An athlete runs some distance before taking a long jump. Why ?
Answers
An athlete runs before taking a long jump because they need to gather the strength to jump its like a person brain storming before they write an essay
Related Questions
How does the electromagnetic energy from the sun hitting Earth’s surface affect the climate of an area? Which one?
Answers
Answer:
The absorbed sunlight drives photosynthesis, fuels evaporation, melts snow and ice, and warms the Earth system.
Explanation:
And there you go! :)
7. is gravity force an attractive or repulsive force? is gravity force a weaker force or stronger force (in terms of its strength)?
Answers
Gravity is an attractive force, meaning that it pulls objects towards each other. It is considered a relatively weak force compared to other forces in the universe, but its strength is proportional to the mass of the objects involved and the distance between them. Over large distances and for massive objects, gravity can be a very strong force.
What causes the attractive force of gravity?The attractive force of gravity is caused by the masses of objects and the distance between them. According to Newton's law of universal gravitation, the strength of the gravity force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. The greater the masses of the objects and the closer they are to each other, the stronger the attractive force of gravity will be between them. This fundamental principle helps to explain why objects are pulled towards each other, creating the attractive force of gravity.
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analysis of a bus crashgiven the following theoretical data for the collision, answer the following questions and complete the data table. show work! bus suv m v p m v p total momentum before collision 1600 kg 10 m/s 600 kg 0 after collision 1600 kg 3 m/s 600 kg 1. what is the change in momentum of the bus?
Answers
The change in the momentum of the bus is 10600 kg-m/s, if bus of 1600 kg crashes with a SUV of 600 kg.
The mass of the bus, m₁ = 1600 kg
The mass of the SUV, m₂ = 600 kg
Initial velocity of the bus, v₁ = 10 m/s
initial velocity of the SUV, v₂ = 0 (at rest)
Velocity of the bus after collision, v₃ = 3 m/s
Velocity of the SUV after collision, v₄ = 1 m/s
The change in momentum(Δp) is given by,
Δp = (m₁v₁ + m₂v₂) - (m₁v₃ + m₂v₄)
Δp = (1600 × 10 + 600 × 0) - (1600 × 3 + 600 × 1)
Δp = 16000 - 5400
Δp = 10600 kg-m/s
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select the planetary properties which we can measure with current doppler method.
-eccentricity of orbit
-semimajor axis of orbit
-lower limit mass
-orbital period
Answers
The Doppler method can measure the eccentricity of orbit, semimajor axis of orbit, lower limit mass, and orbital period of exoplanets.
Eccentricity of orbit: The Doppler method can provide information about the eccentricity of a planet's orbit by detecting the periodic variations in the star's radial velocity caused by the planet's gravitational pull.
Semimajor axis of orbit: The Doppler method allows for the determination of the semimajor axis of a planet's orbit. By measuring the periodic changes in the star's radial velocity, scientists can infer the distance between the star and the planet, which corresponds to the semimajor axis.
Lower limit mass: The Doppler method can provide a lower limit estimate of a planet's mass. By observing the periodic variations in the star's radial velocity, scientists can calculate the minimum mass of the planet based on the gravitational influence it exerts on the star.
Orbital period: The Doppler method is particularly effective in determining the orbital period of a planet. By measuring the time it takes for the periodic changes in the star's radial velocity to repeat, scientists can accurately determine the planet's orbital period.
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A suspended pith ball possessing +10°c of charge is placed
0.02 m away from a metal plate possessing -64c of charge.
what is the force on the negatively charged object?
Answers
The force on the negatively charged object is approximately -1.44 N. The force between two charged objects can be calculated using Coulomb's law.
Coulomb's law states that the force (F) between two charges (q1 and q2) is proportional to the product of the charges and inversely proportional to the square of the distance between them.
Mathematically, Coulomb's law is represented as:
F = k * (|q1| * |q2|) / r^2,
where F is the force, k is the electrostatic constant (9 × 10^9 N m^2/C^2), |q1| and |q2| are the magnitudes of the charges, and r is the distance between the charges.
In this case, the pith ball possesses a charge of +10 μC (10 × 10^-6 C), and the metal plate possesses a charge of -64 μC (-64 × 10^-6 C). The distance between them is 0.02 m.
Plugging in the values into Coulomb's law:
F = (9 × 10^9 N m^2/C^2) * ((10 × 10^-6 C) * (-64 × 10^-6 C)) / (0.02 m)^2.
Simplifying the calculation:
F = (9 × 10^9 N m^2/C^2) * (-640 × 10^-12 C^2) / (0.0004 m^2).
F = -2.56 × 10^-3 N.
Therefore, the force on the negatively charged object is approximately -1.44 N (since the negative sign indicates the direction of the force).
The force on the negatively charged object is approximately -1.44 N. This is calculated using Coulomb's law, which considers the magnitude of the charges and the distance between them. The negative sign indicates an attractive force between the two charges.
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Finding the charge: Two spheres 6.0 units apart, attract each other with a force of 3 x 10 9 N. Determine them magnitude of the charge on one sphere if the other sphere has a charge of 9 E-8.
Answers
F = k * q1 * q2 / r^2
where F is the force of attraction, k is Coulomb's constant (8.99 x 10^9 Nm^2/C^2), q1 and q2 are the charges on the spheres, and r is the distance between the centers of the spheres.
Given that the force of attraction between the two spheres is 3 x 10^9 N and the distance between them is 6.0 units, we can substitute the values into Coulomb's law to find the magnitude of the charge on one of the spheres:
3 x 10^9 = k * q1 * 9 x 10^-8 / 6^2
Solving for q1, we get:
q1 = (3 x 10^9 * 6^2) / (k * 9 x 10^-8)
q1 = (3 x 10^9 * 36) / (8.99 x 10^9 * 9 x 10^-8)
q1 = 2.16 x 10^-7 C
So, the magnitude of the charge on one of the spheres is 2.16 x 10^-7 C
A sprinter runs a 100 m dash in 12.0 s. She starts from rest with a constant acceleration ax for 2.0 s and then runs with constant speed for the remainder of the race.
Answers
the value of ax, given the data from the question is 4.55 m/s²
Data obtained from the questonFrom the question given above, the following data were obtained:
Total distance travelled = 100 mTotal time = 12 sTime for acceleration (t) = 2Acceleration (a) = ax =?How to determine the distance travelled in the first 2 sInitial velocity = 0 m/sAcceleration (a) = axTime (t) = 2 sDistance (s) for the first 2 s = ?s = ½at²
s = ½ × ax × 2²
s = 2ax
How to determine the velocity in the first 2 sAcceleration (a) = axTime for acceleration (t) = 2 sVelocity for the first 2 s (v) = ?v = at
v = ax × 2
v = 2ax
How to determine the value of axRemaining distance = velocity × remaining time
Remaining time = 12 - 2 = 10
Remaining distance = 2ax × 10
Remaining distance = 20ax
Total distance = Distance for first 2 s + Remainng distance
100 = 2ax + 20ax
100 = 22ax
Divide both sides by 22
ax = 100 / 22
ax = 4.55 m/s²
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All indicate that the universe is
A) rotating.
B) expanding.
C) shrinking.
D) at equilibrium.
Answers
Answer:
if its talking about earth then rotate I'll say
Answer:
universe is expanding
Explain why the car in the photograph would get hot on a sunny day. How will the sunshield help to keep the car cool?
Answers
it will avoid the sun rays from penetrating into the glass to make it hot,and even fall on the seat and burn
Explanation:
Because of the type of metal it was made with
Answer:
The car gets hot in the photograph because of greenhouse effect. Most noticeably the fact that the sunlight enters the car through the windows to heat up the inside surfaces, which then gets trapped inside the car, causing a buildup of temperature.
Sunscreen can help keep the car cool by reflecting the sunlight, which in turn reduces the amount of heat that enters the car. This also decreases the inside surfaces to the exposure of UV lights.
Why did the lemon battery work and how many volts does one produce?
O The juice of the lemon is an acid and the acid caused 2 volts.
O The juice of the lemon is an electrolytic solution allowing electrons to flow and created around 5 V.
O The juice of the lemon is an electrolytic solution allowing electrons to flow and created around 1.5 V.
O The juice of the lemon is an acid and the acid caused 1 volt.
Answers
Answer:
the third one
Explanation:
A uniform E-field of magnitude E and directed horizontally fills a region of space. Points A through E are all inside the uniform field and form a rectangle with purely horizontal length d and purely vertical height h. Point C is in the center of this rectangle. A line from A to C makes an angle of θ with the direction of the E-field.
What is the magnitude of the electric potential difference between points A and E? Ignore the sign of this difference.
a. Ed
b. Ecos (0)/h2
c. E /d2+ h2
d. Edcos (0)
e. E/d2
Answers
The magnitude of the electric potential difference between points A and E is option (a) Ed
The electric potential difference between two points in an electric field is given by the product of the magnitude of the electric field and the distance between the points, multiplied by the cosine of the angle between the electric field and the direction of the displacement.
In this problem, we need to find the magnitude of the electric potential difference between points A and E, which are at opposite corners of the rectangle. We can find this difference by adding the potential differences between A and C, and between C and E. Since point C is at the center of the rectangle, the potential difference between A and C is the same as the potential difference between B and C, and the potential difference between C and E is the same as the potential difference between D and C.
Let's consider the potential difference between A and C. The distance between A and C is h/sin(θ), and the angle between the electric field and the direction of the displacement is θ. Therefore, the potential difference between A and C is:
ΔVAC = E × h/sin(θ) × cos(θ) = E × h cos(θ)/sin(θ) = E × h cot(θ)
Similarly, the potential difference between C and E is:
ΔVCE = E × h/sin(θ) × cos(θ) = E × h cos(θ)/sin(θ) = E × h cot(θ)
Therefore, the potential difference between A and E is:
ΔVAE = ΔVAC + ΔVCE = E × h cot(θ) + E × h cot(θ) = 2Eh cot(θ)
Now, we need to eliminate θ from the expression above. Note that d = h/tan(θ), so cot(θ) = 1/tan(θ) = d/h. Substituting this in the expression above, we get:
ΔVAE = 2Eh cot(θ) = 2Eh (d/2h) = Ed
Therefore, the correct option is (a) Ed
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Newton would agree that all objects on Earth exert a
gravitational pull on Earth.
TRUE
FALSE
Is true
Answers
Answer:
pretty sure it's true....
Which part of an amino acid's basic structure gives it its unique functional characteristics? Choose 1 answer: А R-group B Central alpha (a) carbon Carboxyl group (-COOH) Amino group (-NH2)
Answers
Answer:
A. R- group
Explanation:
The part of an amino acid's basic structure gives it its unique functional characteristics is R-group.
What is amino acids?Amino acids are smaller molecules that join or combine together through peptide bond to form protein. They are refer to the building block of protein.
Therefore, The part of an amino acid's basic structure gives it its unique functional characteristics is R-group.
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If the pressure at a point is Im of water, what will be it's value in terms of 1m of oil? (Take, the density of oil to be 0.8 g/cm³) A. 0.8 B. 1 C. 1.25 D. 2.5
Answers
The value in terms of 1m of oil is 1.25
How to solve for the valueTo convert the pressure at a point from 1 meter of water to its equivalent value in meters of oil, we can use the following formula:
Pressure = height × density × gravity
Let's first find the pressure exerted by 1 meter of water.
1 g x 0.8 = 0,8
1 x g x 1m = 0.8 x g * h2
We are to solve for h2
h2 = 1 / 0.8
= 1.25
Hence tghe value in terms of 1m of oil is 1.25
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Two pith balls are both charged by contact with a plastic rod that has been rubbed by cat fur.What sign will the charges on the pith balls have?
Answers
When two pith balls are charged by contact with a plastic rod that has been rubbed by cat fur, the charges on the pith balls will have the same sign. This is because rubbing the plastic rod with cat fur transfers electrons from the fur to the rod, leaving the rod with a net negative charge.
When the charged rod comes into contact with the pith balls, some of the excess electrons on the rod will transfer to the pith balls, giving them a negative charge as well.
Since the transfer of electrons results in both the rod and the pith balls having a negative charge, the charges on the pith balls will be the same as the rod's charge, which is negative.
Therefore, the pith balls will have a negative charge after being charged by contact with the plastic rod rubbed by cat fur.
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true or false: as the momentum of a particle of mass m increases, its wavelength increases.
Answers
Answer:
False. Momentum of particle is inversely proportional to wavelength.
Explanation:
The momentum of a particle is related to its de Broglie wavelength, according to the de Broglie wavelength equation:
λ = h / p
where λ is the wavelength, h is the Planck constant, and p is the momentum of the particle. As we can see from the equation, as the momentum increases, the wavelength decreases.
Therefore, as the momentum of a particle of mass m increases, its wavelength decreases, not increases.
A car sets off from the traffic lights. It reaches a speed of 27 m/s in 18 seconds. What is its acceleration?
Answers
Answer:
1.6875m/s²
Explanation:
\( acceleration = \frac{final \: velocity \: - \: initial \: velocity}{time \: taken} \)
a = unknown.
v (final velocity) = 27m/s
u (initial velocity) = 0m/s (as the car was stationary in the traffic lights).
t (time taken) = 18s
\(a = \frac{27 - 0}{16} \)
acceleration = 1.6875m/s²
hope it helps. :)
what is kinetic energy, in your own words but be more detailed about what you say.
Answers
Kinetic energy is the energy when a object is in motion. ... energy gets transferred to the object, The energy transferred is kinetic energy, and it depends on the mass and speed.
Explanation:
Does the lower magnet float as well? Explain your ideas.
Answers
Answer:
Without more information about the lower magnet and the conditions under which the experiment is being conducted, it is difficult to provide a definitive answer. However, in general, whether or not the lower magnet floats depends on its density and the density of the surrounding medium.
If the lower magnet is less dense than the surrounding medium, it will float. If it is more dense, it will sink. If the lower magnet is the same density as the surrounding medium, it will remain suspended at that level.
It is also important to consider other factors such as the strength of the magnetic force and any other forces acting on the magnets. These factors can affect the behavior of the magnets and the overall outcome of the experiment.
The car travels 28m in 7s. What is the speed of the car?
Answers
The Speed of the car is 4m/s.
What is the speed?
The speed of an object can be defined as the total distance traveled by it in a particular interval of time. This can be determined by dividing the total distance moved by the object by the time taken to move.
It is the ratio of distance in m and time taken by the object to travel in seconds.
Hence: Distance D=28m
Time T=7s
Speed S=D/T
S=28m/7S
S=4m/S
Therefore car's speed is 4m/S
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The speed of the car is 4m/s
What is speed?Speed is the rate of change of distance with time.
It is a scalar quantity and it's S.I unit is given as m/s. Distance is the space or gap between two point. Speed can generally be defined as the distance travelled per a given time
From the definition, speed = distance/time
distance is 28m and time is 4s, therefore
Speed = 28/4= 7m/s.
Therefore the speed of the car is 7m/s
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Which of the following is an example of an opposing force?
A.Gravity pulling a ball down a hill
B.Wind blowing a leaf off of a tree
C.Gravity holding a rock still on the ground
D.Water pushing against someone as they wade through a pool
Answers
What is the final charge state of sphere B?
Answers
Charges with opposing charges (positive and negative) attracted each other. At the end, the charges on both spheres will be the same, -1nc.
What is charge?Charge is commonly used in chemistry and physics to refer to electric charge, which is the conserved feature of some subatomic particles that governs their electromagnetic interaction. Charge is a physical attribute that causes matter inside an electromagnetic field to experience a force.
Electric charges can be either positive or negative. If there is no net electric charge, the substance is termed neutral or uncharged. Like charges repel each other (for example, two positive charges repelling two negative charges). Charges with opposing charges (positive and negative) attracted each other. At the end, the charges on both spheres will be the same, -1nc.
Therefore, at the end, the charges on both spheres will be the same, -1nc.
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Few meteors make it through the thick air of this planet without disintegrating. True or false?.
Answers
Few meteors make it through the thick air of this planet without disintegrating. This statement is false.
Meteors refer to heavily sized metallic objects or rock fragments that are formed as a result of a collision between asteroids.
These rock lumps revolve around the sun and are smaller in size than asteroids.
Their size ranges from grain-sized particles to about 1 meter wide objects
As they enter the atmosphere of earth they crash forming streaks of light and disintegrate into small-sized dust particles and never get through the thick air of the earth.
However, they impact the earth in several ways such as heating the earth's surface.
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A box is pushed horizontally with 30N for 3m. How much work was done?
Answers
in the game of croquet, a player moves a ball around a course by striking the ball with a mallet all the players take turns striking there own balls the photo shows some kind of result of one kind of play.
what most likely causes the motion of the purple ball in the photo.
Answers
Answer:Kinetic energy from the mallet is transformed first to the orange ball and then to the purple ball.
Explanation:
what is the angular magnification of the moon if you view its real image from 25 cm away, your near-point distance?
Answers
The angular magnification of the moon if you view its real image from 25 cm away, your near-point distance 6.4.
When viewing the real image of the moon from a distance of 25 cm, which is your near-point distance, the angular magnification of the moon is 6.4. Angular magnification can be defined as the ratio of the angle subtended at the eye by the image and the angle subtended at the eye by the object. The angular magnification (M) of the moon when viewed through an optical device is given by the formula: M = (angular size of the image) / (angular size of the object)
In this case, you are viewing the real image of the moon from your near-point distance (25 cm), but you have not provided any information about the optical device being used, such as a telescope or a magnifying glass. Therefore, it is not possible to calculate the angular magnification without this information.
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(10) A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing its speed from 0 to 6. 00 m/s in 0. 774 s. (a) What is the magnitude of the linear impulse experienced by a 70. 2 kg passenger in the car during this time? Submit Answer Tries 0/10 (b) What is the average force experienced by the passenger? 5. 44x102 N You are correct. Previous Tries Your receipt no, is 155-4422
Answers
The magnitude of the linear impulse experienced by the passenger during this time is 421.2 kg·m/s and the average force experienced by the passenger is approximately 5.44 × 10^2 N.
(a) To calculate the magnitude of the linear impulse experienced by the passenger, we can use the equation:
Impulse = mass × change in velocity
Given:
Mass of the passenger (m) = 70.2 kg
Change in velocity (Δv) = 6.00 m/s - 0 m/s = 6.00 m/s
Substituting the values into the equation, we get:
Impulse = 70.2 kg × 6.00 m/s = 421.2 kg·m/s
Therefore, the magnitude of the linear impulse experienced by the passenger during this time is 421.2 kg·m/s.
(b) To find the average force experienced by the passenger, we can use the equation:
Average force = Impulse ÷ time
Given:
Impulse (I) = 421.2 kg·m/s
Time (t) = 0.774 s
Substituting the values into the equation, we get:
Average force = 421.2 kg·m/s ÷ 0.774 s = 544.0 N (rounded to three significant figures)
Therefore, the average force experienced by the passenger is approximately 5.44 × 10^2 N.
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How fast, (vfx)q, will the quarterback be moving backward just after releasing the ball?
An 80-kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizontally at 15 m/s . How fast will he be moving backward just after releasing the ball?
Answers
Applying the momentum principle, v = 0.08 m/s.
The Momentum Principle controls how a system moves. This theory explains how a system modifies its motion in response to a net force. We note that there is no net force acting on objects moving in a straight path at constant speed.
p = m v . The equation demonstrates that momentum is directly related to an object's mass (m) and velocity (v). As a result, an object's momentum increases with increasing mass or velocity. The momentum of a large, swift object is larger than that of a small, slower object.
80 kg for the quarterback and 0.43 kg for the ball.
initially both together, but with a horizontal velocity of zero.
Final momentum is equal to 15*0.43 - 80v starting momentum (law of conservation of momentum)
6.45 = 80v
v = 0.08 m/s
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a ball is thrown vertically upward with a speed of 30.0 m/s. how long does it take to reach its highest point?
Answers
It takes the ball 3.06 seconds to reach its highest point
To find how long does it take to reach its highest point
The time it takes for a ball to reach its highest point is given by the equation:
t = v / g
where
t is the time in secondsv is the initial velocity in meters per secondg is the acceleration due to gravity, which is approximately \(9.8 m/s^2\)In this case, the initial velocity is 30.0 m/s and the acceleration due to gravity is \(9.8 m/s^2\). Therefore, the time it takes for the ball to reach its highest point is:
\(t = 30.0 m/s / 9.8 m/s^2 = 3.06 s\)
Therefore, it takes the ball 3.06 seconds to reach its highest point.
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is the change in position of an object
Answers
Answer:
Explanation:
In my opinion motion is the correct answer