A 1000 kg mass car moved in a straight, horizontal motion, with a speed of 20m / s, when it was involved in an accident. It was subjected for 0.1s to an intense force, coming to rest after that time interval, any time. is the mean value of the modulus of this resulting force?
Answer:
average value of the resulting force
Explanation:
The average module value of this resulting force is equivalent to 2.0. 10⁵ N.
The impulse of a force can be calculated by the product of the intensity of the force applied by the time interval in which it is applied -
I = F.Δt
Where,
F = Strength in Newtons
Δt = time interval in seconds
I = Impulse in N.s
The impulse of a force is equivalent to the variation of the amount of movement it causes in the body.
I = ΔQ
The amount of movement is a vector quantity that results from the multiplication of the mass of a body by its speed. Its direction and direction are the same as the velocity vector of the body.
Q = m-V
As the car goes to rest after the application of force, the amount of final movement of the car is equivalent to zero.
I = 0 - mV
F. Δt = - mV
F. 0,1 = - 1000. 20
F = - 20000/0,1
F = 200,000 N
F = 2,0. 10⁵ N
Love, which can’t be observed or measured directly, is an example of a psychological construct.
Please select the best answer from the choices provided
T
F
A 5. 3 ft -ft-tall girl stands on level ground. The sun is 30 ∘ above the horizon. How long is her shadow?
The length of the girl's shadow is approximately 9.18 ft. The length of the shadow of a 5.3 ft-tall girl standing on level ground with the sun 30 degrees above the horizon, we can use the shadow length formula:
L = H / tan(a)
where L is the length of the shadow, H is the height of the object (in this case, the girl), and a is the angle to the source of light (in this case, the sun).
we can see that the formula for calculating the length of a shadow is given in. We can also see that the height of the girl is 5.3 ft and the angle to the source of light (the sun) is 30 degrees, as given in.
Plugging these values into the formula, we get:
L = 5.3 / tan(30)
L = 5.3 / 0.5774
L = 9.18 ft (rounded to two decimal places)
Therefore, the length of the girl's shadow is approximately 9.18 ft.
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could any of u help me with these question. Its 8th grade science i need help with it
A yacht sailing to the east at a constant velocity took 0.7hours to sail 70kilometers. What was the yacht's velocity?
Answer:
v = 100 [km/h]
Explanation:
To solve this problem we must identify that the movement is at constant speed, that is, there is no acceleration, therefore we must use the following expression for Speed, which relates is displacement with time.
v = d/t
where:
v = velocity [km/h]
d = displacement = 70 [km]
t = time = 0.7 [h]
v = 70/0.7 = 100 [km/h]
Name the three types of musical instruments. How is sound produced in each type?
Answer:
keyboard , guitar and violin
amplitude of superposition of two waves y1 = 5sinwt and y2 = 5coswt is
(2 Points)
a) 0
b) 5
c) 52
d) 10
along with explanation
Answer:
correct answer is a
Explanation:
For this exercise we must add the two oscillations
y_total = y₁ + y₂
y_total = 5 sin wt + 5 cos wt
y _total = 5 (sin t wt + cos wt)
the sine and cosine functions are related
cos (a +90) = cos a cos 90 - sin 90 sin a = - sin a
let's call
a= wt
let's substitute
y_total = 5 (-cos (wt +90) + cos wt)
the cosine function has the same value for +θ and -θ
cos θ = cos (-θ)
Thus
y_total = 0
correct answer is a
What body systems work together whenever you get a cut on your finger?
A. Reproductive and skeletal system
B. Circulatory system and immune system
C. Circulatory system and digestive system
D. Digestive system and nervous system
Rows on the periodic table are known as
Columns
O Families
O Rows
O Periods
Answer:
periods
Explanation:
The answer is periods i googled it
A toy car of mass 2-kg travels along a horizontal surface with negligible friction at a speed of 1.0 m/s. The car then collides with a vertical wall. The wall applies a force of magnitude 20 N for 0.2 s on the toy car. Which of the following predicts the motion of the toy care immediately after the collision?
A: The speed of the car will increase, and the car will travel in the opposite direction.
B: The speed of the car will decrease, and the car will travel in the opposite direction.
C: The speed of the car will remain the same, and the car will travel in the opposite direction.
D: The car will stop and remain motionless.
Please show your work in finding the direction of motion - ie. please don't use common sense but rather show the applicable physics principles along with formulas to find the direction of motion.
Answer:
An experiment is conducted in which a cart travels across a horizontal surface and collides with a wall. Data collected from the experiment are used to create the graph of the cart's velocity as a function of time. All frictional forces are considered to be negligible. Which data from the graph should the student use to determine the direction of the net force exerted on the cart and the direction of the change in momentum of the cart from the time intervals of A to B?
Explanation:
As we know that
Force=dp/dt(Change in momentum/time)So
20N=dp/2dp=10N/sHence the speed of car will remain the same it won't affect the speedAs momentum from wall is more the ball will travel in opposite directionOption C is correct
A 35.0 - g bullet moving at 475 m/s strikes a 2.5 - kg bag of flour at rest on ice. The bullet passes through the bag and exits it at 275 m/s. How fast is the bag moving when the bullet exits?
please show work.
Answer: 2.8 m/s
Explanation:
Because momentum is conserved, the momentum obtained by the bag matches the momentum lost by the bullet.
The momentum gained by the bag = MV = 2.5V
Loss in momentum of bullet = m(u-v) = 0.035(475 - 275) = 7 kg*m/s
2.5V = 7
V = 7 /2.5 = 2.8 m/s
Therefore, the speed of the bag is 2.8 m/s
What is the strength of the electric field 0.020 m from a 12 µc charge? (use k=) 5.4 × 106 n/c 2.7 × 108 n/c 5.4 × 1012 n/c 2.7 × 1014 n/c
The strength of the electric field will be 2.7 x 108 N/C.
What is the strength of the electric field?The strength of the electric field is the ratio of electric force per unit charge. Its unit is NC⁻¹.
The given data in the problem is;
E is the strength of the electric field =?
d is the distance = 0.020 m
q is the charge= 12 µc =12 ×10⁻⁶C
The electric field strength is given by;
[tex]E = \frac{Kq}{d^2} \\\\E = \frac{9 \times 10^9\times 12 \times 10^{-6}}{(0.020)^2} \\\\E = 2.7 \times 10^8 N/C[/tex]
Hence the strength of the electric field will be 2.7 x 108 N/C.
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Answer B is right or 2.7 × 108 N/C
Explanation:
How many energy levels do elements in Period 6 have?
Answer:
food
Explanation:
How many types of charges are gained by rubbing objects?
(a) 2
(b) 1
(c) 3
(d) 4
Answer:
Explanation:
Rubbing objects together generates static charges. There will be two type of charges: positive and negative. So the answer is (a) 2.
Answer:
2
Explanation:
When you rub two objects one gets positively charged and other gets negatively charged
Then they attracts each other.So
there are two charges
PositiveNegative1. Charges acquired by rubbing is called_____
2.A ______ can save building from lightning stroke.
Answer:
static electricity and then lightning rod
1. friction
2. Lightning rod/conductor
What happens within the motor when an electric current flows through the loop of a wire
Answer: I think its B: The loop becomes electromagnetic, which causes the loop to flip and produce mechanical energy.
Explanation:
what has the ability do when a force is applied to an object over distance
Hello friend! Hope you find this response helpful! :)
If you apply a force over a given distance - you have done work. Work = Change in Energy. If an object's kinetic energy or gravitational potential energy changes, then work is done. The force can act in the same direction of motion. Or, the force can act against the motion.
Conduction is the transfer of
energy from one object to another
Heat flows from one molecule to another because the partic
with one another.
Here is your Answer:-
Conduction is how heat transfers through direct contact with objects that are touching. Any time that two objects or substances touch, the hotter object passes heat to the cooler object. (That hot sand passed the heat energy right into my poor feet)!
Answer:
Conduction is the transfer of thermal energy from one object to another through the movement of molecules. Heat flows from one molecule to another because the particles are in direct contact with one another.
What is the relationship between amplitude and frequency of a wave?.
Answer:
Inversely proportional
Explanation:
The amplitude and frequency of a wave have an inverse connection, with the amplitude being inversely proportional to the frequency. As the frequency rises, the amplitude falls. As the frequency decreases, the amplitude increases.
If two objects are the
different sizes and the
same temperature, which
object will have more
thermal energy?
Answer:
I would say the smaller object.
Explanation:
In any case, thermal energy can be spread throughout the object easier, and quicker, rather than the bigger object.
For example: You are boiling two pots of water, let's suppose Pot A has twice as much as Pot B:
|--------------------- | | |
| | |----------------------- |
|_____________| |______________|
Pot A Pot B
If you boil them at both the same time, temperature, and continue that for sometime, your results will be that Pot B will have risen in temperature alot faster than Pot A
The comparison:
Pot A and Pot B's Amount of water - Supposed to be the different size of the objects
Stove/Boiling: Would be if thermal heat were to enter the objects at the same temperatures.
Which of the following surface offers minimum friction ?
Sand
Water
Ice
Grass
Answer:
it is Ice, of course
Explanation:
some text to answer
Poisoner's Handbook Video
Questions
1. What are some symptoms of cyanide poisoning?
2. Describe the state of death investigation in the New York Medical Examiner's office/police department prior to the
hiring of Dr. Norris?
3. What famous hospital became the home of Norris lab?
Bellevue Hospital
4. In what ways did the local government officials (mayor, etc.) try to discourage Norris?
5. Morris believed that Prohibition had become a plague? Why did he refer to Prohibition as a "national experiment in
extermination'?
6. Why was the Standard Oil manufacturing plant referred to as the looney bin?
7. What is illuminating gas? Why was it responsible for more deaths in New York than measles and tuberculosis?
8. Radium was used in painting clock and watch faces because it glowed and make the numbers and hands illuminate
at night. These were worn by servicemen during the war. Women worked in the factories painting these time
pieces during war time. They were known as the radium girls. What effects did these girls experience as a results of
their exposure to radium?
9. What mineral does radium mimic? What effect does this have on the body?
10. Describe New York when the depression hit?
11. What did Prohibition promise that did not happen?
12. Who is Mike the Durable? How did he get this nickname?
Dizziness, Headache, Nausea, vomiting, rapid breathing, rapid heart rate, Restlessness and Weakness are the symptoms that shows poisoning of cyanide.
What are some symptoms of cyanide poisoning?Dizziness, Headache, Nausea and vomiting, Rapid breathing, Rapid heart rate, Restlessness and Weakness are the some of the symptoms of cyanide poisoning. Cynaide is a very dangerous and fast acting poison that leads to death if not treated on time.
So we can conclude that all above are the symptoms caused by cyanide poisoning.
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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]
-,-
What is the relationship between amplitude and frequency of a wave?.
Answer:
The relationship between the wave's amplitude and frequency is such that it is inversely proportional to the frequency. The amplitude decreases as the frequency increases. The amplitude increases as the frequency decreases. The higher the energy of a wave, the higher the amplitude. The lower the energy, the lower the amplitude. Energy has no effect on wavelength, speed, or frequency, only the amplitude.
Explanation:
An object of mass 4.0kg is situated at a point where there is gravitational field strength of 9.0N/kg. What is the weight of the object
Answer:
Explanation: mASS = 4 KG
G.F = 9 N/KG
SO
W = 9 X 4
W = 36 N
How can an electrical current produce a magnetic field, and how can a magnetic field produce an electrical current?.
Answer:
As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion. The spinning and orbiting of the nucleus of an atom produces a magnetic field as does electrical current flowing through a wire. The direction of the spin and orbit determine the direction of the magnetic field.
Explanation:
hope this helps
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What is the relationship of gas pressure to it temperature?
Explanation:
By Gay-Lussac's law
Pressure is directly proportional to its temperature at given volume.
When the temperature of a system goes up, the pressure also goes up, and vice versa.
Answer:
So, as pressure increases, temperature will increase as well or vice- versa
Explanation:
The Ideal Gas Equation is PV = nRT, where :-
P = Pressure
V = Volume
n = number of moles
R = Molar Gas Constant
T = Temperature
In this, P ∝ T
=> So, as pressure increases, temperature will increase as well or vice- versa
why does heat flows from hot body to cold body?
Answer:
The atoms in the hot bodies have higher kinetic energy than those of the cold bodies. Thus to maintain thermal equilibrium, the atoms of higher kinetic energy tries to move and collide with the atoms of low kinetic energy. Thus heat transfers from a hot body to a cold body.
Explanation:
Explanation:The atoms in the hot bodies have higher kinetic energy than those of the cold bodies. Thus to maintain thermaler kinetic energy tries to move and collide with the atoms of low kinetic energy. Thus heat transfers from a hot body to a cold body.
A car of mass 1700kg moves in a straight line along a slope that is at an angle θ to the
horizontal, as shown in Fig. 3.1.
The car moves at constant velocity for a distance of 25m from point A to point B.
Air resistance and friction provide a total resistive force of 440N that opposes the motion of the car.
For the movement of the car from A to B:
(i) state the change in the kinetic energy.
[How do you find the change in kinetic energy?..]
The change in the kinetic energy is (22000 + 416500sinθ) J
Net force on carThe net force on the car F' = F - f - N where
F = force due to car, f = total resistive force = 440 N and N = horizontal component of weight of car = mgsinФ where m = mass of car = 1700 kg, g = acceleration due to gravity = 9.8 m/s² and θ = angle of slopeSo, F' = F - f - N
F' = F - f - mgsinθ
Since the car moves at constant velocity, the net force F' = 0
So, F' = F - f - mgsinθ
F - f - mgsinθ = 0
F = f + mgsinθ
Work-kinetic energy theorem
From the work-kinetic energy theorem,
The kinetic energy change of the car ΔK equals the work done by force on car, W
ΔK = W = Fd where
F = force on car and d = distance moved by car = 25 mΔK = Fd
= (f + mgsinθ)d
= fd + mgdsinθ
Change in kinetic energy of car
Substituting the values of the variables into the equation, we have
ΔK = fd + mgdsinθ
= 440 N × 25 m + 1700 kg × 9.8 m/s² × 25 m × sinθ
= 22000 Nm + 416500sinθ Nm
= (22000 + 416500sinθ) J
So, the change in the kinetic energy is (22000 + 416500sinθ) J
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What goes up but never ever comes down?
Answer:
Your age
Explanation:
Which question investigates a characteristic shared by electromagnetic and mechanical waves?
A
How much energy can the waves carry?
B
What are the speeds of the waves in different media?
С
Which medium do both kinds of waves utilize to travel?
D
In what direction do the particles in the medium vibrate when the waves travel?
Sound waves and other mechanical waves can move energy through solid objects. Energy can be transferred through matter and space via electromagnetic waves, such as light waves. Thus, option A is correct.
What is electromagnetic and mechanical waves?The shifting magnetic and electric fields are what produce electromagnetic waves. They are created by the charged particles' oscillation.
Each type of wave has a drastically different speed as a result of these variations. Mechanical waves move much more slowly than electromagnetic waves, which move at the speed of light.
Mechanical waves are referred to as a periodic disturbance, whereas electromagnetic waves are referred to as a disturbance.
Therefore, electromagnetic and mechanical waves share energy as common characteristics.
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