Answer:
f = 409.6 Hz, the woman hears a higher frequency sound
Explanation:
This is a Doppler effect problem, which is described by the equation for the case of a fixed observer
f = fo [tex]\frac{v}{v \pm v_s}[/tex]
where the negative sign is for the source approaching the observer
in this case the car is the one that emits the sound and moves away from the intersection
let's calculate
f = 400 [tex]\frac{343}{343-8}[/tex]
f = 409.6 Hz
therefore the woman hears a higher frequency sound
Cart 1 of mass 3.0 kg moving to the right at 2 m/s and collides with a Cart 2 of mass 2.0 kg moving to the left at
4 m/s. The two carts stick together. What is the velocity of the carts after the collision?
Answer:
V = -0.4 m/s
Explanation:
Given that,
Mass of cart 1, m₁ = 3 kg
Speed of cart 1, v₁ = 2 m/s
Mass of cart 2, m₂ = 2 kg
Speed of cart 2, v₂ = -4 m/s (left)
aWe need to find the velocity of the carts after the collision if they stick together. Let the common speed be V. Using the law of conservation of momentum to find it such that,
[tex]m_1v_1+m_2v_2=(m_1+m_2)V\\\\V=\dfrac{m_1v_1+m_2v_2}{(m_1+m_2)}[/tex]
Put all the values,
[tex]V=\dfrac{3\times 2+2\times (-4)}{(3+2)}\\\\=-0.4\ m/s[/tex]
So, the velocity of the carts after the collision is equal to 0.4 m/s to the left.
Which applications, either for diagnostic purposes or for therapeutic purposes, involve the use of X-rays? Check all that apply.
CT scan
MRI
radiography
brachytherapy
laser eye surgery
radioisotope imaging
external beam radiation therapy
fluoroscopy
Answer:
1,3,7,8
Explanation:
Edge 2021
why VR is always less than 1 in Third class lever?
"The gravity of body is not necessary on body. " justify
Answer:
Answer: there are two factors on which centre of mass depends
*its shape and
*the way mass distributed on its shape.
These two factor decide whether centre of mass of gravity lie inside the body or outside the body.
If the body is regular the centre of mass lies inside the body if it is not regular then it lies outside the body
Explanation:
What device increases voltage?
A. generator
B. motor
C. step-down transformer
D. step-up transformer
Your answer would be C.
A step-up transformer is a transformer that raises voltage from main to secondary by having more secondary winding turns than primary winding turns.
Hope this helps; have a great day!
Comet is seen after a long period of time. Why?
Answer:
Long-period comets have orbital periods longer than 200 years. ... Since it is the sublimation of these volatiles from the nucleus of the comet as it nears the Sun that gives rise to the coma and highly-visible tails, long-period comets have more material with which to put on a show.
Explanation:
A 75N horizontal force is sufficient to move a 150N box on a level road at a uniform speed. What is the coefficient of friction between the box and the road?
Answer:
[tex]\mu_k=0.5[/tex]
Explanation:
From the question we are told that:
Force [tex]F=75N[/tex]
Weight [tex]W=150N[/tex]
Generally the equation for coefficient of friction [tex]\mu_k[/tex] is mathematically given by
[tex]\mu_k=\frac{F}{mg}[/tex]
[tex]\mu_k=\frac{75}{150}[/tex]
[tex]\mu_k=0.5[/tex]
Kinetic energy is exchanged when _____ happens?
A) Drip
B) Conversation
C) Contact
D) Boredom
A force of 70 N is applied to a 28 kg rock causing it to slow down from 25 m/s to 15 m/s, a change in velocity of 10 m/s. How long was that force applied?
Answer: 4 s
Explanation:
Given
The applied force is 70 N
mass of the rock is 28 kg
initial velocity [tex]u=25\ m/s[/tex]
final velocity [tex]v=15\ m/s[/tex]
Deceleration provided by force is
[tex]a=-\dfrac{70}{28}=-2.5\ m/s^2[/tex]
using the equation of motion
[tex]v=u+at\\\Rightarrow 15=25-2.5t\\\Rightarrow 2.5t=10\\\Rightarrow t=4\ s[/tex]
4. Priya notices thet the pressure inside one of her car tyres is too low. She pumps up the tyre to a higher pressure. a) What happens to the number of particles in the car tyre? b) What happens to the distance between particles as pressure increase? c) One of the tyres gets a puncture(small hole) . What happens to the pressure inside the tyre?
Answer:
a) the number of particles increases
b) average distance between them should decrease
c) the number of particles decreases, the pressure must also decrease
Explanation:
a) When the girl pumps to increase the pressure inside the tire she introduces more particles. Therefore the number of particles increases
b) as the volume of the tire does not change and there are more particles, the average distance between them should decrease
c) When a hole is opened, some of the particles inside the tire come out, so as the number of particles decreases, the pressure must also decrease
Inside a dark room, pull a strip
of Scotch tape from the roll
very quickly. What did you see?
How do we use pulleys in real life?
Answer:
Construction pulleys are used in order to lift and place heavy materials. Curtains at a theatre are moved using pulley systems that pull the curtains apart. Blinds on windows operate using a pulley system to move the blinds up and down.
We use pulleys for things like and elevators, cranes, and bikes.
Kyle is playing volleyball. After he hits the ball, it reaches its maximum height and then falls toward the ground due to the force of gravity.
Which statement best describes the interaction between the ball and Earth?
The ball and Earth attract each other with equal magnitudes of gravitational force.
O
The ball and Earth produce equal magnitudes of gravitational acceleration on each other.
The gravitational force exerted by the ball is much less than the gravitational force exerted by Earth.
Earth exerts a gravitational force on the ball, but the ball is too small to exert a gravitational force on Earth.
Which table is it I’ll mark brainlest
Answer:
we need the graph to answer the question.
Hey, can someone solve this for me? tysm
Answer:
The Answer is gonna be B. The normal force (magnitude and direction)
Answer:
solution given ;
mass[m]=55kg
acceleration due to gravity [g]=10m/s²
weight[W]=mg=55×10=550 Newton
A strand of 10 lights is plugged into a outlet. How can you determine if the lights are connected in series or parrel
Answer:
C) Unscrew one light. If the other lights turn off, it's a series circuit.
Explanation:
THIS IS THE COMPLETE QUESTION BELOW;
A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel? A) Unscrew one light. If the other lights stay on, it's a series circuit. B) Unplug the strand. If the first light stays on, it's a series circuit. C) Unscrew one light. If the other lights turn off, it's a series circuit. D) Cut the strand in half. If the plugged in half stays on, it's a series circuit.
SERIES CIRCUIT
In this circuit, the components there are in the same path, the entire circuit has the same current, each of the components posses different voltage drop. Hence, failure of one components to work, there will be break in entire circuit then other components cease to work.
PARALLEL CIRCUIT
This circuit has equal voltage drop across all the components, any problem in a component will not has effect on other components.
Therefore, if one want to determine if a light connection is in series or in parallel, one of the light can be unplugged if others stop working it means it's series, if other works it's parallel.
What is the average speed of inchworm 1 at 2 minutes?
I made the chart as clear as I could.
Answer: 2
Explanation:
The average speed of the inchworm 1 at 2 minutes in the given graph is determined as 0.025 m/s.
What is average speed?The average speed of an object is the rate of change of displacement of the object with time.
The average speed of the inchworm 1 at 2 minutes is calculated as follows;
v = D/t
v = 3 m/(2 min x 60 s)
v = 0.025 m/s
Thus, the average speed of the inchworm 1 at 2 minutes is 0.025 m/s.
Learn more about average speed here: https://brainly.com/question/6504879
Um veiculo aumenta sua velocidade de 15/s para 20m/s num intervalo de tempo de 10s.Nesse intervalo de tempo ,qual foi sua aceleração média?
Answer:
Aceleración media = 0.5 m/s²
Explanation:
Dados los siguientes datos;
Velocidad inicial = 15 m/s
Velocidad final = 20 m/s
Tiempo, t = 10 segundos
Para encontrar la aceleración;
Aceleración se puede definir como la tasa de cambio de la velocidad de un objeto con respecto al tiempo.
Esto simplemente significa que la aceleración viene dada por la resta de la velocidad inicial de la velocidad final a lo largo del tiempo.
Por lo tanto, si restamos la velocidad inicial de la velocidad final y la dividimos por el tiempo, podemos calcular la aceleración de un objeto. Matemáticamente, la aceleración viene dada por la fórmula;
[tex] Aceleracion = \frac{final \; velocidad - inicial \; velocidad}{tiempo}[/tex]
Sustituyendo en la fórmula, tenemos;
[tex] Aceleracion = \frac{20 - 15}{10}[/tex]
[tex] Aceleracion = \frac{5}{10}[/tex]
Aceleracion = 0.5 m/s²
Por tanto, la aceleración media es igual a 0.5 metros por segundo al cuadrado.
a change in earths total isolation would be caused by _____?
Answer:
sunspots
Sunspots are areas in the sun that has a magnetic field is about 2 thousand times stronger than Earth's. Also is much higher than anywhere else on the Sun.
The electric force between two charged objects is 64 N. What will be the magnitude of the electric force if the distance between these two
charges is cut in half?
A body contains charge of 10 micro coulomb. After conduction, the charge on the body becomes -2.8 micro coulomb. The number of electrons gained by this charged body
Answer:
[tex]n=4.5\times 10^{13}[/tex]
Explanation:
Initial charge, [tex]q_1=10\mu C[/tex]
After conduction, charge on the body becomes, [tex]q_2=-2.8\mu C[/tex]
We need to find the number of electrons gained by this charged body.
Net charge,
[tex]q=q_1+q_2\\\\=10+(-2.8)\\\\=7.2\ \mu C[/tex]
Let n be the number of electrons gained by this charged body. So,
[tex]q=ne\\\\n=\dfrac{q}{e}\\\\n=\dfrac{7.2\times 10^{-6}}{1.6\times 10^{-19}}\\\\=4.5\times 10^{13}[/tex]
So, [tex]4.5\times 10^{13}[/tex] electrons gained by this charged body.
Which of these chemical formulas is balanced?
The balanced formula is B.
GIVING EASY BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 26pts-
Answer:
Y
Explanation:
The fulcrum is the point where the scissor blades are joined together. The force or effort is the end or handle of the scissors. The parts of a pair of pliers are similar to the scissors.
which car has the most kinetic energy ??
A. a car mass 1400 kg with speed 4 m/s
B. a car mass 1300 kg with speed 3 m/s
C. a car mass 1500 kg with speed 5 m/s
D. a car mass 1200 kg with speed 2 m/s
it's C
because the faster an object moves the more kinetic energy it has.
2. The frequencies of radio waves range from 3x10^5Hz to 3x10^7Hz. What is the
range of wavelengths of these waves? Use 3x10^8m/s as the speed of electromagnetic
waves.
Answer:
10 m to 1000 m
Explanation:
Using,
V = λf........... Equation 1
Where V = speed of electromagnetic wave, λ = wavelength, f = frequency
λ = V/f.......... Equation 1
Given: v = 3×10⁸ m/s, f = 3×10⁵ Hz to 3×10⁷ Hz
From the question,
The lowest wavelength is
λ' = 3×10⁸/3×10⁷
λ' = 10 m
While the highest wavelength is
λ = 3×10⁸/3×10⁵
λ = 1000 m
Hence the range of wavelenths of the eave is 10 m to 1000 m
If time is tripled and work remains the same the power will.
Answer:
power will three times decrease (one-third)
Explanation:
P = W / t
thus when work is constant, power is inversely proportional to time
so, when time is tripled, power is decreased to one-third
can any one give me a good egg drop design that is over 500 grams?
Answer:
Hightail ur butt to walmart and get a squash, cut off the top and scoop out a hole the size of the egg, put the egg in but make sure there's as little space as it can be so the egg wont move around in it, then put the top of the squash back on and cover it in duct tape to keep the top from flying off.
Explanation:
Un puente(construido de acero) que conduce hacia una bahía mide 1.30X10-3m entre sus torres de apoyo. ¿Cuánto se dilata el puente durante un día en el que la temperatura alcanza una diferencia de 30°C?
Answer:
ΔL = 0.429 m
Explanation:
The expression for linear thermal expansion is
ΔL = α L₀ ΔT
the coefficient of linear expansion of steel is 11 10⁻⁶ ºC⁻¹
the initial length of the bridge is L₀ = 1.30 10³ m and the temperature variation is ΔT = 30 ºC
calculate
ΔL = 11 10⁻⁶ 1.30 10³ 30
ΔL = 4.29 10⁻¹ m
ΔL = 0.429 m
How is cell division different for a unicellular organism than it is for a cell in a multicellular organism?
Explanation:
Cells are divided by the reproductive means in unicellular organisms; whereas in multicellular organism they are the means for tissue development and maintenance in multicellular organisms. In adults, tissue renewal rather than development is the most common cell division in which several forms of cells are constantly replaced.
Help pls !!!
Which statement is true for nuclear reactions but not for chemical reactions?
Answer:
its c
Explanation: