Answers
According to the Velocity vs Time graph:
at A: car is moving with increased velocity with time
at B: the car is stationary or at uniform velocity
at E: the car is slowing down or its velocity decreases with time.
What is velocity, exactly?
The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.
When an item is moving, its velocity is the rate at which it is changing position as seen from a certain point of view and as measured by a specific unit of time.
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Related Questions
Select all the correct answers.
A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder?
it has no energy because it's being held still
It has gravitational potential energy because of its height.
its atoms and molecules have thermal energy
It has motion energy because it will fall if let go
its kinetic energy is being converted to potential energy
ghts reserved
Answers
it has no energy because its being held still
it has motion energy because it will fall if let go
the magnitude of kilogram is same all over the world give reason
Answers
The SI unit is a unit of measurement that is a globally recognized system that is used for technical and scientific activities.
The kilogram, which corresponds to the mass of the international prototype of the kilogram, is the SI base unit of mass.
The weight of a specific international prototype constructed of platinum-iridium and stored at the International Bureau of Weights and Measures is referred to as one kilogram.
Initially, it was specified as being equal to the mass of one litre (10-3 cubic metres) of pure water. A mass of 1 kg weighs around 2.20 pounds (lb) at the surface of the Earth.
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Classify the following situations into contact and non-contact forces.
(a) Applying brakes in a vehicle
(b) a coconut falling from a coconut tree
(c ) the planets revolving around the sun
(d) a ball is rolling on ground.
Answers
Answer: Contact force
a. Applying break in a vehicle.
d. The speed of ball rolling on ground is reduced
Non contact force
b. A coconut falling from a coconut tree.
c. The planets revolving around the sun.
Explanation:
The contact force is the force which exerts when one object or entity comes in contact with other object or entity. For example, on application of break the vehicle stops, the force is applied on the breaks to stop the vehicle. The ball rolling on the ground the speed reduces so the application of force on the ground also reduces.
The non contact force is the force one object exerts on the other without coming in direct contact with the other object. The force exerted by one object on other due to gravity is a non contact force. The coconut falling on the ground and planets revolving around the sun are examples of non contact force due to gravity.
I need help on this question!
Answers
Answer:
All of these
Explanation:
Have a great day!
Answer:
D
Explanation:
this is because the EMS is arranged according to all these factors, the most dangerous waves are the smallest
4 x10^4
---------------
3.63 x 10^-4
O 1.10 x 10^8
O 2.36 x 10^-8
O 2.36 x 10^-3
Answers
Seismic waves, known as P – waves, and S – waves can be use to study the earths interior, which otherwise would have be been impossible to explore. Which properties of P Dash and S – waves allow the study of earths interior.
(Multiple choice)
A. They travel at varying speeds, depending on the composition of layer.
B. They deflected while passing through layers of different compositions.
C. They are produced during earthquakes and volcanic eruptions.
D S – waves cannot pass through a layer of liquid composition
Answers
A. They travel at varying speeds, depending on the composition of layer.
B. They are deflected while passing through layers of different compositions.
D. S-waves cannot pass through a layer of liquid composition.
P-waves (primary waves) and S-waves (secondary waves) are two types of seismic waves generated by earthquakes and other sources of seismic activity. These waves travel through the Earth's interior and are affected by the physical properties of the different layers they pass through.
P-waves are compressional waves that travel through solid and liquid materials, and they move faster than S-waves. They can travel through the Earth's core and are refracted and reflected as they pass through layers of different densities, allowing scientists to study the interior of the Earth.
S-waves are transverse waves that can only travel through solid materials, and they move slower than P-waves. When they encounter a layer of liquid material, they are unable to pass through it and are reflected back to the surface, creating a shadow zone on the opposite side of the Earth from the earthquake. This allows scientists to determine the size and shape of the Earth's liquid outer core.
Thus, options A, B, and D are correct, and option C is incorrect because both P-waves and S-waves are produced during earthquakes and volcanic eruptions.
What is the linear diameter (in meters) of an object that has an angular diameter of 110 arcseconds and a distance of 25,000 m?
Answers
Answer:
Explanation:
angle θ = 110 arcsec
= 110 /60 arcmin
= 1.8333 arcmin
= 1.8333 / 60 degree
= .030555 degree
= .030555 x π / 180 radian
= 5.33 x 10⁻⁴ radian .
linear diameter = angular diameter in radian x distance
= 5.33 x 10⁻⁴ x 25000
= 13.325 m
linear diameter of object = 13.325 m .
Sulfur difluoride consists of a central sulfur atom and a fluorine atom on each side. Draw a model of the molecule formed by putting lines between the atoms to represent bonds so that each atom has the correct number of bonds.
Answers
Answer:
F - S - F
Explanation:
Answer:
F-S-F
Explanation:
PLATO ANSWER
A lump of clay with a mass of .50.0 g is moving south at a speed of 20.0 cm/s. It collides head on with a second lump of clay with a mass of 70.0 g that is moving north at a speed of 40.0 cm/s. The two lumps stick together, and no external horizontal forces act on the system. What is the velocity of the combined lump after the collision?
Answers
The velocity of the combined lump after the collision is 39.5 cm/s, which is the average velocity of the two lumps before the collision.
To solve this problem, we can use the principle of conservation of momentum, which states that the total momentum of a system before a collision is equal to the total momentum of the system after the collision, provided there are no external horizontal forces acting on the system.
The momentum of an object is equal to its mass multiplied by its velocity. Therefore, we can calculate the total momentum of the system before the collision as:
Total momentum before collision = (0.50 g) × (-20.0 cm/s) + (70.0 g) × 40.0 cm/s
= -10.0 g·cm/s + 2800.0 g·cm/s
= 2790.0 g·cm/s
Since the two lumps stick together after the collision, their masses combine to form a single lump. Let's call the velocity of the combined lump after the collision "v". We can then calculate the total momentum of the system after the collision as:
Total momentum after collision = (0.50 g + 70.0 g) × v
= 70.50 g × v
According to the principle of conservation of momentum, the total momentum before the collision is equal to the total momentum after the collision. Therefore, we can equate these two expressions and solve for "v":
Total momentum before collision = Total momentum after collision
2790.0 g·cm/s = 70.50 g × v
v = 2790.0 g·cm/s ÷ 70.50 g
v = 39.5 cm/s
This result can be explained by the fact that, in the absence of external horizontal forces, the momentum of the system is conserved, and the total mass of the system remains constant.
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Q5. Which of the following is NOT true about gravity?
A). The more massive two objects are, the greater the
gravitational force between them.
.B). Gravitational force between two objects depends
only on the mass of the larger object.
.C). Gravitational force between two objects depends on
the distance between them.
.D). People can jump higher on the moon than on Earth
because the gravitational force between a person and
the moon is lower than the gravitational force between
a person and the Earth.
.E). A gravitational force exists between the moon and
the sun.
Answers
C. Gravitational force between two objects depends
only on the mass of the larger object is NOT true about gravity
What is Gravitational force?Gravity is a fundamental interaction that causes all entities with mass or energy to attract one other.
In nature, there are no other sorts of gravity. This indicates that based on their masses and the distance between their centers, there is only one form of gravitational force pulling the two bodies together.
Gravity is the weakest force known in nature and is a form of central force.
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Which type of force enables all the matter made up of atoms to exist?
A. Electromagnetic
B. Normal
C. Strong nuclear
D. Gravitational
Answers
Answer:
D
Explanation:
Answer:
The answer is C. Strong Nuclear
Explanation:
I took this test and it was correct!
Elements known as noble gases do not have the ability or the room in their valence
electron shell to form bonds with other elements.
O True
O False
Answers
Answer:
true
Explanation:
noble gases are octet meaning they they have eight electrons in their outer shell so the are stable
Prove the formular for calculating attraction
Answers
The formula for calculating attraction is F=GMmr².
Gravitational attractionGravitational attraction is the force of attraction that occurs on all bodies
which have a mass as a result of the force of gravitational force.
The Force is directly proportional to the product of their masses and
inversely proportional to the square of the distance between them.
Gravitational attraction = F=GMmr².
where F is the Force, G is gravitational constant, M and m are masses and r²
is square of the distance between the masses.
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Which force does the shuttle overcome to create an unbalanced net force as it initially lifts from the ground?
Air resistance
Friction
Gravity
Thrust of rocket engine
Answers
Hello!
The answer is Gravity. Lets take a look at the options:
A. Nope, this would be if the shuttle was going horizontal.
B. Again, this would be if the shuttle was going horizontal.
C. Yes! This is the only force that is being overcome by using the rocket thrusts to move up.
D. No, the shuttle is using its thrust rocks to push against gravity.
I hope this helps! :)
A force of 200 N toward north is exerted on an object with a mass of
40.0 kilograms. What is the acceleration?
Answers
Taking into account the Newton's second law, the acceleration of the object is 5 m/s².
Newton's second lawNewton's second law states that this force will change the speed of an object because the speed and/or direction will change and these are called acceleration.
Newton's second law states that: "The acceleration of an object is directly proportional to the force acting on it and inversely proportional to the mass."
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N]m = Mass [kg]a = Acceleration [m/s²]Acceleration in this caseIn this case, you know:
F= 200 Nm= 40 kga= ?Replacing in the definition of Newton's second law:
200 N= 40 kg× a
Solving:
a= 200 N÷40 kg
a= 5 m/s²
Finally, the acceleration is 5 m/s².
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A disc rotates about a fixed axis with an initial angular velocity of 5.0 rad/s counterclockwise. Upon completing 2 revolutions, the disc has an angular velocity of 2.5 rad/s.
(a) Find the angular acceleration of the disc. (Ans : -0.75 rad/s2 )
(b) Calculate the time taken by the disc to complete the 2 revolutions. (Ans : 3.33 s)
(c) If the disc maintains the same constant angular acceleration until it reaches 2.5 rad/s clockwise, sketch the graph of angular velocity versus time from 5.0 rad/s counterclockwise to 2.5 rad/s clockwise.
Answers
Answer:
A
Explanation:
4. The period of the sound wave produced by a 440 Hz tuning fork is
Answers
Answer:
.002273 seconds
Explanation:
1/f = period
1/ 440 c/s = .002273 seconds
A snail con move at 3cm/s if it’s ke is 300joules what it it’s mass?
Answers
Explanation:
V = 3 cm/s = 0.03 m/s. BY THE FORmULA OF K.E. K.E = 1/2 mV^2. 300 =1/2 m (0.03)^2. m = 300 x 2/0.0009.
A soccer ball, kicked from ground level at an angle of 64.0° above horizontal, is in the air for 3.40 s. What was its initial speed, in m/s, just after it was kicked? Ignore air resistance.
Answers
A soccer ball, kicked from ground level at an angle of 64.0° above horizontal, is in the air for 3.40 s. The initial speed, in m/s, just after it was kicked will be 76.07 m/s
The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.
given
v = 0
g = 9.8 m/\(s^{2}\)
t = 3.40 s
u = ?
cos(theta) = 64°
v = u*cos(theta) - g*t
0 = u * cos(64) - 9.8*(3.40)
u = 76.07 m/s
The initial speed, in m/s, just after it was kicked will be 76.07 m/s
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Drive-reduction theory states that motivation comes from a combination of both reinforcement and drive.
ОА.
True
OB. False
Answers
A falling object with a mass of 2.55 kg encounters 4.0 N of air resistance. What is the acceleration of the object? (Choose up to be the positive direction, and remember the definition of weight).
Question 9 options:
a)
-21 N
b)
-241.0 m/s2
c)
-21.0 m/s2
d)
-8.2 m/s2
e)
8.2 m/s2
Answers
The acceleration of the falling obeject of mass 2.55 kg is -8.2 m/s². And the right option is d) -8.2 m/s².
What is acceleration?This can be defined as the rate of change of velocity.
To calculate the acceleration of the object, we use the formula below.
Formula:
a = (R-mg)/m............. Equation 1Where:
a = Acceleration of the objectm = Mass of the objectR = Air resistanceg = Acceleration due to gravity.Note: Taking forces acting upward to be positve and downward force to be negatove,
From the question,
Given:
R = 4 Nm = 2.55 kgg = 9.8 m/s²Substitute these values into equation 2
a = [4-(2.55×9.8)]/2.55a = -20.99/2.55a = -8.2 m/s²Hence, The acceleration of the object is -8.2 m/s².
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Blocks 1 and 2 are connected by a light string that passes over a pulley with negligible mass and friction, as shown in the figure. Block 1 is on a table covered with two different materials, A and B. The two-block system is released from rest, and the speed of block 1 begins to increase. When block 1 reaches material B, its speed increases at a greater rate. Which of the following correctly compares the coefficient of kinetic friction m between block 1 and the two materials and describes the change in the magnitude of the net force on block 2 as block 1 slides from material A to material B?
Answers
The coefficient of kinetic friction on material B is greater than material A, causing an increase in net force on block 2.
The coefficient of kinetic friction between block 1 and material B is greater than that between block 1 and material A, which causes an increase in the net force acting on block 2 as block 1 slides from material A to material B.
This is because the increased friction on material B results in a greater opposing force to the motion of block 1, which in turn causes a greater tension force on the string and therefore a greater net force on block 2.
This effect is due to the properties of the different materials and the interaction between the materials and the block, which ultimately determine the amount of friction present and the resulting force acting on the system.
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What is sound waves
Answers
Sound waves are a type of mechanical wave that propagate through a medium, typically air but also other materials such as water or solids.
Characteristics of sound wavesFrequency: the frequency of a sound wave refers to the number of cycles or vibrations it completes per second and is measured in Hertz (Hz).
Amplitude: the amplitude of a sound wave refers to the maximum displacement or intensity of the wave from its equilibrium position. It represents the loudness or volume of the sound, with larger amplitudes corresponding to louder sounds and smaller amplitudes corresponding to softer sounds.
Wavelength: the wavelength of a sound wave is the distance between two consecutive points in the wave that are in phase, such as from one peak to the next or one trough to the next. It is inversely related to the frequency of the wave.
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Whose data did Kepler use to describe the motion of the planets?
Tycho Brahe
Nicolaus Copernicus
Ptolemy
Galileo Galilei
Answers
Answer:
Tycho Brahe
Explanation:
Tycho Brahe's accurate observations of planetary positions provided the data used by Johannes Kepler to derive his three fundamental laws of planetary motion.
Answer:
A. Tycho Brahe
Explanation:
the person above is correct :)
A submarine dove hundreds of feet from the surface of the ocean toward the oceans floor what is the potential energy stored
Answers
Potential energy is a form of accumulated energy that an item or set of objects may have depending on their size, shape, location, or even substance.
What is a simple definition of potential energy?Potential energy is the energy retained by an object as a result of its location relative to other objects, internal stresses, electric charge, or other variables. Although it has ties to the old Greek philosopher Aristotle's idea of potentiality, the word potential energy was coined by the 19th-century Scottish engineer and physicist William Rankine.
The gravitational potential energy of an object, the elastic potential energy of a stretched spring, and the electric potential energy of an electric charge in an electric field are all examples of common kinds of potential energy.
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Ignoring mass and weight contributed by fuel, what happens when the space shuttle takes off and moves away from earth?
Answers
Answer:
Its mass increases and weight decreases. Its mass remains constant and weight decreases.
Answer in your PE notebook
I have learned that
I have realized that
I will apply
Answers
Answer:
physical science is important
hety
civil engineering
An electron in a region where there is an electric field experiences a force of magnitude 3.1 10-16 N. What is the magnitude of the electric field at the location of the electron?
Answers
Answer:
1.938*10^3N/C
Explanation:
Using F= qE
E= F/q
Where q= 1.6x10-19
So 3.1*10^-16/1.6*10^-19
= 1.938*10^3N/C
Explanation:
A piece of wood 350 mm × 350 mm and 15 mm thick conducts heat through its thickness under steady state conditions. The rate of heat flow is measured to be 14.0 watts when the temperature difference is 28 C°. Determine the coefficient of thermal conductivity for this wood
Answers
The coefficient of thermal conductivity (k) is related to the rate of heat flow (Q), the cross-sectional area (A), the length (L), the temperature difference (ΔT), and the thermal resistance (Rth) by the following equation:
k = Q / (A * ΔT * L) = Rth * (A * ΔT)
Reorganizing this equation gives:
Rth = k / (A * ΔT)
The given information in the problem is:
Rate of heat flow (Q) = 14.0 watts
Thermal resistance (Rth) = (350 mm × 350 mm × 15 mm) / (14.0 watts) = 31.5 mm⁴/C
Temperature difference (ΔT) = 28°C
Substituting these values into the equation, we have:
k = Q / (A * ΔT) = 14.0 W / (0.35 m² * 28°C) = 1.94 W/mK
So the coefficient of thermal conductivity (k) for this wood is approximately 1.94 W/mK.
2. A 6.0 kg mass is pulled along a horizontal surface where the coefficient of friction is 0.20.
a) What is the friction force acting on the mass?
b) What force is needed to accelerate it at 0.68 m/s^(2)?
Answers
Answer:
Below
Explanation:
a) To find the force of friction acting on the mass we can use this formula :
friction = coefficientoffriction x normal force
First we need to find the normal force of this object :
Fn = mg
= (6.0)(9.8)
= 58.8 N
Now we can find the force of friction acting on the object :
friction = (0.20)(58.8N)
= 11.76 N
= 12 N (we round this to 2 sig figs)
b) To find the force needed to accelerate this object at 0.68 m/s^2 use this :
F = ma
0.68 = x - 11.76 / 6
x = 15.84
x = 16 N
Hope this helps! Best of luck <3