Explanation:
They don’t like to stretch.
57:07
Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track and it took her 6 minutes total to complete.
Which best describes her speed and velocity? (There are 60 seconds in 1 minute.)
Her speed is 4.4 m/s, and her velocity is 0 m/s.
Her speed is 1.1 m/s, and her velocity is 0 m/s.
Her speed is 0 m/s, and her velocity is 2400 m/s.
Her speed is 4.4 m/s, and her velocity is 4.4 m/s.
Answer:
v (speed) = S / t = 4 * 400 m / (6 * 60 sec) = 4.4 m/s
The average velocity is zero because there is no net vector displacement.
Answer:
A- Her speed is 4.4 m/s, and her velocity is 0 m/s.
A bear is sitting at rest on a tricycle. The bear then starts to accelerate uniformly at a rate of 2.5
m/s2. How long will it take the bear to reach a velocity of 15 m/s?
Answer:
15 m/s
Explanation:
Initial velocity, u = 0
Acceleration of bear, a = 2.5 m/s²
We need to find time taken by bear to reach a velocity of 15 m/s.
Acceleration is equal to the rate of change of velocity. So,
[tex]a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{15-0}{2.5}\\\\t=6\ s[/tex]
It will take 6 seconds to reach a velocity of 15 m/s.
Choose the statement that is a misconception about a system in chemical equilibrium. (2 points) The rate of the forward reaction is equal to the rate of the backward reaction. The concentrations of the products and reactants dont change. The values of the products and reactants do not have to match each other. The reactions stop once equilibrium is reached.
Answer:
The correct answer is "The reactions stop once equilibrum is achieved"
Explanation:
A system is said to have attained equilibrium when the rate of forward reaction is the same/equal to the rate of backward reaction. The reaction below shows a chemical reaction that is at equilibrium
2N₂O₅ (aq) ⇄ 4NO₂ (aq) + O₂ (aq)
An equilibrium reaction is always a reversible reaction. When the system is at equilibrium (when there is a balance), the concentration of the reactants and products do not change despite the fact that reaction does not stop; what happens however is that the rate at which the reactant(s) are formed (backward reaction) will be equal to the rate at which the product(s) are formed (forward reaction).
From the explanation above, it can be deduced that "The reactions stop once equilibrum is achieved" is a misconception about a system in chemical equilibrium.
What often occurs at convergent tectonic plate boundaries?
A) mountain building
B) increasing air pressure
C) Thinning of the biosphere
D) Decreased erosion
Answer:
C
Explanation:
THINNING OF THE BIOSPHERE
How many cubic centimeters are there in 100 ml of hand sanitizer?
Answer:
100 cubic centimeters.
Explanation:
Formula: multiply the volume value by 1.
Arunner has a speed of 23 m/s. They see the finish line and speed up to 27 m/s. This happens in 5 seconds. If the runner has a mass of 78 kg, with what force did the
runner cross the finish line? Show all work to receive full credit.
Type your answer.
A 50 kg boy runs and jumps with a forward velocity of 1.5 m/s into a 125 kg stationary boat.
What is the final velocity of the boy/boat system?
0.43 m/s, forward
0.43 m/s, backward
1.1 m/s, forward
1.1 m/s, backward
Answer:
0.43 m/s, forward
Explanation:
i just took the test
A 50 kg boy runs and jumps with a forward velocity of 1.5 m/s into a 125 kg stationary boat, then the final velocity of the boy boat system would be 0.43 meters per second in the forward direction, therefore the correct answer is option A.
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
As given in the problem A 50 kg boy runs and jumps with a forward velocity of 1.5 m/s into a 125 kg stationary boat, then the final velocity of the boy boat system,
By using the conservation of the momentum for the boy boat system,
50 × 1.5 + 0 = 175 × v
v = 75/175
v = 0.43 meters / second
Thus, the final velocity of the boy boat system would be 0.43 meters / second in the forward direction.
To learn more about momentum from here, refer to the link ;
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Which of the following is the force that slows abook sliding on a table?
Answer:
Friction
Explanation:
Well things that rub off of each other reacts friction
List 3 machines you can make to reduce the amount of energy you use in your activities (or work)
Answer:
wheel or axle
lever
pulley
A car has uniformly accelerated from rest to a speed of 25m/s after traveling 75m. What is its acceleration in m/s^2
Can someone please help me?
Answer: C
Explanation: I been there before trust meh...
Describe the process by which an electromagnetic wave is produced.
A. An electrically charged particle vibrates, producing only an electric field that moves.
B. An electrically charged particle vibrates, producing electric and magnetic fields.
C. A magnetic field and an electric field collide, producing energy and light.
D. Radio waves break down into smaller wavelengths, producing new waves.
Answer:Im doing that same quiz rn and i just put A
Explanation:
this is because EM energy is produced when electrically charged participles vibrate generating an electric filed and a magnetic field which sends out an EM wave.
i hope this helped
Any Help??? Dued before 2:30pm and it's 9:30am by me... so please take yuh time and ans.... jus ans 1 if you want... This is for course marks.... I appreciate all efforts❤
Answer:
The methodology employed by Galileo contributed to the development of Physics by find moons of Jupiter. (I think)
sorry if it's wrong
Answer:
yes
Explanation:
some of the characteristics described apply to both living and some nonliving things. Other characteristics are unique to living things. Which one characteristic do you think makes it most clear that a car is not a living thing?
Answer:
A car can not reproduce
Explanation:
MRS GREN is the acronym you use to classify if something is living or not
Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition
If something can do all of these things then it is a living thing. If it can't do even one then it isn't living.
According to the graph below, what is the velocity for segment D?
10 m
D
B
Distance (m)
A
2 m
25
45
6.
100
Time (s)
4 m/s
0-1 m/s
0-3 m/s
O 2 m/s
Answer:
works in a similar manner: anything above the origin is positive and below the origin is negative. ... a picture of your coordinate system at the start of every problem you do. ... trip, you figure that you went 60 miles in 1 hour, so you were traveling at a ... s m distance that travel to needed time traveled distance speed average.
Explanation:
A box is at rest on a table. What can you say about the forces acting on the box?
The upward _____and the downward______are balanced.
applied force
frictional force
normal force
drag force
gravitational force
tension
Answer:
gravitational force
Explanation:
Suppose Mitch Marner (mass=80kg) and Zdano Chara (mass=116kg) collide head-on at the blue line when Marner is skating 10m/s and Chara is standing still. Whose velocity would change more and Why?
Answer:
1) The person whose velocity changes more is Marner
2) The change in velocity of Marner is more than the change in velocity of Chara because Chara has more mass than Marner
Explanation:
The given information are
The mass of Mitch Marner = 80 kg
The mass of Zdano Chara = 116 kg
Marner's skating speed before the collision = 10 m/s
From the principle of conservation of linear momentum, we have;
Total initial momentum before the collision = Total final momentum after the collision
m₁×u₁ + m₂×u₂ = m₁×v₁ + m₂×v₂
Where;
m₁ = The mass of Mitch Marner = 80 kg
m₂ = The mass of Zdano Chara = 116 kg
u₁ = The initial velocity of Mitch Marner = 10 m/s
u₂ = The initial velocity of Zdano Chara = 0 m/s
v₁ = The final velocity of Mitch Marner
v₂ = The final velocity of Zdano Chara
Given that the collision is head on, they can be assumed to have an equal instantaneous velocity immediately after collision, therefore;
v₁ = v₂ = v
We have;
m₁×u₁ + m₂×u₂ = (m₁ + m₂) × v₂
By substituting the values, we have;
80 × 10 + 110 × 0 = (80 + 110) × v = 190 × v
Which gives;
80 × 10 + 110 × 0 = 190 × v
800 = 190 × v
v = 800/190 = 80/19 = [tex]4\frac{4}{19} \ m/s[/tex]
Therefore the instantaneous final velocity of both Marner and Chara is [tex]4\frac{4}{19} \ m/s[/tex]
The change in velocity of Marner = [tex]10 - 4\frac{4}{19} = 5\frac{15}{19} \ m/s[/tex]
The change in velocity of Chara = [tex]4\frac{4}{19} - 0 = 4\frac{4}{19} \ m/s[/tex]
Therefore;
1) The person whose velocity changes more is Marner
2) The reason is because the ratio of her mass to the combined mass of both of them is less than the ratio of the Chara;s mass to the combined mass of them both
Which means that the change in velocity of Marner is more than the change in velocity of Chara because Chara has more mass than Marner.
what is computer system ?
Answer:
A computer is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. Modern computers have the ability to follow generalised sets of operations, called programs. These programs enable computers to perform an extremely wide range of task
Explanation:
some ways produce a disturbance and the material they travel through as a result wave travels at a different speed through different materials through which of the following would sound waves travel the greatest speed? A the vacuum of a space B the air inside your house C a wooden dining room table or Dthe water inside the swimming pool
Answer:
Underwater or at the pool.
Explanation:
Sound travels 4.3 times faster then on land but you can't hear as well because it becomes distorted, but you can still hear the sound.
Why is mass a better unit for measuring matter then weight
Explanation:
because gravity is weaker the farther you are from a gravitational source
act.
Which conclusion is best supported by the information
in the chart?
y (m/s)
The object has negative displacement.
O The object has negative acceleration.
The object does not have displacement.
The object is not accelerating.
Answer:the object does not have displacement
Explanation:
Why does water that is frozen in an ice cube tray stay in the shape of a cube when it is
taken out of the tray?
A. The water particles can only slip past one another.
B. The water particles become locked in place.
C. The water particles stop moving completely.
D. The water particles grow bigger to fill the space.
Water freezes to form ice cubes. In this solid structure, particles are strongly bonded each other thus, the water particles become locked in place.
What is freezing point?Freezing point is the temperature at which the substance converts from liquid state to solid state. In solid state, all particles are strongly bonded together.
In water, particles in liquid state are free to flow and they are not locked at all. In gaseous state no definite shape or volume are there and particles are away from each other and they diffuse easily.
In solid state particles are not at all free to flow and thus they are locked in place. That's why water molecules are locked in place in a cube until they melt completely.
To find more on freezing, refer here:
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A body has translatory motion if it moves along a
The ramp is used to lift a heavy load
what are the principals behind Newtons first and third law?
Answer:
First law: An object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force. (i.e. Objects in motion tend to stay in motion. Objects at rest tend to stay at rest.)
Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.
Explanation:
What will happen to this current if a magnet is brought near the cord? A. It will exert a force on the voltage. B. The electric current will stop flowing. C. The resistance of the wire will decrease. D. It will exert a force on the electric current.
Answer:
The correct answer is D)
Explanation:
When an electric magnet is brought near a cord with an electric current, the cord will most likely deflect away from the magnet because electric fields flowing through a wire generates its own magnetic field.
Cheers!
A rocket is being launched straight up. Air resistance is not negligible. Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other will be graded.
Answer:
the Force is the one created by the engines, W is the weight of the rocket and its fuel and fr is the friction force created by the air
Explanation:
Unfortunately you did not include a diagram with the point where to make the drawing, let's assume that the point is the initial launch point, just leaving the ramp.
In the attached we can see the forces on the rocket, the Force is the one created by the engines, W is the weight of the rocket and its fuel and fr is the friction force created by the air, which depends on several factors, the shape of the rocket, velocity, and air density with height
2) A man squeezes a pin between his thumb and finger, as shown in Fig. 6.1.
finger
pinhead
pin
thumb
Fig. 6.1
The finger exerts a force of 84 N on the pinhead.
The pinhead has an area of 6.0 x 10-5 m2.
(i) Calculate the pressure exerted by the finger on the pinhead.
P
42
pressure =
hope that helps and please tell me if i am wrong :)
Emmit is lifting a box vertically which forces are necessary for calculating the total force
Answer:
FG and FP
Explanation:
Gravitational Force(FG) because the box is being pulled down and a resistance force pushing up because he is pushing(FP) up on the box.
I hope this helps!
Helppppp pleaseee :(
1) push down on the end of the lever, and 2) 3/4 of the way from the fulcrum
