Answer:
2 m/s
Explanation:
Conservation of momentum:
momentum after catch = momentum of system before catch
before catch . momentum = 10 kg * 15 m/s = 150 kg-m/s
after catch m = 65 + 10 = 75 kg
75 kg * v = 150 kg-m/s
v = 2 m/s
What is the minimum value that the index of refraction can have?.
The woman pushes on the door. If her force is the action force, which of these describes the reaction force?
A. The door pushes back on her hand
B. The door pushes forward
C. The door pushes against the wall
D. The door is pulled downward by gravity
Answer:
Option A
Explanation:
since the woman pushed on the door, the door pushes back on the girl's hand since every action has an equal and opposite reaction.
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Bandura found that children who witnessed aggressive behavior being punished were far more likely to be aggressive than children who did not. please select the best answer from the choices provided t f
The given statement ''Bandura found that children who witnessed aggressive behavior being punished were far more likely to be aggressive than children who did not'' is false because
Bandura found that children who witnessed aggressive behavior being rewarded or not punished were more likely to be aggressive than children who did not witness such behavior. This is known as the social learning theory.
In Bandura's famous Bobo doll experiment, children were divided into three groups one group witnessed an adult model behaving aggressively towards a Bobo doll, another group witnessed a non-aggressive adult model playing with other toys, and the third group did not witness any adult model.
The results showed that children who witnessed the aggressive behavior being punished were less likely to imitate the behavior, while those who witnessed the aggressive behavior being rewarded or not punished were more likely to imitate the behavior. This suggests that children learn through observation and modeling, and that consequences play an important role in shaping behavior.
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Johanna is studying what happens to the energy as a ball rolls down a ramp. what is she studying? select three options. gravitational potential energy electrical energy kinetic energy mechanical energy elastic potential energy
Answer:
a c d the correct ....
Explanation:
...........
distinguish between refraction,reflection and total internal reflection
Refraction, reflection, and total internal reflection are distinct optical phenomena. They involve the bending, bouncing, and complete reflection of light, respectively. These phenomena have practical applications and contribute to our understanding of light behavior and optical devices.
Refraction, reflection, and total internal reflection are fundamental phenomena associated with the behavior of light when it interacts with different mediums or interfaces. Let's explore each of these concepts and understand their distinctions:
1. Refraction:
Refraction refers to the bending of light as it passes from one medium to another with a different optical density. When light encounters a change in medium, its speed and direction change, causing the light ray to deviate. This deviation occurs because light travels at different speeds in different materials. The amount of bending depends on the angle of incidence and the refractive indices of the two mediums involved. Snell's law governs the mathematical relationship between the angles of incidence and refraction. Refraction is responsible for various optical phenomena, such as the bending of light in lenses and the dispersion of white light into its constituent colors in a prism.
2. Reflection:
Reflection occurs when light encounters a boundary between two mediums and bounces back into the same medium from which it originated. The angle of incidence is equal to the angle of reflection, according to the law of reflection. Reflection plays a fundamental role in our ability to see objects, as light rays reflected from surfaces enter our eyes. Mirrors and other reflective surfaces exploit the principle of reflection.
3. Total Internal Reflection:
Total internal reflection occurs when light travels from a medium with a higher refractive index to a medium with a lower refractive index, and the angle of incidence exceeds a critical angle. In such cases, instead of bending or refracting, the light is completely reflected back into the denser medium. Total internal reflection is responsible for various phenomena, including the shiny appearance of diamonds and the working of optical fibers. It enables light to propagate through the fiber by repeated internal reflections.
In conclusion, refraction, reflection, and total internal reflection are distinct optical phenomena. Refraction involves the bending of light when it transitions between different mediums, reflection refers to the bouncing back of light from a surface, and total internal reflection occurs when light is reflected back into a denser medium at an angle greater than the critical angle. These phenomena have practical applications and contribute to our understanding of light behavior and the functioning of various optical devices.
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Why does a curve on a distance-time graph indicate acceleration?
An increasing amount of time passes for each unit of distance.
A decreasing distance is traveled during each unit of time.
A decreasing amount of time indicates a decreasing number of distance units.
An increasing distance is traveled during each unit of time.
Answer:
an increasing distance is traveled during each unit of time.
Explanation:
since the distance is constantly increasing over the same period of time we can say that it is acceleration.
A cube of wood 20 cm on each side is placed in a tub of water and is found to sink so that only 6 cm of the block is above the water. What is the density of the wood
The density of the cube of wood placed in the tub of water is determined as 700 kg/m³.
Specific gravity of the woodThe specific gravity of the wood is the fraction of the entire wood volume below water surface.
Height below water surface = 20 cm - 6 cm = 14 cm
S.G = 14 cm/20 cm
S.G = 0.7
Density of the woodThe density of the wood is calculated with respect to density of water.
S.G = ( density of wood) / (density of water)
0.7 = (density of wood) / (1000 kg/m³)
density of wood = 0.7 x 1000 kg/m³
density of wood = 700 kg/m³
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Suppose a vehicle begins at rest at t=0 and accelerates at a rate given by the equation a(t) = (15 m/s^) t . Assume nonuniform acceleration.
Find the velocity a 3 seconds.
Find the displacement at 3 seconds.
Must show work.
Answer:
See below
Explanation:
Since it is non-uniform acceleration ( it varies with time as given)
The integral of acceleration is velocity
so integrate between 0 and three 15 m/s^2 t
= 1/2 ( 15 t^2 ) + k between 0 and 3 ( k is a constant we will ignore)
= 67.5 - 0 = 67.5 m/s velocity
the integral of velocity is displacement
1/2 (15t^2 ) integrated becomes 1/6 15 t^3 from 0 to 3 ( ignoring a constant again)
1/6 * 15 * (3^3 ) = 67.5 meters displacement
THANX for those who noted my errors in my first posted response !!
Calculate the kinetic energy in joules of a ball of mass 40g moving at a velocity of 4 metres per second
If the activity of a radionuclide decreases from 5,000 disintegrations per minute to 625 disintegrations per minute
in 12 hours, its half-life is?
Answer:
4 hrs
Explanation:
625 = 5000 (1/2)^n
625/5000 = 1/2^n
n = 3 half lives
3 half lives = 12 hours 1 half life = 4 hrs
Calculate the pressure when a force of 200N acts on an area of 0.05cm2
.
FORCE ACTING ON THE BODY , F = 200N
AREA ON WHICH THE FORCE IS ACTING , A = 0.05 CM²
= 0.05*(10⁻²)
= 0.05*10⁻² M²
TO CONVERT CM TO M * BY 10⁻²
PRESSURE = FORCE / AREA
PRESSURE = 200/0.05*10⁻⁴
= 200*10⁴/0.05
= 200*10⁴*10²/5
= 20*10⁵/5
= 4*10⁵ N/M².
HOPE THIS HELPS.
A sound wave is produced and begins to travel from left to right through four different media. The speed of the wave varies as it travels. The media are solid, liquid, gas, and a vacuum, but not necessarily in that order. Which speed MOST likely represents a gas
The speed most likely representing a gas will be 334 m/sec. A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.
What is a sound wave?When an object vibrates, a pressure wave is created, which produces sound. The particles in the surrounding medium (air, water, or solid) vibrate as a result of the pressure wave.
The vibrations of the particles move nearby particles, allowing the sound to travel further through the medium.
Hence, the speed most likely representing a gas will be 334 m/sec.
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A bucket of water with weight of 50N is pulled up using a rope. The bucket is moving at
a constant velocity, what is the tension in the rope?
A: 25N
B: 0.0N
C: 100N
D: 50N
The side length of a square is modeled by s=A, where A is the area of the square. Graph the function. What is the side length of a square with an area of 35 square units?
Answer:
√35 square units
Explanation:
Area of square = 35square units
Formula of area of square is a =s*s where a is area and s is side
So,
s*s = 35
s^2= 35
s = √35
tell me if this is the answer u r looking for
The formula for the area of square is (side)² and to find the dimension or side length of the square with an area of 35 square units is √35 units.
What is the area of square?
Area is defined as the total space which is covered by a flat (2 dimensional) surface or shape of an object. The space that is covered up on the paper is called its Area. The area of a shape is the number of unit squares that is required to completely cover it. Therefore, it is measured in square units such as m² or cm².
The formula for area of a square = (side)² = side × side
Area of square = 35 square units
35 square units = (side)²
Side = √35
Side = 5.91 units
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Which of the following statements is TRUE about the transfer of energy from the sun to
the land and to the air?
A.Sunlight transfers energy from the sun to the air and from the sun to the land, but the land does
not transfer energy to the air
B.Sunlight transfers energy from the sun to the air, but sunlight does not transfer energy from the
sun to the land and the land does not transfer energy to the air
C.Sunlight transfers energy from the sun to the land and from the sun to the air, and the land
transfers energy to the air
D.Sunlight transfers energy from the sun to the land, but sunlight does not transfer energy to the
air and land does not transfer energy to the air
Answer:
C is the correct answer I believe
Explanation:
Without the Sun , Earth's land, water, and air would all be frozen. Energy is transferred from the sun to Earth via electromagnetic waves, or radiation
Energy is transferred between the Earth's surface and the atmosphere in a variety of ways, including radiation, conduction, and convection.
A 40kg cart gains a KE of 200J. How fast does it go?
Answer:
3.16 m/s
Explanation:
Use the formula
[tex]k = \frac{m {v}^{2} }{2} \\ v = \sqrt{ \frac{2k}{m} } \\ v = \sqrt{ \frac{2(200)}{40} } \\ v = 3.16 \frac{m}{s} [/tex]
Which of these statements is true about severe weather?
Severe weather does not cause enough injuries to take precautions.
Weather situations can be prepared for in many cases,
Severe weather can be avoided in certain areas of the country.
Preparation is impossible for extreme weather situations.
Answer:
Weather situations can be prepared for in many cases,
Explanation:
4. What evidence do scientists have that lead them to believe there is a black hole at the center of the milky way?
A) they have directly measured the gravity of the black hole.
B) they have observed the very rapid orbits of stars close to the area.
C) they have observed comets and asteroids disappearing into the area.
D) they have sent a probe into the area and it did not return.
5. About how much of the mass of the Milky way has yet to be discovered by scientists?
A) 95%
B) 70%
C) 20%
D) 5%
4. B They have observed the very rapid orbits of stars close to the area.
5. A. 95%
im doing the test right now
PLEASE HELP ME
A/An _____ is a material in which charges will not move easily, whereas a/an _____ is a material that allows charges to move about easily. Question 3 options: conductor, insulator insulator, conductor electroscope, conductor insulator, electroscope
Answer:
The answer is Insulator, Conductor
Explanation:
A/An Insulator is a material in which charges will not move easily, whereas a/an Conductor is a material that allows charges to move about easily
At first, right after the Big Bang, the universe was too hot for nuclei and electrons to combine into the kinds of neutral atoms that are familiar to us today. How soon after the beginning did it become cool enough for neutral atoms to form
After the Big Bang, it took the universe 3 minutes to become cool enough for neutral atoms to form.
Time taken for the universe to cool after the Big Bang
During the first moment, immediately after the Big Bang, the universe was too hot for nuclei and electrons to combine into the kinds of neutral atoms that are familiar to us today.
In the first three minutes after the Big Bang, these protons and neutrons began fusing together, forming deuterium also known as heavy hydrogen.
Thus, after the Big Bang, it took the universe 3 minutes to become cool enough for neutral atoms to form.
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From this information, Jasmine concludes that "fertilizer b" is the best at increasing crop yields. Is Jasmine's conclusion scientifically valid? A. Yes, because "fertilizer b" increased her crop yield. B. No, because the different sections of her land were not equal in area. C. No, because the different sections of her land have different characteristics. D. No, because the crop yields were all equal.
Answer:
c
Explanation:
i just did this study island and the answer was wrong
Complete the following sentence. The World Wide Web launched to the public in.
HURRY 1 MINUTE LEFT
Answer:
January 1st, 2000
Explanation:
I hope this has helped you!
A battery supplies ________ to the circuit.
A. Voltage
B. Current
C. Resistance
D. Ohms
Answer:
current
.
.
.....is the correct answer
Answer:
voltage
Explanation:
When a -3.72*10^-4 C charge
moves from point A to point B, its
electric potential energy increases
by 0.218 J. What is the potential
difference between A and B?
Include the correct sign, + or - .
The potential difference between A and B is -586.02 V, when the potential energy increases by 0.218 J.
Potential difference between A and BThe potential difference between A and B is determined as follows;
W = qΔV
where;
W is the work done q is the chargeΔV is the potential differenceThe potential difference between A and B is calculated as follows;
ΔV = W/q
(U = -W) and U = 0.218 J
ΔV = -0.218/(3.72 x 10⁻⁴)
ΔV = -586.02 V
Thus, the potential difference between A and B is -586.02 V, when the potential energy increases by 0.218 J.
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Answer:
-586.02
Explanation:
Acellus
You fire a flare gun straight up from point 3.00 above the ground. A 25.00g flare leaves the muzzle at a speed of 225.0 km/h. How high does the flare go relative to the ground?
The height of the flare relative to ground is 202.3 m. This is the sum of height reached by the flare and the 3 m platform above the ground.
Maximum height reached by the flareThe maximum height reached by the flare is determined from the principle of conservation of energy as shown below;
P.E = K.E
mgh = ¹/₂mv²
gh = ¹/₂v²
h = (v²)/(2g)
where;
v is the speed = 225 km/h = 62.5 m/sh = (62.5)²/(2 x 9.8)
h = 199.3 m
Height of the flare relative to groundH = 199.3 + 3
H = 202.3 m
Thus, the height of the flare relative to ground is 202.3 m. This is the sum of height reached by the flare and the 3 m platform above the ground.
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How much work does it take to lift 345 boxes to a height of 6.00 m of each box has a mass of 7.89 kg
Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.
Work doneWork done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;
W = F × d
Where F is force applied or Weight and d is distance
Also Force = Weight = mass × acceleration due to gravity.
Since gravity is acting on the boxes as it been lift
W = Weight × height from ground level
W = mg × d
Where m is mass of the boxes, g is accelration due to gravity( g = 9.8m/s² ) and d is distance from ground level.
Given the data in the question;
Since each box has a mass of 7.89 kgMass of the 345 boxes = 345 × 7.89 kg = 2722.05kgDistance or height d = 6.0mWork done W = ?To determine the work done, we substitute our values into the expression above.
W = mg × d
W = 2722.05kg × 9.8m/s² × 6.0m
W = 160056.5kgm²/s²
W = 160056.5J
W = 1.6 × 10⁵J
Therefore, Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.
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the mass of two balls is 0.80 kg each and they are separated by a distance of 0.25 meters. please calculate the gravitational force between the two balls
Select the best answer.
Which of the following represents a thick layer of solid and
partially melted rock?
Crust
Outer Core
Mantle
Inner Core
Answer:
C. Mantle
Explanation:
The Mantle is a thick layer of solid and partially melted rock
A current of 1.3 A passes through a lamp with a resistance of 5 Ohms. What is the power supplied to the lamp in Watts
Answer:
8.45 w
Explanation:
Power = i^2 r
1.3 ^2 * 5 = 8.45 watts
An object with a mass of 1.5 kg changes its velocity from 15 m/s to 22 m/s during a time interval of 3.5 seconds. what impulse was delivered to the object? 3.0 n • s 11 n • s 25 n • s 56 n • s
Answer:
11 Ns
Explanation:
Formula
Impulse = Force x timeCalculating Force
F = maF = m(v - u / t) [From 1st Law of Motion : v = u + at]F = 1.5(22 - 15 / 3.5)F = 1.5 (7/3.5)F = 1.5 x 2 = 3 NCalculating Impulse
J = F x tJ = 3 x 3.5J = 11.5 Ns ≅ 11 Ns (closest answer)Answer:
is (B) 11 N • s
Explanation:
trust me I got it right