Flashcards should focus on a. Key points c. Both of these b. Bits of information d. None of these Please select the best answer from the choices provided A B C D.
Answer:
c
Explanation:
john and caraline go out for a drive one day. this graph reprresents the distance they travlled over time during what part of time are they not moving.
Explanation:
where is the graph mate ??????
Answer:
hjjjjnbb tuu tui amr sathe vat karu chu ka kya hua tha ki da best
Explanation:
jjjkkk
john and caraline go out for a drive one day. this graph reprresents the distance they travlled over time during what part of time are they not moving.
A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object.
Answer:
The answer is 4 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
where
f is the force
m is the mass
From the question we have
[tex]a = \frac{20}{5} \\ [/tex]
We have the final answer as
4 m/s²Hope this helps you
Explain how heat (thermal energy) can change the motion (kinetic energy) of the particles in objects.
Answer:
Adding heat makes the particles move faster so the particles have more kinetic energy when more thermal energy is added
Explanation:
While vacationing in the mountains you do some hiking. In the morning, your displacement is S⃗ morning= (2200 m , east) + (4000 m north) + (100 m , vertical). Continuing on your hike after lunch, your displacement is S⃗ afternoon= (1300 m , west) + (2500 m , north) - (300 m , vertical).At the end of the hike, how much higher or lower are you compared to your starting point? What is the magnitude of your net displacement for the day?
Answer:
a
The hiker (you ) is 200 m below his/her(your) starting point
b
The resultant displacement in the north east direction is
[tex]a = 6562.0 \ m [/tex]
The resultant displacement in vertical direction (i.e the altitude change )
[tex]b =6503.1 \ m [/tex]
Explanation:
From the question we are told that
The displacement in the morning is [tex]S_{morning} = (2200 \m , east) + (4000\ m\ north) + (100 \ m ,\ vertical)[/tex]
The displacement in the afternoon is [tex]S _{afternoon}= (1300\ m ,\ west) + (2500 \ m ,\ north) - (300\ m ,\ vertical)[/tex]
Generally the direction west is negative , the direction east is positive
the direction south is negative , the direction north is positive
resultant displacement is mathematically evaluated as
[tex](2200 \m , east) +( - 1300\ m ,\ west) = 900 \ m \ east[/tex]
[tex](4000\ m\ north) + (2500 \ m ,\ north) = 6500 \ m ,\ north[/tex]
[tex](100 \ m ,\ vertical) - (300\ m ,\ vertical) = -200 \ m[/tex]
From the above calculation we see that at the end of the hiking the hiker (you) is 200 m below his/her(your) initial position
Generally from Pythagoras theorem , the resultant displacement in the north east direction is
[tex]a = \sqrt{900^2 + 6500^2}[/tex]
=> [tex]a = 6562.0 \ m [/tex]
Generally from Pythagoras theorem , the resultant displacement in vertical direction (i.e the altitude change )
[tex]b = \sqrt{6500^2 +(-200)^2 }[/tex]
=> [tex]b =6503.1 \ m [/tex]
Resistor 1 has twice the resistance of resistor 2. They are connected in parallel to a battery. The ratio of the thermal energy dissipation by 1 to that by 2 is:
The ratio of the thermal energy dissipation by resistor 1 to that by resistor 2 will be 1 : 2
The Resistance of a ResistorResistors can be arranged in series or parallel
The resistors arranged in parallel will have the same potential difference across each every one of them.
Given that Resistor 1 has twice the resistance of resistor 2. They are connected in parallel to a battery. That is
[tex]R_{1}[/tex] = 2[tex]R_{2}[/tex]
Power P = lV
from Ohm's law
V = lR
Make l the subject of formula
l = V/R
Substitute l into power formula
P = [tex]V^{2}[/tex] / R
For the Resistor 1,
P = [tex]V^{2}[/tex] / 2[tex]R_{2}[/tex]
For the Resistor 2
P = [tex]V^{2}[/tex] / [tex]R_{2}[/tex]
The ratio of the thermal energy dissipation by 1 to that by 2 will be
[tex]V^{2}[/tex]/2[tex]R_{2}[/tex] x [tex]R_{2}[/tex]/[tex]V^{2}[/tex]
The [tex]V^{2}[/tex] and the [tex]R_{2}[/tex] will cancel out.
Therefore, the ratio of the thermal energy dissipation by 1 to that by 2 will be 1:2
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A Ford is traveling with a velocity of 15m/s, east, and is 200 m ahead of a Chevy traveling in the same direction at 20 m/s. How far will the Chevy travel before catching up to the Ford? Edit: nvm lol I found it
Answer:
Distance covered by Chevy before catching up to the Ford = 800 meters
Explanation:
From the graph attached,
A Ford starts with a velocity = 15 meter per second
Therefore, slope of the line representing the relation between the distance and time = [tex]\frac{\triangle s}{\triangle t}[/tex] = Velocity
Let the equation of the blue line,
y = m₁t + b
Where m₁ = slope of the blue line = speed of a Chevy
= 20 meter per second
b = y-intercept
y = 20t + 0 [Since, Chevy starts from the origin, b = 0]
y = 20t
Let quation of the red line,
y = m₂t + b
Where m₂ = Slope of the red line = 15 meter per sec
b = y-intercept = 200 m [Since Ford is 200 meters ahead of Chevy]
y = 15t + 200
Point where these lines will meet or the point where both the cars meet.
20t = 15t + 200
5t = 200
t = 40 seconds
Distance traveled by Chevy in 40 seconds = Velocity × Time
= 20 × 40
= 800 meters per seconds
One of two lorries is half the weight of the other, but is moving at twice the speed of the other. Which of the lorries has more kinetic energy?
Need urgently help and please someone offer to help me with this exercise.. Thank you ^-^
Answer:
1 /2 (W / g) V^2 = KE1
1/2 *(W / 2) / g * (2V}^2 = KE2 = 1/2 (W / 2 ) g * 4 V^2
KE2 / KE1 = 2
The lorry traveling at twice the speed has twice the KE
4 times energy due to speed but 1/2 the mass
Lorry 2 has more kinetic energy than Lorry 1.
To compare the kinetic energy of the two lorries, we use the formula for kinetic energy:
Kinetic Energy (KE) = 1/2 * mass * [tex]velocity^2[/tex]
Let's assume the following:
Lorry 1 (L1) has a mass of M kg and a velocity of V m/s.
Lorry 2 (L2) has a mass of half of L1's mass, so its mass is (1/2)M kg, and it has a velocity of 2V m/s.
Now, let's calculate the kinetic energy for each lorry:
For Lorry 1 (L1):
KE1 = 1/2 * M * [tex]V^{2}[/tex]
For Lorry 2 (L2):
KE2 = 1/2 * (1/2)M * [tex](2V)^2 = 1/2 * (1/2)M * 4V^2 = 2 * (1/2 * M * V^2) = 2 * KE1[/tex]
From the calculations, we can see that the kinetic energy of Lorry 2 (KE2) is double the kinetic energy of Lorry 1 (KE1).
So, even though Lorry 2 is moving at twice the speed of Lorry 1, its kinetic energy is higher because it also has half the weight (mass) of Lorry 1. The increased speed of Lorry 2 contributes more to its kinetic energy than the decrease in mass.
Therefore, Lorry 2 has more kinetic energy than Lorry 1.
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A force that resists two objects rubbing together is called _____.
OA) heat
OB) friction
OC) kinetic energy
OD) potential energy
Answer:
B
Explanation:
Friction is the force used to prevent 2 objects from rubbing against each other. This would mean if you rubbed your hands together you would feel the heat from the force of friction against the 2 objects namely your hands. Some things mitigate friction like water and soap. Water commonly used in waterslides reduces friction since the properties of water reduces the friction so much that you would be able to slide smoothly. This happens since wet object don't makes hard surfaces smooth. Soap does the same thing since the two objects are more slippery and can seem to get a grip on each other for friction. I hope this helps with your question thanks you and cya!
Why Newton's Law of cooling not applicable for higher temperature differences?
Newton's Law of Cooling is a simplification based on the assumption that the rate of energy flow is proportionate to the temperature difference.
Radiative energy flow becomes essential at very high temperature differences, and this is proportional to the difference in temperatures raised to the fourth power.
Drag each label to the correct location.
The atomic number and the mass number of atoms relate to their numbers of protons and neutrons. Use what you know
about mass numbers and atomic numbers to complete the table.
Name
Atomic Number
Number of
Protons
Number of
Neutrons
Mass Number
helium
2
2
4
carbon
6
6
12
les
oxygen
8
8
16
sodium
11
11
12
chlorine
17
17
35
Answer:
Atomic Mass number of helium is 4.0
Atomic mass number of carbon 12.0107
Answer:
this is from edmentum.
Explanation:
Human eye forms an ____________ image on _________after passing through the lens
Answer:
inverted images
retina
Answer:
I hope the answer may help you
10. A cyclist travels at 15m/s for 4 minutes. How far does she go?
Answer:
15*4=60
Explanation:
you would multiply
what is the relationship between magnets and emf
Answer:
Movement of a magnet relative to a coil produces emfs as shown. The same emfs are produced if the coil is moved relative to the magnet. The greater the speed, the greater the magnitude of the emf, and the emf is zero when there is no motion.
Hope this helps!
Define heat capacity of a substance.
Write the S.I unit of heat capacity.
Define heat capacity of a substance:
The heat capacity of a substance can be defined as the amount of heat required to change its temperature by one degree.Write the S.I unit of heat capacity:
Joule per Kelvin[tex] \: \: \: [/tex]
Joule per Celsius[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
[tex] \: \: \: [/tex]
-,-
23. Which of the following substances could
be expected to provide the greatest relief
for an acid stomach?
(1) bottled spring water
(2) baking soda in water
(3) lemonade
(4) salt water
(5) strong coffee
Answer:
(2) baking soda in water
Explanation:
The substance could be expected to provide the greatest relief for an acid stomach is baking soda in water. The correct option is (2).
What is baking soda?Baking soda, also known as sodium bicarbonate is a popular ingredient for baking purpose. It helps giving foods like bread, cakes, muffins, and cookies a light and fluffy texture.
When a person has a bloated stomach, he has to take in some soda in anyways to relief.
Soda can be taken as ENO or soda flavored from soda shops.
So, one must take baking soda in water to provide the greatest relief
for an acid stomach
Thus, the correct option is (2).
Learn more about baking soda.
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Select the correct answer. What do scientists use to determine the temperature of a star? A. Thermometer B. Distance from Earth C. Composition D. Color.
Answer:
Color
Explanation:
Thus, for stars, considering them as “black bodies”, we can get an approximate figure for their temperature by measuring their dominant frequency (color). Technically scientists measure the brightness of the blue light and that of red light from the star, and from this they can calculate the temperature of the star.
Answer: color answer D
Explanation:
If an object has two forces acting on it, how can the net force equal zero?
Physical Science
Answer:
If they have the same net force
Explanation:
Explanation: The net force is the total amount of force acting on an object. It becomes 0 when the forces are equal, canceling each other out (or balancing them - same thing).
A sound wave is produced when a medium begins to .
A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.
What is a sound wave?When an object vibrates, a pressure wave is created, which produces sound. The particles in the surrounding medium (air, water, or solid) vibrate as a result of the pressure wave.
The vibrations of the particles move nearby particles, allowing the sound to travel further through the medium.
Hence a sound wave is produced when a medium begins to vibrate.
To learn more about the sound wave refer to the link;
https://brainly.com/question/11797560
Answer:
vibrate
Explanation: slaaauyy
15 PLEASE HELP
Nora rides a bicycle for 5 min on a curvy road
at a constant speed of 10 m/s. Describe Nora's
ride in terms of position, velocity, and
acceleration. Compare the distance she rides
and her displacement.
Answer:
Ok, her position changed over time since the road is curved.
The velocity changed since the direction is changing
AccelerTion: theres a change in velocity since the direction changes
Direction: changed over time
Displacement : difference between 1st and final position
Explanation:
Displacement : difference between 1st and final position
What is Displacement?Displacement is defined as the change in position of an object. It is a vector quantity and has a direction and magnitude.
Ok, her position changed over time since the road is curved.
Accelertion: theres a change in velocity since the direction changes
Nora's ride in terms of position is 10*5*60 = 3000 meter is position
Displacement : difference between 1st and final position.
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Which set of terms is in the proper order, from left to right, for labeling the
reactants and products in this reaction?
A sound wave is produced when a medium begins to.
Explanation:
Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.
I hope you understand...
can you please mark my answer brainliest ♥️...
Answer:
vibarate
Explanation:
Calculate the momentum on an object that has a mass of 150 kg and a velocity of 24 m/s no decimal in your answer
Question :-
Calculate the Momentum of an object that has a mass of 150 Kg and a Velocity of 24 m/s .Answer :-
Momentum is 3600 Kg m/s .Explanation :-
As per the provided information in the given question, we have been given that the Mass of the object is 150 Kg . Its Velocity is given as 24 m/s . And, we have been asked to calculate the Momentum of object .
For calculating the Momentum , we will use the Formula :-
[tex] \bigstar \: \: \boxed{ \sf{ \: Momentum \: = \: Mass \: \times \: Velocity \: }} [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \dag \: \: \: \sf { Momentum \: = \: Mass \: \times \: Velocity } [/tex]
[tex] \longmapsto \: \: \sf { Momentum \: = \: 150 \: \times \: 24 } [/tex]
[tex] \longmapsto \: \textbf {\textsf { Momentum \: = \: 3600 \: Kg m/s }} [/tex]
Hence :-
The Momentum of the object is 3600 Kg m/s .[tex] \underline {\rule {180pt} {4pt}} [/tex]
What are the Fundamental units involved in pressure
Answer:
density and volume
Explanation:
density and volume
What is the gravitational potential energy of the tennis ball at position A?
Will give brainliest!
Find the uniform acceleration that causes a car's velocity to change from 20.0 m/s to 105 m/s in and 12.0 s
period.
Answer:
7.08 m/s²
Explanation:
Given:
v₀ = 20.0 m/s
v = 105 m/s
t = 12.0 s
Find: a
v = at + v₀
105 m/s = a (12.0 s) + 20.0 m/s
a = 7.08 m/s²
An object accelerates from rest to 35m/s over distance of 36 m . What acceleration did it experience
Acceleration : 17.01 m/s²
Further explanationLinear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration
• An equation of uniformly accelerated motion
vf = vo + at
vf² = vo² + 2a (x-xo)
x = distance on t
vo / vi = initial speed
vt / vf = speed on t / final speed
a = acceleration
[tex]\tt vf^2=vo^2+2ax\rightarrow vo=0\rightarrow rest\\\\35^2=0^2+2.a.36\\\\1225=72.a\\\\x=17.01~m/s^2[/tex]
A soccer ball is kicked horizontally off a 24.0 meter high hill and lands a distance of 33.0 meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.
Answer:
ten minutes fakfdxjjnox
Answer:
Question:
A soccer ball is kicked horizontally off a
22.0
meter high hill and lands a distance of
35.0
meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.
Projectile:
The projectile motion is a combination of uniform motion and uniform acceleration motion. When an object is thrown with a velocity (v) then, the horizontal component of the velocity (
v
h
) does not change with respect to time and therefore, the following relation holds valid for the horizontal motion:
S
p
e
e
d
=
S
p
e
e
d
T
i
m
e
The vertical component of the velocity (
v
v
) changes at the rate of
g
=
9.81
m
/
s
2
and therefore, the equations of motion are used to study the vertical motion of the object. These equations are customized for the vertical motion as:
v
=
u
+
g
t
s
=
u
t
+
0.5
g
t
2
v
2
−
u
2
=
2
g
s
For an object thrown with a horizontal velocity, the initial vertical component of the velocity will be zero. In that case, the vertical distance traveled by the object in time (t) will be,
s
=
0.5
g
t
2
⇒
t
=
√
2
s
g
Answer and Explanation:
Given:
Height of the hill,
H
=
22
m
The horizontal distance covered by the ball before it lands,
d
=
35
m
Calculating the time taken by the ball to hit the ground,
t
=
√
2
H
g
=
√
2
(
22
)
9.81
=
2.12
s
Calculating the initial horizontal velocity of the ball,
V
=
d
t
=
35
2.12
=
16.51
m
/
s
which is the answer.
Explanation:
challenge
3. A car accelerates at a constant rate from 15 m's to 25 m/s while it
travels a distance of 125 m. How long does it take to achieve the final speed?
Answer:
6.25 second
Explanation:
we know that
s= (u+v)/2*T
125=20t
t=6.25 second
plz mark as brainalist
Please help me with this
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PLSSSS
Answer:
A
Explanation:
Car A started at 15 Mph but took 20 seconds to get to 35 Mph. Car B only took 15 seconds to get to 35 Mph even though it started slower.
Answer:
A
Explanation:
Car A had the best initial acceleration by more than 5 mph, while Car B reached the desired speed in 15 seconds, compared to 20 seconds.