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
PositiveNegativewhat would have the greatest gravitational pull on each other?
A. Two small objects
B. A large and small object
C. Two large objects close tk each other
Answer:
A. Two small objects hsgsggahahahahahshgsgegwfw
is density the degree of compactness of a substance?
energy loss happen when a filament bulb glow. Write a situation where this energy is used properly.
The use of energy for the purpose to boil water and warming the environment are the proper use of this lost energy.
How energy is properly utilized?The energy which is lost from the bulb is in the form of thermal energy. This thermal energy can be used to boil water or heating the surrounding environment so in this way the lost energy can be used properly.
So we can conclude that use of energy for the purpose to boil water and warming the environment are the proper use of this lost energy.
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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.
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.
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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a horse mass of 150kg it has force of 50n what is its acceleration
Remember, there's 2 types of accelaration formula.
1st formula :
a = ( final speed - initial speed ) ÷ time
2nd formula :
resultant force (f) = mass × a
or
a = resultant force (f) ÷ mass
So the ans shld be,
a = 50 x 150
= 7500 m/s²
The acceleration of the body is 0.33 m/s².
What is meant by acceleration of an object ?Acceleration of an object having mass is defined as the net force acting on the object per unit mass.
Here,
Mass of the body, m = 150 kg
Force acting on the body, F = 50 N
The net force acting on an object is defined as the product of mass and acceleration of the object.
The expression for the net force acting on the body is given by,
F = ma
Therefore, the acceleration of the body,
a = F/m
Applying the values of F and m,
a = 50/150
a = 0.33 m/s²
Hence,
The acceleration of the body is 0.33 m/s².
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3.Calculate the acceleration of a 1kg toy airplane that has been thrown with a force of 20N.
Answer:
The acceleration of a 1kg toy is 20m/s^2Explanation:
We are going to use the newtons law of motion (first law) to solve this problem
The expression is F=mawhere F is the force in Newton
m is the mass in kg and
a is the acceleration in m/s^2
given data
mass of the toy m= 1kg
force with which the toy is thrown = 20N
susbtituting we have
20=1*a
a= 20m/s^2
chemical formula Periodic acid
the chemical formula for periodic acid is HI04
I hope this helps you
:)
Which change will cause the gravitational force between a baseball and a soccer ball to increase? Select three options. Moving the balls closer together moving the balls farther apart wrapping the soccer ball in layers of duct tape using a baseball with a thinner leather removing the outer layer of the baseball putting the baseball in a plastic case.
The three options are 1,3 and 5 Moving the balls closer together. The distance decreases and forces increase.
What is the gravitational force?The gravitational force ia s type of force has the ability attracts any two objects with mass. Gravitational force tries to pull two masses towards each other.
The value of the gravitational force is given by;
[tex]F_g=\frac{ Gm_ 1m_2}{r^2}[/tex]
It is observed that the gravitational force is directly propotional to the product of mass and inversly propotional to the square of the distance between them.
So, the correct options are :
(1) Moving the balls closer together. The distance decreases and forces increase.
(3) Wrapping the soccer ball in layers of duct tape will also increase force because the mass will increase.
(5) Similarly, putting the baseball in a plastic case will increase mass, and hence force increases.
Hence the three options are 1,3 and 5.
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Please help! Sorry if its blurry
A 3,000 kg car rests on rough horizontal ground. A rope is attached to the car and is pulled with a force of 11,000N to the left. As a result, the car accelerates at 3m/s2. The coefficient of sliding friction between the car and the ground is _____ (round to the nearest hundredth)
Answer:.07
Explanation hop this helps
Answer:.07
Explanation:
What color will a green and red-striped shirt appear to be when only green light shines on it?
Answer:
Yellow
Explanation:
So while red, green and blue light shine upon the shirt, only red and green light will reflect from it. Red and green light striking your eye always gives the appearance of yellow; for this reason, the shirt will appear yellow.
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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What goes up but never ever comes down?
Answer:
Your age
Explanation:
When should scientific claims be questioned?
a. If you don't agree with them
b. If they are hard to understand
C. If they are based on a very small sample
d. If they are new
PER
Please select the best answer from the choices provided
Answer:
C) if they are based on a very small sample
1. 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
PLEASE HELP: A car is traveling at 72.0 km/h, when the driver notices an overturned truck blocking the road 95.0 m ahead. The car travels at 72.0 km/h for 0.50 s before the driver applies the brakes. (Please show work).
(a) How far does the car travel in that 0.50 s?
(b) If the car has an acceleration of -2.50 m/s², will it be able to stop before reaching the truck? If not, how fast is the car traveling when it collides with the truck?
Answer:
10 m
Yes, the car will be able to stop before it reaches the truck.
Explanation:
[tex]u=\text{Initial velocity of the car}=\dfrac{72}{3.6}=20\ \text{m/s}[/tex]
[tex]t=\text{Time}=0.5\ \text{s}[/tex]
[tex]s=\text{Displacement}[/tex]
From the laws of motion we have
[tex]s=ut+\dfrac{1}{2}at^2\\\Rightarrow s=20\times 0.5+0\\\Rightarrow s=10\ \text{m}[/tex]
The car will travel 10 m in 0.5 seconds
[tex]a=\text{Acceleration}=-2.5\ \text{m/s}^2[/tex]
[tex]v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-20^2}{2\times -2.5}\\\Rightarrow s=80\ \text{m}[/tex]
Total distance required for the car to stop is 10+80 = 90 m. So, the car will be able to stop before it reaches the truck.
The titanium shell of an SR-71 airplane would expand when flying at a speed exceeding 3 times the speed of sound. If the skin of the plane is 400 degrees C and the linear coefficient of expansion for titanium is 5x10 -6 /C when flying at 3 times the speed of sound, how much would a 10-meter long (originally at 0C) rod portion (1-dimension) of the airplane expand?
Answer:
The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.
Explanation:
From Physics we get that expansion of the rod portion is found by this formula:
[tex]\Delta l = \alpha\cdot l_{o}\cdot (T_{f}-T_{o})[/tex] (Eq. 1)
Where:
[tex]\Delta l[/tex] - Expansion of the rod portion, measured in meters.
[tex]\alpha[/tex] - Linear coefficient of expansion for titanium, measured in [tex]\frac{1}{^{\circ}C}[/tex].
[tex]l_{o}[/tex] - Initial length of the rod portion, measured in meters.
[tex]T_{o}[/tex] - Initial temperature of the rod portion, measured in Celsius.
[tex]T_{f}[/tex] - Final temperature of the rod portion, measured in Celsius.
If we know that [tex]\alpha = 5\times 10^{-6}\,\frac{1}{^{\circ}C}[/tex], [tex]l_{o} = 10\,m[/tex], [tex]T_{o} = 0\,^{\circ}C[/tex] and [tex]T_{f} = 400\,^{\circ}C[/tex], the expansion experimented by the rod portion is:
[tex]\Delta l = \left(5\times 10^{-6}\,\frac{1}{^{\circ}C} \right)\cdot (10\,m)\cdot (400\,^{\circ}C-0\,^{\circ}C)[/tex]
[tex]\Delta l = 0.02\,m[/tex]
The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.
A net force of 10. newtons acts on an object of mass 6.0 kilograms for 8.0 seconds. What is the magnitude of the change in the object's momentum?
A. 48 N-s
B. 60. N-s
C. 80. N-s
D. 480 N-s
Answer: A, B, C
Explanation: its either those:)
The magnitude of the change in the object's momentum will be equal to 80 N-s. Hence, option C is correct.
What is momentum?The momentum is the result of a particle's velocity and its mass. Force and motion, meaning it has both magnitude and the direction. According to Isaac Newton's second equation of motion, the force acting on a particle equals the time rate of increase of momentum.
The impulse, which is the product of the force and the intervals (the impulse), is equal to the difference in momentum, according to Newton's 2nd law, if a steady force operates on a particle for a specific amount of time. On the other hand, a particle's momentum is the amount of time needed for a consistent action to fight it to rest.
As per the given information in the question,
The initial momentum of the system is 0.
F = ma
a = F/m
a = 10/6
a = 1.67 m/s²
Use the equation of motion,
v = u + at
v = u + (1.67)(8)
v = 13.33 m
Then the momentum will be,
p = mv
p = 6 × 13.33
p = 80 N-s.
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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
Use the above formula to calculte work done.
Calculate the amount of work done by the force in moving the object through a distance of 9 m if an object is horizontally dragged
across the surface by a 130 N force acting parallel to the surface.
A-1170J
B-14J
C-507J
D-.070J
w=f.d
w=130.9
w=1170(a)
Answer:
A-1170
Explanation:
9x130=1170
dxf=w
A boy runs 125 meters north, and the. 75 meters south
Answer:
50 meters
Explanation:
50 meters
50 meters
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.
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
POSSIBLE POINTS:
Which distance can be most accurately measured with a meter stick?
The length of a river
The width of a book
The distance between two cities
The size of an object under a microscope
Answer:
Width of a book
Explanation:
A river is much wider than a meter (3’3”)
Width of a book will be a few inches to no more than a couple feet.
The distance between cities is hundreds and hundreds of meters.
A microscope is less than a couple inches.
a. Describe something that you do on a regular basis where friction slows you down (Use a different example than the ones in the lesson).
b. Describe two examples (different from the ones in the lesson) in which you have noticed friction creating thermal energy.
c. Describe two examples of activities that you do where you depend on friction, and would not be able to do them without friction. Please use different examples than the lesson.
Answer:
a. -For example, when you go to the supermarket with your parents and they let you drive the cart. You step on the back and push off which lets you get far in the isle, but in a bit you start slowing down
and eventually stop at all.
b. -First, when a car is driving the wheels meet friction all the time, as that happens the wheels get a bit hot.
-Second, when you are cold you rub your hands together fast until they are warm.
c.-First, you wouldn't be able to land an airplane correctly and it would be very, very hard to stop it from moving, as well as the car .
-We wouldn't be able to ice skate, we wouldn’t be able to slow down and turn normally.
Explanation:
(a) Friction is the force that opposes the rubber tyre from sliding on the road surface. This friction avoids skidding of vehicles. Applications of breaks in the vehicle to stop it- Friction braking is the most widely used braking method in vehicles.
(b) When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire.
(c)
Walking. Without friction between the shoes and the ground, you cannot walk properly. Driving. Writing. Rubbing of Hands for Warmth.Skating.Lighting Matchsticks.What is friction ?"Force that resists the sliding or rolling of one solid object over another." Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion.
What is kinetic energy ?"Kinetic energy is a form of energy that an object or a particle has by reason of its motion." If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
What is thermal energy ?"Thermal energy refers to the energy contained within a system that is responsible for its temperature." Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process.
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In most cases, absorbed light is converted into
Question 7 options:
heat
visible light
UV light
invisible light
Answer:
heat
When light hits an object, it either bounces off, and stays as light energy, or it is absorbed by the object. When it is absorbed, it is converted into heat energy, and the object heats up.
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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