Answer:
13.71
Explanation:
13.71 miles per hour
Question in the photo
Answer:
answer is option 2 increasing the resistance /output distance
What happens to the speed of the electrons when the resistance is decreased?
The speed of the electrons does not change.
The electrons speed up.
The electrons slow down.
Answer:
they slow down
Explanation:
Because number of electrons remain same in the closed circuit or wire, due to conservation of charge in any case. But due to addition of a external resistor current will decreases, by applying ohm's law( V=IR).
Answer:
The electrons slow down.
Explanation:
Is density of an object proportional to its conductivity?
Answer:
Yes, the density of an object is proportional to its conductivity.
Explanation:
The "Thermal conductivity" of an object is dependent on three things: temperature, density and moisture content. This means that an object becomes more conductive if it has a higher temperature, higher density and more moisture in its content. This makes them directly proportional to each other.
The denser an object is, the more likely it will conduct heat because its atoms are tightly packed compared to less denser ones like air. Such position of atoms hastens the transfer of energy.
Which of the following does not show an example of energy being transferred according to the work-energy theorem?
a child pushing a toy car and making it move very fast
a baseball player hitting a baseball to the outfield
a soccer player kicking a soccer ball to a teammate
a driver pushing on a stalled car without moving it
The answer for you is D.
Have a nice day!
Hope This Helped! : )
1. A student athlete is participating in the hammer throw. The student rotates in uniform circular
motion with the mass rotating 4.5m away from the center of the rotation
4.5m
Refer to the above information and diagram. The student athlete can rotate so that the
Object is moving with a speed of 15 m/s.
What is the acceleration for this uniform circular motion?
Answer:
[tex]a_{c} = 50\ m/s^2[/tex]
Explanation:
In uniform circular motion, the acceleration of the object is due to the changing direction of velocity of the object. this acceleration is referred to as centripetal acceleration. It can be calculated by following formula:
[tex]a_{c} = \frac{v^2}{r}[/tex]
where,
ac = centripetal acceleration = ?
v = speed of the object = 15 m/s
r= radius of circular motion = distance of object from center of rotation = 4.5 m
Therefore, using these values in equation, we get:
[tex]a_{c} = \frac{(15\ m/s)^2}{4.5\ m}\\\\a_{c} = 50\ m/s^2[/tex]
When dave solved the following question , His workings were as follows
Question : Find the resultant of two vectors of 3 units and 4 units acting at a point O at an angle of 45° with each other.
Workings:(see image)
Main Question : Why did Dave change the Subtraction sign to addition sign ? (see 1st and 2nd line of workings) or see 2nd image.
Well, the lines of workings are cut off in the middle, and there's no 2nd image.
But I think it must have to do with the "cos" terms at the right end of the picture.
I'm guessing now, because the part I'm interested in would be just past the edge, where we can't see it.
I think that the first line says "cos(some angle)", and at the same place in the second line it says "cos(180 - the same angle)".
If that's what it says, then that's your answer, because cos(anything) is equal to the negative of cos(180 - the same thing).
That's the best I can do for you just now. Honestly, I don't see the connection yet between the question Dave is working on and the two lines I see in the picture.
A helicopter flies for 80 miles. then turns and flies at a heading of 60°for 40 miles.What is the magnitude and direction of the net displacement of the helicopter.Include a drawing
Answer:
Please find attached the motion of the helicopter (drawn to scale) showing the magnitude and the direction of the net displacement of the helicopter obtained by measurement to be 105 miles and 19° respectively
By calculation, the magnitude of the net displacement is approximately 105.83 miles and the direction of the net displacement is approximately 19.1066°
Explanation:
The parameters of the motion of the helicopter are;
The distance the helicopter flies before turning = 80 miles
The distance the helicopter then turns and flies = 40 miles
The direction the helicopter turns = 60°
Therefore, we have;
The total length the helicopter flies in the original direction = The component of the length of the 40 mile flight that is in the original direction + The distance the helicopter flies before turning
∴ The total length the helicopter flies in the original direction = 40 × cos(60°) + 80 = 20 + 80 = 100
The total length the helicopter flies in the original direction = 100 miles
The component of the 40 mile flight that is perpendicular to the original direction = 40 × sin(60°) = 40 × √3/2
The magnitude of the net displacement = √(100² + (40×√3/2)²) ≈ 105.83
The magnitude of the net displacement ≈ 105.83 miles
The direction of the net displacement = tan⁻¹((40 ×√3/2)/(100)) ≈ 19.1066°
The direction of the net displacement ≈ 19.1066°.
a 1200-kg car rolling on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring?
Answer:
The stiffness constant of the spring is 80831.191 newtons per meter.
Explanation:
Given that all non-conservative forces are negligible, by the Principle of Energy Conservation we get that initial translational kinetic energy of the car is turned into final elastic potential energy of the spring. That is:
[tex]U_{f} = K_{o}[/tex] (1)
Where:
[tex]U_{f}[/tex] - Final elastic potential energy of the coiled spring, measured in joules.
[tex]K_{o}[/tex] - Initial translational kinetic energy, measured in joules.
By definitions of elastic potential and translational kinetic energies we expand (1):
[tex]\frac{1}{2}\cdot k\cdot x^{2} = \frac{1}{2}\cdot m \cdot v^{2}[/tex] (1b)
Then, we clear the stiffness constant within the expression:
[tex]k\cdot x^{2} = m\cdot v^{2}[/tex]
[tex]k = m\cdot \left(\frac{v}{x} \right)^{2}[/tex]
Where:
[tex]m[/tex] - Mass of the car, measured in kilograms.
[tex]v[/tex] - Initial speed of the car, measured in meters per seconds.
[tex]x[/tex] - Final deformation of the coiled spring, measured in meters.
If we know that [tex]m = 1200\,kg[/tex], [tex]x = 2.2\,m[/tex] and [tex]v = 18.056\,\frac{m}{s}[/tex], then the stiffness constant of the spring is:
[tex]k = (1200\,kg)\cdot \left(\frac{18.056\,\frac{m}{s} }{2.2\,m} \right)^{2}[/tex]
[tex]k = 80831.191\,\frac{N}{m}[/tex]
The stiffness constant of the spring is 80831.191 newtons per meter.
What is the path of a projectile?
a wavy line
a parabola
straight down
Projectiles do not follow a predictable path.
Answer:
I think it is a parabola.
Calculate the kinetic energy of a 9 kg watermelon being thrown at you with a speed of 12 m/s.
Answer:
648 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 9 \times {12}^{2} \\ = \frac{1}{2} \times 9 \times 144 \\ = 9 \times 72 \: \: \: \: \: \: \: \: \: \: \: [/tex]
We have the final answer as
648 JHope this helps you
Sedimentary rocks were initially deposited as? will give brainliest
a. flat vertical layers
b. horizontal layers
c. soft folded beds
d. hard, flat rock layers
Based on my notes the answer must be B. horizontal layers
Answer:
B. horizontal layers
Explanation:
A soccer ball is kicked with an initial velocity of 22 m/s at an angle of 48 degrees above the horizontal. Calculate a) the maximum height of the ball and b) the time to get to this height.
please answer fast!
You push a 10 kg box across the floor. The box is initially at rest. You apply a force on the box for
0.05 seconds. If the velocity of the box is 50 m/s after you push it, what is the net force you applied
to the box? (Hint: remember impulse! F*t = m*v2 - m*v1)
Answer:
F = ma The force of friction for a 7.5-kg object being pushed horizontally at a constant A 30-kg wooden box is resting on a carpeted surface. If the ... An applied force of 21 N accelerates a 9.0-kg wagon at 2.0 m/s² along the sidewalk. (u=0,034. 5. A sled of mass of 50.0 kg is pulled along a flat, snow-covered ground.
Explanation:
what is 200g in weight
Answer:
0.441
Explanation:
life is great :))
A helium balloon is tied to a top-pan balance. A metal block of mass 100 g is placed on the balance. The reading on the balance is 91 g. Which statement can be deduced from this experiment?
Answer:
The resultant downward force on the top-pan balance is 0.91N.
The best answer from the options is D : The resultant downward force on the top pan balance is 0.91 N
Although your question is incomplete attached below is the complete question.
Given data :
mass of metal block = 100 g
reading on the balance = 91 g
In order to deduce the best statement we will Neglect weight while considering the force acting on the balance ( reading on the balance ). therefore the resultant downward force on the top pan will be
91 g ≈ 0.91 N ( 91 * 0.0098 N )
hence the statement that can be deduced from this experiment is that The resultant downward force on the top pan balance is 0.91 N
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1. What happens when like charges come together?*
Answer:
When like charges come together, they repel each other. For instance, when the north and south poles of a magnet come together, they push each other apart. The like poles in the magnet repel each other and unlike poles attract each other much. The same reaction occurs in like and unlike charges. Also, the repulsion acts along the line between the two charges.
Which of the following is true for a parallel circuit?
Answer:
Will you show the some answers so I can helpTrue or false: a moving object can have a displacement of zero
Answer:
true
Explanation:
the object instead of moving through a distance can have zero displacement. Example: If an object travels from point A and reaches to the same point A, then its displacement is zero.
Answer:
It would be False :)
Explanation:
Hope this helps Have a blessed day! :)
A tiger waits in hiding behind a bush. The tiger spots an impala running past at 10 m/s. At the instant the impala passes the tiger, the tiger accelerates from rest at 4 m/s² to catch the impala. The displacement of the tiger when it catches the impala is --------------.
Please answer.
Answer: the displacement is 50 meters.
Explanation:
We can assume that the initial position of both animals is the same, let's find the position equation for each one of them.
Impala:
We know that its velocity is 10m/s
then the velocity equation is
Vi(t) = 10m/s
For the position equation, we need to integrate over time to get:
Pi(t) = 10m/s*t + C
Where C is the constant of integration and represents the initial position of the impala.
For the Tiger, we know that the acceleration is 4m/s^2, then the acceleration equation is:
At(t) = 4m/s^2
The velocity equation can be found by integrating over time, we get:
Vt(t) = (4m/s^2)*t + V0
Where V0 is a constant of integration and represents the initial velocity of the tiger, we knew that the tiger was at rest, then the initial velocity is zero, and the velocity equation is:
V(t) = (4m/s^2)*t
For the position equation of the tiger we need to integrate over time again, and because both animals have the same initial position, the constant of integration will be equal to C.
Pt(t) = (1/2)*(4m/s^2)*t^2 + C
The tiger will catch the impala when the position of the tiger is the same as the position of the impala, then we need to solve:
Pi(t) = Pt(t)
10m/s*t + C = (1/2)*(4m/s^2)*t^2 + C
We can remove C in both sides to get:
10m/s*t = (1/2)*(4m/s^2)*t^2
Now we can divide both sides by t, to get
10m/s = (1/2)*(4m/s^2)*t
10m/s = (2m/s^2)*t
(10m/s)/(2m/s^2) = t = 5s
The tigger runs for 5 seconds before catching the Impala, knowing this we can find the displacement of the tiger, wich will be the difference between the final position of the tiger, Pt(5s) and the initial position of the tiger Pt(0s)
Displacement = (1/2)*(4m/s^2)*(5s)^2 + C - ((1/2)*(4m/s^2)*(0s)^2 + C)
= (1/2)*(4m/s^2)*(5s)^2 = 50m
The displacement of the tigger is 50 meters.
The relaxation of skeletal muscle fibers and the skeletal muscle, itself, begins with the motor neuron, which stops releasing its
chemical signal, Ach, into the synapse at the neuromuscular junction. The muscle fiber will repolarize. What is the next step in
relaxation?
Answer:Muscle contraction usually stops when signaling from the motor neuron ends, which repolarizes the sarcolemma and T-tubules, and closes the voltage-gated calcium channels in the SR. Ca++ ions are then pumped back into the SR, which causes the tropomyosin to reshield (or re-cover) the binding sites on the actin strands. A muscle also can stop contracting when it runs out of ATP and becomes fatigued (
Explanation:
The force needed to lift an object is equal in size to the gravitational
orce on the object. How much work is done in lifting an object that has a mas
of 5 kg a vertical distance of 2 m?
Explanation:
W.D. = F * s = 50N * 2m = 100J.
is the chorion the yolk of the egg
Answer:
Yes
Explanation:
Inside the egg are a series of fluid-filled membranes that permit the embryo to survive: the amnion, allantois, yolk sac, and chorion. Around the chorion is the albumin or "white" of the egg, and an outer shell protects the whole egg, preventing drying while still permitting air to reach the embryo.
The diagram will help you below:
Explain how radio waves and digital signals will store and transmit this assignment to your instructor.
The radio waves and digital signals will store and transmit through the electromagnetic wave.
What is an electromagnetic wave?EM waves are another name for electromagnetic waves. Electromagnetic radiations are made up of electromagnetic waves created when an electric field collides with a magnetic field.
Electromagnetic waves may alternatively be defined as the combination of oscillating electric and magnetic fields. Maxwell's equations are solutions to electromagnetic waves.
Electromagnetic waves are employed to transfer digital and analogue signals. The music you listen to or the graphics you see on a screen are created by changes in frequency and amplitude.
Hence, electromagnetic waves are used to transfer digital and analogue signals.
To learn more about the electromagnetic wave, refer to the link;
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Is renewable energy just as efficient as fossil fuels?
Answer:
For me
Explanation:
First of all it's more than efficient than fossil fuels
A 6.0 kg bowling ball moving at 3.5m/s to the right makes a collision, head-on, with a stationary 0.70 kg bowling pin. If the ball is moving 2.77 m/s to the right after the collision, what will be the velocity ( magnitude and direction) of the pin?
Answer:
The velocity of the pin will be 6.26 m/s in the right direction.
Explanation:
Let's use the momentum conservation equation.
[tex]p_{i}=p_{f}[/tex]
Initially, we have:
[tex]p_{i}=m_{b}*v_{ib}[/tex]
Where:
m(b) is the ball massv(ib) is the initial velocity of the ballNow, the final momentum will be:
[tex]p_{f}=m_{b}*v_{fb}+m_{p}*v_{fp}[/tex]
Where:
m(p) is the pin massv(fb) is the final velocity of the ballv(fp) is the final velocity of the pinThen, using the equation of the conservation we have:
[tex]m_{b}*v_{ib}=m_{b}*v_{fb}+m_{p}*v_{fp}[/tex]
[tex]6*3.5=6*2.77+0.7*v_{fp}[/tex]
[tex]6*3.5=6*2.77+0.7*v_{fp}[/tex]
[tex]v_{fp}=6.26 m/s[/tex]
Therefore the velocity of the pin will be 6.26 m/s in the right direction.
I hope it helps you!
help with this question.....
Answer:
[tex]g_{moon}=1.67 [m/s^{2} ][/tex]
Explanation:
The weight of some mass is defined as the product of mass by gravitational acceleration. In this way using the following formula we can find the weight.
[tex]w =m*g\\[/tex]
where:
w = weight [N]
m = mass = 0.06 [kg]
g = gravity acceleration = 10 [N/kg]
Therefore:
[tex]w=0.06*10\\w=0.6[N][/tex]
By Hooke's law we know that the force in a spring can be calculated by means of the following expression.
[tex]F=W\\F = k*x[/tex]
where:
k = spring constant [N/m]
x = deformed distance = 6 [cm] = 0.06 [m]
We can find the spring constant.
[tex]k= F/x\\k=0.6/0.06\\k=10 [N/m][/tex]
Since we use the same spring on the moon and the same mass, the constant of the spring does not change, the same goes for the mass.
[tex]F_{moon}=k*0.01\\F = 10*0.01\\F=0.1[N][/tex]
Since this force is equal to the weight, we can now determine the gravitational acceleration.
[tex]F=m*g_{moon}\\g=F/m\\g = 0.1/0.06\\g_{moon} = 1.67[m/s^{2} ][/tex]
HELP SCIENCE WORK ON MOTION DUE!
which correctly lists three main causes of deforestation?
O air pollution,mining, logging
O mining,cattle ranching, logging
O cattle ranching,water pollution, air pollution
O water pollution, logging, mining
Answer:
B. mining, cattle ranching, logging
Explanation:
Took the quiz on edge2020 :)
What is the opposite of dividind hy 3?
Answer:
multiplying by 3.
Explanation:
When you stretch a spring 20 cm past its natural length, it exerts a force of 8 N. What is the spring constant of this spring?
A. 1.5 N/cm
B. 0.4 N/cm
C. 25 N/cm
D. 160 N/cm
Answer:
B. 0.4 N/cm
Explanation:
While stretching a spring 20 cm past its natural length, it exerts a force of 8 N. What is the spring constant of this spring is 0.4 N / cm, the correct option is B.
What is the spring constant?The spring constant is used to define the stiffness of the spring, the greater the value of the spring constant stiffer the spring and it is more difficult to stretch the spring.
The mathematical relation for calculating the spring constant is as follows
F = - Kx
where F represents the Force
x represents the amount of stretch in the spring
K represents the value of the spring constant
For given problem
F= 8 N and x = 20 cm
K = F/x
=8/20 N/ cm
=0.4 N / cm
The spring constant for the spring is 0.4 N/ cm
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