KE = 1/2 mv²
v = 10 km/h = 2.78 m/s
v = 20 km/h = 5.56 m/s
10 = 1/2 m . 2.78²
m = 2.59 kg
KE = 1/2 x 2.59 x 5.56²
KE = 40.03 J
The average speed of sound in ocean water is 1510 m/s. If a sound travels
with a wavelength of 20 m, what is its frequency?*
0. 01 Hz
75. 5 Hz
30. 2 MHz
30,200 Hz
Answer:
75. 5 Hz
Explanation:
velocity = frequency × wave length
1510 = frequency × 20
frequency = 1510÷20 = 75.5 Hz
can you mark my answer brainliest please ♥️...
Science | Heat
Analyze the given examples, then, write C if it is convection and NC if it is not.
I'd appreciate the help :))!
The examples of heat transfer by convection are the air being heated in a hot-air balloon, Sea breeze and land, Air conditioner and Hot airflow in summer.
What is heat transfer by convection?
Heat transfer by convection is the heat flow from one place to another due to the movement of fluid.
Examples of heat transfer by convection include the followings;
The air being heated in a hot-air balloon: the heated hot air rises while cold surrounding air which is high dense falls beneath the hot air.Sea breeze and land: the cold sea breeze replacing hot air from the land during day or the land breeze cooling the sea at night.Air conditioner: the cold air replacing the hot airHot airflow in summer: the movement of the cold towards the pole and the displacement of the hot air.Learn more about heat transfer by convection here: https://brainly.com/question/12072129
HELP!!!
Why is it important for governments
to invest in new technologies to
provide energy??
energy security and affordability, the potential for job creation, future economic strategic positioning, and addressing environmental and other externalities.
help pls pls pls pls pls
The weight in any case is the mass times the acceleration due to gravity.
So;
[tex]Weight = 65.0kg * 1.62m/s^2=105.3N[/tex]
Hope that helps!
HEYY! Please help!
Turn this Algebraic expression into a Verbal expression!
2(3j+5+8j)
Thank you! <33
Answer:
22J+10
Explanation:
that is it in verbal expression
help.
Help help help help
Answer:
B. 1.750 x 10^3
Explanation:
1/2 * 35 * 10^2
A basketball player uses a bat to hit a 0.145- kilogram stationary baseball with a force of 18,436 Newton's. What is the force, in Newton's, on the player's bat?
A. 2,673 newtons
B. 9,218 newtons
C. 18, 436 newtons
D. 36, 872 newtons
Answer: C
Explanation:
Newton's Third Law of motion states that any action causes an equal and opposite reaction. This is the fundamental requirement for the conservation of classical momentum.
The force, in Newton's, on the player's bat is 18, 436 newtons. The correct option is C.
What is force?The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate. A force is not something an object "has in it" or that it "contains." One thing experiences a force from another. There are both living things and non-living objects in the concept of a force.
Although modest, the gravitational force has a relatively wide field of effect. Maturity is always appealing. Since mass is its source, it operates between any two particles of matter in the universe.
Every action results in a corresponding and opposing response, according to Newton's Third Law of Motion. The basic prerequisite for the conservation of classical momentum is this.
Therefore, the correct option is C. 18, 436 newtons.
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What do all scientific areas of study have in common?
Answer:
They examine theories in a systematic manner.
Explanation:
How does the interference of sound waves make sounds louder of softer?
Answer:
Explanation:
Lower pitch Normal pitch Sound Interference If you walk through a room with stereo speakers at each end, the sound might seem louder in some places and softer in others. The waves from each speaker interact with one another. Interference occurs when waves that overlap combine, forming a new wave.
If a 3 kg block rests on a rough horizontal table and experienced a 2 N force of static friction then what is the coefficient of static friction between the block and the table
The coefficient of static friction of the block is 0.068.
What is static friction?This is the force between two bodies in contact and tends to oppose their motion. It is also the force that keeps two bodies at rest
To calculate the coefficient of static friction, we use the formula below.
Formula:
F = mgμ............. Equation 1Where:
F = Horizontal forcem = mass of the blockg = acceleration due to gravityμ = coefficient of static friction.Make μ the subject of the equation
μ = F/mg.............. Equation 2From the question,
Given:
m = 3 kgg = 9.8 m/s²F = 2 NSubstitute these values into equation 2
μ = 2/(3×9.8)μ = 2/29.4μ = 0.068.Hence, The coefficient of static friction of the block is 0.068.
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please help me on answer
Answer:
The slope is 0.5
Explanation:
It increases so it is positive and it increases by half a block each time so 0.5.
Have an amazing day!
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A 23.3 kg crate is pushed with a force of 944 N for 36.0 seconds, moving the crate a distance of 12.4 m. How much power was used
Explanation:
[tex]p = \frac{f \times s}{t} [/tex]
power = Force × distance /time
power = 944N × 12.4m/36secs
power = (944×12.4/36)Nms—¹
power = 390.2Nms—¹ or 390.2Watts or 390.2Js—¹
Greyhounds are among the fastest dogs on earth. On average, what is the fastest speed they can run?.
19 yds is the same as how many meters
How long does it take an airplane, accelerating from rest at 5.00 m/s2, to travel 360 m?
If a scrapped car has a mass of 1,500 kg, what is the mass of the materials that can be recovered using a magnet?
The mass of the materials that can be recovered using a magnet is 1500 kg.
Law of conservation of matter
The law of conservation of matter states that matter can neither be created nor destroyed but can be converted from one form to another.
Based on this law of conservation of mass or matter, the mass of the scrapped car will remain constant and can neither change nor destroyed.
mass of scrapped car = mass of car recovered
Thus, the mass of the materials that can be recovered using a magnet is 1500 kg.
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A 17,250 kg rocket is pushed with a thrust of 7236904 N. What is the acceleration of the rocket?.
The acceleration of the rocket of mass 17250 kg when pushed with a thrust of 7236904 N is 409.73 m/s².
What is acceleration?Acceleration can be defined as the rate of change of velocity
To calculate the acceleration of the rocket, we use the formula below, And this formula is obtained from newton's second law of motion.
Formula:
ma = T-mg.............. Equation 1Where:
m = mass of the rocketa = acceleration of the rocketT = Thrust on the rocketg = acceleration due to gravity of the rocket.Make a the subject of the equation
a = (T-mg)/m............. Equation 2From the question,
Given:
T = 7236904 Nm = 17250 kgg = 9.8 m/s²Substitute these values into equation 2
a = [7236904-(17250×9.8)]/17250a = (7236904-169050)/17250a = 7067854/17250a = 409.73 m/s²Hence, The acceleration of the rocket is 409.73 m/s².
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Coulomb’s law is stated mathematically as
F
=
k
q
1
q
2
r
2
where F represents electrical force, k is the electrostatic constant, q represents strength of an electrical charge and r represents the distance between the centers of the charges.
• Explain the relationship between force and strength of electrical charge and the relationship between force and distance, based on this equation.
• Determine how doubling the strength of both charges at the same time affects the force between them.
Relationship between force and strength of electrical charge directly proportional whereas the relationship between force and distance is inversely proportional
Relationship between force, charges and distanceThe relationship between force and strength of electrical charge directly proportional to each other which means if one increases the other will automatically increases whereas the relationship between force and distance is inversely proportional which means that if one increases the other will decrease.
Doubling the strength of both charges at the same time affects the force between them because both charges are directly proportional to its force so we can conclude that relationship between force and strength of electrical charge directly proportional whereas the relationship between force and distance is inversely proportional.
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2.70 ft is the same as how many cm
Answer:
82.296cm
Explanation:
2.7 * 30.48cm/1ft= 82.296cm
A 0. 5 kg arrow was shot at a target. The arrow accelerated at 200 m/s2. What was
the net force on the arrow to the nearest newton?
Answer:
100 newtons
Explanation:
F= ma
what is the effect of altitude on atmospheric pressure
Answer:
Pressure decreases with increasing altitude.
Explanation:
The atmospheric pressure is maximum on the surface of the earth. When we go to high altitude then the atmospheric pressure decreases .At high altitude the atmospheric pressure becomes much less than our blood pressure.
You've got a flat tire. To lift your car, you make a homemade lever (see the figure (Figure 1)). A very light 1.6-m-long handle part is pushed down on the right side of the fulcrum and a 0.050-m-long part on the left side supports the back of the car.
How hard must you push down on the handle so that the lever exerts an 6900- N force to lift the back of the car?
How hard you must push down on the handle is by applying a force of 215.63 N
Moment of a forceThe moment of a force about a point is the turning effect of the force about that point.
The moment of a force M = Fd where
F = force and d = perpendicular distance of force from pivot point.Now, for you to lift up the car, the moment due to your force about the fulcrum, M equals the moment due to the force on back of car. M'
M = M'
FD = F'd where
F = Force applied, D = distance of force from fulcrum = 1.6 m, F' = force applied on back of car = 6900 N and d = distance of force on back of car from fulcrum = 0.050 mMaking F subject of the formula,we have
F = F'd/D
Substituting the values of the variables into the equation,we have
F = F'd/D
F = 6900 N × 0.050 m/1.6 m
F = 345 Nm/1.6 m
F = 215.625 N
F ≅ 215.63 N
So, how hard you must push down on the handle is by applying a force of 215.63 N
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How long was a 50 W lightbulb left on for if 500,002 J were burned?
" 50 W " means " 50 Watts " or " 50 Joules per second ".
(500,002 J) / (50 J/sec) = 10,000.04 seconds
(That's 2 hours 46 minutes 40.04 seconds.)
What happens to the speed of a sound wave as it passes from the air into the ground?
Answer:
SEE BELOW
Explanation:
Sound travels faster in warmer air, so the sound waves are refracted upward, away from the ground. Various atmospheric conditions can cause a temperature inversion, with air temperature increasing with height. This causes some of the sound energy from a source near the ground to be refracted back toward the ground.
pleaseeee help me please t
Answer:
The current will remain unchanged:
If the switches are open then 18 Ω is in parallel with 18 Ω
This gives an equivalent resistance of 9 Ω for the circuit
R = R1 R2 / (R1 + R2) = (18 * 18)/ 36 = 9 Ω
Now suppose that switches are closed, then
each parallel combination of 6 Ω is in series with the other two
One combination = (6 * 6) / (6 + 6) = 3 Ω
There will be 3 of these parallel combinations in series providing a total resistance of 9 Ω which is the same as before so i is unchanged
A plane makes a complete circle with a radius of
3622 m in 2.10 min. What is the speed of the plane?
Answer:
10
Explanation:
Which type of energy is stored in chemical compounds and released in chemical reactions?
potential
kinetic
chemical
electrical
Answer:
Potential, tell me if that's wrong, and sorry if its wrong.
Explanation:
Think of an animal that has a distinctive or unusual body shapes. Describe how its body shape helps its momentum and how momentum affects its survival.
penguins! so momentum is based on mass and velocity, the advantages is that they have stored mass in the form of like fats to keep them warm however they are built to slide basically so that there is less friction when they travel so sideways their bullet like shape helps increase velocity so they have both mass and considerable velocity!
A convex, or converging, lens with a focal length of 34 cm is used to observe an image of an apple than is 80 cm away from the lens. At what distance from the lens does the image form and what type of image is it?.
The image distance is 59.2 cm and the image is real and small.
Image distanceThe distance of the image formed by the convex or converging lens is determined by applying the following lens equation.
1/f = 1/u + 1/v
where;
f is the focal length = 34 cmu is the object distance = 80 cmv is the image distance = ?1/v = 1/f - 1/u
1/v = 1/34 - 1/80
1/v = 0.0294 - 0.0125
1/v = 0.0169
v = 1/0.0169
v = 59.2 cm
Thus, the image distance is 59.2 cm and the image is real and small.
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Calculate the potential difference required across a conductor of resistance 5 ohm to pass a current of
1.5 A through it .
Answer:
7.5 volts
Explanation:
V= IR
V= 1.5×5
V= 7.5 volts