Answer:
skateboard b
Explanation:
p=mv
skateboard a
p=(60kg)(1.5m/s)=90kg*m/s
skateboard b
p=(50kg)(2m/s)=100kg*m/s
Skateboarder B has the greater momentum because the momentum of A is 90 kg m/s and the momentum of B is 100 kg m/s so B has the greater momentum.
What is momentum?Momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum. Check out Newton's laws of motion.
According to Newton's second law, if a particle is subjected to a constant force for a specific amount of time, the result of the force and time (referred to as the impulse) is equal to the change in momentum. On the other hand, a particle's momentum represents the length of time needed for a consistent force to bring it to rest.
According to the question,
For Skateboarder A :
momentum = 60 × 1.5
momentum = 90 kg m/s
For Skateboarder B :
momentum = 50 × 2
momentum = 100 kg m/s.
Hence, B has greater momentum than A.
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is aluminum foil reflecting onto something conduction, convection, or radiation?
(this is for science sorry if i chose the wrong catagory I don't know the fancy word for science)
What is the speed of a jet plane that flies 8100 km in 27 hours (in km/hr)
what happens to the particles in a substance during a physical change?
Answer:
In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy. ... Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. Only their arrangement, energy and movement changes.
Explanation:
this is true because if you think about it if you put a pill in a glass of water it dissolves its like particles
Which plate undergo subduction at oceanic-continental convergent plate boundaries?Why?
Answer:
Oceanic crust may collide with a continent. The oceanic plate is denser, so it undergoes subduction. This means that the oceanic plate sinks beneath the continent. This occurs at an ocean trench.
Explanation:
The chart below shows the dates of eclipses in the years 2006 and 2007. What is the best explanation for the frequency of eclipses? The Moon's orbit is tilted relative to the plane of the Earth's orbit. About every six months, the Sun, Moon and Earth are aligned enough for a solar and a lunar eclipse to occur. The Earth and Moon orbit the Sun in opposite directions. When the Moon's orbit crosses the Earth's orbit, a lunar or solar eclipse will occur. A lunar or a solar eclipse occurs every time the Moon orbits the Earth. The Moon orbits the Earth four times a year. The atmospheric conditions that cause eclipses are only found at certain locations and times of year.
Answer:
It's A
As the Gizmo shows, the Moon orbits at an angle relative to the plane of Earth's orbit. Usually, the Moon is above or below the Earth when an eclipse could happen. Every six months or so, the Moon, Earth and Sun are lined up sufficiently to create a lunar and a solar eclipse.
Answer:
A
Explanation:
The Moon's orbit is tilted relative to the plane of the Earth's orbit. About every six months, the Sun, Moon and Earth are aligned enough for a solar and a lunar eclipse to occur.
A train travelling at 20 m/s has 2 000 000 J of kinetic energy. What is the mass of
the train?
Answer:
10,000 kgExplanation:
The mass of the train can be found by using the formula
[tex]m = \frac{2k}{ {v}^{2} } \\ [/tex]
k is the kinetic energy
v is the velocity
From the question we have
[tex]m \frac{2(2000000)}{ {20}^{2} } = \frac{4000000}{400} = \frac{40000}{4} \\ [/tex]
We have the final answer as
10,000 kgHope this helps you
Answer:
10,000 kg
Explanation:
.
A football player with a mass of 100 kg from runs from rest towards his opponent and hits him with a force of 500 Newtons 5 seconds later. What was his momentum before impact?
Answer:
2500kgm/s
Explanation:
Change in momentum is equal to impulse, numerically.
Ft=m( v-u)
But he begins from rest so u= 0
Then
Ft= mv
500(5)=mv
2500= mv
Which is a characteristic of all ions? They are made of one type of atom. They have one overall charge. They are made of two or more types of atoms. They have two or more overall charges.
Answer:
They are made of one type of atom.
Explanation:
Answer:
The answer is A
Explanation:
What is the centripetal force needed to keep a 3.0kg mass moving in a circle of radius 0.50 m at a speed of 8.0m/s?
Answer:
384N
Explanation:
Given parameters:
Mass = 3kg
radius = 0.5m
Speed = 8m/s
Unknown:
Centripetal force = ?
Solution:
The centripetal force is the inward force that keeps a body in motion along a circular path.
It is mathematically expressed as;
F = [tex]\frac{mv^{2} }{r}[/tex]
m is the mass
v is the speed
r is the radius
Now insert the parameters and solve;
F = [tex]\frac{3 x 8^{2} }{0.5}[/tex] = 384N
11. A ball rolls across a table of height 1.2 meters, leaves the table with a speed of ve, and lands 0.69m
from the edge of the table.
vo
1.2 m
-0.69 m
a. Find the time it takes the ball to fall from the edge of the table and reach position A in the picture
above.
Answer:
sorry don't know i just need points
Explanation:
A force of 85 N is used to push a box along the floor a distance of 15 m. How much work was done?
Answer:
1275J
Explanation:
Given parameters:
Force on box = 85N
Distance moved = 15m
Unknown:
Work done = ?
Solution:
Work done is the amount of force applied on a body to move it through a specific distance.
Work done = Force x distance
Now insert the parameters and solve;
Work done = 85 x 15 = 1275J
Based on the law of conservation of energy, which statement is correct?
A Energy is always being added to all parts of the Universe.
B. Energy is often destroyed in some parts of the Universe.
O C. Energy in a closed system cannot change forms.
D.
Energy in an isolated system remains constant.
Answer:
D. Energy in an isolated system remains constant
Explanation:
I recently took this test and this was the correct answer. Please like if this helped you! :)
The statement "Energy in an isolated system remains constant" is correct which is based on the law of conservation of energy option (D) is correct.
What is the law of conservation of energy?The law conservation of energy can be defined as the energy that cannot be created either it cannot be destroyed it only can change from one state to another state.
As we know, from the definition of the law of conservation of energy,
The energy that cannot be created either cannot be destroyed.
According to the rule of conservation of energy, the energy in an isolated system doesn't change.
Thus, the statement "Energy in an isolated system remains constant" is correct which is based on the law of conservation of energy option (D) is correct.
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How fast is a 5 kg object traveling that has 20 kg m/s of momentum?
Answer: 100
Explanation:
What are machines fueled by?
Group of answer choices
A. Gasoline only
B. Electricity only
C. Sun
D. Energy
Which device is designed to convert chemical energy into kinetic energy ?
A.an A.C. Generator
B. A battery powered torch
C.a car engine
D.a wind-up mechanical clock
Answer:
A.C. Generator
Explanation:
The device designed to convert chemical energy into kinetic energy is an A.C generator.
The generator uses fuel to cause the mechanical motion of the pistons in the device.
Chemical energy is a form of energy found between the bonds of compounds and molecules. When the bonds are broken, energy is released. The heat energy produced drives pistons and cause mechanical motion of the body. This is a form of kinetic energy which causes the motion of a body.PLEASE HELP ME!!!!
A. The velocity increases during the time periods labeled A and C.
B. The velocity remains constant as the ball bounces.
C. The velocity increases during the time periods labeled B and D.
D. The velocity decreases during all time periods.
Answer:c
Explanation:
Answer:
A. The velocity increases during the time periods labeled A and C.
Explanation:
in humans what makes the sound vibration vibrate
Answer:
sound vibration of spicker
What is the acceleration of the box?
Answer:
a=4,32m/s^2
Explanation:
Fnet = F1 - F2
= 12-1.2
= 10.8N
m=2.5kg
Fnet =ma
10.8=2.5a then divide both sides by 2.5 to get acceleration
An object with mass 30 kg travelling as speed of 11 m/s receives an impulse of
240 kg m/s. What is the final velocity of the object?
Answer:
V₂ = 19 [m/s]
Explanation:
The final linear momentum will be equal to the sum of the initial momentum plus the momentum received. By means of the following equation, we can determine the final momentum.
[tex]m_{1}*v_{1} + IMP_{1-2} = m_{2}*v_{2}[/tex]
where:
m₁ = m₂ = mass = 30 [kg]
v₁ = velocity = 11 [m/s]
IMP₁-₂ = 240 [kg*m/s]
v₂ = final velocity [m/s]
[tex](30*11) + 240 = 30*V_{2}\\330 + 240 = 30*V_{2}\\v_{2}=19 [m/s][/tex]
The final velocity of the object is 19 m/s
The impulse is given by:
Impulse = m(v - u)
where m is the mass, v is the final velocity and u is the initial velocity.
Given that impulse = 240 kgm/s, u = 11 m/s, m = 30 kg. Hence:
Impulse = m(v - u)
240 = 30(v - 11)
8 = v - 11
v = 19 m/s
The final velocity of the object is 19 m/s
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Canyon walls are eroded at a rate of approximately:
Group of answer choices
A half a centimeter per day.
B half a centimeter per year.
C one centimeter per day.
D one centimeter per year.
Gravity causes all falling objects to accelerate at a rate of 98 m/s2.
O True
O False
What are the reactants in the photosynthesis chemical equation?
The photosynthesis chemical equation states that the reactants
(carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas. The single chemical equation represents the overall process of photosynthesis.
hope this help you!
WILL MARK BRAINLIEST!!
The diagram shows currents that form as water is heated. A full pot sits on a stove. 2 pairs of curved arrows are inside the pot, Each has a blue arrow curving downward from the top of pot and a red arrow curving up from the bottom of the pot. Which would most likely contain this same type of current? the air above a wildfire a carton of milk in a refrigerator a snowdrift on a shady mountainside a boulder in a hot desert
Answer:
air above a wild fire
Explanation:
the type of current formed in the pot is referred to as a convectional current which forms when the heated fluid rises making the cool fluid descend the same happens with the air above a wildfire a convectional current will form when the warm air rises and the cool air descends.the main reason for tge descending and ascending is that the air or liquid closest to the source of heat will get heated making it lighter but the air or liquid tgat was further from the source of heat will not be as light so as the warm fluid rises, the cool fluid descends.
Answer:
air above a wildfire
Explanation
why does deceleration lower force during a collision?
A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 100 N is being applied to the sled rope parallel to the ground, what is the force of friction between the sled and the snow?
Answer:
60.18 N
Explanation:
Given that:
The force applied on the sled = 100 N
Suppose, the angle between the sled rope and the ground = 53°
The horizontal force which acts in the horizontal direction can be expressed as:
[tex]F_x = F \ cos \theta[/tex]
[tex]F_x = 100 \ cos (53)[/tex]
[tex]F_x = 60.18 \ N[/tex]
But if the angle between the sled rope is parallel to the ground. Then, we use an angle on a straight line which is = 180°
[tex]F_x = F \ cos \theta[/tex]
[tex]F_x = 100 \ cos (180)[/tex]
= 100 × -1
= -100 N
An object with a mass of 7kg gains the speed 26 meters per second after traveling the distance 2.8m. Calculate the resulting force that acts on it.
Answer:
F = 845 [N]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f} ^{2} =v_{o} ^{2} +2*a*x[/tex]
where:
Vf = final velocity = 26 [m/s]
Vo = initial velocity = 0
a = acceleration [m/s²]
x = distance = 2.8[m]
[tex]26^{2} = 0 +(2*a*2.8) \\5.6*a = 676\\a = 120.71[m/s^{2}][/tex]
Now we have to use Newton's second law which tells us that force is equal to the product of mass by acceleration.
ΣF = m*a
where:
F = force [N]
m = mass = 7 [kg]
a = acceleration = 120.71 [m/s²]
[tex]F = 7*120.71\\F = 845 [N][/tex]
Even though you are getting closer to the sun as you ascend into the troposphere, why does the temperature drop? the lower atmosphere is heated by the ground warm air stays below cold air the troposphere is a stable layer ozone blocks the sunlight
The Sun light is reflected back by earth. On process of reflecting back the sunlight, the lower layer of troposphere absorbs the most sunlight and upper layer absorbs the least sunlight. So when We ascend to troposphere, we move towards the upper layer of troposphere where sunlight is least absorbed and is colder than lower layer where sunlight is most absorbed
In the troposphere, the temperature generally decreases with altitude. The reason is that the troposphere's gases absorb very little of the incoming solar radiation. Instead, the ground absorbs this radiation and then heats the tropospheric air by conduction and convection.
HELP ASP PLSSSSSS ASP
Answer:
heart rate increases during activity
Explanation:
You can work at 70 to 85 percent of your maximum heart rate during vigorous activity.
Explain why common "contact forces" such as a person pushing on a wall are actually caused by the electric force. In your answer, you must discuss the role of subatomic particles in this interaction, whether the atoms in the person’s hand and the wall come into contact or not
Answer:
are due to the fact that the electrons that are in one of the objects get close to electrons that are in the other object and since it has the same charge, inte
Explanation:
The contact forces, such as friction or the push force, are due to the fact that the electrons that are in one of the objects get close to electrons that are in the other object and since it has the same charge, intense repuesive forces are formed that objects move. We can see that in these forces the electrons are still attached to the material and only electoral repulsion is what creates the force.
In the previous explanation, it is valid for all types of material, the only change occurs due to the strength of the bond, in the case of materials with free electrons, such as metals, the forces are small, so the sliding occurs for small bourgeois
In insulating materials such as rubber where the electronons are tightly bound, closer proximity is needed to move the electrons from their equilibrium position.
A cannon with a muzzle velocity of 500. meters per second fires a cannonball at an angle of 30.° above the horizontal. What is the vertical component of the cannonball's velocity as it leaves the cannon?
0.0 m/s
250. m/s
433 m/s
500. m/s
Complete question
A cannon with a muzzle velocity of 500. meters per second fires a cannonball at an angle of 30.° above the horizontal. What is the vertical component of the cannonball's velocity as it leaves the cannon?
A 0.0 m/s
B 250. m/s
C 433 m/s
D 500. m/s
Answer:
The correct option is C
Explanation:
From the question we are told that
The velocity is [tex]v = 500 \ m/s[/tex]
The angle is [tex]\theta = 30^o[/tex]
Generally the vertical component of the canon ball is mathematically represented as
[tex]v_y = v * cos (30 )[/tex]
=> [tex]v_y = 500 * cos (30 )[/tex]
=> [tex]v_y = 433 \ m/s[/tex]
Answer:
250. m/s
Explanation:
It is vertical component so you do: 500mSin(30°) = 250m/s