Answer:
2.5 m/s
Explanation:
The total momentum before and after the collision must be conserved.
Before the collision, the total momentum is just given by Junior's momentum, since Ben is at rest. So,
[tex]p_i = m_J u_J[/tex]
where
[tex]m_J = 25 kg[/tex] is Junior's mass
[tex]u_J = 8 m/s[/tex] is the Junior's initial velocity
So we find
[tex]p_i = (25 kg)(8 m/s)=200 kg m/s[/tex]
The final momentum will be equal to the initial momentum:
[tex]p_f = p_i[/tex]
and it can be written as
[tex]p_f = (m_B + m_J) v[/tex]
where
[tex]m_B = 55 kg[/tex] is Ben's mass
v is their final velocity
Solving for v,
[tex]v=\frac{p_f}{m_B + m_J}=\frac{200 kg m/s}{55 kg + 25 kg}=2.5 m/s[/tex]
Devon has several toy car bodies and motors. The motors have the same mass, but they provide different amounts of force, as shown in this table.
The bodies have the masses shown in this table.
Which motor and body should Devon use to build the car with the greatest acceleration?
motor 1, with body 1
motor 1, with body 2
motor 2, with body 1
motor 2, with body 2
Answer:
pretty sure its motor 2, with body 1
Explanation:
To build a car with the greatest acceleration, choose motor 2 and body 1.
How to calculate the acceleration of the car?To find the car with the greatest acceleration, Devon should consider both the motor force and the body mass.
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
In this case, if Devon wants the greatest acceleration, he should choose motor 2 with body 1. Motor 2 provides the most force, and body 1 has the smallest mass.
This combination will result in the greatest net force and therefore the greatest acceleration.
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Which of the following are major problems with fission reactors?
1.Maintaining high temperatures
2.Disposal of hot water
3.Disposing of radioactive waste
4.Obtaining fuel
Answer:
The correct answer is C: Disposal of radioactive waste.
Explanation:
During nuclear fission reactions, many intermediate radioisotopes are produced. For example, uranium releases different mass distribution isotopes and these isotopes emit radiations.
Most harmful isotopes for the environment are strontium and cesium because these have half-lives and an inclination of mixing in food chains.
When radioactive wastes are removed from nuclear reactors they flow towards the swimming pool and also have the tendency to isolate the short-lived isotopes from the environment.
Therefore, radioactive waste disposal has always remained a major problem
Answer:
The third one is the correct answer:)
Explanation:
find the average speed of a car that goes 80 miles in 3 hours.
Answer:
average speed = 80/3 miles per hour (exactly)
average speed = 26.7 mph (approximately)
Explanation:
average speed = distance/time
average speed = (80 miles)/(3 hours)
average speed = 80/3 miles per hour (exactly)
average speed = 26.7 mph (approximately)
Explanation:
80/3 mph is the average speed
Use the right-hand rule for magnetic force to determine the charge on the moving particle. This is a charge.
Answer:
Use the right-hand rule for magnetic force to determine the charge on the moving particle.
This is a
negative
charge
Explanation:
Answer:
The answer is negative
Explanation:
Which of the following should not be included in a great summary?
A. Blaming your lab partner
B. New questions your experiment has generated
C. Your prediction
D. Your investigation plan
Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past
Answer:
light is refracted towards the normal.
Explanation:
The more dense medium have a higher refractive index and so the light slows down towards the normal.
The answer is the index of refraction of the second medium is lower.
Football helmets are made with padding that helps reduce head injuries when a player collides with an object. Which best explains how the padding reduces injuries? It extends the time of the collision. It reduces the time of the collision. It eliminates the reaction force of the object. It eliminates the action force of the object.
Answer:
It eliminates the reaction force of the object.
Explanation:
It eliminates the reaction force of the object by dissipating the energy on the compression of the padding material and distributing the force of impact over the large surface area. As less area would generate more stress by the force.
We know by the equation:
[tex]\sigma=\frac{F}{A}[/tex]
where F & A are force and area respectively.
Also the compression of material absorbs energy in the form of elastic potential energy given by the equation:
[tex]KE=\frac{1}{2} k.\Delta x^2[/tex]
where:
k= elastic constant
[tex]\Delta x[/tex]= change in the dimension of the elastic materiel
Answer:
it´s C
Explanation:
How much energy goes toward kinetic energy?
A famous motorcycle company has just built its first electric
model. Like all vehicles, the purpose of the motorcycle is to
put out kinetic energy
O
50 J
200 J
400
800
O
Electric
energy
800 J
Kinetic
energy
? J
Heat
200 J
Friction
200 J
Answer:
(c) 400j
Explanation:
The amount of energy dedicated to kinetic energy will be 400 J.Option C is correct.
What is Kinetic energy?The energy possessed by the body by the virtue of motion is known as kinetic energy. It is found as the product of mass and the square of the velocity.
Part of the energy in each machine that exists dissipates to the medium in the form of heat, friction with the surface, and other forms of energy dissipation.
If the entire kinetic energy loses 200 J in the form of heat and 200 J in the form of friction this quantity of energy has been wasted and cannot be utilized as kinetic energy.
The energy goes toward kinetic energy will be ;
Kinetic energy = Electric energy -Heat-friction
Kinetic energy = 800-200-200
Kinetic energy =400 J
Hence, the amount of energy dedicated to kinetic energy will be 400 J.Option C is correct.
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How much heat is released to freeze 47.30 grams of copper at its freezing point of 1,085°C? The latent heat of fusion of copper is 205.0 J/g.
Answer:
=9696.5J
Explanation:
The latent heat of fusion of a unit mass of copper is the heat released when it changes from its molten state to solid state of the heat absorbed to melt it.
The total energy released is calculated using MLf where M is the mass of the copper and Lf is the latent heat of fusion.
=mLf
=47.30 grams×205.0J/g
=9696.5J
Answer:
-9697
Explanation:
thats the answer
What color would an object that reflects green and blue light appear to be in white light?
a. blue
b. cyan
c. magenta
d. black
The answer is B. cyan.
If an object reflects green and blue light we preceive the reflection not as separate colours but a mixture of both aka cyan.
Hope this helps.
r3t40
The color appears as cyan when an object reflects green and blue light.
Answer: A
Explanation
The light that is visible to the eye is a form of electromagnetic energy.
White light consists of the electromagnetic spectrum combined by lights of various wavelengths.
Each individual light in this white light has distinct frequency and wavelength.
The clouts observed is due to the reflection of light consisting of three colors- red, blue and green known as primary additive colors of light.
When blue and green combine, primary subtractive color forms, cyan.
Need help ASAP ????????
Answer:
Question 1 is true, question 2 is b
A generator derives electric energy from _____ energy.
From mechanical energy.
Answer:mechanical energy.
GUESS WHAT??? I'LL MAKE YOU BRAINLIEST!!!!
A tilt in the earth’s axis causes _________.
A) sunlight to strike at different angles
B) sunlight to strike at the same angle
C) sunlight to remain constant
D) sunlight to leave causing night
Answer:
A) sunlight to strike at different angles
Explanation:
A tilt in the earth’s axis causes sunlight to strike at different angles.
Answer:
A) sunlight to strike at different angles
Explanation:
Picture the sun's rays hitting Earth.
Here is proof that my answer is correct:
The SI unit that is used to measure time is the
Answer:second
Explanation:
Answer:
The SI unit that is used to measure time is the 'second'.
Explanation:
The International System of Units has defined seven units of measure which are considered as a basic set from which all other SI units can be derived.
Hence, the base unit defined to measure the time is second. It is defined by the oscillations of the radiation which correspond to the transition between two levels of the caesium atom.
The denser a substance, the more tightly packed it is. The table below shows the volume and mass of two different substances. Comparison of Substances Substance Volume (cm3) Mass (g) R 22 10 S 55 25 Which of the two substances is more tightly packed? Object R is more tightly packed. Object S is more tightly packed. Both objects are packed equally tightly. This cannot be determined.
Answer:
Both objects are packed equally tightly.
Explanation:
For Substance R we have
mass = 10 g
Volume = 22 cubic cm
So we know that density is defined as
[tex]\rho = \frac{m}{V}[/tex]
here we have
[tex]\rho = \frac{10 g}{22 cm^3}[/tex]
[tex]\rho = 0.454 g/cm^3[/tex]
For substance S we have
mass = 25 g
Volume = 55 cubic cm
So we know that density is defined as
[tex]\rho = \frac{m}{V}[/tex]
here we have
[tex]\rho = \frac{25 g}{55 cm^3}[/tex]
[tex]\rho = 0.454 g/cm^3[/tex]
So here both have same density
so correct answer would be
Both objects are packed equally tightly.
Answer:
c
Explanation:
choose the more reactive nonmetal. P or O
Oxygen (O) is generally considered the more reactive nonmetal compared to phosphorus (P), due to its higher electronegativity and its strong oxidizing properties.
When comparing the reactivity of phosphorus (P) and oxygen (O), it is important to consider their positions on the periodic table and their chemical properties. Oxygen, which is in the chalcogen group (Group 16), is a highly reactive nonmetal and a strong oxidizing agent that forms compounds with most elements. Being more electronegative, oxygen has a greater tendency to attract electrons, which makes it more reactive than phosphorus in many situations.
Phosphorus is also a very reactive nonmetal, particularly in its white phosphorus form, which can spontaneously inflame in air. However, in reactions with other nonmetals or in the formation of oxides, oxygen's higher electronegativity usually makes it the more reactive element. Therefore, oxygen is considered to be the more reactive nonmetal when compared to phosphorus.
What is the solution to the problem expressed to correct number of significant figures (102,900/12)+(170x1.27)
Answer:
8,790.9
Explanation:
first we start with parentheses so we take (102,900/12) and (170x1.27) and simplify these 102,900/12 would equal 8575, and 170.1.27 would equal 215.9. next we add these together, so (8575)+(215.9), and that would equal our answer which is 8,790.9
To calculate (102,900/12)+(170x1.27) correctly to significant figures, we find that the sum is 119.9 when rounded to the tenths place. It's essential to respect the rules for significant figures, where the precision of the least precise measurement used in the calculation dictates the precision of the final answer.
The solution to the problem (102,900/12)+(170x1.27) needs to be expressed to the correct number of significant figures. When performing calculations with measured values, it's important to consider the precision of the numbers involved. In addition, different operations have different rules for significant figures.
For the calculation provided, first each component needs to be calculated separately:1.)102,900 divided by 12 gives a result which is an integer and thus has an unlimited number of significant figures.2.)170 multiplied by 1.27 equals 215.9, where 170 has three significant figures and 1.27 has three significant figures, so the result should also be reported with three significant figures.
After calculating each component, we then add the two results. The sum must be reported to the lowest place value of the least precise measurement (in this case, the tenths place). This means that the correct final answer, expressed with the appropriate number of significant figures, is 119.9 (assuming the first calculation to be an exact number).
When dealing with the addition of 89.332 and 1.1, since the second number has fewer significant figures after the decimal place, the result should be reported to match that precision. The answer, when rounded to the correct number of significant figures, is 90.4.
Overall, understanding the rules for significant figures is crucial in accurately reporting measurements and results in scientific and mathematical contexts.
The current flowing through the circuit will be ?
[tex]
R_1=20\Omega \\
R_2=30\Omega \\
R_3=30\Omega \\
U=2V \\ \\
R_{12}=\dfrac{1}{R_1}+\dfrac{1}{R_2}=\dfrac{R_1R_2}{R_1+R_2}=15\Omega \\
R_{123}=\dfrac{R_{12}R_3}{R_{12}+R_3}=10\Omega \\
I=\dfrac{U}{R_{123}}=\boxed{0.2A}
[/tex]
Hope this helps.
r3t40
When a pendulum is held high and taut and then is released, the pendulum begins to swing. What’s the correct order of the energy transformations in this example? (PE stands for potential energy.)
Answer:
Pendulum:
A pendulum consists of a mass (known as a bob) attached by a string to a pivot point. As the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.
Energy Transformations:
From Max to Mean Position:
When the bob of the pendulum is held high at one maximum. All the energy of the pendulum is in the form of Potential Energy. The speed of the bob is zero. When released, the bob starts moving downward and as it moves, it gains speed. Here, the Potential Energy of the system is being converted into Kinetic Energy. At the mean position, when the bob is at the minimum height, the potential energy of the system is zero and Kinetic Energy is maximum as the bob is at its maximum speed.
From Mean to Max Position:
Due to Inertia, the bob at the speed v continues its motion and moves towards the other extreme position. And as it do so, the speed decreases and becomes zero at the extreme position. The Kinetic energy converts into Potential Energy,
The motion thus continues.
A graph has been attached for better understanding of the Energy Transformations.
Answer:
Sooo . . . whats the answer
Explanation:
A 70kg skier moving at 5 m/sec down a slope what is the skier’s momentum
Answer:
Momentum of the skier is 350 Kg.m/sec
Explanation:
Momentum of a body can be calculated using the following rule:
P = m * v
where:
P is the momentum of the body
m is the mass of the body given as 70 Kg
v is the velocity of the body given as 5 m/sec
Substitute with the givens in the above rule to get the momentum of the skier as follows:
P = m * v
P = 70 * 5
P = 350 Kg.m/sec
Hope this helps :)
Match the vocabulary terms to their definitions.
Answer:
1: work
2: energy
3: joule
1) The ability to cause change in matter
Energy
2) The product of force and the distance through which it moves
Work
3) metric unit of work and energy equals to one newton times one matter
joule
10. The kinetic theory of matter states that __________.
atomic particles will move if the temperature is above the freezing temperature of water
atomic particles bounce off each other one time in their life
atomic particles are constantly bumping off each other because particles are in direct contact with each other at all times
all matter is made up of atomic particles which are in constant random motion
Answer:
I believe the answer is D- "all matter is made up of atomic particles which are in constant random motion."
Explanation:
Hopes this helps:)
Answer:
all matter is made up of atomic particles which are in constant random motion
Explanation:
Which of the following items uses a wheel and an axle?
a) a bicycle
b) a wheel chair ramp
c) a pair of scissors
d) a shovel
the applied force of 3 washers will increase the applied force on the car to n.
Answer: 0.147
Explanation:
just took it
Answer:
0.147
Explanation:
Because i just did it and got it right :))) your welcome
Allison drew a diagram to illustrate radiation.
Which labels should replace the X and Y?
X: Matter
Y: Empty space
X: Large mass
Y: Small mass
X: Hot
Y: Cold
X: Earth
Y: Sun
Answer:
the answer is C.
Explanation:
radiation goes from hot to cold.
Based on the diagram that was drawn by Allison to illustrate radiation, the labels that should replace the X and Y is hot and cold.
Radiation simply means the emission or the transmission of energy in the form of particles or waves through space.
From the complete question, it should also be known that radiation is the energy that comes from a source and then travels through space at the speed of light. From the diagram that was drawn by Allison to illustrate radiation, the labels that should replace the X and Y is hot and cold.
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A 150 g egg is dropped from 3.0 meters. The egg is
moving at 4.4 m/s right before it hits the ground. The egg
comes to a stop in 0.072 seconds.
What is the magnitude of force that the ground exerted on
the egg?
Answer:
9.2 N, with significant figure rounding (2 s.f.)
Explanation:
This problem can be solved using momentum. The following equation relates momentum (mass & velocity) with force and time:
Note that where v is the final velocity and v₀ is the initial velocity. Δv just means change in velocity.
Mass of the egg is 150 g, but we need to convert to kilograms if we want to use Newtons as a unit. 150 g is equal to 0.15 kg. since 1000 g = 1kg.
m = 0.15 kg
The dropped from 3.0 meters is irrelevant as the question tells us the initial velocity of the egg: 4.4 m/s before it hits the ground.
v₀ = 4.4 m/s [down]
When it comes to a stop, the egg will have a velocity of 0.
v = 0 m/s
The time it takes for the egg to stop is 0.072 seconds.
Δt = 0.072 s
Therefore, if down is positive, then
We round to two significant figures since every quantity has two sig. figs.
We only care about the magnitude, not direction. The answer is 9.2 N.
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5.0
The magnitude of force that the ground exerted on the egg is 9.2N
What is impulse?The change in momentum is equal to the product of impact force applied while colliding and time for that impact.
F. t = m (Vf -Vi)
where, Vf is the final velocity and Vi is the initial velocity.
Given, mass of the egg is 150 g, m = 0.15 kg
The egg is dropped from 3.0 meters and the initial velocity v₀ = 4.4 m/s [down]
When egg strikes the ground, the egg will move with v = 0 m/s
The time taken for the egg to stop is Δt = 0.072 s
Substitute the values into the expression, we get
F x 0.072 = 0.15 x (0 - 4.4)
F = 9.16N
Thus the magnitude of force is 9.2 N.
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which best describes the act of using senses or tools to gather information
Answer:
The act of using senses or tools to gather information is called Observation.
Answer: It is called an observation
Explanation: When we have a phenomenal and we want to gather information about it, we need to "observe" it.
This may be done by using our senses, like looking, smelling, touching, or a more modern approach, using tools, like spectrometers, velocimeter, or the needed tool.
A given feature of a phenomenon that can be measured is called an "observable", and the act of measuring this "observable" is called an "observation"
a satellite is orbiting Earth at a distance of 35 kilometers. The satellite has a mass of 500 kilograms. what is the force between the planet and the satellite
Answer:
The force between the planet and the satellite is 4.76 * 10³ Newtons
Explanation:
Given:
Mass of satellite = m = 500 kg
Distance of the satellite from Earth's surface = h = 35000 m
We know that:
Mass of Earth = M = 5.9 * 10²⁴ kg
Radius of Earth = R = 6.4 * 10⁶ m
Gravitational Constant = G = 6.673 x 10⁻¹¹ N m²/kg²
Force between Earth and an object is given as:
F = GmM/(R+h)²
= (6.673 x 10⁻¹¹ x 500 x 5.9 x 10²⁴)/((6.4 * 10⁶)+(3.5*10⁴))²
= (1.97*10¹⁷)/(6.435*10⁶)²
= (1.97*10¹⁷)/(4.14*10¹³)
= 4.76 * 10³ N
Answer: F = 4.76 * 10³ N
Explanation:
We know that the force of gravity between two objects is:
F = G*m*M/r²
Where M is the mass of earth, m is the mass of the satelite, r is the distance between the radius of the earth and the satelite and G is the gravitational constant, and the data that we have is:
Mass of satellite: m = 500 kg
Distance of the satellite from Earth's surface: H = 0.035x10^6 m
Radius of Earth: R = 6.4 x 10⁶ m
So we have that r = R + H = 6.435x10^6
Mass of Earth: M = 5.9 * 10²⁴ kg
Gravitational Constant: G = 6.673 x 10⁻¹¹ N m²/kg²
Then the force that the Earth does in the satellite is:
F = (1.97*10¹⁷)/(6.435*10⁶)²
F = (1.97*10¹⁷)/(4.14*10¹³)
F = 4.76 * 10³ N
Will mark brainlist
A line has a slope of 5 and a y-intercept of 0 Which is the equation of the line?
Answer:
y=5x
Explanation:
it would be y=5x because in slope intercept form, y=mx+b, the "m" equals the slope, so when it says that the slope is 5, you plug it in there. And then the b is the y intercept, so because it is 0, you don't put anything down
the momentum of a car travelinv in a straight line at 20 m/s is 24,500kg·m/s. what is the cars mass?
Answer:
Explanation:
V= 20m/s
M= 24,500kg.m/s
M = m x v
m = M/v
m = 24,500/20
m = 1,225kg