Answer:
50N
The table is managing to keep the dog up, the dog is not moving up or down so the force that the table applies to the dog must be equal to the dogs weight - I draw this conclusion from Newton's 3rd law.
W= mg
W = 5 × 9.8
W = 49N
round to.one significant figure = 50N
The force that the table applies on the dog is required.
The force that the table applies to the dog is [tex]10\ \text{N}[/tex]
m = Mass of dog = 5 kg
g = Acceleration due to gravity is assumed to be [tex]10\ \text{m/s}^2[/tex]
Force is given by
[tex]F=mg[/tex]
[tex]\Rightarrow F=5\times 10[/tex]
[tex]\Rightarrow F=10\ \text{N}[/tex]
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A motorcycle rider travelling at 30m/s sees a child run into the streets 190m ahead. If the rider takes 1 second to react before beginning to decelerate at a rate of 3m/s^2, does he stop in time, and if so by what distance is the child safe? (Hint: there a 2 stages of motion)
Answer:
The distance by which the child is safe is [tex]k = 10 \ m[/tex]
Explanation:
From the question we are told that
The speed of the motorcycle is [tex]v_n = 30 m/s[/tex]
The distance of the child from the motorcycle is L = 190 m
The reaction time is [tex]t_r = 1 \ s[/tex]
deceleration is [tex]a = -3m/s^2[/tex]
Generally the distance covered during the reaction time is
[tex]D = v_n * t_r[/tex]
=>[tex]D = 30 * 1[/tex]
=> [tex]D = 30 \ m[/tex]
Generally the distance covered during the deceleration
[tex]v^2 = u^2 + 2as[/tex]
Here v is the final velocity which is zero
So
[tex]0 = 30 ^2 + 2 * (-3)s[/tex]
=> [tex]s = 150 \ m[/tex]
So the total distance the motorcycle rider will cover before coming to rest is
[tex]d = D + s[/tex]
=> [tex]d = 30 + 150[/tex]
=> [tex]d = 180 \ m[/tex]
Therefore the amount of distance by which the child id safe is
[tex]k = L -d[/tex]
=> [tex]k = 190 -180[/tex]
=> [tex]k = 10 \ m[/tex]
what is the relationship between applied force and displacement
Answer:
Force in the Direction of Displacement. The work done by a constant force is proportional to the force applied times the displacement of the object
Acceleration is the change in the speed or direction of an object over time—in other words,acceleration is a change in an object's velocity over time. To determine the rate of acceleration, you usethe formula below. The unit for acceleration is meters per second per second ( m/s2). A positive value oracceleration shows speeding up, and negative value for acceleration shows slowing down. Slowingdown is also called deceleration
Explanation:
The acceleration of an object is equal to the rate of change of velocity. Its mathematical form is given by :
[tex]a=\dfrac{v-u}{t}[/tex]
Where
v is final velocity, u is initial velocity and t is time taken
The SI unit of velocity is m/s and that of time is s. The SI unit of acceleration is [tex]\dfrac{m/s}{s}=m/s^2[/tex]
If final velocity is more than the initial velocity, acceleration is positive.
If the final velocity is less than the initial velocity, the acceleration is negative. It is also known as deceleration.
Hence, all the statement is true.
A system consists of a disk rotating on a frictionless axle and a piece of clay moving toward it, as shown in the figure above. The outside edge of the disk is moving at a linear speed v, and the clay is moving at speed v/2. The clay sticks to the outside edge of the disk. How does the angular momentum of the system after the clay sticks compare to the angular momentum of the system before the clay sticks, and what is an explanation for the comparison?.
Explanation:
Forgive me If I am wrong, it's been a while since I've studied Torque.
The formula for the angular momentum is
momentum= I*w.
We can also write I*W as 1/2MR^2 * W so the extra mass coming from the block of clay would most likely cause the angular momentum to increase from the amount it was before.
The angular momentum of the system before and after the clay sticks will be the same.
Conservation of angular momentumThe principle of conservation of angular momentum states that the total angular momentum is always conserved.
Li = Lf
Iiωi = Ifωf
where;
Ii is the initial moment of inertiaIf is the final moment of inertiaωi is the initial angular velocityωf is the final angular velocityLi is the initial angular momentumLf is the final angular momentumThus, the angular momentum of the system before and after the clay sticks will be the same.
Learn more about angular momentum here: https://brainly.com/question/7538238
PLEASE HELP ASAP !! I WILL MARK YOU BRAINLIEST!!
original question for context:
“Three identical metal spheres are used for an experiment.
Before the experiment begins the charges on the spheres
are as follows”
Sphere: A Charge: -4.0C
Sphere: B Charge: -8.0C
Sphere: C Charge: +9.0C
Total: -3C
By knowing that the total charge must remain constant, we will see that:
c)
Sphere A will have: -4.0 CSphere B will have: 0.5 CSphere C will have: 0.5 CTotal = -3.0 Cd)
Sphere A will have: -1.0 CSphere B will have: -1.0 CSphere C will have: -1.0 CTotal = -3.0 CWhat happens when we touch the charged spheres?
If these are conductor spheres, we can assume that the charge flows through the spheres.
So, when two touches, the charge tries to equilibrate.
When sphere B and sphere C touch, the total charge between them would be equally distributed between the two spheres.
Charge B = -8.0 C
Charge C = +9.0 C
Total = -8.0 C + 9.0 C = 1.0 C
half of that is 0.5 C
Then now both sphere B and sphere C will have 2.5C each.
And sphere A still has the -4.0 C
Then the total of the 3 spheres is:
0.5C + 0.5C - 4.0C = -3.0C
The total charge never changes in a closed system, remember that.
D) Similar to before, this time the total charge will be equally distributed among the 3 spheres.
The total charge is -3.0C
So:
Sphere A will have: -1.0 CSphere B will have: -1.0 CSphere C will have: -1.0 CAnd the total charge will be:
-1.0 C + -1.0 C + -1.0 C = -3.0C
If you want to learn more about charge conservation, you can read:
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1. Use the periodic table to determine which of the following groups of elements would have properties most similar to arsenic (As)
A . Boron (B) , silicon (Si) , and germanium (Ge)
B. Nitrogen (N), Phosphorous (P) , and antimony (Sb)
C. Germanium (Ge) , selenium (Se) , and bromide (Br)
D. Gallium (Ga) , germanium (Ge) , and selenium (Se)
Answer:
D
Explanation:
The correct answer would be option D.
Gallium (Ga) , germanium (Ge) , selenium (Se) , and arsenic (AS) all belong to the same group of elements referred to as the transition elements. The transition elements have partially-filled d orbital, a feature that confers some characteristic properties on the elements or their ions. These properties include:
variable oxidation state of formation of colored ions and compoundscatalytic propertyparamagnetic compoundsetc.blank is the of matter in an object.
Answer:
mass
Explanation:
Explanation:
mass is the answer.......
What is the acceleration of a 20N wooden box moving to the right with a force of 8N? It’s on a flat surface (wood)
Explanation:
if question specifies g=10ms^-2 then use that or else use g =9.81
Mass of wooden box= 20/9.81 = 2.0387359.... kg
F=ma
a=F/m
a=8/2.0387
a=3.92 ms^-2 (3 s f)
ES 1. How fast must a truck travel to stay beneath an airplane that is moving 105 km/hr at an angle of 25 degrees to the ground?
Answer:
The truck must travel at a speed of 98.6677 km/hr to stay beneath the airplane
Explanation:
The given parameters are;
The velocity of the airplane, v = 105 km/hr
The direction of the airplane, θ = 25 degrees to the ground = 25°
Therefore, we have that the horizontal component of the velocity of the plane, vₓ is given as follows;
vₓ = v × cos(θ) = 105 km/hr × cos(25) ≈ 98.6677 km/hr
The vertical component of the velocity of the plane, [tex]v_y[/tex], is given as follows;
[tex]v_y[/tex] = v × sin(θ) = 105 km/hr × sin(25) ≈ 44.37 km/hr
The truck only has to travel at a speed equal to the horizontal velocity of the airplane to stay beneath the airplane
Therefore, the travelling speed the truck must be vₓ which is 98.6677 km/hr to stay beneath the airplane.
C
The unit of force, newton is a derived unit.
derived unit
Answer:
Because
Explanation:
5he force is not fundamental physical unit
A bird flies north 3 kilometers and then south 4 kilometers, what is the resultant displacement of the bird? Do not forget to include the direction
Answer: let north be+ and south be-
therefore, -1 km is the resultant displacement of the bird
hope it helped u,
pls put thanks and pls mark as the brainliest
^_^
Answer:5 meters northeast
Explanation:
I just took the test.
A child tugs on a rope attached to a 0.62-kg toy with a horizontal force
of 16.3 N. A puppy pulls the toy in the opposite direction with a force 15.8 N.What is the acceleration of the toy? (Hint: Remember direction: towards child or puppy?)
Answer:
[tex]a=0.8\ m/s^2[/tex]
Explanation:
Given that,
Mass of a toy, m = 0.62 kg
Horizontal force, F = 16.3 N
Force on the opposite direction, F' = 15.8 N
We need to find the acceleration of the toy.
Here, two forces are acting in opposite direction, the net force will be the difference of forces.
Net force = 16.3 N-15.8 N
=0.5 N
The formula for net force is given by :
F = ma
a is the acceleration of the toy
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{0.5\ N}{0.62\ kg}\\\\a=0.8\ m/s^2[/tex]
So, the acceleration of the toy is [tex]0.8\ m/s^2[/tex].
In physics, tension is described as the pulling force transmitted axially by the means of a string, a cable, chain, or similar object, or by each end of a rod, truss member, or similar three-dimensional object.
According to the question, the formula we use in this method is F = ma as we have to find the acceleration.
Therefore, the formula for the acceleration is
[tex]a= \frac{F}{m}[/tex]
[tex]a= \frac{0.5}{0.62}[/tex]
Hence, after the calculation, the acceleration is 0.8m/s.
For more information, refer to the link:-
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Which factor will not affect the speed of sound?
(size of the medium) or (elasticity of the medium)
Answer:
size of the medium
Explanation:
Which change to an object would reduce its potential energy by half?
A. Reducing its height to one half of its original value
B. Increasing its mass to twice its original value
оооо
O C. Increasing its height to twice its original value
O D. Reducing its mass to one-quarter of its original value
SUBMIT
Answer:
D
Explanation:
2. The speed of truck is 39 m/s. How long does it take for the truck to travel 9,000 m?
Answer:
[tex]\boxed {\tt 230.769231 \ seconds}[/tex]
Explanation:
Time can be found by dividing the distance by the speed.
[tex]t=\frac{d}{s}[/tex]
The distance is 9,000 meters and the speed is 39 meters per second.
[tex]d= 9,000 \ s\\s=39 \ m/s[/tex]
Substitute the values into the formula.
[tex]t=\frac{9,000 \ m}{39 \ m/s}[/tex]
Divide. Note that the meters, or "m" will cancel out.
[tex]t=\frac{9,000}{39 \ s}[/tex]
[tex]t=230.769231 \ s[/tex]
It takes 230.769231 seconds for the truck to travel 9,000 meters at 39 meters per second.
Help!!!!!!! Plsss!! Plsss!
Answer:
A
Explanation:
D is non-metal, gas, insulator
C is also non-metal, insulator
B is a metalloid, semiconductor, still have low melting point
A is a metal, solid, good conductor, have high melting point.
Answer:
This is Hard
Explanation:
I recommend asking a teacher for help
The Empire's space station is a long way from any star. It is circular and has a radius of 5. 10 km. The angular velocity that is needed to give the station an artificial gravity of 9. 80 ms2/ at its circumference is:___.
A) 4. 4 times 10^-2 rad/s.
B) 7. 0 times 10^-3 rad/s.
C) 0. 28 rad/s.
D) -0. 22 rad/s.
E) 1. 3 times 10^3 rad/s
Answer:
A
Explanation:
r= 5100m
acceleration of center=g= [tex]\frac{v^{2} }{r}[/tex]
v= rw, Which is angular velocity X radius
put this in acceleration of center equation
= [tex]\frac{(rw)^{2} }{r} =g[/tex]
= [tex]rw^{2} =g[/tex]
= [tex]5100 . w^{2} = 9.8[/tex]
[tex]w^{2} = 0.0019[/tex]
=[tex]\sqrt{0.0019} = 0.0438[/tex]
which is approximately A.
If a wooden ball has a mass of 2.4g and a volume of 6cm3. What is it’s density?
Answer:
The answer is 0.4 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 2.4 g
volume = 6 cm³
We have
[tex]density = \frac{2.4}{6} \\ [/tex]
We have the final answer as
0.4 g/cm³Hope this helps you
a force of 4.40 N is applied to a dart over a distance of 0.54 m. The dart has a mass in of 0.028 kg. Assuming no energy is lost due to friction. what will be the speed of the dart after it’s thrown.
The kinetic energy refers to energy in motion. The moving dart possesses kinetic energy. From the calculations, the speed of the dart after it is thrown is 13 m/s.
What is energy?The term energy refers to the ability to do work. We must note that work done is throwing the dart is equal to the kinetic energy of the moving dart once it is thrown.
If work done = kinetic energy = Fx
Where;
F = force
x = distance
W = 4.40 N * 0.54 m = 2.376 J
Now;
KE = 1/2 mv^2
m = mass of the dart
v = velocity of the dart
v = √2KE/m
v = √2 * 2.376/ 0.028
v =13 m/s
Learn more about kinetic energy: https://brainly.com/question/999862
Good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
CAN SOMEONE ACTUALLY PLEASE ANSWER THIS AND NOT GIVE A RANDOM ANSWER, IT RUINS PEOPLE'S DAY SERIOUSLY.
Answer:
Option B
Explanation:
Green house gases are Carbon dioxide, sulphur dioxide etc.These gases absorb long wave photons of infrared light .They are the main reasons behind global warmingCalculate the weight of your 2kg physics book on earth
A.15 N
B.19.6 N
C.9.8 N
D.4.9 N
How many minutes are in 2 1
4 hours?
Answer:
If you are meaning to say 214 the answer is 12840 minutes
Explanation:
Select the correct answer.
In which of these examples does chemical energy change to electrical energy
A. digesting food
B. photosynthesis
C. respiration
D. using a battery
Recet
Answer:
I think it would be using a battery recet
Explanation:
Answer: Using a battery
Explanation:
Directions: Determine the absolute location of the following places.
1. Spain - _______
2. Japan- _______
3. England - _______
4. China - _______
5. Philippines - _______
Answers:
Spain = 42° N, 8° WJapan = 38° N, 138° EEngland = 55° N, 10° WChina = 35° N, 105° EPhilippines = 10° N, 122° ENote: The map doesn't mention "England", but instead it shows "United Kingdom". They are different but related concepts. I'll treat them as the same for the sake of simplicity.
====================================================
Explanation:
Since we're not talking about points, but rather large areas/countries, this means that an absolute single location doesn't make much sense.
However, we can try to go for the middle-most part of the country if possible.
Spain's northernmost and southernmost boundaries are between the 30° and 45° latitude lines in the northern hemisphere. The country appears to be closer to 45° N rather than 30° N. A good estimate is maybe something like 42° N. Though like I said, there's going to be wiggle room here depending which point you use as the representative point of Spain. The larger the country, the more variation in possible answers.
At the same time, much of Spain appears to be between the Prime Meridian and the longitude line 15° W. I'll split the difference and get (0+15)/2 = 15/2 = 7.5 = 8.
Therefore, one estimate of Spain's absolute GPS location is 42° N and 8° W
The other countries are handled in a similar fashion.
Once the ball reaches the very top it's velocity is ?
A) zero
B) negative
C) accelerating
D) positive
Which statement explains why a strip of sulfur is a better electrical insulator
than a strip of silicon?
A. Sulfur atoms have fewer protons than silicon atoms.
B. Sulfur atoms have more protons than silicon atoms.
C. Sulfur atoms allow more electrons to move between atoms than
silicon atoms do.
D. Sulfur atoms allow fewer electrons to move between atoms than
silicon atoms do.
Answer:
I think.d
(•‿•) bakalang tama
Answer:
d
Explanation:
because atoms fewer electrons to move between atoms than silicon atoms do
PLEASE HELP FAST
A 70kg physics student is pushed with the force of 140 N , what will be the students acceleration ?
Answer:
The answer is 2 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
f = 140 N
m = 70 kg
We have
[tex]a = \frac{140}{70} = \frac{14}{7} \\ [/tex]
We have the final answer as
2 m/s²Hope this helps you
How can people in australia be held on earth when they are ""upside down""?.
Answer:
Gravity
Explanation:
Because gravity is pulling you toward the center of the Earth.
The coefficient of friction between a car and dry pavement is approximately 0.7, but the coefficient on wet pavement is 0.4 or less. What does this indicate about driving on wet pavement? A) A car's normal force is less on wet pavement. B) A car's normal force is greater on wet pavement. C) A car requires less applied force to move on wet pavement. D) A car requires more applied force to move on wet pavement.
Answer:
D) A car requires more applied force to move on wet pavement
Explanation:
The coefficient of friction determines the frictional force that the ground applies on the car .
Maximum force of friction generated = μ R where μ is coefficient of friction and R is reaction force of the ground
Reaction force of the ground = mg or weight of the car . Since weight is same on dry and wet ground so normal force will be same is both the case .
Force of friction generated in respect of dry pavement will be more because of greater coefficient of friction .
Friction force helps in driving a car in forward direction hence it is easy to drive car on dry pavement . On wet pavement , it will slip off at the same place rather than move forward .
ASAP
An object was placed in 75 ml of water. When the object was then measured in the water, the new volume of the water with the object was 86 ml. What is the volume of the object?
Note: You only have to fill in the numerical answer.(no units)
Answer:
The answer is 11 mLExplanation:
To find the volume of the object we use the formula
volume of object = final volume of water - initial volume of water
From the question
final volume of water = 86 mL
initial volume of water = 75 mL
So we have
volume of object = 86 - 75
We have the final answer as
11 mLHope this helps you