Answer:
-18 Nm
Explanation:
Impulse = Change of Momentum
I = ∆p
I = mv2 - mv1
I = 3 x 3 - 3 x 9
I = 9 - 27
I = -18 Nm
Practice
1. Nitrogen and oxygen
en and oxygen in their liquid states have densities only 0.8 and 0.9
water. Atmospheric pressure is due primarily to the weight of nitro-
and oxygen gas in the air. If the atmosphere liquefied, would its depth
be greater or less than 10.3 m?
Answer:
In both cases the height is greater than 10.3 m
Explanation:
Pressure is defined by the relationship
P = F / A
in this case the force is the weight of the two gases
F = W = m g
If we use the definition of density
ρ = m / V
V = A h
m = ρ A h
we substitute
P = ρ g h
h = [tex]\frac{P}{\rho g}[/tex]
For this case the density of the gases is
ρ' = 0.9 [tex]\rho_{water}[/tex]
h =[tex]\frac{P}{0.9 \ \rho_{water} g}[/tex]
we calculate
ρ’= 0.9 \rho_{water}
h = 1 105 / (0.9 1000 9.8)
h = 11.3 m
ρ’= 0.8 \rho_{water}
h = 1 105 / (0.8 1000 9.8
h = 12.8 m
In both cases the height is greater than 10.3 m
What kind of waves are present during an earthquake? ...
What kind of energy does an unlit match have? ...
Which of these is another way to write Newton's second law of motion? ...
What is it called when light changes direction after leaving a lens? ...
How do you calculate density?
Answer:
1. The two main types of waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the planet like ripples on water. Earthquakes radiate seismic energy as both body and surface waves.
2. potential energy
3. Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
4. Refraction is the bending of light
5. Density uses the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V). Density is defined as mass per unit volume.
Explanation:
a tennis ball mashine fires aball vertically upward at time t=0 at 19.6 m/s assume the air resistance is negligible and take g=9.8m/s^ calculate the displacement and velocity of the ball at t=1.0s,2.0s,3.0s and 4.0s
Answer:
See the answers below.
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]y=y_{o}+v_{o}*t+0.5*g*t^{2}[/tex]
where:
y = final elevation [m]
yo = initial elevation = 0
vo = initial velocity = 19.6 [m/s]
t = time required [s]
g = gravity acceleration = 9.81 [m/s²]
Now we can replace the different times in the equation above.
For t = 1 [s]
[tex]y=0+(19.6*1)-0.5*9.81*(1^{2} )\\y = 14.7 [m][/tex]
For t = 2 [s]
[tex]y=0+(19.6*2)-0.5*9.81*(2^{2} )\\y = 19.58 [m][/tex]
For t = 3 [s]
[tex]y=0+(19.6*3)-0.5*9.81*(3^{2} )\\y = 14.7 [m][/tex]
For t = 4 [s]
[tex]y=0+(19.6*4)-0.5*9.81*(4^{2} )\\y = -0.08 [m][/tex]
We can see that the sign of gravitational acceleration is negative, since it points in the opposite direction to the motion of the launch.
Note when the time is equal to 4 seconds we see that the distance is 0, ie the tennis ball has reached its maximum height and begins to descend.
Please select the word from the list that best fits the definition
Calculated by angular velocity/time
Answer:
Hi... Your answer is angular acceleration
Every day, we use electric power to run our modern appliances. Electric power transmission lines are visible examples of transportation of electricity. Power is the rate at which energy of any type is transferred. The factors that determine the consumption of electric power are both current as well as voltage. Our society depends on electricity. Using it more efficiently will mean that impact of our natural resources can be reduced.
In a domestic circuit as shown in the figure below, A room has a ceiling fan, a tube light and a filament bulb. The tube light draws 40 W, the fan 120 W and the bulb draws 60 W on an average. The tube light is kept on for 6 hours, the fan for 12 hours and the bulb for 5 hours a day. The rate of electrical energy consumed is 3.5 rupees/ unit.
i) How many units of energy are consumed only by the fan for a day?
a) 144
b) 1.44
c) 14.4
d) 0.144
ii) Identify the correct statement about the combination of the three electrical components:
a) All three are in series and applied potential across each component remains same.
b) All three are in parallel and current through each component remains same.
c) All three are in parallel and applied potential across each component remains same.
d) All three are in series and current through each component remains same.
iii) What should be the characteristics of the material used for making the safety device used to protect these appliances?
a) It should have high melting point and high resistivity.
b) It should have high melting point and low resistivity.
c) It should have low melting point and high resistivity.
d) It should have low melting point and low resistivity
iv) Which among the following equation cannot be used to calculate electric power.
a) P= VI
b) P = V2 / R
c) P = I2 R
d) P= I2 / R
v) If two more bulbs of power 80 W and 100 W are included parallel to the 60 W bulb, which bulb will consume more energy?
a) 80 W
b) 60 W
c) 100 W
d) All the bulbs will consume same energy
Answer:
BN/A (Figure not shown)ADCThe nucleus in an iron atom has a radius of about 4.0 10-15 m and contains 26 protons. (a) What is the magnitude of the repulsive electrostatic force between two of the protons that are separated by 4.0 10-15 m?
Answer:
The repulsive electrostatic force between two of the protons is 14.4 N.
Explanation:
Given;
distance between the two protons, r = 4 x 10⁻¹⁵ m
charge of a proton, q = + 1.6 x 10⁻¹⁹ C
The repulsive electrostatic force between two of the protons is calculated by applying Coulomb's law;
[tex]F = \frac{k q_1 q_2 }{r^2} \\\\where;\\k \ is \ Coulomb's \ constant = 9\times 10^9 \ Nm^2/C^2 \\\\F = \frac{9\times 10^9 \ (1.6\times 10^{-19})^2}{(4 \times 10^{-15})^2} \\\\F = 14.4 \ N[/tex]
Therefore, the repulsive electrostatic force between two of the protons is 14.4 N.
Musical instruments that produce sound by vibration of a stretched string
Answer:
Stringed instruments (chordophones).
Explanation:
Musical instruments that produce sound by vibration of a stretched string are called stringed instruments (chordophones).
Some examples of stringed instruments are guitar, piano, harp, violin, sitar etc.
A guitar can be defined as a musical instrument with six or twelve strings and a long fretted fingerboard that are being played using a plectrum or by strumming (plucking) with the fingers, usually in a downward direction.
Basically, a guitar is a musical instrument that produces sound through regular vibrations and as a result of this, it is used for creating uniform and melodious sounds.
How is an emulsion different from other colloids?
Answer:
The difference between colloid and emulsion is that a colloid can form when any state of matter (solid, liquid or gas) combine with a liquid whereas an emulsion has two liquid components which are immiscible with each other
Explanation:
An Airplane taxis onto the runway going at 10 m/s. If it can accelerate steady at 3
m/s2 and its take-off speed is 90 m/s, what length of runway will it need? *
130 m
1350 m
1333 m
2666.7 m
A race car was is moving at a constant speed of 35 m/s. A security car was
Answer: 1333 m
the length of runway it will need is S = [tex]\frac{90^{2}-10^{2} }{2.3}=1333[/tex] (m)
Explanation:
How can speed and velocity be used to describe motion?
Answer:
speed described how fast the object moves velocity describes how fast and in what direction its moved..
What’s the substance that is formed as the result of a chemical reaction?
A. Chemical reaction
B. Catalyst
C. Activation energy
D. Collision theory
E. Products
F. Reactants
G. Reaction rate
Answer:
d
Explanation:
how can you verify the archimedes principle?
Answer:
It is found that W1 - W2 loss in weight of solid when immersed in water is equal to the weight of the water displaced by the body. This verifies Archimedes' principle.
A 20 cm square frame that can rotate about the 00' axis is placed in a homogeneous magnetic field with 0.5T induction directed vertically downwards.
a) Draw vectors of forces acting on the sides of the frame.
b) calculate the values of these forces and the resultant force acting on the frame.
c) calculate the torque of the frame.
The solution to this task is f00king Dis.
acrostic poem for cell theory. Especially theory
Answer:
In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction.
Explanation:
The three tenets to the cell theory are as described below:
All living organisms are composed of one or more cells.
The cell is the basic unit of structure and organization in organisms.
Cells arise from pre-existing cells.
There is no universally accepted definition of life. Some biologists consider non-cellular entities such as viruses living organisms,[1] and thus reasonably disagree with the first tenet. Throughout this article, it will lead you through the history of cell theory, how the discovery of cells was made possible, what the cell theory has become today and background information and history regarding other opposing concepts of cell theory.
Please help as soon as possible!! Please!
Explain why can an object moves or remain
stationary if it has balanced forces acting on it
Answer:
A balanced force means that equal force is being applied to an object on opposite sides. If equal force is being applied, there will be no change in the motion of the object; it will remain stationary. A greater force needs to be applied to one side for movement to take place.
Explanation:
Hope this helps (づ｡ ◕‿‿◕｡) づ
Love ya
In which of the following sentences is work used in the everyday sense of the word?
a. Lifting a heavy bucket involves doing work on the bucket.
b. The force of friction usually does negative work.
c. Sam and Rachel worked hard pushing the car.
d. Work is a physical quantity:
Answer:
Hi... Your answer is B... a is not work because work is ziro
Help help help plzzz. A 15-kilogram wagon originally at rest on a level road is pulled by a rope that exerts a constant horizontal force of 45 newton's, If the frictional forces on the wagon total 15 newton's, what will be its acceleration ? *
2.0 〖m/s〗^2
4.0 〖m/s〗^2
15 〖m/s〗^2
30 〖m/s〗^2
3.0 〖m/s〗^2
Answer:
A. 2m/(s^2)
I hope it will be useful.
write the Newton's first law of motion any three examples to justify
Answer:
stationary object with no outside force will not move. With no outside forces, a moving object will not stop. An astronaut who has their screwdriver knocked into space will see the screwdriver continue on at the same speed and direction forever. There are no forces acting on the screwdriver from friction.
What is the frequency of this wave?
O1
O2
O3
O4
Answer:
f = 1/t
1/1
=1
Explanation:
The frequency f = 1/T = ω/2π of the motion gives the number of complete oscillations per unit time. It is measured in units of Hertz, (1 Hz = 1/s).
Find the maximum velocity possible for the person on the swing.
if someone could explain with work that would be very much appreciated since I wasn't there when this was discussed in class.
Answer:
The maximum possible speed is 4.85 m/s.
Explanation:
The Principle Of Conservation Of Mechanical Energy
In the absence of friction, the total mechanical energy is conserved. It means that :
[tex]E_m=U+K[/tex] is constant, being U the potential energy and K the kinetic energy
U=mgh
Where m is the mass of the object, g is the gravitational acceleration and h is the height from a fixed reference.
[tex]\displaystyle K=\frac{mv^2}{2}[/tex]
Where v is the speed.
When the person is at a maximum height of 2 meters, the speed is 0. Thus the mechanical energy is made only of potential energy.
Let's fix the reference for the height to the point where the person is at minimum height (1 m from the ground level). The maximum height with respect to this reference is h=2.2 m - 1 m = 1.2 m.
The potential energy is:
U = m*9.8*1.2
U = 11.76m
When the person is at the minimum (zero) height, the mechanical energy is made only of kinetic energy. Since the mechanical energy is conserved, then:
[tex]\displaystyle \frac{mv^2}{2}=11.76m[/tex]
Multiplying by 2 and simplifying by m:
[tex]v^2=2*11.76=23.52[/tex]
Solving for v:
[tex]v=\sqrt{23.52}=4.85[/tex]
[tex]\boxed{v=4.85}[/tex]
The maximum possible speed is 4.85 m/s.
Objects with different masses have the same gravitational force acting
on them.
TRUE
FALSE
The engine that moves the cables for the San Francisco cable cars delivers 390.3 kW of power for each line. How long does it take for 6.5 ×10^6 J of work (about the amount of work needed to raise a partially loaded cable car up Nob Hill) to be done by this engine?
Answer:
It would take 16.7 s for the work to be done by the engine.
Explanation:
From the question, given: Power = 390.3 kW
Work to be done = 6.5 x [tex]10^{6}[/tex] J
But, power and work done with respect to time, has a relationship of:
Power = [tex]\frac{work done}{time}[/tex]
So that,
time = [tex]\frac{work done}{Power}[/tex]
Thus,
time = [tex]\frac{6.5*10^{6} }{390.3*10^{3} }[/tex]
= 16.6539
time = 16.7 s
Time required is 16.7 seconds.
Thus, it would take 16.7 s for the work to be done by the engine.
When all forces act on an object what's it called?
Answer:
Gravity
Explanation:
PLZ HELP!! WILL MARK BRAINLIEST!!
As waves get closer to a beach they:
decrease in energy
increase in energy
decrease in height
increase in length
1. how to find out the elecronic structure of
i. lithium
ii. potassium
iii. sodium
Answer:
See explanation
Explanation:
To find out the electronic structure of each element, you must know the number of electrons it contains.
If you find that out(the number of electrons in the neutral atom of an element is the same as its atomic number). Then you arrange those electrons in such a way that the first shell has only two electrons and subsequent shells have eight electrons.
Look up the groups to which the elements belong in the periodic table All the elements are in group 1 so the last shell must have only one electron.
Which object has a net force of -68 N?
F = 31 N
F = 89 N
F, = 27 N
F=-53N
F = 53 N F-56N
F = 103 N
F = 34 N
F=-102 N
F = -27 N
F = -74 N
F=-89 N
Done
8 of 9
Answer:
5 or 6
Explanation:you
Answer:
The 3rd graph
Explanation:
The graph that says:
Fn = 27 N
Ff= -102 N
Fp= 34 N
Fg= -27 N
what should we do to be a computer engineer ?
Answer:
to be an eginere u would have to go to college and study hard
Explanation:
———PLEASE HELP——— I NEED THE ANSWERS (ILL GIVE BRAINLIST)
Answer:
mountains, earthquakes, tsunamis
Explanation:
The tendency to have more confidence in judgment and decisions than one should, based on probability or past experience is __________.
A.
belief bias
B.
overconfidence
C.
confirmation bias
D.
the availability heuristic
Answer:
Its B- overconfidence
Explanation:
The tendency to have more confidence in judgment and decisions than one should is called Overconfidence
What is overconfidence?
Overconfidence is a bias in which a person's subjective confidence is his or her judgement is reliably greater then the objective accuracy of those judgments when confidence is relatively high
Hence, The tendency to have more confidence in judgment and decisions than one should is called Overconfidence
correct answer : option B)Overconfidence
Learn more about Overconfidence :
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