Answer:
The frequency heard by the observer will be "7351.35 Hz".
Explanation:
The given values are:
Source,
[tex]V_s=30 \ m/s[/tex]
Frequency of source,
[tex]F_s=8000 \ Hz[/tex]
Speed of sound,
[tex]C=340 \ m/s[/tex]
As we know,
⇒ [tex]F=(\frac{C+V_r}{C+V_s} )F_s[/tex]
Here,
[tex]V_r=0[/tex]
So that the formula will be:
⇒ [tex]F=(\frac{C}{C+V_s} )F_s[/tex]
[tex]=\frac{340}{340+30}\times 8000[/tex]
[tex]=7351.35 \ Hz[/tex]
A truck traveling at a velocity of 33m/s comes to a halt by decelerating at 11m/s^2. How far does the truck travel in the process of stopping. identify known variables such as V, V0, a, t, and delta x.
Answer:
The truck was moving 16.5 m/s during the time it took to stop, which was 3 seconds.
Initial velocity = 33 m/sFinal velocity = 0 m/sAverage velocity = (33 + 0) / 2 m/s = 16.5 m/sExplanation:
First, how long does it take the truck to come to a complete stop?( 33 m/s ) / ( 11 m / s^2 ) = 3 secondsThen we can look at the average velocity between when the truck started decelerating and when it came to a complete stop. Because the deceleration is constant (always 11m/s^2) we can use this trick.The time taken to stop the truck is 3 seconds. The final velocity is zero. Then, the distance travelled by the truck is 49.5 m.
What is acceleration ?Acceleration is a physical quantity that, measures the rate of change in velocity. It is a vector quantity thus having both magnitude and direction. It can be defines as the ratio of change in velocity to the change in time.
Given initial velocity = 13.5 m/s
final velocity is zero since the bicycle is stopping.
then Δt = Δv/a
Δt = 33 m/s/ 11 m/s² = 3 seconds.
Hence, the truck will take 3 s to complete stop.
The distance covered within this time can be determined using the equation as follows:
s = u t + 1/2 at²
where u is the initial velocity
The acceleration a = - 11 m/s² the minus sign is due to deceleration.
s = (33m/s × 3 s) + (-11 m/s² ×3 s ×3 s) = 49.5 m.
Therefore, the truck will travel up to 49.5 m before stopping.
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1) A long distance runner travels 32 miles in a straight line for 4.0 hours.
What is their velocity? (20 pts)
Draw: (1 pt)
Data: (3 pts)
Given:D= 32 miles
T=4 hours
Unknown:S=?
Formula (2 pts)
V=D/T
Substitution of data with units in formulas: (1 pt)
V=3274
Solve (1 pt)
Write down answers with correct units. Circle your answer. (2 pts)
Answer:
3.57632 m/s im not 100% sure but i think thats the answer
Explanation:
Exercise Book: 18
A piece of
radioactive material contains
2000 atoms. If its half life is 20 seconds
the time take for 125 atoms to remain is?
Question 3 (1 point)
Select the best answer from the choices below. When the wavelength decreases, the frequency.
a
Increases
Оооо
Decreases
Remains the same
с
d
Stops
Explanation:
the frequency remains the same
help me to answer this please
Answer:
ok
Explanation:
What is a translucent object?
an object that isn't completely transparent or opaque kinda the middleground
it allows light through but it's not clear
In a complete description of a force vector, which is usually not necessary?
O A. magnitude
O B. direction
OC. type
O D. units
In the complete description of a force vector, type is usually not necessary. Thus, the correct option is C.
What is Force vector?A force vector is a representation which has both the magnitude and direction of the force. Such a vector is typically represented through an arrow in the direction of the force applied and with a length which is proportional to the magnitude of the force.
If a force is applied on an object, this causes movement of the object in a given direction and the wind applies a force on it at an angle, and the new motion will be as that of a force which was applied in that direction.
Therefore, the correct option is C.
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Which of the following is not a tectonic activity?
A.Volcanoes
B.Mountain Building
C.Erosion of mountains
D.Earthquakes
Answer:
Erosion of Mountains
Explanation:
Answer:
c gimme brainliest I'm right
The table shows experimental data of the magnitude of four forces exerted on a 2kg object as it slides across a horizontal surface. Which of the following could represent the magnitude of the net force that is exerted on the object? Select two answers.
Answer:
6N and 10N
Explanation:
The forces acting along the horizontal axis arw the horizontal force applied and the frictional force.
Frictional force is a force that opposes the horizontal force (moving force)
First we need to get the sum of force along the horizontal as shown
\sum Fx = Horizontal force - frictional force
\sum Fx = 8N - 2N
\sum Fx = 6N
Hence one of the magnitude of the net force exerted on the object is 6N
For the forces along the vertical component;
The forces are the weight, force of gravity(acting downward) and the normal force acting upward
Given
Weight = mass × acceleration die to gravity
Weight = 2×10 = 20N
Normal force = 10N
\sum Fy = (weight)-normal force
\sum Fy = (20)-10
\sum Fy = 20-10 = 10N
Hence the other net force acting on the object is 10N
The required options are 6N and 10N
Hillary is dropping objects that are the same volume. She wants to investigate how an object’s mass affects the average speed at which it travels when dropped, until it hits the ground. Which variable must Hillary change during the experiment?
A. the timer
B. the drop height
C. the mass of the object
D. the place where she drops it
Answer:
letter C. The mass of the object.
Explanation:
i hope it helps.
Compare an object sliding across carpet and that same object sliding across a bare floor. Why is the object quicker to slow down on carpet than on the bare floor?
Please answer this!
Answer:
it is friction
Explanation:
An object traveling at a constant velocity has no net force. True or False
Which is true A. You can see both lunar and solar eclipses from outside the shadow.B. You can see neither lunar and solar eclipses from outside the shadow. C. You can see only lunar from outside the shadow. D. You can see only solar eclipses from outside the shadow. .plz.help
Answer:
A
Explanation:
A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
Anyone knows how to do this? I think it’s 0 because it’s not moving————
Answer:
1 m/s
Explanation:
2 to 3 second interval would be zero.
3 to 4 is 2 m/s
so average is 1 m/s
Three pucks A, B, and C are shown sliding across ice at the noted speeds. Air and ice friction forces
are negligible (they are assumed to not exist) Rank the forces needed to keep them moving
greatest to least. You must justify your answer
A=2 m/s
B= 4 m/s
C=6 m/s
The puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.
Applied force
The force needed to stop the pucks or applied to stop the pucks is determined by applying Newton's second law of motion as shown below;
F = ma
F = mv/t
where;
F is the applied forcem is the mass of the pucksv is the speed of the puckst is the timeFrom the quation above, the applied force is directly proportional to the speed of the pucks. Thus, the greater the speed of the puck, the greater the required force to stop the puck.
Therefore, the puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.
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what body part plays a strong role in releasing power
Answer:
I think your bones, muscles, and joints your welcome :)
Explanation:
Lauren throws her first pitch of the season for her school's softball team. If the ball travels 80 feet and takes 1.58 seconds to travel this distance, what is the speed of the ball? Round you answer to the nearest hundredth.
Answer:
50.63 ft/s (2dp)
Explanation:
Speed = Distance/Time
80/1.58 = 50.63291139
= 50.63 ft/s (2dp)
When you travel 20km in 1 hour, at what speed do you travel.
Answer:
at 20km/h
Explanation:
Ella rode her bike 5 miles in 30 minutes. What was Ella's average speed in miles per hour? (pls helppp!)
Answer:
6 minutes per mile
Explain Kinetic and potential energy
Answer:
Energy implies as the object’s capability to perform work. It is something that cannot be created or destroyed but can only be transformed. An object loses its energy, when it performs work, whereas it gains energy when the work is performed on it. Energy is broadly classified as kinetic energy and potential energy. While kinetic energy is the energy which an object contains because of a particular motion.
On the other hand, potential energy is the stored energy, because of its state of rest. As both the two forms of energy are measured in joules, people get easily confused between these two. So, take a read of the article which will help you to understand the differences between kinetic and potential energy.
Explanation:
Hope this helps - Good luck ^w
Answer:
Energy stored in an object due to its position is Potential Energy. · Energy that a moving object has due to its motion is Kinetic Energy.
Explanation:
During a race, a sprinter increases from 4.0 m/s to 6.0 m/s over a period of 1.5 s. What is the sprinter’s average acceleration during this period? (10 Points) 1 meter per second squared 1.3 meters per second 2.0 meters per second 1.3 meters per second squared
Answer:
[tex]a=1.3\ m/s^2[/tex]
Explanation:
It is given that,
Initial velocity, u = 4 m/s
Final velocity, v = 6 m/s
Time, t = 1.5 s
We need to find the average acceleration of a sprinter during this period. We know that the rate of change of velocity of an object is equal to its acceleration. So,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{(6-4)\ m/s}{1.5\ s}\\\\a=1.33\ m/s^2[/tex]
So, the acceleration of the sprinter is [tex]1.33\ m/s^2[/tex]. Hence, the correct option is (d).
A block weighing (Fg) 100 N is resting on a steel table (us = 0.68)
The minimum force to start this block moving is. N.
Answer:68
Explanation:
6.8x100
We have that for the Question "A block weighing (Fg) 100 N is resting on a steel table (us = 0.68) ." it can be said that
The minimum force to start this block moving is [tex]F_{min}=37N[/tex]
From the question we are told
A block weighing (Fg) 100 N is resting on a steel table (us = 0.68)
The minimum force to start this block moving is. N.
Generally the equation for the Maximum force is mathematically given as
[tex]F_{max} =0.74*50\\\\F_{max} =37N[/tex]
Therefore
The Minimum force = max Frictional force
Therefore
[tex]F_{min}=37N[/tex]
Hence
The minimum force to start this block moving is [tex]F_{min}=37N[/tex]
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We can see Newton’s 3rd law everyday when what ?
Answer:
answer down below
Explanation:
hi! newton's third law applies to a lot of things. this is shown when we jump, bounce a ball, or push something, for example. the law states that for every action, there an equal and opposite reaction. when you bounce a ball, it bounces back up at the same force at which you dropped it.
hope this helps!
Help Plsss
Which of the following objects are subject to the law of universal gravitation? (circle all that apply)
a. Satellites
b. Water
c. Frogs
d. Stars
What is Speed? the ability to rest the ability to rest the ability to minimize the time cycle of a given movement the ability to minimize the time cycle of a given movement the ability to apply force the ability to apply force the ability to use oxygen?
Answer:
Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time.
Explanation:
The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time.
1. During an accident investigation, a detective measures the skid marks that a car
left to determine how fast it was initially moving before stopping when it hit a
light pole. The detective measures the distance to be 40 meters. The detective
receives the car's braking acceleration to be 4.57m/s2 from the manufacturer's
manual. Help the detective by solving how fast the car was initially going before
he hit the light pole? Someone please help I’ll give you a brainlest
Answer:
19.12 m/s.
Explanation:
The following data were obtained from the question:
Final velocity (v) = 0 m/s
Breaking Acceleration (a) = – 4.57 m/s²
Distance (s) = 40 m
Initial velocity (u) =.?
The initial velocity of the car can be obtained as illustrated below:
v² = u² + 2as
0² = u² + (2 × –4.57 × 40)
0 = u² + (– 365.6)
0 = u² – 365.6
Collect like terms
u² = 0 + 365.6
u² = 365.6
Take the square root of both side
u = √365.6
u = 19.12 m/s
Therefore, the car was initially moving at 19.12 m/s.
What would the density of a liquid that has a mass of 275 grams and a volume of 200 mL?
Answer:
Mathematically: D = m/v. If you know what liquid you have, you can look up its density in a table. Once you know that, all you have to do to find the mass of the liquid is to measure its volume. Once you know density and volume, calculate mass using this relationship: mass = density • volume
Explanation:
How much kinetic energy does a baseball with a mass of 0.143 kg have it it is traveling at a velocity of 41.1 m/s?
89.7 Joules
108 3 Joules
156.6 Joules
120.8 Joules
Answer:
E = 120.77 J
Explanation:
Given that,
Mass of a baseball, m = 0.143 kg
Velocity of a baseball, v = 41.1 m/s
We need to find the kinetic energy of the baseball. We know that the kinetic energy of an object is associated with its motion. It can be given by the formula as follow :
[tex]E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.143\ kg\times (41.1\ m/s)^2\\E=120.77\ J[/tex]
So, the kinetic energy of the baseball is 120.77 J.
The kinetic energy of the baseball is 120.8 J.
What is kinetic energy?The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as
K.E = 1/2 mv²
Given is the Mass of a baseball, m = 0.143 kg and Velocity of a baseball, v = 41.1 m/s
substitute the values, we have
K.E = 1/2 x 0.143 x (41.1)²
K.E = 120.77 J
Hence, the kinetic energy of the baseball is 120.8 J.
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Explain experimental physics.
Answer:
This is a category of physics dealing with the observable phenomena, and experimental aspects by investigation, and scientific testing to measure the properties of matter, and energy.
Answer:
Experimental physics is the category of disciplines and sub-disciplines in the field of physics that are concerned with the observation of physical phenomena and experiments.
I hope you helped^_^
Follow me for more answersWhich option gives an object's mass in SI units? O A. 8.1 m3 OB. 4.6 lb O C. 5.2 kg O D. 6.5K
Answer:
5.2kg
Explanation:
mass is measured in kilograms
therefore its si unit is kg
