If a male runner in the fourth starting position ran the 400 m race in 44.40 s, then for calculating his average speed we have to divide the total distance covered by the time taken by him to cover the distance.
His average speed would be 9.0 meters/second.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.
The mathematical expression for speed is given by
speed = total distance /Total time
If a male runner in the fourth starting position completed the 400 m race in 44.40 s, we must divide the total distance traveled by the amount of time it took him to complete the course to get his average pace.
the average speed of the runner = 400 meters/44.40 seconds
= 9.0 meters/second
Thus, his average speed.be his average speed would be 9.0 meters per second
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Why is density such an important physical property?
Answer:
Density is important because it determines what substances floats and sinks.
Explanation:
an object is thrown with an initial speed v near the surface of earth. assume that air resistance is negligible and the gravitational field is constant. if the object is thrown vertically upward, the direction and magnitude of its acceleration while it is in the air is
Hi there!
a = -9.81 m/s²
When throwing a ball into the air (ignoring air resistance), the acceleration in the vertical direction is ALWAYS constant and equal to the acceleration due to gravity.
In this instance, the acceleration due to gravity is downward, resulting in the object falling. So, we must put a negative sign:
Thus, a = -9.81 m/s².
please helllllp shshsu
an electric car is being driven through a town at 22m/s the kinetic energy of the car is 222640 J calculate the mass of the car
The mass of the car at the given kinetic energy is 920 kg.
The given parameters;
initial velocity of the car, u = 22 m/skinetic energy of the car, K.E = 222,640 JKinetic energy if the energy acquired by a body during its motion. This kinetic energy is the product of average velocity squared and mass of the object.
The mass of the car at the given kinetic energy is calculated as follows;
[tex]K.E = \frac{1}{2} mv^2\\\\mv^2 = 2K.E \\\\m = \frac{2K.E}{v^2} \\\\m = \frac{2 \times 222,640}{(22)^2} \\\\m = 920 \ kg[/tex]
Thus, the mass of the car at the given kinetic energy is 920 kg.
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WILL MARK BRAINLIEST
A boy sledding down a hill accelerates at
1.29 m/s2
If he started from rest, in what distance
would he reach a speed of 6.87 m/s?
Answer in units of m.
Answer:
Explanation:
Explanation: In order for us to know how long it takes for the speed to be reached, we use the equation V= Vo + at, with V=6.87m/s, Vo= 0m/s since you start from rest and a=1.29m/s². T is the time in seconds that we want to find out.
6.87 = 0 + 1.29t
6.87 = 1.29t
t= 5.33s
Now, we want to know the distance this boy reaches in 5.33 seconds, in a 7m/s speed and accelarating in 1.29m/s². For finding this out, we use another equation, S = So + Vot + (at²)/2, S being the final distance, So = 0m because he started from rest, and the other variables used before.
S = 0 + 0*5 + [1.29*(5.33²)]/2
S = 0 + 0 + (1.29*28.40)/2
S = 36.64/2
S = 18.32m
Guys helppppp thanks so much
Answer:
4.9 or 49kj not sure hope it helps you
The average speed of a plane was 600 km/hr. How long did it take
the plane to travel 120 kilometers?
Answer:
0.2 hours
Explanation:
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged
thats epic my guy jsjsjdjdjd
Answer:
false I think
Explanation:
a ball is thrown upward at an angle what causes the change in the balls velocity?
Answer:
When a ball is thrown up in the air, the ball's velocity is initially upward. Since gravity pulls the object toward the earth with a constant acceleration g, the magnitude of velocity decreases as the ball approaches maximum height.
NEED HELP!!!! 11 POINTS!!!!!
Jose’s doctor recommends that he add more cardio to his exercise routine. Which exercise would be the BEST choice?
A.
ballet
B.
jogging
C.
bowling
D.
volleyball
PLEASE NO LINKS
Answer:
B, jogging
Explanation:
i guess because it makes you sweat
Answer:
jogging
Explanation:
run at a steady gentle pace, especially on a regular basis as a form of physical exercise.
where does the largest input of solar energy occur?
Answer:
the earth
Explanation:
The largest input of solar energy strikes the Earth at the equator.
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COLUMN A
1. _______ A
2.________B
3.________C
4________ D
5.________E
COLUMN B
A. brushes
B. Magnets
C. Battery terminals
D. Commutator
E. Armature
the sound _____ of these vibrations passes along the string
Answer:
This results in a wave of vibrations travelling through the air to the ... such as the medium it travels through and the strength of the initial vibration
Explanation:
Answer:
The sound waves of these vibrations passes along the string.
A boy is watching his grandfather fire an old cannon. He notices that whenever the
cannonball is fired, it moves with a very high velocity to the right. He also notices
that when the cannonball is fired, the cannon moves very slowly to the left. How
does conservation of momentum explain these observations?
v cannon
V cannonball
Since the motions of the cannon and cannon ball were caused by the same
event, they must have equal and opposite momentum. Since the cannon has
much more mass, it will have a larger velocity.
The total momentum of the system was zero before the cannon was fired, so
the cannonball and cannon must have equal and opposite momentum. Since
the cannon has much more mass, it will have a smaller velocity.
The cannon gave momentum to the cannon ball, so they both begin to move.
Since the cannon has much more mass, it will have a smaller momentum.
The cannon gave momentum to the cannon ball, so they both begin to move.
Since the cannonball has much less mass, it will have a smaller momentum.
Answer:
since the cannon ball has much less mass it will have a smaller momentum.
The system's total momentum was zero before the cannon was fired, the momentum of the cannonball and the cannon must be equal and opposing. Since the cannon has much more mass, it will have a smaller velocity.
What is momentum?The combination of a particle's mass and velocity produces momentum. Momentum has both a direction. The force exerted on a particle is equated to the time rate of change of momentum by Isaac Newton's second equation of motion.
Since there is no external force acting on the system, momentum ought to be conserved in accordance with the law of conservation of momentum.
Since we are aware that momentum is determined by a formula
M = [tex]mass * velocity[/tex]
Here M is the momentum.
Since the system's total momentum was zero before the cannon was fired, the momentum of the cannonball and the cannon must be equal and opposing. The cannon will have a lower velocity because it has a lot greater mass.
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I need some help
a golfer can hit a golf ball 300 m horizontally. what maximum height would a 301.5 meter drive reach if it was launched at a 25 degree angle above the ground
This question involves the concepts of projectile motion, horizontal range, and height.
The maximum height reached by the ball is "35.15 m".
First, we will find out the launch velocity of the projectile motion of the ball, by using the formula of the horizontal range:
[tex]R= \frac{u^2Sin\ 2\theta}{g}\\\\[/tex]
where,
R = horizontal range = 301.5 m
u = launch speed = ?
θ = launch angle = 25°
g = acceleration due to gravity = 9.81 m/s²
Therefore,
[tex]301.5\ m = \frac{u^2Sin\ 50^o}{9.81\ m/s^2}\\\\u = \sqrt{\frac{(301.5\ m)(9.81\ m/s^2)}{Sin\ 50^o}}[/tex]
u = 62.14 m/s
Now, we will find out the maximum height (H) of the projectile motion, using the following formula:
[tex]H = \frac{u^2Sin^2\theta}{2g}\\\\H =\frac{(62.14\ m/s)^2Sin^2(25^o)}{2(9.81\ m/s^2)}[/tex]
H = 35.15 m
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The attached picture shows the projectile motion.
A block is dragged along the following surfaces. Which would result in the greatest kinetic friction force?
highly polished table
rough table
sandpaper
The kinetic force would be equal for all surfaces.
Answer:b
Explanation:
The greatest kinetic friction force occurs when the block is dragged along Sand paper
Kinetic friction is defined as the force of friction that exists between two surfaces in contact as one surface moves over the other.
Many factors affects the magnitude of frictional force and prominent among those factors is the nature of a surface. Rough surface cause a greater frictional force than smooth and highly polished surfaces or smooth surfaces.
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1. How does the mass of Jupiter compare to Earth?
2. How quickly does it rotate on its axis?
3. What makes the different bands on the planet?
Answer:
1.
Jupiter is the largest planet in the solar system. (Image credit: NASA)
The largest planet in the solar system, the gas giant Jupiter is approximately 318 times as massive as Earth. If the mass of all of the other planets in the solar system were combined into one "super planet," Jupiter would still be two and a half times as large.
2.Rotation of Jupiter
[/caption]
Jupiter has the fastest rotation of all the planets in the Solar System, completing one rotation on its axis every 9.9 hours.
3.Jupiter, the King of the Planets, is a gas giant, which means that it's made mostly of gases like hydrogen and helium, and that it doesn't have a solid surface in the way that rocky planets like Earth do. With a temperature of 130 K (-140 C, -230 F), it's so cold that it gives off most of its energy in the infrared. In fact, Jupiter gives off almost twice as much heat as it receives from the Sun. It's able to do this because it has its own internal heat source, powered by the slow gravitational collapse that started when the planet first formed. Astronomers estimate that Jupiter is currently shrinking by almost 2 cm per year
answer asap!!
---------------
Answer:
conduction
Explanation:
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what is the purpose of the magnetic field in a cathode ray tube?
Answer:
In order to determine if the cathode ray consisted of charged particles, Thomson used magnets and charged plates to deflect the cathode ray. He observed that cathode rays were deflected by a magnetic field in the same manner as a wire carrying an electric current, which was known to be negatively charged.
Explanation:
According to the right-hand rule, the magnetic field causes the electrons to be refracted. Turn on the power strip to learn about the Cathode Ray (electron beam) Deflection by an Electric Field.
What is Magnetic Field?Magnetic forces can be seen in a magnetic field, an electric current, a changing electric field, or a vector field around a magnet. Magnetic compass needles and other permanent magnets align in the direction of magnetic fields like the one found on Earth. Electrically charged particles are forced to move in a circular or helical pattern by magnetic fields. The operation of electric motors is caused by this force, which is applied to electric currents in wires in a magnetic field.
The Lorentz Force, which is explained by the left-hand rule, has an impact on what happens inside the tube. In accordance with this law, an electron or other charged particle travelling in a magnetic field will be deflected by the field at a right angle to both the field's direction and the direction of the particle.
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An object is pulled up an incline plane at a constant velocity as the picture above shows. Calculate the tension on the rope.
A. 377 N
B. 502 N
C. 305 N
D. 545 N
Hi there!
[tex]\large\boxed{545N}[/tex]
Since the object is being pulled at a constant velocity, the forces must be balanced.
Since there is no movement vertically, we must take into account the horizontal forces. We can also assume a positive acceleration to be in the direction of motion.
The acceleration and force due to gravity on an incline is:
a = gsinФ
F = MgsinФ
∑F = -MgsinФ + T
Since it is getting pulled at a constant velocity, ∑F = 0. So:
0 = -MgsinФ + T
MgsinФ = T
Solve for T by plugging in values. Let g = 10 m/s²
T = (120)(10)sin(27) ≈ 545 N
when we drink coke it's black in colour but why don't our urine becomes black?
Answer:
Because it filters
Explanation:
it filters out the urine, and changes it into nutrients I'm pretty sure
answer asap asap!
-----------------
Answer:
Neutral
Explanation:
A neutral atom has an equal number of protons and electrons so that the positive and negative charges exactly balance. Since it is the electrons that determine how one atom interacts with another, in the end it is the number of protons in the nucleus that determines the chemical properties of an atom.
plss help plss i need it now
Answer:
anong grade po. yan? seven po ba yanA girl runs at an average speed of 6 m/s for 12 s. How far does she go in 12 s?
Explanation:
Distance= speed × time
= 6 × 12 m
= 72 m
Tính lực tương tác giữa 2 điện tích q1=4.10^-6C và q2=-3.10^-6C cách nhau một 3cm đặt trong dầu hoả = 2
Explanation:
decimal diamond ml dias and ka n t u t a n mo papa mo
Where are protons and neutrons found in an atom
Answer:
The Nucleus
Explanation:
Protons and Neutrons are found in the nucleus of an atom.
Answer:
Nucleus
Explanation:
A car traveling at 30 m/s speeds up to 35 m/s over a period of 5 seconds. What is the acceleration of the car?
Answer:
u =30 m/s
v = 35 m/s
t = 5 secs
Explanation:
a = (v- u)/t
a = (35-30)/5
a = 5/5
a = 1 m/s^2
PLS MARK BRAINLIEST
on the vertical projection what is the difference between a protected up and down?
Explanation:
projected up means you are on the ground throwing a projectile
projected down mean you are on a high place like a cliff or mountain
How does resistance affect the flow of current in a connecting wire?
Answer:
Resistance affect the flow of current in a connecting wire because there is a direct relationship between the amount of resistance encountered by charge and the length of wire it must traverse. Second, the cross-sectional area of the wires will affect the amount of resistance. Wider wires have a greater cross-sectional area.
The velocity of a bus increases from 27km/h to 30m/s in . Calculate its acceleration.
Answer:
No time interval???
Explanation:
convert from km/h to m/s (speed)
27×1000/3600
27000/3600
=7.5m/s
a= v-u/t
v(final velocity) is 30m/s, u(initial velocity) is 7.5m/sa= 30-7.5/t
a= 22.5/t (m/s²)