Answer:
inertia
Explanation:
law of inertia describe it
It is the inertia of the body which describes the existing state of rest or uniform motion in a straight line.
What is inertia?The inertia of the body is defined as If the body is at rest then it will be at the same state until an external force is not applied to it.
Similarly, If the body is in motion then it will remain in motion until and unless an external effort is not applied to stop it.
For example, if the football is placed at the rest on the ground it will never move from the same position until an external force is not applied.
Similarly, if the car is moving at a certain speed then it will only stop if the brakes are applied and if there is not any friction it will never stop.
Thus the inertia of the body describes the existing state of rest or uniform motion in a straight line.
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A 4.0×1010kg asteroid is heading directly toward the center of the earth at a steady 32 km/s. To save the planet, astronauts strap a giant rocket to the asteroid perpendicular to its direction of travel. The rocket generates 5.0×109N of thrust. The rocket is fired when the asteroid is 4.0×106km away from earth. You can ignore the earth’s gravitational force on the asteroid and their rotation about the sun.
a
17. When a 50 cm long wooden log has a radius of 7 cm and a mass of 770g, what is
the density of the wood?
Answer:
The density is 1.1gcm3
an airplane maintains a heading (W20N)at an airspeed of 900 km/h. It is flying through a hurricane with winds of 300 km/h, from the northeast.
a) In which direction is the plane moving relative to the ground?
(B) -what is the ground speed
(C)how long would it take the plane to fly from one city to another 500 km away along the path in (b)
Show working!!
Answer:
tan x = 60/700
x = 4.9 degree east north
v = √(60^2 + 700^2)
v = 702.6 kph
hope this helps
The distance of Saturn from the Sun is 1.43 x 1012 m, while the distance of Mars from the Sun is 2.28 x 1011 m. The period of revolution of Mars is 684 days. What is Saturn's period of revolution?
1. 10744 days
2. 904 days
3. 5000 days
4. 3346 days
You push horizontally on a 120-N box that is initially resting on a horizontal table. The coefficient of static friction between the box and the table is 0.75, and the coefficient of kinetic friction is 0.40. Find the friction force on the box if the push is equal to(a) 84 N; (b) 94 N.
(a) When the applied force is 84 N, the friction force on the box is 36.02 N.
(b) When the applied force is 94 N, the friction force on the box is 46.02 N.
Frictional force on the boxThe frictional force on the box when it is pushed with a certain force is calculated as follows;
Ff = μFₙ
F - Ff = ma
Mass of the box is calculated as follows;
W = mg
m = W/g
m = 120/9.8
m = 12.24 kg
Acceleration of the box is calculated as follows;
a = μg
a = 0.4(9.8)
a = 3.92 m/s²
When the applied force is 84 N,
F - Ff = ma
F - ma = Ff
84 - 12.24(3.92) = Ff
36.02 N = Ff
When the applied force is 94 N,
F - Ff = ma
F - ma = Ff
94 - 12.24(3.92) = Ff
46.02 N = Ff
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why do elements in a group have similar chemical properies?
Answer:
Elements in the group have similar chemical properties. This is because their atoms have the same number of electron in the highest occupied energy level.
Explanation:
Two balls at the ends of two strings are moving at the same
speed in horizontal circular paths. One string is three times
as long as the other. Compare the magnitudes of the two
centripetal accelerations.
Answer:
Fc = M v^2 / R centripetal acceleration
Fc2 / Fc1 = R1 / R2 since M and v are the same for both
If R2 = 3 R1 then the centripetal acceleration for particle 2 will be 1/3 of that of innermost (R1) particle
9. Why does water behave in this unusual fashion?
Answer:
Why does water behave in this unusual fashion? The atmospheric pressure decreases as the elevation increases. This affects the boiling point because at a higher elevation, when there is less atmospheric pressure, there is less energy holding the water particles in place.
Explanation:
The amplitude of the electric field component of an electromagnetic wave is increased from e to 3e. What is the corresponding change in the intensity of the wave?.
When the amplitude electric field increase from e to 3e, the intensity of the wave will increase by a factor of 9.
Intensity and amplitude electric field
The relationship between intensity and amplitude of an electric field given as;
I ∝ E₀²
[tex]\frac{I_1}{E_1_0^2} = \frac{I_2}{E_2_0^2}\\\\I_2 = \frac{I_1E_2_0^2}{E_1_0^2}[/tex]
where;
I is the intensity of the waveE is the amplitude electric fieldWhen the amplitude electric field increase from e to 3e[tex]I_2 = \frac{I_1 \times (3e)^2}{(e)^2} \\\\I_2 = 9I_1[/tex]
Thus, when the amplitude electric field increase from e to 3e, the intensity of the wave will increase by a factor of 9.
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A 200 kg man is stuck, motionless, in the middle of a frictionless ice pond. Because it's cold, he's wearing a coat. He wants to get off the pond. Since he has studied physics and knows about conservation of momentum, he decides to throw his 4 kg coat. If he throws the coat at 50 m/s, what will his speed be
The speed of the man when he throws the coat is 1 m/s.
Conversion of linear momentumThe speed of the man can be determined by applying the principle of conservation of linear momentum as follows;
m₁v₁ = m₂v₂
v₁ = (m₂v₂)/m₁
v₁ = (50 x 4)/200
v₁ = 1 m/s
Thus, the speed of the man when he throws the coat is 1 m/s.
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In some years there are more hurricanes than usual. This is probably because In some years there are more hurricanes than usual. This is probably because there are more windy days than usual. the ocean is warmer than usual. the gravitational pull of the Moon is stronger. the ozone layer is very thin.
Answer:
the ocean is warmer than usual
Explanation:
When the ocean is warmer than usual, more water precipitates upwards into the formation of rain-heavy clouds. When these clouds cross over land and release this large amount of water, hurricanes can be caused.
hope this helps!
Of the physical features listed, which is associated with the greatest earthquake hazard?.
A 750 kg roller coaster car drops from rest at a height of 90 m along a frictionless track. What is velocity of the roller coaster at the top of a second hill that is 60 m high? Show work
The velocity of the roller coaster at the top of the second hill is 24.25 m/s.
What is velocity?
Velocity is the rate of change of displacement. The s.i unit is m/s
To calculate the velocity of the coaster car, we use the formula below.
Formula:
mg(H-h) = mv²/2............... Equation 1Where:
m = mass of the coaster carH = Height of droph = Height of the second hillv = velocity of the roller coaster.From the question,
Given:
m = 750 kgH = 90 mh = 60 mg = constant = 9.8 m/s²Substitute these values into equation 1
750(9.8)(90-60) = 750(v²)/2Solve for v
375v² = 220500v² = 220500/375v² = 588v = √588v = 24.25 m/sHence, The velocity of the roller coaster at the top of the second hill is 24.25 m/s.
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Electrical energy is supplied to a string of lights. What forms of energy are lost?
Answer:
In what forms is the electrical energy that is supplied to a string of decorative lights dissipated? It is converted to thermal energy and light energy.
Answer:
Energy loss. When energy is transformed from one form to another, or moved from one place to another, or from one system to another there is some energy loss. This means that when energy is converted to a different form, some of the input energy is turned into a highly disordered form of energy, like heat.
Energy losses in lights are very large; most of the input energy is lost in the form of heat energy.
Explanation:
What is the wavelength of this wave?
Frequency: 2 Hz
Speed: 5 cm/s
2.5 Hz
2.5 cm
Answer:
2.5 cm
Explanation:
velocity = frequency × wave length
5 = 2 × wave length
wave length = 5÷2 = 2.5 cm not Hz because wave length is distance and measured by cm or m
Help me please!!!!!!!
Answer:
A) Plasticine
Explanation:
Palestine doesn't take much strain to harden and its strain rate isn't sensitive, therefore making it perfectly plastic.
1. In a certain wire, 10 C of charge passes through it in 100 seconds. What is
the current in the wire?
Answer:
the correct answer is 10 wires
Explanation:
So you divide 10x the seconds then you know that 10x10 is 100 and then the answer becomes 10.
please help
Newton second law of motion is F =ma
Answer: ma is the formula of Newton's Second Law of Motion. Newton's Second Law of Motion is defined as Force is equal to the rate of change of momentum. For a constant mass, force equals mass times acceleration.
Explanation: Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
Hi there!
Using Newton's Second Law:
[tex]F = ma[/tex]
F = Net Force (60 N)
m = mass (30 kg)
a = acceleration (m/s²)
Solve for acceleration given the other values.
[tex]60 = 30a\\\\a = \frac{60}{30} = \boxed{2 \frac{m}{s^2}}[/tex]
If the net force increases (while the mass is held constant), the acceleration will INCREASE.
If the mass of the object increases (while the net force is held constant), then the acceleration will DECREASE.
1. How fast is each cyclist going in units of meters per second*?
2. Which cyclist is going faster? How much faster is this cyclist going compared to the other one?
Answer:
1. a = 1m/s
b = 3m/s
2. b is faster by 2m/s
Explanation:
v (speed) = d/t
va (speed for cyclist a) = 5/5
1m/s
vb = 9/3
3m/s
comparison = 3 - 1 = 2
difference = 2m/s
cyclist b is going faster because they cover more distance in a second
A force of 15 newtons is used to push a box along the floor a distance of 3 meters. How much was done?
Answer:
[tex]45 J[/tex]
Explanation:
The equation for work is:
[tex]Work=Force*Distance[/tex]
We can substitute the given values into the equation:
[tex]Work=15N*3m\\Work=45Nm\\Work=45J[/tex]
Answer:
45 J
Explanation:
w =fd
w = 15(3)
You get an email from Amazon that does not use your name, has some misspelled words in it, and
has an attachment. Be careful! This might be an example of:
O plagiarism.
O piracy.
O cyber bullying.
O phishing.
Answer:
plagiarism
Explanation:
thats the answer because plagiarism means: the practice of taking someone else's work or ideas and passing them off as one's own.
Thats the definition!!!
lmk if this helped
Answer:phishing
Explanation:the definition of phishing is: the fraudulent practice of sending emails purporting to be from reputable companies in order to induce individuals to reveal personal information, such as passwords and credit card numbers.
9N 8N
forces: balanced or unbalanced
motion: yes or no
Answer:
Forces: unbalanced
Motion: yes
Explanation:
If one force is bigger than that means the forces are unbalanced.
if the forces acting on an object are greater than or equal to one, there will be motion.
Urgent!!
Hans lifts up a 185.1 kg barbell 1.42 m vertically from the ground.
He then puts it down. What work does Hans do to lift the barbell up to its highest point?
Answer:
he has to be strong enough to lift the barbel so maybe a bit of exercise each day.
Explanation:
Consider a system to be one train car moving toward another train car at rest. When the train cars collide, the two cars stick together. What is the total momentum of the system after the collision? 800 kg • m/s 1,600 kg • m/s 2,400 kg • m/s 4,000 kg • m/s.
The momentum of the body is given by the product of the mass and velocity of the body. The total momentum of the system after the collision is 2400 kgm/sec.
What is the law of conservation of momentum?According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
The momentum of the body is given by the product of the mass and velocity of the body.
According to the law of conservation of momentum
Momentum before collision =Momentum after collision
The given data in the problem is;
mass of train m₁ = 600
mass of car m₂= 400
the velocity of train = 4 m/sec
velocity of car =0 m/sec (rest)
Momentum after collision;
[tex]\rm M_f=m_1v_1+m_2v_2 \\\\\ \rm M_f=600 \times 4 +400 \times 0 \\\\ \rm M_f=2400\;kgm/sec[/tex]
Hence the total momentum of the system after the collision is 2400 kgm/sec.
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Answer:
2,400 kg • m/s
Explanation:
how can the change that the molecular scale affect the Lakes Macro scale appearance
The molecules of water determines the macro scale appearance of the lake .
What is a lake?The term lake is used to describe any large body of water that is surrounded by land. We know that water is composed of molecules and the orientation of molecules affect the macro scale appearance of the water.
Hence, as the molecules of water change their orientation, the macro scale appearance of the lake changes likewise.
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How many tons of eagles are supported by the rabbit population?
In the predator-prey relationship between eagles and rabbits, the larger the population of rabbits, the more the number of eagles the rabbit population can support.
What is a predator-prey relationship?A predator-prey relationship is a relationship between two organisms in which one organism kills the other for food.
The organism that kills the other for food is the predator.
The organism that is killed for food is the prey.
In the relationship between eagles and rabbits, the eagles are the predators while the rabbits are the prey.
The larger the population of rabbits, the more the number of eagles the rabbit population can support.
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A record spins at 33 rpm (revolutions per minute), which is an angular velocity of about 3.46 radians per second. What is the approximate linear velocity of a fly that sits on the record, 12 cm from the center
Hi there!
We can use the following equation to relate angular velocity to linear velocity.
[tex]v = \omega r[/tex]
v = linear velocity (m/s)
ω = angular velocity (3.46 rad/sec)
r = distance from axis of rotation (.12 m)
Plug in the given values.
[tex]v = (3.46)(.12) = \boxed{.415 \frac{m}{s}}[/tex]
If a person does 20 J of work on a book in 10 seconds, how powerful was the person while doing the work?
Answer:
2 W
Explanation:
P = W/t
= 20 J / 10 s
= 2 W
koppen's climate classification system is based mainly on which two factors
A system in which only one particle can move has the potential energy shown in (figure 1). Suppose u1 = 60 j. What is the y-component of the force on the particle at y = 0. 5 m ?.
The y-component of the force on the particle at the given position is 120 N.
Electric force on the particle
The electric force on the particle is determined by applying Coulomb's law and work-energy theorem as shown below;
Fd = W
Where;
F is the applied forced is the distanceW is potentialF = W/d
F = 60/0.5
F = 120 N
Thus, the y-component of the force on the particle at the given position is 120 N.
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