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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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:
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.
In the electric circuit below, light bulbs are placed at A, B, and C. When the switch is closed, all three light bulbs are lit.
What happens to Bulbs A and C if Bulb B burns out?
Both Bulbs A and C will go out.
Bulb A will go out, but Bulb C will stay lit.
Bulb C will go out, but Bulb A will stay lit.
Both Bulbs A and C will stay lit
Answer:
d)Both Bulbs A and C will stay lit
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
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.
Of the physical features listed, which is associated with the greatest earthquake hazard?.
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:
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 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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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.
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
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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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
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:
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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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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Which term best describes how the solar system formed?.
Answer:
Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula.
Explanation:
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.
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 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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True or False: GPS satellites broadcast signals down to Earth, which contain information about the position of the satellite, and the precise time of the signal transmitted from the satellite.
Answer:
true
Explanation:
based on a scientist's research it is proven true because they travel the exosphere and they give information to the weather people and is used for the latest technology. :>
Class 11th physics the charge of positive 7 microcoulomb is placed at the centre of two concentric sphere with radius 2cm and 4cm respectively what will be the ratio of flux through them
Given:
If the charge of +7 mC is placed at the centre of two concentric spheres with the radius 2.0cm and 4.0cm respectivelyNeed to find :
Ratio of the flux through them will be ?
Calculation:
Gauss law :- ø = q/Eₒ
1. For small sphere:- ø1 = q/Eₒ
2. For large sphere :- ø2 = q/Eₒ
=> ø1/ø2 = (q/Eₒ)/(q/Eₒ)
=> ø1/ø2 = 1/1
Ratio of flux is 1:1
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:
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!
koppen's climate classification system is based mainly on which two factors
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
In re imes 2015 What constitutes a wireless transfer of data from a digital camera over a network.
Any person can access the wireless network from any location Within the wireless broadcast and use the digital camera for data transfer.
What is wireless data transfer?The "Wireless network" is a network that is used to communicate with the help of communication signals which are connected to one another.
Likewise, the digital camera is also used to transfer the data images or videos on the network.
This connection is easy to use and its costs are also less in use and maintenance.
The advantage of a wireless network is that anyone can access the internet with the help of cellphones, mobile phones, and laptops without being connected by any wire.
Thus any person can access the wireless network from any location Within the wireless broadcast and use the digital camera for data transfer.
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