Answer:
It does not hit the students face because the speed of the balloon slows down as energy is lost through thermal.
Explanation:
The coefficient of kinetic friction between a couch and the floor is 0.65. If the
couch has a mass of 42 kg and you push it with a force of 600 N, what is the
net force on the couch as it slides?
A. 868 N
B. 188 N
C. 452 N
O D. 332 N
Answer: D. 332n
Explanation: I took the quiz and that was the correct answer
1. In the context of the poem, what does it mean to feel alone? How can two people experience isolation despite living in the same home and being in the same relationship? What effect does one’s expectations of a relationship have on feelings of isolation?
hello
Explanation:
I haven't read the poem because you didn't attach it but here is my go at answering the question- although we find it hard to imagine being lonely while with others... if you lack emotional or intellectual connection even being physically near someone you are not mentally there
Describe how reactivity changes as you go down Group 1A.
Answer:
it is a the answer is a btw
Explanation:
can u give me the answers to this?
Answer:
Hope this helps.
Explanation:
Let's start b writing down coordinates of all points:
A(0,0,0)
B(0,5,0)
C(3,5,0)
D(3,0,0)
E(3,0,4)
F(0,0,4)
G(0,5,4)
H(3,5,4)
a.) When we reflect over xz plane x and z coordinates stay same, y coordinate changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.
A(0,0,0)
Reflecting
A(0,0,0)
B(0,5,0)
Reflecting
B(0,-5,0)
C(3,5,0)
Reflecting
C(3,-5,0)
D(3,0,0)
Reflecting
D(3,0,0)
b.)
A(0,0,0)
Moving
A(-2,-3,1)
B(0,-5,0)
Moving
B(-2,-8,1)
C(3,-5,0)
Moving
C(1,-8,1)
D(3,0,0)
Moving
D(1,-3,1)
How long would it take for someone to bike to school if the school is 10 km away and the
cyclist is riding at 5 km/hr
Answer:
It would take the cyclist 2 hours to cycle to school.
Explanation:
5km/hr for 2 hours would be 10km.
What is the form of energy that our eyes can detect?
A. Sound Energy
B. Chemical Energy
C. Light Energy
D. Thermal Energy
Answer: C. Light energy.
Explanation:
what property do protons can electrons have that neutrons do not ?
Answer:
Protons and electrons are charged particles. Neutrons have no charge.
An arrow is projected by a bow vertically up with a velocity of 40 m/s, and reaches a target in 3 s. What is the velocity of the arrow just before it hits the target? How high is the target located?
Answer:
Explanation:
Step one:
given data
initial velocity u= 40m/s
time taken t=3seconds
final velocity v=?
Step two:
applying the first equation of motion
v=u-gt--- (the -ve sign implies that the arrow is against gravity)
assume g=9.81m/s^2
v=40-9.81*3
v=40-29.43
v=10.57m/s
Step three:
how high the target is located
applying
s=ut-1/2gt^2
s=40*3-1/2(9.81)*3^2
s=120-88.29/2
s=120-44.145
s=75.86m
When a toy car is moving across a flat surface, what forces are acting on it (gravity, tension, spring, friction,air,normal,applied)?
Answer:
I believe gravity is acting on it
What is the velocity of galaxy mice
Explanation:
Both galaxies show bicones of high ionisation gas extending along their minor axes. In NGC 4676A the high gas velocity .
please. follow. me
which instrument is used to compare the mass of a balance
Answer:
balance is tha answer hope it us helpful
Explanation:
for most everyday objects scientist use a balance to obtain an object mass .A Balance compares an object with a known mass to object the question
pls help me this is being timed. pls.
Answer:
10N each
Explanation:
Doing a little math here to make it balanced. 10+10=20 therefore you have the same on both sides.
Hope this helps!
how can gravitational energy play an important part of my life
Answer:
Explanation:
Well, lets say you park your car on the top of a hill, gravitational energy prevents it from the car falling back. Or a snow pack, aka before a potential avalanche. Though gravity cannot keep it safe forever, gravitational energy keeps it from crashing asap. In this case, it gives you time to escape. Altogether, gravitational force keeps the earth in it's atmosphere.
Geological and atmospheric changes happening over a ______ time scale can cause______ extinctions.
Fill in the blanks folks..
Answer:
Long short
Explanation:
1
Dogs that are bigger are selected to be parents.
2
The parents are bred together, and their offspring will be different sizes.
3
The biggest offspring will be selected and bred together.
4
This cycle continues until the dogs have been selectively bred to be bigger than the current world record size.
5
Selective breeders need to ensure that they are not also selecting for disadvantageous traits, like genetic limb defects.
Ur gonna need this...
Brainliest plzzz..thanks..sorry Messy
Answer:
Geological and atmospheric changes happening over a long time scale can cause short extinctions.
Explanation:
With Christmas lights wired in series, if one light goes out, what happens to the rest?
Answer:
The ones that are after the light that went out are also out.
Explanation:
Answer:
they all go out
Explanation:
they are wired together so they all go out. i am an electrician.
3 difference between weather and climate
weather is everyday things
weather could be a hurricane
weather could be a tornado
climate is more long term over time
example the climate in Antarctica is cold because it happens over long periods overtime
Speed is determined based on two factors. What are they
Answer:
distance and time
Explanation: the farther you go and how much time it will take you
How do you calculate the potential energy by it's height and weight? and is there any other way to solve it?
Answer:
PE = mgh
Explanation:
m is mass, g is gravitational constant (9.81) and h is height
A 70 kg box undergoes a horizontal acceleration of 3.0 m/s^2 on a level surface when pulled by a 130 N force, What is the coefficient of kinetic friction between the box and the surface?
I think there's a typo in the question...
Vertically, the box is in equilibrium, so its weight and the normal force (magnitudes w and n, respectively) are such that
n + (-w) = 0
The box has mass 70 kg, and assuming gravitational acceleration with magnitude g = 9.80 m/s², it has a weight of
w = (70 kg) g = 686 N
and hence
n = 686 N
Horizontally, the box is accelerated 3.0 m/s², so the net force acting on it is
∑ F = (70 kg) (3.0 m/s²) = 210 N
and the only forces acting in this dimension are the pulling force with magnitude 130 N and the friction force with magnitude f so that
130 N - f = 210 N
The friction force is proportional to the normal force by a factor of µ, the coefficient of kinetic friction, so that
f = µ n
and so we have
130 N - µ (686 N) = 210 N → µ ≈ -0.117
but µ can't be negative!
The problem is that the pulling force should have a magnitude larger than that of the net force, so either the given mass, acceleration, or pulling force are incorrect.
An object takes 5 seconds to travel 25 meters. What is its speed?
Answer:
5m/s is the answer s=d/t 25/5=5m/s
Answer:
5m/s
Explanation:
The formula for speed is s=distance/time. The distance traveled was 25 meters. The time it took to travel that distance was 5 seconds. Therefore, s= 25m/5s to give an answer of 5 m/s
Since sound is a mechanical wave it needs a ...... to travel through
Answer:
medium
Examples:
A medium is a thing that the sound wave would travel through, like sound waves traveling through air. A mechanical wave cannot travel without a medium, like if the wave were trying to travel through a vacuum.
a student's blaring trumpet
Is what type of energy
Answer:
a blaring trumpet is sound energy
Explanation:
what do electrons move from
Answer:
Negatively charged, to positively charged parts
Explanation:
Electrons are negative, negative is attracted to positive.
why is it better to hold a musical events or programs in the evening?
Answer:
sound travels faster in the night
Explanation:
Which object might have the pattern of magnetic domains shown in the
image?
114 114
114 114
11 11
A. Cotton fabric near a magnet
O B. A piece of iron, not near a magnet
O C. A piece of iron near a magnet
D. Cotton fabric, not near a magnet
Answer: a piece of iron near a magnet
Explanation:
A coin released at rest from the top of a tower hits the ground after falling 1.5 s. What is the speed of the coin as it hits the ground? (Disregard air resistance. a = −g = −9.81 m/s 2 .)
Initial speed of the coin (u)= 0 (As the coin is released from rest)
Acceleration due to gravity (a) = g = 9.81 m/s²
Time of fall (t) = 1.5 s
From equation of motion we have:
[tex] \boxed{ \bf{v = u + at}}[/tex]
By substituting values in the equation, we get:
[tex] \longrightarrow [/tex] v = 0 + 9.81 × 1.5
[tex] \longrightarrow [/tex] v = 14.715 m/s
[tex] \therefore [/tex] Speed of the coin as it hits the ground/Final speed of the coin = 14.715 m/s
The speed of the coin as it hits the ground is 14.715 m/s.
We can solve the problem above using the equation of acceleration under gravity.
⇒ Equation:
v = u+gt................... Equation 1
⇒ Where:
The final velocity of the coinu = Initial velocity of the coing = acceleration due to gravityt = timeFrom the question,
⇒ Given:
u = 0 m/s (from rest)t = 1.5 sg = -9.81 m/s²Substitute these values into equation 1
v = 0+1.5(-9.81)v = -14.715 m/sNote the speed has a negative sign because it acts in the same direction as the acceleration due to gravity
Hence, the speed of the coin as it hits the ground is 14.715 m/s.
Learn more about gravitational motion here: https://brainly.com/question/17785701
Which of the following is true about the speed of light? (2 points)
Answer:
It is a constant when the light is traveling in a vacuum.
Un ciclista A marcha a 24 Km/h y un ciclista B se desplaza a 6,8 m/s, Ambos están ubicados en un camino que tiene 4 Km de largo, pero el ciclista A está ubicado en el inicio del camino y el ciclista B está a 500 metros después. Conteste: a) Cuál de los dos ciclistas se desplaza a mayor velocidad b) Cuánto tiempo demora cada ciclista en llegar al extremo final del camino
Answer:
(a) Cyclist A travels faster.
(b) The time taken by cyclists A and B is 10 minutes and 8.58 minutes respectively.
Explanation:
Given that the speed of cyclist A= 24 km/h
As 1 km = 1000 m and 1 hour= 3600 seconds.
So, [tex]24 \frac {km}{h}=24\times \frac{1000 m}{3600 s}=\frac{20}{3}\frac {m}{s}=6.67 m/s[/tex]
and the speed of cyclist B = 6.8 m/s.
The length of the road = 4 km=4000 m.
(a) Speed of cyclist A is 6.67 m/s which is more than the 6.8 m/s.
Hence, cyclist A travels faster.
(b) If d be the distance to be traveled and V be the speed, than the time, t, required is,
[tex]t=\frac{d}{V}\cdots(i)[/tex]
For cyclist A:
As A is located at the beginning of the road, he has to cover full length of the road.
So, the distance to be covered by cyclist A =4 km.
Hence, from equation (i), the time taken by cyclist A is
[tex]t=\frac{4}{24}=\frac{1}{6}[/tex] hour
[tex]=\frac{1}{6}\times {60}=10[/tex] minutes. [ as 1 hour = 60 minumes]
So, time taken by cyclist A is 10 minutes.
For cyclist B:
As B is located 500 meters later from the beginning of the road, he has to cover the remaining length of the road.
So, the distance to be covered by cyclist B =4000 m-500 m= 3500 m.
Hence, from equation (i), the time taken by cyclist B is
[tex]t=\frac{3500}{6.8}=514.71[/tex] seconds
As 60 seconds= 1 minute.
So, t= 514.71/60 minutes = 8.58 minutes.
[tex]=\frac{1}{6}\times {60}=10[/tex] minutes. [ as 1 hour = 60 minumes]
So, the time taken by cyclist B is 8.58 minutes.
If two negatively charged small sphere, one with twice the charge of the other, are 18cm a part in air. Calculate the charge on each if the force exerted by each on the other is 0.00081?
Answer:
q₂ = 3.81 x 10⁻⁸ C = 38.1 nC
q₁ = 7.63 x 10⁻⁸ C = 76.3 nC
Explanation:
The force between two charges is given by Coulomb's:
F = kq₁q₂/r²
where,
F = Force = 0.00081 N
k = Coulomb's Constant = 9 x 10⁹ Nm²/C²
q₁ = magnitude of 1st charge
q₂ = magnitude of second charge
r = distance between charges = 18 cm = 0.18 m
Therefore,
0.00081 N = (9 x 10⁹ Nm²/C²)q₁q₂/(0.18 m)²
q₁q₂ = (0.00081 N)(0.18 m)²/(9 x 10⁹ Nm²/C²)
q₁q₂ = 2.916 x 10⁻¹⁵ C²
q₁ = 2.916 x 10⁻¹⁵ C²/q₂ --------------- equation (1)
It is given that:
q₁ = 2q₂ --------------- equation (2)
Comparing equation (1) and equation (2):
2q₂ = 2.916 x 10⁻¹⁵ C²/q₂
q₂² = 2.916 x 10⁻¹⁵ C²/2
q₂ = √14.58 x 10⁻¹⁶ C²
q₂ = 3.81 x 10⁻⁸ C = 38.1 nC
using this value in equation (2):
q₁= 2(3.81 x 10⁻⁸ C)
q₁ = 7.63 x 10⁻⁸ C = 76.3 nC
How does wheel and axle work ?
Answer:
This system uses angular momentum and torque to do work on objects, typically against the force of gravity. The wheel and axle simple machine is closely related to gears.
