Answer:
a picture on a wall. because it's not moving
A see-saw is balanced on a pivot with two children on it. One child is sitting 1.5 m to the left of the pivot and has a mass of 50 kg. Another
child of mass 30 kg is sitting on the right hand side of the pivot. What distance away from the pivot is the child on the right of the pivot?
a) 30 cm
b) 1.5 m
c) 2.5 m
d) Impossible to say without knowing the length of the see-saw
If an object is not turning, the total clockwise moment, compared to the total anti-clockwise moment about any pivot, must be what?
a) Clockwise moment is twice as large as anti-clockwise moment
b) Clockwise moment is three times as large as anti-clockwise moment
c) Clockwise moment is half as large as anti-clockwise moment
d) Clockwise moment is exactly equal in magnitude to the anti-clockwise
moment
Answer:
Explanation:
Remark
This is a second class lever. It is much more efficient than the fishing pole problem. All distances are measured from the pivot in these kinds of questions.
Givens
d1 = 1.5
d2 = ?
m1 = 50 kg
m2 = 30 kg
The lighter child will have to sit further away from the pivot to make the two conditions equal.
Formula
d1*m1 = d2*m2
1.5*50 = d2 * 30
75 = 30 * d2
75/30 = d2
d2 = 2.5
Remark
Notice that the distance is longer for the lighter child. The fact that these are masses and not forces does not matter, but you should take note of it. There is a difference between masses and forces. See the fishing pole problem.
Answer to the multiple Choice question. No motion on this kind of problem means equal moments. The answer is D
Problem 2
1) The wheels are further apart making B more stable. The wider the distance the wheels are apart, the harder it would be to tip the concrete mixer over
2) The center of gravity is lower. The higher the force is the more chance you have of exerting an external force to tip the mixer over.
Can someone help me answer this pls I’ll give brainliest
Answer: I think the answer is Non-foliated if it is wrong i am so sorry
don't forget to drop a heart.
Explanation:
help me please Am I correct???
Answer:
They both experienced the same force as they weigh the same amount
Newtonian physics
Explanation:
Help me please....
Fill in the blanks:
1. Time taken by an object to complete one oscillation is called
Answer:
1) Time period
2) amplitude
3) Hertz or hz
4) Noise
5) frequency
6) infrasonic and ultrasonic
7) solid liquid and gas
8) A man
9) energy
10)1 vibration per minute
Answer: Time taken by an object to complete one oscillation is called time PERIOD.
Explanation:Hope this helps!! Brainlist?plz I need it
Even though this region is gaseous, it is regarded as the Sun’s surface because at this point, light from the Sun is finally able to ________________________ .
a
get warm
b
turn into a liquid
c
escape into the solar system
d
to turn into a solid
An open pipe on an organ creates
a fundamental frequency at
10500 Hz. How long is the pipe?
Answer:
L = 1.61 cm
Explanation:
The frequency of open organ pipe is given by :
[tex]f=\dfrac{nv}{2L}[/tex]
Where
n = 1 for fundamental frequency
f = 10500 Hz
L is the length of the pipe
v is the speed of sound, v = 340 m/s
So,
[tex]L=\dfrac{nv}{2f}\\\\L=\dfrac{1\times 340}{2\times 10500 }\\\\L=0.0161\ m\\\\or\\\\L=1.61\ cm[/tex]
So, the length of the pipe is 1.61 cm.
Answer:
0.0163
Explanation:
acellus
A boy of mass, m weights 895 N. What is his mass, m?
Answer:
91.3 kg
Explanation:
weight = m*g
m: mass
g: gravity = 9.8 or 10 (depends on what your instructor tells you to use)
mass = w/g
895/9.8 = 91.3 KG
what is the color of photosynthesis?
Answer:
Green
Explanation:
Green plants have the ability to make their own food. They do this through a process called photosynthesis, which uses a green pigment called chlorophyll. A pigment is a molecule that has a particular color and can absorb light at different wavelengths, depending on the color
Momentum/Impulse Test- Physics
Name
Momentum: p = mv Change in momentum: Ap = m(vrv.) Impulse: J = Fat Fat = m(vrv)
Elastic collsions: m,Vu+m;V;= m Va+m_V21
Inelastic collisions: m, Vy+m V2 = (m+m),
1. Which object would have the least momentum? Which object would have the most momentum
A. 10Kg object moving at 40m/s
C. .1Kg object moving at 1000m/s
B. 2kg object moving at 100m/s
D. 800Kg object moving at 1m/s
2. Impulse is defined as
A. the change in momentum
B. force multiplied by the change in time
C. the change in velocity
D. both A and B
E. A, B, and C
3. You stick a firecracker between two empty coke cans, each with mass .01kg, and explode it. What is the
total momentum of the system after the collision?
A. 1000 kgm/s
B. Not enough information to tell
C. Depends on the size of the firecracker
D. The answer is 0. Choose this one; none of the other answer choices are correct!
Answer:
Thats a lot, good luck!<3
The mass of the motorbike and rider is 286 kg. Calculate the acceleration of the motorbike at this moment in time.
Answer:
[tex]a=4.03\ m/s^2[/tex]
Explanation:
Given that,
The mass of the motorbike and rider is 286 kg.
We need to find the acceleration of the motorbike at this moment in time.
Net force acting on the bike is given by :
F = 2000 N - 845 N = 1155 N
Let a be the acceleration of the motorbike. So,
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{1155}{286}\\\\a=4.03\ m/s^2[/tex]
So, the acceleration of the motorbike is [tex]4.03\ m/s^2[/tex].
explain Newtons Laws
1) Newton first law of motion: state“If a body is at rest it reamain at rest and if it is in a motion it continu its motion unless a net external force acting on it”
This law also called law of inertia
2) Newton second law of motion: states that ‟acceleration to the force acting on the body and inversky proportional to the mass of the body”
3) Newton's third law of motion: It is not possible to exert a force abody with out the body exerting a forces in the opposite direction.
These forces are called action and reaction forces
hope it's helpful ❤❤❤❤❤❤
THANK YOU.
In the following graph , what is the object’s average velocity?
Answer:
according to the graph, vavg= Stotal/Ttotal =10
Please help :)
Work out the current through a television with a power of 0.8kw if it uses 230v mains supply. Give your answer to 1 decimal place.
Answer:
3.5 A
Explanation:
Current [A] =Electrical power [W] ÷ Potential difference [V]
KW TO W = ×1000
hence,
800W÷230V= 3.5A (1 d.p)
The current through a television with a power of 0.8kW if it uses 230V mains supply is 3.5A
Current is as a result of the flow of electrons through a conductor.
Voltage is the difference in potential between two points.
Power is the product of current and voltage. It is given by:
Power(P) = Current(I) * Voltage(V)
Given a power of 0.8 kW = 800W, V = 230 V. Hence:
P = IV
800 = 230I
I = 3.5A
The current through a television with a power of 0.8kW if it uses 230V mains supply is 3.5A
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A 2.75 kg block is pulled across a flat, frictionless floor with a 5.11 N force directed 53.8° above horizontal. What is the total force acting on the block? (total force = N)
Answer:
F = 3.01 N
Explanation:
Given that,
Mass of a block, m = 2.75 kg
Force applied to the block, F = 5.11 N
It is directed 53.8° above horizontal.
We need to find the total force acting on the block. The force acting on it is given by :
[tex]F=F\cos\theta\\\\F=5.11\times \cos53.8\\F=3.01\ N[/tex]
So, 3.01 N of force is acting on the block.
3.01 works as the right answer
What is the mechanical advantage of an inclined plane that has a length of 9 feet and a height of 3 feet?
0.3
3
6
27
Answer:
it would be 3
Explanation:
because you have to divide the length by the height of the incline.
The mechanical advantage of an inclined plane that has a length of 9 feet and a height of 3 feet will be 3.
What is the mechanical advantage?Mechanical advantage is a measure of the ratio of output force to input force in the system, it is used to obtain the efficiency of a mechanism.
The formula for the mechanical advantage of the inclined plane is found as;
[tex]\rm Mechanical \ advantage = \frac{length}{height} \\\\ Mechanical \ advantage =\frac{9}{3} \\\\ Mechanical \ advantage =3[/tex]
Hence the mechanical advantage of an inclined plane that has a length of 9 feet and a height of 3 feet will be 3.
To learn more about the mechanical advantage refer to the link;
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Helpp!! Pick all the apply
Answer:
extension at the elbow, abduction of the shoulder
Explanation:
i think thats it im not sure hopefully it helps
A car is travelling to the right with a speed of 40 m/s when the driver slams on the brakes. The car skids for 4 s with constant acceleration before it comes to a stop. What was the rate of the car's acceleration as it skidded to a stop?
Answer:
10m/s^2
Explanation:
Given data
velocity= 40m/s
time= 4 seconds
Acceleration a =????
We know that
a= velocity/time
substitute
a=40/4
a= 10m/s^2
Hence the acceleration will be 10m/s^2
I need help with thissss
Explanation:
back ground radiation is a natural radiation so basically everything emits background radiation. so if it were harmful, the world wouldn't be here,
so it is false
it knocks electrons out of atoms, this is because ionising radiation is a radiation that had enough energy to remove electrons form the atoms and molecules.
true because exposure to radon can damage biological molecules such as proteins, which leads to abnormal patterns of cell division, which leads to cancer.
hope it is helpful, if not , you can report and let someone else try it out.
do vote, thank you
New seafloor is being created at point ______________.
1. X
2. Y
3. Z
4. None
Answer:
Point x I think
Explanation:
The law of conservation of energy only applies to what type of
systems?
all systems
open systems
closed systems
System of the Down
All objects in the universe are attracted to each other by the force of. A. effort
B. friction
C. inertia
D. gravity*
Answer:
It encapsulates the idea that all the particles of matter in the universe attract each other through the force of gravity – Newton's law tells us how strong that attraction is. ...
Explanation:
your answer
Answer:
So, I noticed that somebody rated the other answer here 1 star. But, if you really can't get it, (which doesn't make sense because the answer is literally in it) the answer is gravity. Which would make the answer D. gravity
Explanation:
A truck has a velocity of 25 m/s and a momentum of 25.000 kg*m/s. What is its
mass?
Answer:
1000kg
Explanation:
We can use the equation "p=mv"
p is the momentum in kg m/sm is the mass measured in kgv is the velocity measured in m/sIf we rearrange the equation to find mass (m), then the equation becomes:
m=p/v
We can substitute in the values of p and v as they are already given in the question.
p=25,000 kg m/sv= 25 m/sSo, now we just substitute in the values to get our answer.
m=p/v
m=25,000/25
m=1000kg
Which has more momentum a 100 kg kid riding a bike 10m/s or a 5000 kg truck barley rolling at 0.1 m/s
Answer:
The momentum of bike is more.
Explanation:
Given that,
Mass of the kid, m = 100 kg
Speed of the bike, v = 10 m/s
The momentum of the kid is given by :
p = mv
So,
p = 100 kg × 10 m/s
p = 1000 kg-m/s
Mass of the truck, m = 5000 kg
Speed of the truck, v = 0.1 m/s
The momentum of the truck is given by :
p = 5000 kg × 0.1 m/s
= 500 kg-m/s
So, the momentum of the kid riding a bike is more than that of the truck.
An object with a mass of 3 kg is placed at a height of 2m. What is the potential energy of the object to the nearest whole number?
Answer:
the nearest whole number is 5
A boy of mass, m weights 895 N. What is his mass, m?
a) 895 kg
b) 8.95 kg
c) 89.5 kg
d) None of the above
Answer:
One: either C or D. I can't give you a definite answer. See below.
Two: D
Explanation:
One
F = m * a
F = 895 N
a = 9.8
m = F/a
m = 895/9.8
m = 91.82
This turned out to be a very nasty little question. I don't know how you should answer it. The closest answer is C but is it close enough? You have to decide if you've had approximation questions before. If you have, C is the answer. If not then D is what you should choose.
Two
The answer is III and IV which makes it D
could the half of the moon that faces the earth ever be completely dark in any of these diagrams
yes could the half of the moon that faces the earth ever be completely dark
what is moon rotation ?The moon is the captivating celestial body that can be observed through eyes, it is the biggest heavenly body in the night sky which changes its shape constantly.
The waning and waxing of moon cause the changes in face of the moon. The waning and waxing of the moon is directly related to the rotation of the moon.
The rotation of the moon is an extraordinary occurrence as the time the moon takes for completely orbiting the earth is exactly the time it takes to rotate once on its own axis.
Both the actions take 27.3 days to complete. This is unique feature of the moon is rare when compared to other celestial bodies. The energy given to the moon comes from Earth's rotation and to compensate, our planet is slowing down.
For more details regarding moon, visit
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100 POINTS!!!!! YES,!!!!!!!! I SAID !!!!!!!100 POINTS!!!!!!!! FIRST TO ANSWER IT CORRECTLY AND ILL GIVE BRAINLY (LOOK IN THE TWO PICS TO FIND AND THE CORRECT ANSWERS)!!!!!!!!
"thanks for the points!!! and have a (terrible) day" - puppetasap4 :)
Answer:
"thanks for the points!!! and have a (terrible) day" - puppetasap4 :)
Explanation:
6. Most organizations have not banned the use of performing enhancing drugs.
a. True
b. False
List some endurance training exercises.
Answer:
•Walking briskly
• Running /jogging
•Dancing
•biking
What is the relationship between the mass of the objects and the force exerted?
Answer:
Objects with mass exert forces on each other via the force of gravity. This force is proportional to the mass of the two interacting objects, and is inversely proportional to the square of the distance between them. The factors G, M, and r are the same for all masses at the surface of the Earth.