The average force on our body when jump off a step, having a stiff-legged landing is 10 time smaller. Thus, the correct answer is option D, reduced by 10.
What is average force?The average force is the force exerted by an object moving at a given rate of speed, i.e. velocity, over a given time period. The term "average" is used here to indicate that the velocity is not instantaneous or precisely measured.
When we jump from a certain height and bend our knees upon reaching the ground, the time it takes to come to complete rest is increased by ten times , and the impact force is reduced to one-tenth of its initial value. This is consistent with Newton's second law of motion, which states that the rate of change in velocity is proportional to the force applied to the body.
Therefore, if you make the time of the impact about 10 times as great as for a stiff-legged landing, the average force that you experience would be 10 times smaller.
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Which will ensure laboratory safety during the experiment? Check all that apply. using beaker tongs to handle the hot beaker reading the thermometer accurately checking the beaker for chips prior to heating on the hot plate using a beaker instead of an Erlenmeyer flask turning off the hot plate after use
Answer: • using beaker tongs to handle the hot beaker.
• checking the beaker for chips prior to heating on the hot plate.
• Turning off the hot plate after use
Explanation:
The options that will ensure laboratory safety during the experiment will be:
• using beaker tongs to handle the hot beaker.
• checking the beaker for chips prior to heating on the hot plate.
• Turning off the hot plate after use.
We should note that the beaker tongs are simply used in the holding of the beakers that have hot liquids in them. Also, it s vital for the hot plate to be turned off after its use so as to prevent accident.
Using beaker tongs to handle the hot beaker reading the thermometer accurately checking the beaker for chips prior to heating on the hot plate ensure laboratory safety throughout the experiment:
What is an experiment?An experiment is a technique used to prove or disprove a theory, or to test the efficiency or probability of something that has never been done before.
Experiments reveal cause-and-effect relationships by illustrating what happens when a specific component is changed.
The following options will ensure laboratory safety throughout the experiment:
1.Handling the heated beaker using beaker tongs.
2.Inspecting the beaker for chips before heating it on the hot plate.
3.After using the hot plate, turn it off.
Hence all the given options are correct.
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Magnesium has a charge of +2, and chlorine has a charge of –1. To form a chemical bond, how many magnesium ion(s) would the compound have? 0 1 2 3
Answer:
1
Explanation:
Just one. Because from the way compounds are named and or written. The elements exchange their number of valence electron to complement each other. So, a magnesium of +2 and a Chlorine of -1 when exchanged would give the formula of
MgCl(2)
And as we can tell from the formula of the compound I just write down, Magnesium has just a single ion in it, while Chlorine has 2.
So the answer is 1.
Answer:
the answer is 1
Explanation:
i took the test on edge 2023 and got it right
A carpenter lifts a 10 kg piece of wood to his shoulder 1.5 m above the ground. What is the wood's potential energy on the carpenter's shoulder? (*Hint: "g" is the acceleration due to gravity of an object on Earth. G = 10 m/s^2)
Answer:
The wood's potential energy on the carpenter's shoulder is 150 J.
Explanation:
Given;
mass of the wood, m = 10 kg
height through which the wood was raised, h = 1.5 m
acceleration due to gravity, g = 10 m/s²
The wood's potential energy on the carpenter's shoulder is calculated as;
P.E = mgh
P.E = 10 x 10 x 1.5
P.E = 150 J
Therefore, the wood's potential energy on the carpenter's shoulder is 150 J.
A car is launched by a spring and goes to the top of a loop. Fill in the energy bar chart by drawing a vertical bar(s) in the correct position (both Initial & Final conditions).
Answer:
A) the initial point all energy is elastic potential and the final point all energy is kinetic
B) a bar graph the two bars have the same height and the sum of their height is the initial energy
C) two bars, one for the kinetic energy and the other for the gravitational potential energy.
Explanation:
A) For this exercise we must use the energy conservation relations
starting point. When the spring is compressed
Em₀ = K_e = ½ k x²
end point, at the bottom of the loop
Em_f = K = ½ m v²
energy is conserved
Em₀ = Em_f
½ k x² = ½ m v²
v = [tex]\sqrt{ \frac{k}{m} }[/tex] x
In a bar graph the initial point all energy is elastic potential and the final point all energy is kinetic
B) intermediate point in a quarter of the radius
In this case we use the lower part of the loop as the starting point and the quarter part of the bow as the end point.
Em₀ = K
Em_f = K + U = ½ m v² + m g R
in a bar graph the two bars have the same height and the sum of their height is the initial energy
C) End point highest part of the loop
starting point, bottom of loop
Emo = K = ½ m v₀²
from part A of the exercise we saw that it is equal to the elastic energy of the spring
final point. Highest part of the loop
Emf = K + U
Em_f = ½ m [tex]v_{f}^2[/tex] + mg (2R)
where R is the radius of the loop
Em₀ = Em_f
1/2 m v₀² = 1/2 m v_{f}^2+ mg 2R
v₀² = v_f^2 + 4gR
In a bar graph there are two bars, one for the kinetic energy and the other for the gravitational potential energy. The sum of the heights of these bars is the initial energy, so the energy is transformed but not created or destroyed in the process.
An airplane is flying in a horizontal circle at a speed of 100 m/s. The 80.0 kg pilot does not want the centripetal acceleration to exceed 7.00 times free-fall acceleration.
Answer:
The force will be "5,488". A further solution is provided below.
Explanation:
The given values are:
speed,
v = 100m/s
mass,
m = 80 kg
acceleration,
a = 7
Now,
Radius will be:
⇒ [tex]r=\frac{v^2}{ac}[/tex]
⇒ [tex]=\frac{(100)^2}{7\times 9.8}[/tex]
⇒ [tex]=\frac{10000}{68.6}[/tex]
⇒ [tex]=145.77[/tex]
Force will be:
⇒ [tex]F=m\times ac[/tex]
⇒ [tex]=80\times 68.6[/tex]
⇒ [tex]=5488[/tex]
frequency of sound determines its _____ measured in _____.
amplitude: amplitude of sound wave determines its _____ measured in _____.
Answer:
Loudness of sound is determined by its amplitude.
Loudness of sound is determined by its amplitude.The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases.
if a car was moving at a speed of 25mph for 6 hours, how far would the car travel?
Answer:
150 miles
Explanation:
25mph x 6hrs = 150miles
A 1.00 kg ball traveling towards a soccer player at a velocity of 5.00 m/s rebounds off the soccer
player's foot at a velocity of 8.50 m/s. If the time of contact between the ball and the player's foot
was 2.00 x 10-2 seconds, what was the force that the foot applied on the ball?
this is the second question
A 1.50 kg rock falls from the top of a 10.0 m high building and strikes the ground below. Calculate
the impulse experienced by the rock during its fall.
Answer:
A) F = - 8.5 10² N, B) I = 21 N s
Explanation:
A) We can solve this problem using the relationship of momentum and momentum
I = Δp
in this case they indicate that the body rebounds, therefore the exit speed is the same in modulus, but with the opposite direction
v₀ = 8.50 m / s
v_f = -8.50 m / s
F t = m v_f -m v₀
F = [tex]m \frac{(v_f - v_o)}{t}[/tex]
let's calculate
F = [tex]1.00 \ \frac{(-8.5-8.5)}{2 \ 10^{-2}}[/tex]
F = - 8.5 10² N
B) let's start by calculating the speed with which the ball reaches the ground, let's use the kinematic relations
v² = v₀² - 2g (y- y₀)
as the ball falls its initial velocity is zero (vo = 0) and the height upon reaching the ground is y = 0
v = [tex]\sqrt{2g y_o}[/tex]
calculate
v = [tex]\sqrt{2 \ 9.8 \ 10}[/tex]
v = 14 m / s
to calculate the momentum we use
I = Δp
I = m v_f - mv₀
when it hits the ground its speed drops to zero
we substitute
I = 1.50 (0-14)
I = -21 N s
the negative sign is for the momentum that the ground on the ball, the momentum of the ball on the ground is
I = 21 N s
(a)The force that the foot applied on the ball will be 175 N.
(b)The impulse experienced by the rock during its fall will be 21 Ns.
What is impulse?The change in momentum of an item when it is operated upon by a force for a period of time is known as an impulse.Impulse is given by the change in momentum,
I=ΔP
The given data in the question will be
m is the mass of soccer ball = 1.00 kg
u is the velocity by which ball hits =5.00 m/sec
v is the velocity by which ball rebounds=8.50 m/sec.
(a) The force that the foot applied on the ball will be 175 N.
If the ball rebounds with the the velocity of 8.50m/sec then
[tex]\rm F= \frac{m(v-u)}{t} \\\\\rm F= \frac{1(8.50-5.00)}{2.00\times10^{-2}}\\\\\rm F=175 N[/tex]
Hence the force that the foot applied on the ball will be 175 N.
(b)The impulse experienced by the rock during its fall will be 21 Ns.
According to Newton's third equaton of motion.
[tex]\rm v^2=u^2+2gh\\\\\rm v^2=2\times9.81\times10.0\\\\\rm v=\sqrt{2\times9.81\times10.0} \\\\\rm v= 14.0071 m/sec[/tex]
Due to the free fall condition the initial velocity is zero,
Impulse is given by the change in momentum,
I=ΔP
I=m(v-u)
[tex]\rm I=m(v-u)\\\\\rm I=1.50(14.0-0)\\\\\rm I=21 Ns[/tex]
Hence the impulse experienced by the rock during its fall will be 21 Ns.
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A star is known to be moving at 8.46km/s toward the earth. If you observe the spectral line to be at 5.02nm, at what wavelength would you expect to measure the spectral line in a lab?
Answer:
[tex]\lambda_x=5.019858nm[/tex]
Explanation:
From the question we are told that
Speed of star [tex]S=8.46km/s[/tex]
Distance of spectral line [tex]\lambda_0= 5.02nm[/tex]
Generally the equation for wavelength with respect to spectral lines is mathematically given by
[tex]\lambda=\lambda _0 *\frac{v}{c}[/tex]
where
[tex]\lambda_0= length\ of\ spectral\ line[/tex]
[tex]c=The\ speed\ of\ light[/tex]
[tex]v= speed\ of\ moving\ object[/tex]
therefore
[tex]\lambda=5.02*10^{-9} *\frac{8.46*10^{12}}{299 792 458*10^9}[/tex]
[tex]\lambda=1.42*10^{-4} nm[/tex]
Generally the equation for new wavelength is mathematically given as
[tex]\lambda_x=\lambda _0-\lambda[/tex]
[tex]\lambda_x=5.02 nm-1.42*10^{-4} nm[/tex]
[tex]\lambda_x=5.02-1.42*10^{-4}[/tex]
Therefore
[tex]\lambda_x=5.019858nm[/tex]
15. Find the speed of a disc of radius 0.5 meters and mass 2-kg at the base of the incline. The disc starts at rest and rolls down the incline with a height of 5 meters without slipping. The incline makes a 20° angle with the horizontal surface.
Explanation:
sorry_______________
3. Waves in a lake are 6.0 m apart and pass a person on a raft every 2.0 s.
What is the speed of the waves?
The speed of wave is 3m/s
What is a Wave Equation ?It is a linear second order partial differential equation which describe the propagation of oscillation at a fixed speed in some quantity .
Since , f = 1/t
f = 1/2 = 0.5 Hz
from wave equation
v(speed) = frequency * wavelength
v(speed ) = 0.5 * 6
v(Speed) = 3 m/s
Hence , The speed of wave is 3m/s
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PLEASE HELP WITH THE 6 FOLLOWING SCIENCE QUESTIONS (the topic is circuit symbols and equations):
1. How much charge flows through a speaker if it is on for 20 minutes and has a current of 10A?
2. 500 coulombs of charge flow through a bulb for 25 seconds. Calculate the current trough the bulb.
3. 12A of current and 984C of charge flow through a kettle. How long was the kettle switched on for?
4. A laptop is switched on for 5 hours. It has a current flowing through it of 12A. What is the total amount of charge that flowed through the laptop?
5. An ipad is left in standby mode for 3 hours. During this time, 2.16C of charge flowed through the ipad. How much current flowed through the ipad?
6. A small LED light as 200mA of current flowing through it and a charge flow of 150C. How many minutes and seconds was the light switched on for?
genuine answers please, don't waste answer slots if you don't actually have an answer, it's rather irritating x
1) I=Q/T then Q= I ×T 10* ( 20*60) = 10 (120) therefore the answer is 1200C
2) I= Q/T that is 500/ 25 and the answer is 20A
Which phenomenon occurs when one wave is superimposed on another ?
a.polarization
b.diffraction
c.refraction
d.interference
Answer:
interference
Explanation:
a p e x :))
Why might a PC monitor be covered with dust?
After gaining electrons from the cloth, can the polythene rod attract small pieces of paper?
Answer:
The attractive forces between the dust particles and Television Screen is due to static electricity. The free dust particles have some residual charge due to force of friction from air or colliding dust particles while the television screen has an opposite charge. They attract and dust settles on it.If a polythene rod is rubbed with cloth, the rod can lift small pieces of paper. This can be explained by stating that the rod becomes charged. A charged object will attract a neutral object until it touches and then it is repelled.Explanation:
Which of the following describes how energy is converted when a cat knocks a plant off of a counter?
A. The potential energy of the car is converted into kinetic energy.
B. The kinetic energy of the cat is converted into potential energy.
C. The potential energy of the plant is converted into kinetic energy.
D. The kinetic energy of the plant is converted into potential energy.
Answer:
c
Explanation:
tell me if im write
A 20 kg mass is flung at a velocity of 12 m/s. What is the kinetic energy of the object?
Answer:
[tex]\boxed {\boxed {\sf 1440 \ Joules}}[/tex]
Explanation:
Kinetic energy can be found using this formula:
[tex]E_k= \frac{1}{2} mv^2[/tex]
The mass is 20 kilograms and the velocity is 12 meters per second.
[tex]m= 20 \ kg \\v= 12 \ m/s[/tex]
Substitute the values into the formula.
[tex]E_k= \frac{1}{2} (20 \ kg)(12 \ m/s)^2[/tex]
Solve the exponent first.
(12 m/s)²= 12 m/s * 12 m/s = 144 m²/s²[tex]E_k= \frac{1}{2} (20 \ kg)(144 \ m^2/s^2)[/tex]
Multiply the numbers in parentheses.
[tex]E_k= \frac{1}{2} (2880 \ kg*m^2/s^2)[/tex]
Multiply by 1/2 or divide by 2.
[tex]E_k=1440 \ kg*m^2/s^2[/tex]
1 kilogram square meter per square second is equal to 1 Joule. Our answer of 1440 kg*m²/s² is equal to 1440 J[tex]E_k= 1440 \ J[/tex]
The object's kinetic energy is 1440 Joules.
Which of the following quantities is a vector?
A. 400 gallons per minute
B. 312 days
C. 1056 grams
D. 3 feet per second north
Answer:
D
Explanation:
vectors have direction!
A car with a speed of 50ms is stopped when its brakes are pressed. The displacement passed before stopping is 150 m. How much deceleration is the car?
What is the distance from one peak to the next peak called?
(multiple choice)
a. crest
b. wavelength
c. amplitude
d. resting point
(choose 1 or more)
Answer:
b. wavelength
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.
Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.
Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data.
The distance from one peak to the next peak is called wavelength. This distance is also equal to the distance from one trough of a wave to another.
Mathematically, wavelength is calculated using this formula;
[tex] Wavelength = \frac {speed}{frequency} [/tex]
which of theres is the correct unit for speed? a) m/s- meters per second b) j- joules c) n- newtons
Since the speed formula is = Distance / time
speed = distance /time
speed = metre/ seconds
speed = m/s
Answer:
a) m/s- meters per second
Explanation:
Recall that m/s (meters per second) is the official derived SI unit for speed. That is, it is length (meters) over time (second), hence m/s.
It can't be joules (J), since that is the SI unit for work & energy.
It also can't be newtons (N), since that is the SI unit for force.
Therefore, the correct answer is a) m/s- meters per second.
I hope this made sense to you, if not, feel free to let me know and I can try to provide further assistance.
Part A: Multiple TRUE/FALSE
1. Which of the following statements about vectors and scalars are TRUE? List all that apply.
- A vector is a large quantity and a scalar is a small quantity.
- A scalar quantity has a magnitude and a vector quantity does not.
- A vector quantity is described with a direction and a scalar is not.
-Scalar quantities are path dependent quantities and vector quantities are not.
- A scalar quantity depends only upon the initial and final values of the quantity; this is not the case for vector quantities.
- The quantity 20 m/s, north is a speed and as such is a scalar quantity.
- The quantity 9.8 m/s/s is an acceleration value and as such is a vector quantity.
A vector quantity is described with a direction and a scalar is not.
Scalar quantities are path-dependent quantities and vector quantities are not.
Explanation:
Scalar quantity:
It is a physical quantity that only has magnitude.It is a 1-dimensional Its changes when magnitude changes.It can't be resolved.It is a path-dependent quantity.If any mathematical operation is applied between two or more scalar quantities will give a scalar.For example: mass, time, energy, etcVector quantity
It is a physical quantity that has magnitude and direction.It can be the 1-dimensional,2-dimensional, or 3-dimensional Any change in it changes its direction or magnitude or both.It can be resolved.It only depends on the initial and final values of quantities.If any mathematical operation is applied between two or more vector quantities will give a scalar or vector.For example: force, velocity, pressure, etc.So from this, we can conclude that the true statements out given statements in the question are:
A vector quantity is described with a direction and a scalar is not.
Scalar quantities are path-dependent quantities and vector quantities are not.
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Squeezing due to differences in the gravitational force of the moon at different points on earth causes
Answer:
the most important effect of the gravitational force is the change in the tide.
Explanation:
The gravitational force between the Moon and the Earth is given by
F = G m M / r2
where m is the mass of the Moon, M the mass of the Earth, and r the distance between the two.
The magnitude that changes in this formula is the distance between the Moon and the Earth, due to the lunar rotation, at the points of maximum approach in the periods of high tide and in the periods of greater distance the tide is low.
It should be mentioned that the earth's crust is also affected, but its movement is much less than that of water, which is why in almost all cases it is taken as fixed.
Lately it has also been analyzed that the Earth-Moon structure creates greater stability in the rotation of the two bodies.
Consequently the most important effect of the gravitational force is the change in the tide.
A baseball is launched horizontally from a height of 1.8 m. The baseball travels 0.5 m before hitting the ground.
How fast is the baseball moving horizontally, rounded to the nearest hundredth? m/s
Answer:
2.7
Explanation:
should ya just add the 2
Answer:
2.7
Explanation:
edge 2021
The Gulf Stream is an ocean current that runs from the southern tip of Florida up the eastern coast of the U.S. And ends in the North Atlantic. How would this Northern flowing stream affect the coast of Europe?
Answer:
The Northern flowing stream will affect the coast of Europe by making climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current
Explanation:
The Northern flowing stream will affect the coast of Europe because the North Atlantic current causes the Gulf stream to be split into two ( 2 ) and the Northern stream which is a warm stream crossing over to Northern Europe. The Gulf stream makes climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current
How can sleep improve the digestive system?
Answer: sleep helps the body produce the hormones
Explanation:
Answer:
a healthy sleep cycle helps the body produce the hormones melatonin and prolactin, which have been found to improve the good bacteria in the intestines and help digestion.
Explanation:
What is the impulse of a dodgeball hitting a person in the face if it's initial velocity was 10m/s and it's velocity after hitting him in the face it is 5m/s? The ball weighs 3kg.
Answer:)
Explanation:)
The frequency of a sound wave corresponds to its
Match the type of boundary with it's characteristic
Answer:
Transform= not destroyed or created
Divergent= crust created
Convergent= crust destroyed
Explanation:
The plates move in the opposite or away from each other at a transforming plate boundary. The two platform borders are not produced or destroyed in this case. As both plates converge on each other and thus destroy the plates for converging plate boundaries. When the plate is divergent, both plates shift away from each other by opening up and solidification for a new crust.
Answer:
Transform= not destroyed or created
Divergent= crust created
Convergent= crust destroyed
Explanation:
Can you find the net force of one vertical force and one horizontal force, such as in the picture below? Yes or no, and why?
Answer:
jwuwhisbuebeu said that good morning and private s the
Answer:
the answer to this question is a⁵/c²
could you help me with this question: Aspherical shell is formed by taking a solid sphere of radius 24.0 cm and hollowing out a spherical section from the shell’s interior. Assume the hollow section and the sphere itself have the same center location (that is, they are concentric). a) If the hollow section takes up 86.0 percent of the total volume, what is its radius? b) What is the ratio of the outer area to the inner area of the shell?
Answer:
La vdd tengo la misma duda, de q prepa eres?
Explanation:
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