(80kg)(3m/s)+(90)(-2m/s)=60N*s
Answer:
Total momentum of the system before the collision is 60 kg-m/s.
Explanation:
Given that,
Mass of Matt, m = 80 kg
Mass of Trey, m' = 90 kg
Initial speed of the Matt before the collision, u = 3 m/s (east)
Initial speed of the Trey before the collision, u = -2 m/s (west)
After the collision, Matt is moving 1.5 m/s to the west.
We need to find the total momentum of the system before the collision. We know that the momentum is given by the product of mass and velocity. Initial momentum is given by :
[tex]p_i=mu+m'u'\\\\p_i=80\times 3+90\times (-2)\\\\p_i=60\ kg-m/s[/tex]
So, the total momentum of the system before the collision is 60 kg-m/s. Hence, this is the required solution.
What is the energy equivalent of an object with a mass of 23 g
Answer:
0.207x10^16 Joules!
Explanation:
Using Einstein's law of mass energy, we know that the energy of a matter is:
E = mc^2
where, m [kg] = mass
c [m/s] = speed of light
In this case:
m=23g = 0.023kg.
c = 3×10^8m/s (This is an aproximation)
Then:
E = mc^2 = (0.023kg)(3×10^8m/s)^2 = 0.207x10^16 Joules!
What force (in newtons) is required to accelerate a body with a mass of 32 kilograms at a rate of 12 m/s2?
Answer:
384 N
Explanation:
Newton's second law:
∑F = ma
F = (32 kg) (12 m/s²)
F = 384 N
Answer:
F=384 N
Explanation:
F=ma
F = 32 kg × 12 m/s2
F = 384 N
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what are some signs of physical change
Answer:
Common Physical Changes. Texture. Color. Temperature. Shape. Change of State.
Physical Properties. Luster. Malleability. Ability to be drawn into a thin wire. Density. Viscosity.
Common Chemical Changes. Change in Temperature. Change in Color. Noticeable Odor. Formation of a Precipitate.
Explanation:
Physical changes can be reversed usually by heating or cooling a substance, without any chemical bonds being broken.
Chemical changes CANNOT be reversed due too the chemicals being broken and forming something new.
Btw, I know you didn't need chemical change, but I put it in there anyway. Hope it helps.
Answer: if you are talking about the body then increased hormones as physical changes with growing in sexual parts and for guys increase in with muscles and growing in breast.
If it was of a change in physical properties. as of natural in universe then it would be melting, transition to different states of matter.
Explanation:
When everyone gets of age they grow and mature and these kind of changes happen
The reason for that would be of the change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density, These are some examples of physicals changes
what is waters characteristics shape due to?
single covalent bonding
polar covalent bonding
ionic bonding
nonpolar covalent bonding
Answer:
In a polar covalent bond, the electrons are unequally shared by the atoms and spend more time close to one atom than the other.
Explanation:
Answer: polar covalent bonding
Explanation:
A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.
Ionic bond is formed when there is complete transfer of electron from one atom to another atom.
Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms.
Water molecules are bonded by strong hydrogen bonding between the hydrogen atom and the electronegative oxygen atom by sharing of electrons and thus form polar covalent bonds.
Question 8 (3 points)
Bob throws a sticky piece of gum at a stationary cardboard box. The gum has a mass of 0.003 kg.
and the box has a mass of 0.05 kg. The gum hits the box with a speed of 9 m/s, and they stick
together and slide forward.
a. What is the total momentum of the system before the collision? (1 point)
b. What is the total momentum of the system after the collision? (1 point)
c. What is the velocity of the gum/box combination after the collision? (1 point)
p=mv
a).p=(0.003kg)(9m/s)+(0.05kg)(0m/s)=0.027kg*m/s
Answer:
a) 0.027 kgm/s
b) 0.027 kgm/s
c) 0.509 m/s
Explanation:
Mass of gum = m1 = 0.003 kg
Mass of box = m2 = 0.05 kg
Velocity of gum before collision = V1 = 9 m/s
Velocity of box before collision = V2 = 0 m/s
a) Momentum of system before collision = m1V1 – m2V2
= (0.003)(9) – (0.05)(0) = 0.027 kgm/s
b)According to law of conservation of momentum,
Momentum of system after collision = Momentum of system before collision
Momentum of system after collision = 0.027 kg/s
c) as the gum and box behaving as a single object so their velocity (V’) will be same.
Momentum of system after collision = (m1 + m2)V’ = 0.027 kg/s
V’ = 0.027/(m1 + m2)
V’ = 0.027/(0.003 + 0.05)
V’ = 0.509 m/s
Which type of electromagnetic waves have longer wavelengths that the waves that make up visible light.
Answer:
radiation
Explanation:
Answer:
radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, gamma rays
Explanation:
Please help!!
30 Points!!!
i only have 1 hour
Answer:
8) inertia
9) mass and velocity
10) electric
11) decreases because gravity decreases
Hello There
Newtons first law of motion is sometimes called the law of "INERTIA"
Momentum depends on "MASS AND VELOCITY"
What force is responsible for the repulsion between two positively charged particles? "ELECTRIC"
An astronaut travels far away from Earth, her weight "DECREASES BECAUSE GRAVITY DECREASES"
Assuming that the acceleration due to gravity is 32.2 ft/s2 and air resistance is negligible, a projectile is launched at 56° above the horizontal with an initial velocity of 36 ft/s. The launch and landing sites are at the same elevation.
What is the projectile’s range?
Answer:
37 ft
Explanation:
First find the air time:
y = y₀ + v₀ᵧ t + ½ gt²
0 = 0 + (36 sin 56°) t + ½ (-32.2) t²
0 = 29.8 t - 16.1 t²
0 = t (28.8 - 16.1 t)
t = 1.85 s
Now find the range:
x = x₀ + v₀ t + ½ at²
x = 0 + (36 cos 56°) (1.85) + ½ (0) (1.85)²
x = 37.3 ft
Rounded to two sig-figs, the range is 37 feet.
The range of a projectile launched at an angle of 56° above the horizontal with an initial velocity of 36 ft/s, neglecting air resistance and considering that the launch and landing sites are at the same elevation, is approximately 129.17 ft.
Explanation:In Physics, the range of a projectile launched at an angle can be calculated with the following equation: Range = (v² sin 2θ )/ g where v is the initial velocity, θ is the launch angle, and g is the acceleration due to gravity.
In this case, v = 36 ft/s, θ = 56°, and g = 32.2 ft/s². Converting the angle from degrees to radians gives us θ = 56° × π/180 = 0.977 radians.
Plugging in the values and using the sine of double the angle, we have: Range = (36 ft/s)^2 sin(2 * 0.977 rad) / 32.2 ft/s² = 129.17 ft.
So, the range of the projectile, assuming negligible air resistance and the launch and landing sites are at the same elevation, is approximately 129.17 ft.
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how are electromagnets and bar magnets alike and how are they different ?
An electromagnet is made from a coil of wire which acts as amagnet when an electric current passes through it. Often anelectromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil.
Electromagnets and bar magnets have similar characteristics with north and south poles, but differ in that electromagnets need a power supply while bar magnets are permanent.
Electromagnets and bar magnets share similarities such as having north and south poles that attract and repel each other. They both produce a magnetic field around them.
However, electromagnets require an external power supply to generate a magnetic field, while bar magnets are permanent magnets that do not need an external power source.
What is the definition of ego?
a person's sense of self-esteem or self-importance.
PSYCHOANALYSIS
the part of the mind that mediates between the conscious and the unconscious and is responsible for reality testing and a sense of personal identity.
Ego is defined as oneself especially contradicted with another self in the world.
Explanation:
The Latin word for ‘I.’ is Ego. Ego is defined as oneself especially as contrasted with another self. Ego is related to meaning to the word conceit.
Some of the synonyms of the word ego are self-respect, pride, self-esteem. Ego is our conscious mind, which has the identity considering the "self." It results in pride feel which makes someone superior to others.
Minerals ____.
A. Can be gases
B. Must be inorganic
C. Can’t be compounds
D. Are the same as rocks
Answer:
Neither. But I guess, if you look at it this way, they make up rocks... so I guess D is probably the most likely answer of those options. Hope this helps.
Explain why a roller coaster’s second hill cannot be taller than the first hill.
The reason behind the second hill in the roller coaster not taller than the first hill is the frictional force acting on the roller coaster.
Explanation:
The height of the first hill in the roller coaster is taller with the decrease in the subsequent hills as the frictional forces reduces the kinetic energy.
Coming down the first tallest hill, the speed and kinetic energy both increases as the motion is in line with gravity, but due to conservation of energy, the potential energy decreases. And as the potential energy decreases, the height of hill has to be decreased in order to complete the motion.
A 2500-ohm is connected to a 110v power supply. What is the current through the resistor
Answer:
0.044 amps
Explanation:
Givens
R = 2500 ohms
E = 110 volts
I = ?
Equation
I = E/R
Solution
I = 110/2500
I = 0.044 amps
How do MRIs physically work?
Answer:
An MRI scanner applies a very strong magnetic field
Explanation:
Magnetic resonance imaging (MRI) uses a superconducting magnet to create a strong magnetic field, causing hydrogen nuclei in the body to emit signals when subjected to a radio frequency current. These signals are interpreted by a computer to form detailed images of internal structures that differentiate between tissue types and provide information about organ function and health conditions.
How Do MRIs Physically Work?
MRI, or magnetic resonance imaging, is a technique that uses a combination of strong magnetic fields and radio waves to generate detailed images of the inside of the body. The largest part of the MRI unit is a superconducting magnet that creates a consistent magnetic field, usually between 1 and 2 Tesla (T) in strength. Within this field, hydrogen nuclei, which are abundantly found within the water in soft tissues, align with the magnetic field.
When a radio frequency current is briefly activated, it creates a varying electromagnetic field that causes these hydrogen protons to absorb energy and move out of their initial aligned position. Upon deactivating the radio frequency field, the hydrogen protons release the absorbed energy and realign with the magnetic field, emitting electromagnetic signals in the process. The emitted signals are picked up by sensors within the MRI machine and subsequently interpreted by a computer to create a highly detailed image that differentiates tissues based on their density and composition.
This process allows medical professionals to gain invaluable information about structures within the body, from the shape of vertebral disks to the condition of brain tissue. The different responses of normal vs. non-normal tissues to slight changes in the magnetic field also provide insights into organ function and the presence of medical conditions such as tumours, strokes, and infections. MRI imaging is a powerful tool that can track ions across membranes, detail anatomical structures, and monitor organ function without exposure to ionizing radiation.
Which direction do we NORMALLY expect our weather to come from in Enfield
Answer:
The direction of where the wind comes from normally in Enfield, Connecticut is from the southeast.
Hope this helps!! :)
In Enfield, we normally expect weather to approach from the west. This is due to the prevailing westerly winds that affect the weather patterns in the United Kingdom. Consequently, weather systems often move in from the Atlantic Ocean, which lies to the west of Enfield and the rest of the UK.
The predominant weather direction in Enfield is influenced by the larger atmospheric circulation patterns, specifically the westerly winds found in the UK's latitudinal zone. These winds are part of the global circulation system and are driven by the Earth's rotation and the temperature contrast between the equator and the poles. As a result, low-pressure systems, which generally bring cloudy and rainy conditions, commonly move from west to east due to these westerly winds. Understanding this pattern is crucial when describing the weather of Enfield at a specific time. Additionally, detailed weather forecasts for Enfield would take into account these prevailing winds and other local factors that might slightly alter this general west to east movement.
Work is a transfer of
Answer:
Energy
Explanation:
Work is the transfer of energy
what is the acceleration of a body moving with a velocity of 30 m/s in a circle of radius 10 m
if the body is moving in a circle, then it moves with a centripetal acceleration and it is given by,
a=v^2/r
where, velocity(v)=30m/s
radius(r)=10 m
so a=30^2/10=90m/s^2
The body that is moving in a circle with a constant velocity of 30 m/s and radius of 10m has a centripetal acceleration of 90 m/s².
Explanation:The student is inquiring about the acceleration of an object moving in a circle, specifically a body moving with a constant velocity in a circular path. This is a question of circular motion in Physics.
The acceleration of a body moving in a circle is called centripetal acceleration. It's directed towards the center of the circle. In Physics, the formula to calculate centripetal acceleration (ac) is:
ac = v^2/r
where:
v is the velocity of the body, andr is the radius of the circle.In this scenario, the body is moving with a velocity (v) of 30 m/s and the radius (r) of the circle is 10 m. Using the above formula, the acceleration would be:
ac = 30^2 / 10 = 900 / 10 = 90 m/s²
The body has a centripetal acceleration of 90 m/s².
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Which result in an increase in power
Answer:
doing more work in less time?
Explanation:
Answer:
more work n less time
Explanation:
A radio wave might have a wavelength as long as a _____
A.) cup
B.) house
C.) puppy
D.) molecule
Answer:
molecule
Explanation:
A rock is projected upward from the surface of the moon, at time t = 0.0 s, w a velocity of 30 m/s. The acceleration due to gravity at the surface of the moon in 1.62 m/s2. What is the maximum height of the rock above the surface?
Explanation:
The situation described here is parabolic movement. However, as we are told that the rock was projected upward from the surface, we will only use the equations related to the Y axis.
In this sense, the movement equations in the Y axis are:
[tex]y-y_{o}=V_{o}.t+\frac{1}{2}g.t^{2}[/tex] (1)
[tex]V=V_{o}-g.t[/tex] (2)
Where:
[tex]y[/tex] is the rock's final position
[tex]y_{o}=0[/tex] is the rock's initial position
[tex]V_{o}=30\frac{m}{s}[/tex] is the rock's initial velocity
[tex]V[/tex] is the final velocity
[tex]t[/tex] is the time the parabolic movement lasts
[tex]g=1.62\frac{m}{s^{2}}[/tex] is the acceleration due to gravity at the surface of the moon
As we know [tex]y_{o}=0[/tex] , equation (2) is rewritten as:
[tex]y=V_{o}.t+\frac{1}{2}g.t^{2}[/tex] (3)
On the other hand, the maximum height is accomplished when [tex]V=0[/tex]:
[tex]V=V_{o}-g.t=0[/tex] (4)
[tex]V_{o}-g.t=0[/tex]
[tex]V_{o}=g.t[/tex] (5)
Finding [tex]t[/tex]:
[tex]t=\frac{V_{o}}{g}[/tex] (6)
Substituting (6) in (3):
[tex]y=V_{o}(\frac{V_{o}}{g})+\frac{1}{2}g(\frac{V_{o}}{g})^{2}[/tex] (7)
[tex]y_{max}=\frac{{V_{o}}^{2}}{2g}[/tex] (8) Now we can calculate the maximum height of the rock
[tex]y_{max}=\frac{{(30m/s)}^{2}}{(2)(1.62m/s^{2})}[/tex] (9)
Finally:
[tex]y_{max}=277.777m[/tex]
10. the discovery by nikola tesla that out-of-phase alternating currents caused _________ is considered one of the 10 greatest scientific discoveries.
A.) motivation
B.) circulation
C.) rotation
I think that the answer is C but give me a minute to make sure I’m correct
the discovery by Nikola tesla that out-of-phase alternating currents caused rotation is considered one of the 10 greatest scientific discoveries.
What is current ?A movement of charged particles, such as electrons or ions, through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flow through a surface is how it is described Charge carriers, which can be any of a number of particle kinds depending on the conductor, are the moving particles. Electrons flowing over a wire are frequently used as charge carriers in electric circuits. They can be electrons or holes in semiconductors. Ions are the charge carriers in an electrolyte, whereas ions and electrons are the charge carriers in plasma, an ionized gas.
The passage of electric charge across a surface at a rate of one ampere is the SI unit for electric current.
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Select the correct answer.
The table shows the specific heat of four substances—brick, dry soil, paper, and water. If all four substances were exposed to sunlight for the same amount of time, which substance would heat up the fastest?
brick 0.9
dry soil 1.26
paper 1.336
water 4.18
A.
brick
B.
paper
C.
dry soil
D.
water
Answer:
The brick would heat up the fastest.
Explanation:
Bricks are thick but they absorb sunlight at an alarming rate.
A. brick
What is specific heat capacity?
In thermodynamics, the specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capability.
specific heat is the amount of energy, measured in joules, needed to increase the temperature of 1 gram of the substance by one Celsius degree. often carried out to metallic elements, specific heat can be used as a basis for comparing how different materials absorb and transfer energy.
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in an inverse relationship, when one variable increases, the other blank
Answer:
Decreases
Explanation:
Given the relationship: a=k/b where k is a constant and a and b are variables, we can now evaluate the relationship.
Increasing a means that b has to reduce for the relationship to stand.
Lets say, a=2 b= o.5 and k =1
These values satisfy the argument.
When we increase a to 4, then we get:
4=1/b
our new b will be= 1/4 or o.25
Thus an increase in one variable leads to a decrease in in the other variable.
Do people use uranium for anything?
Answer:
kjlp;;
Explanation:
Answer:
uranium gets used in bombs
Explanation:
_____ interference occurs when two waves are in phase.
Answer:
constructive interference
Explanation:
Gravity acts on any two objects with mass anywhere in the universe
- "Gravity is a universal attraction between any two objects with mass. Every object in the universe is affected by the force of gravity. The two factors that affect the magnitude of gravity are the mass of the attracted objects and the distance between them. The greater the masses the greater the gravitational force between two objects."
Answer: True
Explanation:
A force is acting on each of the objects below.
Answer:
D
Explanation:
The forces have the same magnitude (3N), but different directions. So they are different.
The magnitude and direction of the forces acting on the object indicates that the resultant forces are;
12) D.
13) A
14) B
15) A
What is a resultant force?A resultant force is the force obtained by adding together or summing the components of the forces acting at a point or location.
12) The magnitude and directions of the forces are;
3 N to the left
3 N downwards
3 N To the right
A force is a vector quantity that has both magnitude and direction, therefore, the forces are different because their directions are different. The correct option is therefore option D.
13) The force of one student is 200 N to the right and the force of the other student is 150 N to the left, therefore;
The resultant force is the sum of the two forces. Taking the right direction as the positive direction, we get;
The resultant single force is; 200 N + (-150) N = 50 N
The resultant force is 50 N. The correct option is option A
14) When the force of gravity is equivalent to the force of the air resistance holding the ball, we get;
The resultant force = 0 N
Force = Mass × Acceleration, therefore;
Mass × Acceleration of the ball = 0
The mass of the ball is not zero, therefore, the acceleration of the ball is zero and the ball is falling at a constant speed. The correct option therefore is option B.
15. The forces acting on the box are;
20 N to the right and 30 N to the left
40 N downwards and 10 N upwards
The resultant force will therefore be; 20 - 30 = -10 which is 10 N to the left and 10 - 40 = -30, which is 30 N downwards
The box will increase in speed downwards and to the left, which corresponds to option A
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20 POINTS HELP FAST PLEASE!!
What two forces are required for generators and electric motors to work?
A: electricity and magnetism
B: magnetism and thermal
C: magnetism and radiant
D: electricity and thermal
In an electric motor, the energy transformation begins as ----
A: electrical and becomes chemical
B: mechanical and becomes electrical
C: mechanical and becomes chemical
D: electrical and becomes mechanical
What two forces are required for generators and electric motors to work? “A” Electricity and magnetism.
In an electric motor, the energy transformation begins as “A” Electrical And becomes mechanical.
(a) the two forces required for generators and electric motor to work is electricity and magnetism.
(b) In an electric motor, the energy transformation begins as electrical and becomes mechanical.
According to Faraday's law, an emf is induced when there is a relative motion of a conductor placed in magnetic field.
Thus, the two forces required for generators and electric motor to work is electricity and magnetism.
Electric motor is a type of dynamo which converts electrical energy to mechanical energy.
Thus, In an electric motor, the energy transformation begins as electrical and becomes mechanical.
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Can I get help and an explanation on C?
Answer:
1.67 m/s
Explanation:
Momentum is conserved.
Initial momentum = final momentum
(30 kg) (10 m/s) + (35 kg) (-10 m/s) = (30 kg) v + (35 kg) (0 m/s)
300 - 350 = 30v
v = -5/3 m/s
Linus will move at 1.67 m/s in the direction opposite that he started.
The focal point of a concave mirror is _____ the mirror. ( in front of; behind)
Answer:
in front of the mirror
Explanation: