A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is 346 m/s. The distance between the dog and the building is
Answer:
the answer is 173 m/s
Explanation:
the the sound traveled from the dog to the building and back to the dog in 0.5 seconds, every second passes the sound travels 346 m/s but if half a second passes then we divide 346 by 2 and get 173 m/s.
If the radio waves that are sent from the speed gun have a frequency of 400,000,002 Hz and the radio waves reflected off an approaching car have a frequency of 400,000,109 Hz, what is the speed of the car? (Hz is the SI unit of frequency, equal to cycles per second).
Answer:
40.1 m/s or 144.36 km/h
Explanation:
The equation is (v=∆ f/f) x (c/2)
V is velocity
delta f is returned frequency minus intial frequency divided by the initial frequency
c is the speed of light in m/s divided by 2
v= (400,000,109 Hz - 400,000,002 Hz)/400,000,002Hz x (299,792,458 m/s)/2
Problem
Position The figure shows a motorcyclist traveling east along a straight
road. After passing point B, the cyclist continues to travel at an average
velocity of 18 m/s east and arrives at point C2.8 s later. What is the
position of point ?
Answer:
s = 50.4 m
Hence, the point C is 50.4 m towards east from point B
Explanation:
Since, the motorcyclist travels at a constant speed in straight line towards east after point B. Therefore, we can use the following equation in this case:
s = vt
where,
s = distance covered = position of point C = ?
v = uniform speed of motorcyclist = 18 m/s
t = time interval = 2.8 s
Therefore,
s = (18 m/s)(2.8 s)
s = 50.4 m
Hence, the point C is 50.4 m towards east from point B
Which is the best reason a writer would use a unreliable narrator
Answer: Explanation:
Authors sometimes use an Unreliable Narrator to tell the story, a protagonist who can't be trusted to tell the events accurately. Either they are insane, evil, delusional, forgetful, or just plain wrong... whatever their reasons, the writer uses this technique to 'hook' the reader.
Answer: to give other characters something to react to
A 24 kg crate initially at rest on a horizontal floor requires a 75 N horizontal force to set it in motion. Once the crate is in motion, a horizontal force of 53 N keeps the crate moving with a constant velocity. Find μk, the coefficient of kinetic friction, between the crate and the floor.
Answer:
The coefficient of kinetic friction is approximately 0.225
Explanation:
The given parameters are;
The mass of the crate = 24 kg
The force required to set the mass in motion = 75 N
The force required to keep the crate in constant velocity = 53 N
We have;
Sum of horizontal forces, ∑Fₓ = 0
∑Fₓ = The force pulling thing the crate - The force of friction - The force of acceleration of the crate
The force of acceleration of the crate = 0 (Crate with constant velocity)
The force of friction = [tex]\mu_k[/tex] × N
N = The normal (acting perpendicular to the surface) force = (Here) Mass of crate × Gravity
[tex]\mu_k[/tex] = The coefficient of kinetic friction
N = 24 × 9.81 = 235.44 N
The force of friction = [tex]\mu_k[/tex] × 235.44
∴ ∑Fₓ = The force pulling thing the crate - The force of friction
∑Fₓ = 53 - [tex]\mu_k[/tex] × 235.44 = 0
53 - [tex]\mu_k[/tex] × 235.44 = 0
53 = [tex]\mu_k[/tex] × 235.44
[tex]\mu_k[/tex] = 53/235.44 ≈ 0.225
[tex]\mu_k[/tex] = The coefficient of kinetic friction ≈ 0.225.
The coefficient of kinetic friction between the crate and the floor is 0.22.
The coefficient of kinetic friction μk shows the ratio between frictional force and normal force over a body on a rough surface.
Given that:
mass of the crate = 24 kgthe horizontal force [tex]\mathbf{F_{s,max}}[/tex] = 75 NWe need to first find the coefficient of static friction (μs) to determine (μk);
Using the formula:
[tex]\mathbf{\mu_s = \dfrac{F_{s, max}}{m\times g}}[/tex]
[tex]\mathbf{\mu_s = \dfrac{75 \ N }{24 \ kg \times 9.81 \ m/s^2}}[/tex]
[tex]\mathbf{\mu_s = \dfrac{75 }{235.44}}[/tex]
[tex]\mathbf{\mu_s =0.32 }[/tex]
Now, once the crate is in motion; the horizontal force = 53 NHowever, the net force = 0; since F = Fk∴
The coefficient of kinetic friction can be computed as;
[tex]\mathbf{F = \mu_k \times N}[/tex]
[tex]\mathbf{ \mu_k = \dfrac{F}{N}}[/tex]
[tex]\mathbf{ \mu_k = \dfrac{f}{m \times g}}[/tex]
[tex]\mathbf{ \mu_k = \dfrac{53}{24 \times 9.8}}[/tex]
[tex]\mathbf{ \mu_k =0.22 }[/tex]
Therefore, we can conclude that the coefficient of the kinetic friction is 0.22
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with a velocity of 15 m/s, how long would it take the dog to run 100 meters?
Answer
6.66 seconds imma seem like an idiot if something like this is werong
Explanation:
dogg is speed
100/15
Answer:
6.67 s
Explanation:
Assuming that the velocity is constant, then the governing equation in this case is:
Distance = Velocity x Time
or
Time = Distance / Velocity
= 100 / 15
= 6.67 s
100 kg = how many pounds
Answer:
220.462 pounds exact but you can round to 220 pounds
Explanation:
Explain why the nucleus is very dense BRAINLIEST
1. How do you relate the law of inertia to the balanced and unbalanced force?
??
Explanation:
I don't get you right
A Galapagos tortoise weighs 59 Newtons (on Earth). What is its mass in kilograms?
Answer:
It is 6.02 kilograms.
Explanation:
One kilogram is equal to 9.81 Newtons. To convert Newtons to Kilograms,divide by 9.81. For instance, 20 Newtons would be equivalent to 20/9.81 or 2.04 kilograms
A hockey stick strikes a hockey puck of mass 0.17 kg. If the force exterted on the hockey puck is 35.0 N and there is a force of friction of 2.7 N opposing the motion. what is the acceleration of the hockey puck?
Choices:
0.0054 m/s^2
0.005 m/s^2
200 m/s^2
190 m/s^2
Answer:
[tex]a=190\ m/s^2[/tex]
Explanation:
Mass of a hockey puck, m = 0.17 kg
Force exerted by the hockey puck, F' = 35 N
The force of friction, f = 2.7 N
We need to find the acceleration of the hockey puck.
Net force, F=F'-f
F=35-2.7
F=32.3 N
Now, using second law of motion,
F = ma
a is the acceleration of the hockey puck
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{32.3}{0.17}\\\\a=190\ m/s^2[/tex]
So, the acceleration of the hockey puck is [tex]190\ m/s^2[/tex].
The magnitude of acceleration of the hockey puck is 190 m/s² .
Given data:
The mass of hockey puck is, m = 0.17 kg.
the magnitude of external force on the puck is, F = 35.0 N.
The magnitude of force of friction is, f = 2.7 N.
We need to find the net force acting on the puck first. For that consider the applied force in the x-direction. Then net force is,
F' = F - f
Solving as,
F' = 35.0 - 2.7
F' = 32.3 N
Now, use the Newton's Second law to obtain the magnitude of acceleration (a) as,
F' = ma
Solving as,
32.3 = 0.17 (a)
a = 32.3/0.17
a = 190 m/s²
Thus, we can conclude that the magnitude of acceleration of the hockey puck is 190 m/s² .
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Which of the following is not a property of electromagnetic waves?
Answer: It does not include alpha rays
Explanation: It does not include alpha rays
The specific heat capacity of water is 4,200 J/kg °C.
Calculate the thermal energy that must be
absorbed by 1.4 kg of water to increase its
temperature by 25 °C.
help TvT
When you must add three vectors together, what is not true this process? You must only give a magnitude of the resultant vector It does not matter what order you add the vectors You can move the vectors parallel to each other You must connect the head of each vector with the tail of the next vector
The addition of any numbers of vector provide the magnitude as well as the direction of the resultant vector, hence the mentioned first option is not true.
The addition of vector required to connect the head of the one vector with the tail of the other vector and any vector can be moved in the plane parallet to the previous location, so, the mentioned second and third options are true.
What is linear motion?
Answer:
Linear motion is a one-dimensional motion along a straight line, and can therefore be described mathematically using only one spatial dimension.
Explanation:
unlike other states of matter, what expand to fill their containers
Answer:
gas
Explanation:
Answer:
Person above me is big brain!
Explanation:
They are correct!
Give them some love and mark them as brainliest!
what does it mean mechanical advange is less than one?
Answer:
this happens when the input force is greater than the output force
HOPE IT HELPED YOU...
YO CAN YALL HELP ME IN DIS!
Answer:
i guess it will be mass or volume, but not sure
Explanation:
because the blocks volume will be same as the displaced water, then u will check the mass or volume of the water to see what the volume of a object will be.
what are contact force and non contact force give example
Explanation:
Force is push or pull on a body.
Contact force is a force that requires contact. It acts between two body that touches on another.
Examples are pushing a car, ringing a bell, kicking a ball.
Non contact forces are forces applied to another object without contact. The action of this force is usually through a targeted force field.
Examples are magnetic force, gravitational force
A bus travels at a constant speed of 40.0 m/s for .8h. Whats the total distance travelled in km.
Answer:
1,152 km. Hope this helps!
Explanation:
A climber of mass m slides down a vertical rope with an average acceleration a. What is the average frictional force exerted by the rope on the climber?
Answer:
m(g - a)
Explanation:
Since he slides with a mass 'm' and acceleration of "a", it means he is sliding in the position of gravity. Thus, Force = ma
Now, the force due to gravity = mg
The overall acceleration of the climber is downward along the rope. So "ma" is negative. Now, the only external forces acting on the person will be the force of gravity acting downward (W = mg) and the supporting Frictional Force F_f.
Thus, the net average frictional force of exerted by the rope on the climber will be;
mg - F_f - ma = 0
F_f = mg - ma
F_f = m(g - a)
Testing for which type of property could lead to damaging the mineral sample?
A. physical properties
B. chemical properties
C. hardness
D. color
Answer: B. Chemical Properties
Explanation:
You have finished running a marathon and you are relaxing and your body is
slowing down. What part of the autonomic nervous system is at work?
A. Sympathetic
B. Aphasic
C. Parasympathetic
D. Encoding
SUBMIT
A car travels from 20-meters to 60-meters in 10 seconds. Calculate the car's speed.
Answer:
8 m/s
Explanation:
All you have to do here is add 20 and 60 (giving you 80) and dividing by 10 seconds. 80/10= 8 m/s
is an atom with one valence electron more reactive than an atom with two electrone?
Answer:
An atom with a closed shell of valence electrons (corresponding to an electron configuration s2p6) tends to be chemically inert. An atom with one or two valence electrons more than a closed shell is highly reactive, because the extra valence electrons are easily removed to form a positive ion.Explanation:
Marion is on a train that travels 10 m/s and takes 2 seconds to slow to 5 m/s. How would you correctly calculate the acceleration?
Explanation:
t=2s
u=10
v=5
a=?
v=u+at
5=10+2a
2a=-5
a=-2.5
Explain the energy needed for a liquid to evaporate into gas
what is the weight of a 500 kg boulder on the moon?
Answer:
F = 810 [N]
Explanation:
To solve this problem we must use the acceleration of gravity of the moon, which according to information provided by the internet we can see that the gravitational acceleration corresponds to 1.62 [m/s^2].
The weight of a body corresponds to the product of mass by gravity, so with the following equation we can find the weight.
F =m*g
F = 500 * 1.62
F = 810 [N]
what is universe made off
Answer:
I mean, correct me if I'm wrong for some reason, but I think its Matter?
Answer:
The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.
Explanation:
1
Two beaker of water A and B , initially are at the same temperature.The temperature of the
water in beaker A is increased by 10F and the temperature of water in beaker B is increased
10 K. After these temperature change,which beaker of water has the higher temperature?
Answer :
beaker A , it is because the temperature increases is higher than beaker B.
Formula
(10°F − 32) × 5/9 + 273.15 = 260.928K
10 degrees fahrenheit = 260.928 kelvins
Formula
(10K − 273.15) × 9/5 + 32 = -441.7°F
10 kelvins = -441.67 degrees fahrenheit
beaker A , 10°F = -12.222 °C
beaker B , 10k = -263.15 °C
Beaker A of water will have a higher temperature than the temperature of beaker B.
How to change the temperature from Fahrenheit to Celcius?To convert the temperature Fahrenheit to Celsius formula is used from the scale Fahrenheit to Celsius. Both scales provide a way to measure the object’s hotness and coldness and are used to measure the temperature. The symbol used to express Fahrenheit is °F while the symbol used for Celsius is °C.
The formula used to change the temperature from Fahrenheit to Celsius as follows:
°C = (°F- 32)5/9
The temperature of beaker A is increased by 10°F. So the change in temperature in the Celcius scale is :
T(°C) = (10- 32)5/9
T(°C) = -12.22°C
The temperature of beaker B is increased by 10 K, then the temperature in Celcius is:
T(°C) = 10 - 273.15
T(°C) = - 263.15°C
Therefore, the temperature of beaker A will be higher after these changes if initially, both are at the same temperature.
Learn more about Fahrenheit and Celcius, here:
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