Answer:
A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist.
Explanation:
five difference between elastic collision and inelastic collision?
Answer:
Elastic Collision
Inelastic Collision
The total kinetic energy is conserved. The total kinetic energy of the bodies at the beginning and the end of the collision is different.
Momentum does not change. Momentum changes.
No conversion of energy takes place. Kinetic energy is changed into other energy such as sound or heat energy.
Highly unlikely in the real world as there is almost always a change in energy. This is the normal form of collision in the real world.
An example of this can be swinging balls or a spacecraft flying near a planet but not getting affected by its gravity in the end.
A 45,000-kg airplane experiences a force from its engines of 110,000 N. What is the acceleration of the airplane?
A.0.41 m/s^2
B.0.82 m/s^2
C.2.4 m/s^2
D.9.8 m/s^2
Answer:
The answer is option CExplanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{110000}{45000} = \frac{110}{45} = \frac{22}{9} \\ = 2.4444444...[/tex]
We have the final answer as
2.4 m/s²Hope this helps you
THE ONE WHO WILL ANSWER IT CORRECT WILL BE MARKED AS "BRAINLIST"....... If the radius of the orbit of a spaceship from the centre of the earth is twice the radius of the earth . then calculate the acceleration due to the gravity on space ship.
Answer:
Explanation:
19116 being the distance from the centre of the earth to the point you want to check in metres. So after all that you get G = 1.0888m/second squared. Hope that helps you/ you should be able to pop in any height you want.
plz mark as brainliest
Draw a force diagram of a 23kg box of eel tails being pulled with a rope horizontally across the
bumpy floor
Answer:
Please find attached, the required force diagram of the 23 kg box of eel tails being pulled with a rope horizontally across the bumpy floor
Explanation:
The steps required to draw a force diagram includes
1) The object on which the applied forces act is identified
2) The forces acting on the object are identified by the condition or state of the object, which may be stationary or in motion
3) Specify the object on the diagram using a spot
4) Each of the forces acting on the object (the spot) are added, in vector format, showing both the magnitude and the direction of the forces
The forces acting on the box are;
a) The weight of the box, [tex]F_w[/tex], acting vertically downwards, with a magnitude given as follows;
[tex]F_w[/tex] = Mass of box × Acceleration due to gravity = 23 × 9.81 = 225.63 N
b) The force of friction, [tex]F_f[/tex], acting in the opposite direction of motion of the box, with a magnitude given as follows;
[tex]F_f[/tex] = Weight of the box × Coefficient of friction
[tex]F_f[/tex] = 225.63 N × [tex]\mu _x[/tex]
c) The force pulling the box, [tex]F_p[/tex], = The mass of the block × The acceleration of the block
The direction of the pulling force = The forward direction of motion of the box.
While traveling along a highway a driver slows from 34 m/s to 15 m/s in 12 seconds. What is the automobile’s acceleration? (Remember that a negative value indicates a slowing down or deceleration.
Answer:
a=-1.58 m/s^2
Explanation:
Vo=34m/s
Vf=15m/s
t=12s
a= dV/dt = (Vf-Vo) /t = (15-34)/12
= - 19/12 = - 1.58m/s2
A wave passes into a different medium with an increase in speed. The ratio of the angle of incidence to the angle of refraction, defined arbitrarily here as R, is?
a) R=0
b) 1>R>0
c) R=1
d) R>1
Answer:
(d) R>1
Explanation:
Let the wave is passing from the medium [tex]M_1[/tex] to medium [tex]M_2[/tex] as shown in the figure.
Given that there is an increase in the speed in the medium [tex]M_2[/tex] , this is only due to the fact that medium
As when light passes from denser to rare medium, it moves away from the normal as shown in the figure.
So, the angle made by light rays with the normal in the rare medium, angle of refraction [tex]r[/tex], is more than the angle made by light rays with the normal in the denser medium, angle of incident [tex]i[/tex].
Hence, r>i
[tex]\Rightarrow \frac r i >1[/tex]
[tex]\Rightarrow R >1[/tex] [as r/i = R]
Hence, option (d) is correct.
A bicycle gear wheel is a disc with 50 ‘teeth' equally spaced around its edge, as shown. The gear wheel is rotated 10 times each second. A springy strip of metal is vibrated by the rotating ‘teeth'. The metal strip produces a sound of frequency that is equal to the frequency of vibration of the strip
Answer:
0.66mExplanation:
The question is not complete, here is the complete question, also see attached the image.
"A bicycle gear wheel is a disc with 50 ‘teeth’ equally spaced around its edge, as shown. The gear wheel is rotated 10 times each second. A springy strip of metal is vibrated by the rotating ‘teeth’. The metal strip produces a sound of frequency that is equal to the frequency of vibration of the strip. The speed of sound in air is 330ms–1. What is the wavelength of the emitted sound?"
given data
number of teeth= 50
we are told that the gear is rotated 10 times in 1 sec,
hence the frequency of the rotation past the strip is
=50*10
=500Hz
speed of sound= 330m/s
we know that
[tex]v_w = f \Lambda[/tex]-----------1
where Vw is the speed of sound,
f is its frequency, and
λ is its wavelength.
λ=Vw/f
λ=330/500
λ=0.66m
NEED HELP ASAP, WILL GIVE BRAINLIEST
Which is an example of convection currents?
marshmallows toasting over a campfire
a pot being heated by an electric burner
feet getting hot when stepping across sand
a radiator emitting warm air and drawing in cool air
Answer:
D-A radiator emitting warm air and drawing in cool air
Explanation:
A plane travels down a runway 2750 m before it lifts off at an angle of 37 degrees from the horizontal. The plane has traveled 1.8 km since its wheels left the ground. What is the displacement of the plane?
Answer: 4.236km
Explanation:
Let's define the point (x, y) as:
x = horizontal distance moved.
y = vertical distance moved.
If the plane starts in the point (0, 0) then:
"A plane travels down a runway 2750 m before it lifts off..."
At this time, the position will be:
P = (0 + 2750m, 0) = (2750m, 0).
"it lifts off at an angle of 37 degrees from the horizontal. The plane has traveled 1.8 km since its wheels left the ground."
In this case, as the angle is measured from the horizontal, the components will be:
x = 1.8km*cos(37°) = 1.438km
y = 1.8km*sin(37°) = 1.083 km
Then the new position is:
P = (2750m + 1.438 km, 0 + 1.083 km)
Let's write it using the same units for all the quantities:
we know that
1km = 1000m
Then:
2750m = (2750/1000) km = 2.750 km.
Then we can write the new position as:
P = (2.750 km + 1.438km, 1.083km) = (4.188km, 1.083km)
Now, we define the displacement as the distance between the final position and the initial position.
The distance between two points (a, b) and (c, d) is:
D = √( (a c)^2 + (b - d)^2)
In this case the points are:
(0, 0) for the initial position
(4.188km, 1.083km) for the final position.
And the displacement will be:
D = √( (4.188km - 0)^2 + (1.083 - 0)^2) = 4.236km
How do mechanical waves travel through a medium?
Answer:
sound waves need to travel through a medium such as solids,liquids and gases. hoped this helped
Explanation:
sound waves
In one half hour, a car traveled 35km. What was the speed of the car?
Answer:
70km/h
Explanation:
speed = distance /time
= 35/0.5
=70km/h
Can somebody help me with this carbon nuclides question please?
Answer:
isotopes
Explanation:
because all of them have the same proton number which is the atom of the same element
PLEASE HELP!! ILL MARK BRAINLYEST!!
New substances are produced in a chemical change.
True
False
Four forces are exerted on an object as shown below: A square is shown with an arrow pointing up labeled 3 N, an arrow pointing right labeled 2 N, an arrow pointing down labeled 4 N and an arrow pointing left labeled 2 N In which direction will the object move? Up Down Left Right
Answer:— A square labeled Object B is shown with an arrow pointing up labeled 3 N, an arrow pointing right labeled 2 N, an arrow pointing down labeled 3 N and an arrow pointing left labeled 1 N. In which direction will the objects move? Object A will move down and Object B will move up.
Explanation:
Answer:
The answer is down.
Explanation:
The forces on the left and right sides are balanced forces making the object not move in left or right directions. The force on the object is also shown to be 4N down and 3N up. The object will move toward the side with more force and that is down.
When a car turns sharply to the right, objects in the back seat move to the left. Why?
Answer:
Newtons third law of motion
Explanation:
For each action, there is an equal and opposite reaction.
A 20 kg fish swimming at 2 m/s swallows a 5 kg fish at rest. What is the speed of the large fish after lunch
Answer:
1.6m/s
Explanation:
Given parameters:
Mass of the big fish = 20kg
Mass of small fish = 5kg
Speed of big fish = 2m/s
Speed of small fish = 0m/s
Unknown:
Speed of the large fish after lunch = ?
Solution:
The momentum of the big fish before and after feeding is conserved.
Initial momentum = Final momentum
m₁v₁ + m₂v₂ = v (m₁ + m₂)
m₁ is mass of the big fish
v₁ is the speed of the big fish
m₂ is mass of the small fish
v₂ is the speed of the big fish
v is the final speed
Now insert the parameters and solve;
20 x 2 + 5(0) = v(20 + 5)
40 = 25v
v = [tex]\frac{40}{25}[/tex] = 1.6m/s
6. What is fuel needed for in space?
7. Could a rocket traveling at a speed of
10,000 km/h get into space? Explain.
8. Why is thrust also known as the
reaction force?
9. Why does a rocket not need to burn
fuel to keep moving once it is in space?
6. fuel is needed in space to power certain things like engines.
7. It couldn't, as the lowest speed acceptable to get into space is 7.9 km per second (28,440 km per hour). This is because to break into the barrier that no longer contains oxygen, you would need to be going at an extremely fast rate.
8. It involves Newton's 3rd law. The movement requires that same thrust to be thrown back, also.
9. There is no gravity. So, basically, you just float.
which is the larger value 5 * 10^5 or 3* 10^7
Explanation:
5x 10^5= 500,000
3x 10^7= 30,000,000
so the second one
The second is a flexible _________.
Answer:
static stretching
Explanation:
hope this helped ^^
Which of the following is the equation for calculating daily caloric needs? A. BMR calories + Digestion calories B. BMR calories + Activity Level calories + Digestion calories C. BMI + Activity Level calories D. Activity Level calories + Digestion Calories
Explanation:
To determine your total daily calorie needs, multiply your BMR by the appropriate activity factor, as follows: If you are sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2. If you are lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375.
HAPPY TO HELP
Energy is measured in form of calories.
What is energy?Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
To determine your total daily calorie needs, multiply your BMR by the appropriate activity factor, as follows:
If you are sedentary (little or no exercise) :
Calorie-Calculation = BMR x 1.2.
If you are lightly active (light exercise/sports 1-3 days/week) :
Calorie-Calculation = BMR x 1.375
Energy is measured in form of calories.
To learn more about energy refer to the link:
brainly.com/question/1932868
#SPJ2
What is an example of Newton's First Law of Motion?
Which pair correctly identifies the strongest and weakest fundamental forces,
with the strongest force listed first?
O A. Strong nuclear force
Weak nuclear force
B. Strong nuclear force
Gravity
O C. Electromagnetic force
Strong nuclear force
D. Gravity
Strong nuclear force
Answer: Option B.
Strong nuclear force Gravity.
Explanation:
Nuclear force is the strongest force while Gravity is the weakest force. Strong nuclear force is the strongest force because it's act and hold atoms of matter together. It also binds neutrons and protons together to form atomic nuclei and it's has strength of 1.
Gravity is considered the weak force out of the four fundamental forces because it has a very small strength of 10^40 than electromagnetic force.
in which sample of water do the water particles have more energy: 5g of ice cubes at -10 OC, or 5 g of liquid water at 20 0C? Explain
A 62Kg rock climber is attached to a rope that is allowing him to hang horizontally with his feet against the wall. The tension of the rope is 7.1x10^2 N, and the rope makes an angle of 32 degrees with the horizontal. Determine the force exerted by the wall on the climber's feet? I need some help with understanding the problem through a FBD as well as how I will find the x and y components. Thank You !
Answer:
R= 602 .11 N
Explanation:
The horizontal component of tension T will give reaction of the wall and the vertical component of T will balance the weight of of the climber .
T cos32 = R
710 x .848 = R
R= 602 .11 N .
How far(in meters) will you travel in 3 minutes running at a rate of 6 m/s
Answer:
1080 meters is the answer
Ana vive a 3 km del instituto y María en la misma carretera, 500 m. Más lejos. Todas las mañanas, a las ocho y cuarto, cogen la bici para ir a clase. Ana pedalea a 6 m/s y María a 8 m/s. A) ¿Cuándo y dónde se encuentran? B) A que velocidad tendría que pedalear Ana como mínimo para que María no la alcanzase antes de llegar al instituto
Answer:
A) Ana y María e encuentran a las 8 hs 19 minutos 10 segundos (250 segundos después).
María y Ana se encuentran cuando aún faltan 1500 metros para llega al instituto.
B) Ana tendría que pedalear como mínimo para que María no la alcanzase antes de llegar al instituto a una velocidad de 6.857 [tex]\frac{m}{s}[/tex].
Explanation:
A) Un movimiento es rectilíneo cuando un objeto describe una trayectoria recta, y es uniforme cuando su velocidad es constante en el tiempo. En otras palabras, el Movimiento Rectilíneo Uniforme es una trayectoria recta, su velocidad es constante y su aceleración es nula.
Para una posición inicial x0 y una velocidad v que tiene el cuerpo a lo largo del movimiento, la posición para cualquier tiempo está dada por:
x(t)= x0 + v*t
Estableciendo el origen de referencia en el instituto, se tienen los siguientes valores:
x0ana= 3 km= 3000 mx0maria= 3500 mPor otro lado, Ana pedalea a 6 m/s y María a 8 m/s.
Entonces, como Ana y María se acercan al origen de referencia, la escuela, se la ecuación del movimiento para cada una de ellas es:
xana= 3000 - 6*txmaria= 3500 - 8*tAmbas se encuentra cuando la posición de ellas sea la misma, esto es xana=xmaria. Entonces:
3000 -6*t= 3500 - 8*t
Resolviendo:
-6*t + 8*t= 3500 - 3000
2*t= 500
t= 500÷2
t=250 s= 4 minutos 10 segundos
Ana y María se encuentran a las 8 hs 19 minutos 10 segundos (250 segundos después).
Para conocer la posición en la que se encuentran debes sustituir el tiempo en la ecuación del movimiento de alguna de ellas:
xana=3000 - 6*250
xana= 1500 m
Es decir, María y Ana se encuentran cuando aún faltan 1500 metros para llega al instituto.
B) Para que esto ocurra Ana y María deben llegar al instituto al mismo tiempo. Entonces, el tiempo que tarda María en llegar a al origen de referencia, la escuela, es:
0= 3500 - 8*t
Resolviendo:
3500=8*t
3500÷8= t
437.5 segundos= t
Así que, si Ana 437.5 segundos o menos, María no la alcanzaría. Siendo la velocidad la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello, entonces la velocidad de Ana se calcula como:
[tex]velocidad=\frac{distancia}{tiempo}[/tex]
[tex]velocidad=\frac{3000 metros}{437.5 segundos}[/tex]
velocidad= 6.857 [tex]\frac{m}{s}[/tex]
Ana tendría que pedalear como mínimo para que María no la alcanzase antes de llegar al instituto a una velocidad de 6.857 [tex]\frac{m}{s}[/tex].
A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below. If the plane is traveling horizontally with a speed of 250 km/h (69.4m/s), (a) how far in advance of the recipients ( horizontal distance) must the goods be dropped. (b) Suppose, instead that the plane release the supplies a horizontal distance of 425m in advance of the mountain climbers. What vertical velocity (up or down) should the supplies be given so that they arrive precisely at the climber's position? (c) with what speed do the supplies land in the latter case
Answer:
Explanation:
For vertical displacement of food-supply
if time taken to reach the ground be t
235 = 1/2 g t² , initial velocity downwards is zero.
t = 6.92 s
Horizontal displacement of food during this period
= 6.92 x 69.4 m
= 480.25 m .
b )
time required to cover horizontal distance of 425 m
= 425 / 69.4 = 6.124 s
This time period will be the time of vertical fall of 235 m . Let initial vertical velocity required be u
h = ut + 1/2 gt²
235 = u x 6.124 + .5 x 9.8 x 6.124²
235 = u x 6.124 + 183.76
u = 8.36 m /s
c )
v = u + gt
= 8.36 + 9.8 x 6.124
= 68.37 m /s
This will be vertical component of velocity .
horizontal velocity = 69.4 m /s
resultant velocity = √ ( 68.37² + 69.4²)
= √(4674.45 +4816.36)
= 97.42 m /s
what is the weight of a 75 kg sack of flour on Earth
We have that the weight of a 75 kg sack of flour on Earth is
[tex]W=735.75N[/tex]
From the Question we are told that
Mass =75kg
Generally
The Gravitational pull on earth is approximately
g=9.81
Generally the equation for Weight is mathematically given as
[tex]W=Mass * gravity[/tex]
[tex]W=735.75N[/tex]
For more information on this visit
https://brainly.com/question/10069252
1. Which has more kinetic energy, a 40 kg cheetah running at 25 m/s or a 4,000 kg elephant moving at 2 m/s? How much more energy does it have?
2. At what speed would the animal with less KE have to travel to have the same kinetic energy as the animal with more KE?
3. Discuss the kinetic and potential energy of the ball on the end of a pendulum as it swings from point A to point B. Explain the kinetic energy and potential energy of the ball at each point and what happens to energy as the ball moves from point A to point B. In your discussion, answer the following questions: When is the kinetic energy of the ball zero and when is it at its highest? When is its potential energy at its lowest and at its highest? What happens to the kinetic energy and potential energy between point A and point B?
Answer:
1. The elephant has more kinetic energy at this speed and mass. It has 4,500 J more KE.
2. The elephant would have to go at a speed of 2.5 m/s to reach the same KE as the cheetah.
Explanation:
You would use the formula KE=1/2mv^2.
This formula would be filled in and completed twice, once for the elephant and once for the cheetah.
Cheetah:
KE = 1/2 (40) (25) ^2
KE = 12,500 J
Elephant:
KE = 1/2 (4,000) (2) ^2
KE = 8,000 J
This shows that the cheetah has more KE.
Then you would subtract the elephants amount of J from the cheetahs to find the difference.
Difference = 12,500 J - 8,000 J
Difference = 4,500 J
I hoped this helped with the first part :)
For the second part:
To find the speed the elephant would have to run you would fill in and complete the equation once more with different distance results.
KE = 1/2 (4,000) (2.5) ^2
KE= 12,500 J
(1) The kinetic energy of the cheetah is 12,500 J while kinetic energy of the elephant is 8,000 J
(2) The speed that the animal with lowest kinetic energy need to match up with the animal with highest kinetic energy is 2.5 m/s.
(3) At the highest point, the kinetic energy of the ball is zero while the potential energy will be maximum.
At the lowest point, the kinetic energy of the ball will be maximum while potential energy will be zero.
The kinetic of object, is the energy possessed by the object due to its motion.
The kinetic energy of the cheetah is calculated as;
K.E = ¹/₂mv²
K.E = ¹/₂ x 40 x 25²
K.E = 12,500 J
The kinetic energy of the elephant is calculated as;
K.E = ¹/₂ x 4000 x 2²
K.E = 8,000 J
(2) The speed of the animal with less kinetic energy to match up with the animal with higher kinetic energy;
12,500 = ¹/₂ x 4000 x v²
25,000 = 4000v²
[tex]v^2 = \frac{25,000}{4000} \\\\v^2 = 6.25\\\\v= \sqrt{6.25} \\\\v = 2.5 \ m/s[/tex]
(3) In a simple pendulum motion, point A (initial position) is the lowest point while point B (final position) is the highest point in the motion path.
At the highest point, the velocity of the ball is zero and the ball will have zero kinetic energy while the potential energy which increases with height will be maximum.
At the lowest point, the velocity of the ball will be maximum and the ball will have maximum kinetic energy while potential energy will be zero since the height is zero.
Learn more here:https://brainly.com/question/14524574
When the cornea and lens of the eye do not properly focus
light onto the retina, corrective lenses are needed. When are concave lenses
appropriate for vision correction?
Answer:
When there is nearsightedness or myopia
Explanation:
As, in myopia the image is formed in front of the retina.
Which makes things looking at things near very easy, but looking at far away things very difficult.
So concave lens makes things look bigger, so therefore, it is used during myopia, to make things look bigger when they are far away