Two kids are playing tag. The first kid is running at an unknown speed chasing the other. The first kid has a mass of 25 kg and a KE of 450 J.
How fast is the first kid running?
I really need help
Answer:
1mph
Explanation:
while riding in a car, you notice some fuzzy dice hanging from the review mirror. the car is traveling at a constant speed. according to newton's first law, what will happen when the car stops suddenly.
A. the dice move to the right
B. the dice move forward
C. the dice move backwards
D. the dice move to the left
Answer:
I need points thank you
This problem will require you to make some assumptions, so be sure that your assumptions are clear. You have dinner reservations at Atrio in Brickell, but the elevator is broken. If you decide to take the stairs does that entitle you to eat the entire Chocolate Fondue for Two dessert by yourself? The Chocolate Fondue for Two is 1 lb. of dark chocolate, served with a variety of fruits for dipping.
Answer:
No
Explanation:
The statement is implying that if you do a certain amount of work, you're entitled to do a certain amount of work. Sometimes, work doesn't entitle you a reward.
If the density of water is 1 gram/cm3, this means that the mass of 100 cm3of water should be
Answer:
100 g
Explanation:
Or 0.1 kilograms, just count
If the density of water is 1 g/cm³, the mass of 100cm³ of water should be 100g.
DENSITY:
The density of a substance is its mass in relation to its volume. According to this question, the density of water is 1 g/cm³. This means that for every 1g (mass) of water, there contains 1cm³ (volume) of solvent. Hence, for 100cm³ of water, there should be a mass of 100g of water considering the density of water.Learn more at: https://brainly.com/question/14940265?referrer=searchResults
How is it technically correct to say that a car making a u-turn can have a constant speed but cannot have a constant velocity?
During the "U" part of the turn, the car would follow an approximately circular path, and if it's moving at a constant speed, it would have to accelerate toward the center of the circle in order to change its direction.
In uniform circular motion, the factor that remains constant is.............
Answer:
When a body is in uniform circular motion, its speed remains constant but its velocity, angular acceleration, angular velocity changes due to change in its direction.
If a bag of pretzels says it contains 10 servings, and each serving is 150 calories, how many calories would you consume if you ate the entire bag?
300, adding extra healthy calories
1,000, adding extra unnecessary calories
1,500, adding extra unnecessary calories
2,000, adding extra healthy calories
Answer:
5400
Explanation:
i calculated it
Big brain
a 3.2 kg durian fruit is pushed across the table.If the acceleration of the durian is 3.1 m/s/s to the right,what is the net force exerted on the fruit?(Fnet=ma)
Answer:
9.92 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 3.2 × 3.1
We have the final answer as
9.92 NHope this helps you
Answer:
9.92
Hope I helped
Imagine a 0.2 kg ball moving at 5 m/s colliding with a 0.3 kg ball moving at 2 m/s in the same direction. After the collision the 0.2 kg green ball stops moving and the 0.3 kg purple ball continues moving in the same direction.
Answer:
[tex]m1v1 + m2v2 = m1v3 + m2v4[/tex]
[tex](0.2 x 5) + (0.3 x 2) = (0.2 x 0) + (0.3 x v4)[/tex]
[tex]1.0 + 0.6 = 0 + 0.3v4, 0.3v4 = 1.6[/tex]
[tex]v4 = 1.6/0.3 = 5.3 m/s (2 sf)[/tex]
6. You are holding a rock with a mass of 0.30 kg. You let the rock drop from your hand. It hits the ground 0.75
seconds later. How fast was the rock moving right before it hit the ground? For credit, show work in detail.
Answer:
v = 14.7m/s
Explanation:
When the rock was at the top of cliff it had only Potential Energy and no Kinetic Energy but soon as the rock hit the ground all the Potential Energy converted into Kinetic Energy so by the Law of Conservation of Energy
[tex]Potential\ Energy = Kinetic\ Energy\\mgh=\frac{1}{2}mv^2\\\\v^2=\frac{2mgh}{m} \\\\v^2=2gh[/tex]
because all of that potential energy got converted into kinetic energy so we use the following formula as we need to calculate the velocity (v)
[tex]Potential\ Energy = Kinetic\ Energy\\mgh=\frac{1}{2}mv^2\\\\v^2=\frac{2mgh}{m} \\\\v^2=2gh[/tex]
here we know [tex]g = 9.8m/s^2[/tex] because the rock was under free fall motion so it had acceleration of 9.8 but we do not the height which is h but we do know the formula:
[tex]Velocity=\frac{Displacement}{Time}[/tex]
the height h is the displacement so we replace height with the following:
[tex]Velocity=\frac{Displacement}{Time}\\\\Displacement=Velocity*Time\\h=vt[/tex]
now, insert h = vt in the above equation
[tex]v^2=2gh\\\\v^2=2g(vt)\\v^2=2vgt\\\\\frac{v^2}{v} =2gt\\\\v=2gt\\v=2(9.8)(0.75)\\v=14.7m/s[/tex]
HELPPPPPPP!!!!!!!!!!!!!!!!
What is the velocity of an object moving 10 m in 5 seconds to the right?
Explanation:
The velocity of an object can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex] v = \frac{10}{5} \\ [/tex]
We have the final answer as
2 m/sHope this helps you
Cars, trucks, and SUVS use seatbelts as safety devices. Roller coasters use
bars. Use Newton's 1* Law of Motion to explain how the seatbelt or restraint
bar help keep you safe ina collision. Be sure to identify forces and velocity.
sorry
Explanation:
Sorry
15 pointsss please help meeeeeeeeeee
The velocity of an object can be calculated as:
starting velocity + (_____________________ * delta-t)(2.5 Points)
(one option)
A. acceleration
B. displacement
C. instantaneous velocity
D. average velocity
Answer:
the answer is A. acceleration mom
Explanation:
:)
Define Work And its types
Positive Work.
Negative Work.
Case of zero work done.
Displacement at an angle to the force.
Energy.
Kinetic Energy.
work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement.
Why it is some times possible to loosen caps on screw
top bottles by dipping the cap briefly in hot water?
Answer:
Solids expand when they are heated.
Explanation:
It is possible to loosen caps on the screw top bottles by dipping the cap briefly in hot water due to the fact that whenever a solid is heated, it expands. This means that the size of the solid Screw cap (in this our case) increases as the temperature does.
This increase in size causes it to slide off easily from the mouth of the bottle when a little twisting effort is applied.
Benny wonders why when he presses his finger against a map nothing happens to the map. However if he presses a thumbtack into the map using the same force the tack will probably poke a hole in the map.
Answer: The pressure exerted on a surface by an object increases as the surface area of contact decreases.
Explanation:
Pressure measures the amount of force exerted per a given area of an object. From this definition, the surface area of the object and force applied, affects the pressure applied.
As Benny presses his finger against a map, nothing happens to the map because the force applied is affected by the increased surface area of his finger. However as he presses a thumbtack into the map using the same force the tack will probably poke a hole in the map because the small( decreased) surface area of the sharp point of the thumbtack produces a much larger pressure on the map than the area of Benny finger. I hope this helps, thanks!
when two substance mixed together what does not indicate that a chemical reaction has
Answer:
When two substances are mixed together, a color change is observed. This observation is not enough evidence that there is a chemical reaction happening because color changes are not indicators of chemical reaction:
how much power is used for machine does 28J of work and 7 seconds
Answer:
3N
Explanation:
Chris threw a basketball a distance of 27.5 m to score and win his
high school basketball game. If the shot was made at a 50.0° angle
above the horizontal, what was the initial speed of the ball?
Answer:
v₀ = 16.55 m/s
Explanation:
This motion of the ball can be modeled as a projectile motion with following data:
R = Range of Projectile = 27.5 m
θ = Launch Angle = 50°
g = acceleration due to gravity = 9.81 m/s²
v₀ = Initial Speed of Ball = ?
Therefore, using formula for range of projectile, we have:
[tex]R = \frac{v_{0}^2\ Sin2\theta}{g}\\\\v_{0}^2 = \frac{Rg}{Sin2\theta}\\\\v_{0}^2 = \frac{(27.5\ m)(9.81\ m/s^2)}{Sin100^o}\\\\v_{0} = \sqrt{273.93\ m^2/s^2}[/tex]
v₀ = 16.55 m/s
An airplane is traveling at an altitude of 15,490 meters. A box of supplies is dropped from its cargo hold. What is the cargo's velocity when it hits the ground? (Show your work and do not forget units)
Answer :
556.59 m/s.
Explanation:
Given that,
An airplane is traveling at an altitude of 15,490 meters.
A box of supplies is dropped from its cargo hold. We need to find the velocity of cargo when it hits the ground.
The initial velocity of the box is 0 as it as at rest. Let v is the velocity of cargo when it hits the ground. We can find it using third equation of motion as follows :
[tex]v^2-u^2=2as[/tex]
Put u = 0 and a = g
[tex]v^2=2gs\\\\v=\sqrt{2gs} \\\\v=\sqrt{2\times 10\times 15490 } \\\\v=556.59\ m/s[/tex]
So, when it hits the ground its velocity is 556.59 m/s.
A ball is thrown straight off a 150 meter high roof at 20 m/s.
How long does it take for the ball to hit the ground?
What was the ball's final downward velocity?
How far did the ball travel horizontally?
What was the ball's displacement?
Answer:
I'll try and find the answer for you:)
Explanation:
I can't promise you I will though
If a 0.8kg ball is thrown with a velocity of 5 m/s,what is its KE?(KE=1/2 x m x v2)
Based on Newton's 3rd law, the force pairs always act on what?
(someone please answer i need help)
Answer:
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
Explanation:
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
Please answer the circled questions, I will give you brainliest
Answer:
yo so if nobody helps ill gladly take the brainliest
Explanation:
any three different between of rarefaction and compression
Answer:
credits to the real owner of the answer I just found it here
How much kinetic energy does an 80 kg man have while running at 3 m/s?
Hello!
[tex]\large\boxed{KE = 360 J}[/tex]
Use the equation KE = 1/2mv² to solve for the kinetic energy of the man.
We are given the mass and velocity, so plug these values into the equation:
KE = 1/2(80)(3²)
KE = 1/2(720)
KE = 360 J
What is the supply voltage?
Answer:
[sə′plī ‚vōl·tij] (electricity) The voltage obtained from a power source for operation of a circuit or device.
Explanation:
hope this helps :)
Cuál es la diferencia entre fricción beneficiosa y perjudicial? Pon 5 ejemplos de cada uno.
Answer:
Difference is given below.
Explanation:
The main difference between beneficial and harmful friction is that beneficial friction is necessary for performing different activities while on the other hand, harmful effect of friction is destroy different parts of products and machines. examples of beneficial friction are walking, holding things, rubbing hands to produce heat, running etc whereas examples of harmful friction are destruction of sole, slipping, tearing of machine's part, Wet roads and Mudslides etc.
12. A rocket, initially at rest on the ground, accelerates vertically. It accelerates uniformly until it
reaches a speed of 900 m/s after 30 s. After this period of uniform acceleration, the rocket
engine cuts out. During the next 90 s, the upward speed of the rocket decreases uniformly to
zero.
speed
m/s
times
plot a speed-time graph for the rocket for the first 120 s of it's flight
Answer:
We kindly invite you to read carefully the explanation and check the image attached below.
Explanation:
According to this problem, the rocket is accelerated uniformly due to thrust during 30 seconds and after that is decelerated due to gravity. The velocity as function of initial velocity, acceleration and time is:
[tex]v_{f} = v_{o}+a\cdot (t-t_{o})[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, measured in meters per second.
[tex]v_{f}[/tex] - Final velocity, measured in meters per second.
[tex]a[/tex] - Acceleration, measured in meters per square second.
[tex]t_{o}[/tex] - Initial time, measured in seconds.
[tex]t[/tex] - Final time, measured in seconds.
Now we obtain the kinematic equations for thrust and free fall stages:
Thrust ([tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]a = 30\,\frac{m}{s^{2}}[/tex], [tex]t_{o} = 0\,s[/tex], [tex]0\,s\le t< 30\,s[/tex])
[tex]v = 30\cdot t[/tex] (2)
Free fall ([tex]v_{o} = 900\,\frac{m}{s}[/tex], [tex]a = -9.807\,\frac{m}{s}[/tex], [tex]t_{o} = 30\,s[/tex], [tex]30\,s \le t \le 120\,s[/tex])
[tex]v = 900-9.81\cdot (t-30)[/tex] (3)
Now we created the graph speed-time, which can be seen below.