Joint relative frequency = Joint frequency / Total frequency    

The joint relative frequency of

Therefore, the category with the lowest joint relative frequency is Chocolate cupcakes with vanilla buttercream.

To know more about Relative frequency

https://brainly.com/question/16832475

#SPJ1

As we carry out the experiment, the independent variable here is the he increase in temperature of the block of iron.

In many instances, it is very important for us to be able to understand the cause and effect relationship that is likely to exists between two variables. The only way that we could be able to in fact deduce the cause and effect relationship that does exist when we have two variables is by the use of an experiment.

Hence, when ever we are doing an experiment there must be an independent variable as well as well as a dependent variable. The variable that we are manipulating in the experiment is the independent variable. The dependent variable changes as we manipulate the independent variable.

As such, in the case of this experiment, the independent variable here is the increase in temperature of the block of iron.

Learn more about independent variable:https://brainly.com/question/1479694

#SPJ1

Answer: False

Explanation: the equator receives the most sun light because the the equator is closest to the sun.

Acceleration of the rabbit, moving in the positive x-direction at 1.50 m/s when it spots a predator and accelerates to a velocity of 12.1 m/s along the positive y-axis, all in 2.20 s is given by in x direction 0 m/sec² in y direction is 5.50 m/sec².

The rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.

Given in the question rabbit is initially moving with speed 1.50 m/sec in x direction after rabbit spot predator start accelerating in y direction to velocity 12.1 m/sec in 2.20 m. so acceleration in x direction will be zero.

Acceleration in y direction is 5.50 m/sec².

Acceleration in x direction will be zero.

Acceleration in y direction is 5.50 m/sec².

To learn more about acceleration refer to the link:

brainly.com/question/12550364

#SPJ1

The small rocket will be take time 1296 sec.

We are given that,

The thrust of the rocket  = F = 35N

The velocity of the rocket = v = 0.63m/s

The mass of the satellite = m = 72000kg

Therefore , to get time t of the rocket when it would be fired and we use the equation such as , the product of the mass and velocity of an object i.e. known as momentum (p).

p = mv

Where p is the momentum of the rocket, m is the mass and v is the velocity of the rocket.

Since , here we can write Newtonian relations such as, Momentum is equivalence as a function of Force (F) and time (t) which is given as,

p = F t

So that from above two equation we can write as,

mv = Ft

t = mv/F

t = {(72000kg) ×(0.63m/s)}/35N

t = 1296 sec

Therefore, the rocket will be fired in 1296 seconds.

To know more about time

https://brainly.com/question/14122438

#SPJ1

Be [purple], Ca [black] and Sr [blue] are the elements in order of increasing size.

Brittle is not the property of metals.

The strong electrostatic force of attraction that is present in metal ions when they are surrounded by a large number of electrons. It is actually very strong and flexible at the same time. So, when we apply a force on the metals, they can be transformed into flat and smooth sheets that can be drawn into wires and they are hard to break into pieces.

Beryllium is an element that is present in the second period while on the other hand, calcium element is present in the next period and Sr element is also present in the lower period of periodic table. We know that when we move down the group, the number of shells increases which ultimately leads to increase in atomic size.

So we can conclude that the elements in order of increasing size are Be [purple], Ca [black] and Sr [blue]. The property which is not present in metals is the property of metals.

Learn more about metals here: https://brainly.com/question/4701542

#SPJ1

The additional information needed to calculate the acceleration of the motorcycle is the time taken to complete the distance.

Acceleration is the amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).

The acceleration of a moving body can be calculated by dividing the change in velocity of the motion (∆V) by the time taken to complete the motion as follows:

Acceleration (m/s²) = change in velocity (m/s)/time(s)

According to this question, a motorcyclist is traveling in the positive direction at a velocity of 7.0 meters per second. She then increases her velocity to 9.0 meters per second. This means that the change in velocity {∆V} is 2m/s.

However, the time taken to complete the distance is still required to compute the acceleration of the motorcycle.

Learn more about acceleration at: https://brainly.com/question/12550364

#SPJ1

The x and y components of the velocity vector is 17.32 m/s and 10 m/s respectively.

The x-component of the ball's velocity is the velocity of the ball in the horizontal direction or x-axis.

The velocity of the ball in x-direction is calculated as follows;

Vx = V cosθ

where;

Vx = (20 m/s) x (cos 30)

Vx = 17.32 m/s

The velocity of the ball in y-direction is calculated as follows;

Vy = V sinθ

where;

Vy = 20 m/s x sin(30)

Vy = 10 m/s

Learn more about x and y components of velocity here: https://brainly.com/question/18090230

#SPJ1

Given:

car is parked ouphill on a sloped street.

To draw the free body diagram.

Explanation:

he ffree-bodydiagram of the car is shown below.

Here, W is the force due to gravity which is its weight.

There is a frictional force, f acting towards the slope.

N is the normal force.

The car will remain at rest if no force is acting on the body.

The weight can be resolved into sine and cosine components.

The horizontal component of weight cancels out the normal force and the vertical component of weight cancels the frictional force.

Thus, the car is at rest as no net force is acting on it.

The coefficient of linear expansion, given that the length of the pipe increased by 1.5 cm is 1.67×10¯⁵ /°F

From the question given above, the following data were obtained

The coefficient of linear expansion can be obtained as illustrated below:

α = ∆L / L₁∆T

α = 0.015 / (10 × 90)

α = 0.015 / 900

α = 1.67×10¯⁵ /°F

Thus, we can conclude that the coefficient of linear expansion is 1.67×10¯⁵ /°F

Learn more about coefficient of linear expansion:

https://brainly.com/question/28293570

#SPJ1

The temperature change in the lead immediately   ∆T=1.56 K.

Temperature is a physical amount that expresses the hotness of a count number or radiation. There are 3 sorts of the temperature scale.

Temperature is a measure of the common kinetic power of the particles in an item. when the temperature will increase, the motion of the debris also increases. Temperature is measured with a thermometer or a calorimeter.

Temperature is a degree of the common kinetic strength of the particles of a substance. The higher the temperature of an item, the better its kinetic strength. Kinetic electricity is a form of electricity related to movement.

a.  ΔQ=mgh

ΔQ=0.5×9.80×20

ΔQ=98 J.

⇒∆U= ∆Q

⇒∆W=0

d. The temperature change is ∆T=1.56 K

Learn more about temperature here:-https://brainly.com/question/24746268

#SPJ1

Weight is the gravitational force with which the earth pulls an object towards it whereas, Mass is a quantity representing the amount of matter in a particle or object.

hope this helps and you need a chair for sitting xD -,-

Dependence:

-Area

-Separation

-Medium

Independent from:

-Charge

-Electric potential

-Metal

If the Hubble Space Telescope has a resolution of about 0.05, then the size of the smallest feature it can distinguish on the surface of Mercury, at closest approach to Earth is 92 m.

What is the earth?

The Earth is described as an ellipsoid with a circumference of about 40,000 km. The earth found is the densest planet in the Solar System and it is also the largest of the four rocky planets.

The Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy.

Learn more about the earth at: https://brainly.com/question/746553

#SPJ1

Rusting is referred to as a example of oxidation reaction in this type of context.

This is a type of chemical change which involves the loss of electrons and contact with oxygen molecules. When this occurs, the element becomes oxidized  with the symbol O which is being used to denote it. The main factor which is considered about the oxidation process is the availability of oxygen.

Rusting on the other hand is referred to as iron oxide which occurs during the reaction between iron and oxygen and the color changes into reddish brown which signifies this process.

Read more about Oxidation here https://brainly.com/question/13182308

#SPJ1

Answer:

[tex] \small \fbox{\sf Option C, D and E are the correct answer.}[/tex]

Explanation:

The gravitational force of attraction between any two masses is given by the formula,

[tex]F = G \frac{m_1 \cdot m_2}{r^2}[/tex]

Where,

From above relation we can conclude that,

Hence, the greatest amount of gravitational force between a planet and it's moon would be largest when,

Option C, D and E are the correct answer.

[tex]\sf \small \pink{Thanks }\: \green{for} \: \blue{joining} \: \orange{brainly } \: \red{community}![/tex]

The force that was needed to stop the bus of mass 5000 kg that stops after 25 m in 5 s is 5000 N.

a = v / t

v = d / t

a = Acceleration

v = Velocity

d = Distance

t = Time

d = 25 m

t = 5 s

v = 25 / 5

v = 5 m / s

a = 5 / 5

a = 1 m / s²

According to Newton's second law of motion,

F = m a

F = Force

m = Mass

m = 5000 kg

F = 5000 * 1

F = 5000 N

The given question is incomplete. The complete question is:

A bus of mass 5000 kg applies brake and stops after 5 seconds and the bus stops at distance of 25 meters, calculate the force that was needed to stop the bus in N

Therefore, the force that was needed to stop the bus is 5000 N

To know more about Newton's second law of motion

https://brainly.com/question/13447525

#SPJ1