Sound travels the fastest through steel. So, option (A) is correct,
What are the effects of medium in speeds of sound ?Depending on the medium that it is moving through, sound has a wide range of speeds. The stiffness of the medium (or compressibility in the case of gases) and its density work together to define the speed of sound in that medium. The speed of sound increases with the rigidity (or lack of compressibility) of the medium. The speed of sound decreases with increasing medium density.
Due to air's ability to be compressed, the speed of sound in air is low. The speed of sound is often higher in liquids and solids than in gases because they are more rigid and difficult to compress than gases. Given that temperature impacts density, the speed of sound is somewhat correlated with the temperature of the material it is travelling through, particularly for gases.
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Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately .60 m) 10 times in one minute; Ben lifts the 50 kg barbell the same distance over his head 10 times in 10 seconds. Which student does the most work? Which student delivers the most power? Explain your answers.
Answer:
Both of them
Explanation:
Calculate the average speed of a runner who runs to for 500 meters in 40 second
Answer:
12.5
Explanation:
A 2000 kg car is moving at 1.5 m/s. What is its kinetic energy?*
A. 0J
B. 3000J
C. 1500 J
D. 4500 J
E. 2250 J
You want to push a 71-kg box up a 16° ramp. The coefficient of kinetic friction between the ramp and the box is 0.23. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed?
Answer:
345.60N
Explanation:
The magnitude of the force parallel to the ramp that will push the box up the ramp are the frictional force(Ff) and the moving force Fm
Total force = Ff + Fm
Ff = ηR
Ff = ηmgcosθ
Fm = Wsinθ
Fm = mgsinθ
Total force = ηmgcosθ + mgsinθ
Total force = mg(ηcosθ + sinθ)
Given
mass m = 71kg
acceleration due to gravity g = 9.8m/s²
angle of inclination θ = 16°
coefficient of friction η = 0.23
Substitute into the formula;
Total force = 71(9.8)(0.23cos16 + sin16)
Total force = 695.8(0.2211+0.2756)
Total force = 695.8(0.4967)
Total force = 345.60N
Hence the magnitude force parallel to the ramp that you should push on the box so that it moves up the ramp at a constant speed is 345.60N
Chemical reactions occur due to sharing or transferring of blank. Please help ASAP!!!!
Answer: valence electrons?
Explanation:
The density of an object is dependent upon the object’s mass and ---
Answer:Volume
Explanation:
Density = mass/ Volume
Answer:
Volume
Explanation:
A 50 Kg football player is standing still when he experiences an inelastic collision with a 150 Kg football player who is traveling at 10 m/s. What is the velocity of the player immediately after the collision?
Answer:
V = 7.5 m/s
Explanation:
Given that,
Mass of player 1, m₁ = 50 kg
Mass of player 2, m₂ = 150 kg
50 kg player stands still and 150 kg player is traveling at 10 m/s
We need to find the velocity of the player immediately after the collision. As the inelastic collision occurs. The linear momentum will remain conserved. After the collision, let they move with a constant velocity say V.So,
[tex]m_1u_1+m_2u_2=(m_1+m_2)V\\\\V=\dfrac{m_1u_1+m_2u_2}{(m_1+m_2)}\\\\=\dfrac{150\times 10}{(50+150)}\\\\=7.5\ m/s[/tex]
So, the velocity of the player immediately after the collision is 7.5 m/s.
An outfielder throws a baseball to the second baseman at a speed of 19.6 m/s and and angle of 60 degrees above the horizontal. If the ball is caught at the same height from which it was thrown, calculate the amount of time the ball was in the air
A jet aircraft is traveling at 262 m/s in hor-
izontal flight. The engine takes in air at a
rate of 85.9 kg/s and burns fuel at a rate of
3.92 kg/s. The exhaust gases are ejected at
921 m/s relative to the aircraft.
Find the thrust of the jet engine.
Solution :
Speed of the air craft, [tex]$S_a$[/tex] = 262 m/s
Fuel burns at the rate of, [tex]$S_b$[/tex] = 3.92 kg/s
Rate at which the engine takes in air, [tex]$S_{air}$[/tex] = 85.9 kg/s
Speed of the exhaust gas that are ejected relative to the aircraft, [tex]$S_{exh}$[/tex] =921 m/s
Therefore, the upward thrust of the jet engine is given by
[tex]$F=S_{air}(S_{exh}-S_a)+(S_b \times S_{exh})$[/tex]
F = 85.9(921 - 262) + (3.92 x 921)
= 4862635.79 + 3610.32
= [tex]$4.8 \times 10^6 \ N$[/tex]
Therefore thrust of the jet engine is [tex]$4.8 \times 10^6 \ N$[/tex].
What 2 factors affect the impulse on an object in a collision?
An electric energy distributor supplies each household 220
volts of voltage and 60 A of current. Applying your knowledge on Ohm's Law, in what way your appliances be used at home to maintain a safe amount of current?
Answer:
Hence appliance but be connected to a 3.67 ohms load to maintain a safe amount of the current
Explanation:
According to Ohm's law, V = IR
V is the potential difference = 220volts
I is the current = 60 A
R is the resistance (Load)
Calculating the load R
R = V/I
R = 220/60
R = 3.67 ohms
Hence appliance but be connected to a 3.67 ohms load to maintain a safe amount of the current
A _______________ is a diagram that shows the relationship of one variable to another.
Answer:
A _______________ is a diagram that shows the relationship of one variable to another.
Explanation:
what is Newton's second law it's challenging question
let's observ who is answering first
Answer:
second law is f=ma (force=massxacceleration)
Explanation:
Sharon is driving on a straight road. She is driving north, and her speed is
decreasing. If north is the positive direction, which of the following
statements is accurate?
A) Her velocity is positive, and her acceleration is negative.
B) Her velocity is negative, and
her acceleration is negative.
C) Her velocity is negative, and her acceleration is positive.
D) Her velocity is positive, and her acceleration is positive.
Plzz help
Answer:
b
Explanation:
b is the correct answer
Answer:
b. Her velocity is positive, and her acceleration is negative.
Explanation:
Atoms of two different elements must have different
A. Electrical charges
B. Number of neutrons
C. Atomic numbers
D. Energy levels
Explanation:
C. Atomic numbers....
Answer:
atomic numbers
Explanation:
In order for two atoms to be different, they have to have a different number of protons. Protons are represented by the atomic number. Thus, atoms of two DIFFERENT elements must have different atomic numbers.
I took the test and got 100%
Hope this helps!
An object in motion will remain in motion and an object at rest will remain at rest until a greater force interrupts it. Explain this concept.
Answer:
A object, lets say a cup. This cup will never, ever move unless something or someone disturbs it. If something touches or hits this cup the cup will move. But, until the cup gets touched, nothing will EVER make it move.
Explanation:
I hope this helps!!
The temp of the metal in a running car engine is 388 K. Find this temp in Celsius.
Answer:
115°c
Explanation:
°c=k-273
388-273=115
30 POINTS!!!! If you increase the frequency, what happens to the velocity of the wave?
In answering this question, describe how you determined the velocity as well as the result you arrived at. Then, provide a scientific explanation for this result, based on your knowledge of waves.
Answer:
As frequency increases, wavelength decreases. Frequency and wavelength are inversely proportional. This basically means that when the wavelength is increased, the frequency decreases and vice versa.
Explanation:
A wave's velocity is independent of its intensity and equal to the product of its wavelength and frequency (number of vibrations per second) so, velocity remains constant if you increase the frequency.
What is Frequency?Frequency is defined as the no of waves that are passing from the point in respect to a given time. Frequency can be measured in Hertz. Humans, whose capacity to hear is normal, can hear between the frequency of 20 Hertz to 20000 Hertz.
In mathematical form, the frequency is the factor of one divided by the time period. The number of cycles or vibrations a body in periodic motion makes in one unit of time.
Wavelength reduces as frequency rises. The relationship between frequency and wavelength is inverse. In essence, this means that the frequency reduces as the wavelength increases and vice versa.
Frequency ∝ 1 / Wavelength
Velocity = Frequency × Wavelength
Thus, it remains constant.
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A mover uses a pulley to lift a 2500N piano up to a second story balcony. The mover pauses to wipe sweat from his forehead while holding the rope tight in one hand. Since the piano is not moving at this time, what is the tension force in the rope while the piano is dangling still in the air?
Answer:
2500 N
Explanation:
Tension force may be defined as the force which is transmitted along a cable, rope, or through a string which is stretchable and is puled tight by the forces acting from the opposite sides. It is directed along the length of the string or the rope.
In the context, a pulley string holds a 2500 N piano that is used to lift it to second story balcony. When the piano is held stationary by the mover, the tension force acting on the rope is the weight force or the gravitational force that acts on the piano which is 2500 N. The tension force balances the the weight force of the piano when it is not moving.
Bob can run the 100 meter dash in 25 seconds. What is his speed?
Answer:
4 meters a second
Explanation:
100/25
plzz mark brainiest
2. The purpose of using ice on an injured area is... *
to increase blood flow.
O to hydrate an injury.
O to reduce blood flow.
O to dilate blood vessels.
Kayla is measuring how long it takes a ball to roll down a hill. The ball has a
starting velocity of 2.6 m/s. The ball rolls down the hill for 5.5 seconds, and
when it reaches the bottom, it has a velocity of 8.0 m/s. How far did the ball
roll during this time frame?
A) 44 meters
B) 14 meters
C) 29 meters
D) 58 meters
What makes the yardstick test a direct measurement of reaction time?
A.
The further the yardstick falls, the slower the reaction time.
B.
Yardsticks have numerical markings for length.
C.
Yardsticks are designed to measure reaction time.
D.
all of the above
Please select the best answer from the choices provided.
A
B
C
D
Answer:
A. the further the yardsticks falls, the slower the reaction time.
Answer:
The further the yardstick falls, the slower the reaction time.
Explanation:
its A
Can someone help please I will give brainliest
Who believe in astrology?
it takes 5100 N of force to accelerate a ford mustang 3 m/s2 what is the mass of the car
Answer:
1700 kg
Explanation:
The mass of the ford mustang car be 1700 kg.
What is mass?In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force.
The change caused by an applied force is smaller the more mass a body has. The kilograms serves as the unit of mass in the International System of Units (SI).
Given parameters:
Force applied on the ford mustang car: F = 5100 N.
Acceleration of the ford mustang car: a = 3 m/s^2.
So, The mass of the ford mustang car be = force/acceleration
= 5100/3 kg.
= 1700 kg.
Hence, the mass of the ford mustang car be 1700 kg.
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This equation goes with which law?
Answer:
I think that's Newton's second law of motion
Explanation:
f = m(v-u)
________
t
since a = (v-u)t
f = ma
A cannonball with a perfect horizontal velocity of 50.0 m/s flies 350 m before hitting the
ground. How much time was the cannonball in the air? Remember t d/v
05s
O 10s
35 s
7s
Answer:
7 sExplanation:
The time taken can be found by using the formula
[tex]t = \frac{d}{v} \\ [/tex]
d is the distance
v is the velocity
From the question we have
[tex]t = \frac{350}{50} = \frac{35}{5} = 7 \\ [/tex]
We have the final answer as
7 sHope this helps you
A jet aircraft is traveling at 214 m/s in hor-
izontal flight. The engine takes in air at a
rate of 115 kg/s and burns fuel at a rate of
2.53 kg/s. The exhaust gases are ejected at
276 m/s relative to the aircraft.
Find the thrust of the jet engine.
Answer in units of N.
Answer:
The thrust is [tex]F = 7828.3 \ N [/tex]
Explanation:
From the question we are told that
The speed of the jet aircraft is [tex]v = 214 \ m/s[/tex]
The rate at which the engine takes in air is [tex]\^ Q = 115 \ kg/s[/tex]
The rate at which the engine burns fuel is [tex]\r m = 2.53 \ kg/s[/tex]
The speed of the exhaust gases is [tex]u = 276 \ m/s[/tex]
Generally the thrust of the engine is mathematically represented as
[tex]F =[ \^ Q * ( u - v )] + (\r m * u)[/tex]
=> [tex]F =[ 115 * ( 276 - 214 )] + (2.53 * 276)[/tex]
=> [tex]F = 7828.3 \ N [/tex]
how to calculate the average value of the indirect measurements of KE
Answer:
1/2 m*(2(h)/t)*g
Explanation:
Kinetic energy refers to the form of energy that's used by an object due to its motion.
You didn't give more information about the values, therefore, the kinetic energy will be explained. It should be noted that when work, which helps in the transfer of energy is done on an object, the object will speed up and thereby gain kinetic energy.
Kinetic energy simply refers to the property of a moving object or a particle. It depends on both motion and mass. The formula for the calculation of kinetic energy is given as:= 1/2mv²
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