1. a race car has a mass of 710 kg. it starts from rest and travels 40.0m in 3.0s. the car is uniformly accelerated during the entire time. how big is the net force acting on the car?
Answers
The net force acting on the car is 6300N.
Solution:We will employ the following equation of kinematics
\(x=1/2at^{2}\)
which describes an object traveling in one dimension with a constant acceleration and an initial velocity of zero.
We know the displacement and the time elapsed so we may solve for the acceleration:
\(40.0m=1/2a(3.0s)^{2}\)
Solving for a
\(a=8.89m/s^{2}\)
Now, knowing the acceleration of the car as well as the mass of the car we can apply Newton's second law, which states
\(Fnet=ma\)
\(Fnet=710kg⋅8.89m/s^{2}\)
\(=6311.9N\)
Considering the fact that our final answer should have only two significant digits, we will round to the nearest hundred:
\(Fnet = 6300N\)
What is force?Force is the application of physical force as a result of which an object moves.
What is velocity?Velocity is a vector described when speed is accompanied with direction.
What is acceleration?The rate of change of velocity with respect to time is called acceleration.
What is Newton's Second Law?The second law states that the acceleration of an object depends on two variables - the net force acting upon the object and the mass of the object.
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Related Questions
a(n) potential is the brief wave of positive electrical charge that sweeps down the axon.
Answers
The term that you are referring to is an action potential. An action potential is a rapid and brief wave of positive electrical charge that sweeps down the axon of a neuron.
It is initiated by a depolarization of the cell membrane and results in the transmission of an electrical signal from one neuron to another.
Action potentials are a crucial part of the nervous system and are responsible for a wide range of behaviors and functions, including movement, sensation, and cognition.
The process of generating an action potential involves a series of changes in the electrical potential across the neuron's cell membrane. Normally, the neuron's membrane has a resting potential, which is a stable negative charge inside the cell compared to the outside.
This resting potential is maintained by the balance of ions, such as sodium (Na+), potassium (K+), and negatively charged proteins, across the membrane.
When a neuron receives a stimulus, it can cause a brief depolarization of the cell membrane. Depolarization is a change in the electrical potential, resulting in a temporary reversal of the charge across the membrane.
This depolarization triggers the opening of voltage-gated ion channels, primarily sodium channels, in the neuron's membrane.
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Light is incident from above on two plates of glass, separated on both ends by small wires of diameter d = 0.600 µm. Consider only interference between light reflected from the bottom surface of the upper plate and light reflected from the upper surface of the lower plate, state whether the following wavelength gives constructive or destructive interference: (a) λ = 600 nm
Answers
The wavelength of λ = 600 nm gives constructive interference.
The condition for constructive interference is when the path difference between the two reflected rays is equal to an integer multiple of the wavelength. In this case, the path difference can be calculated as 2d, since the light reflects twice from the two surfaces of the plates. Given that the diameter of the wires is d = 0.600 µm, the path difference is 2d = 1.2 µm. Converting this to nanometers, we get 1200 nm. Since this path difference is equal to twice the wavelength of λ = 600 nm, we can conclude that the interference is constructive.
Therefore, the given wavelength of λ = 600 nm gives constructive interference between the reflected rays from the two plates.
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how do we calculate the value of work?
Answers
Answer:
Work = Force × Distance
Explanation:
Work = Force × Distance
The SI unit of work is Joule
-TheUnknownScientist
What is the dimensional formula for the following physical quantities
1. Power
2. Density
3. Work
Answers
Answer:
Power = [ML²/T³]
Density = [M/L³]
Work = [ML²/T²]
when you remove the division sign the exponents below will interchange to negative. hope you understand. All the best.
You push a box at a constant speed of 5m/s and let it go. It stops 1.5s later due to the force of friction. If you push the box at a speed of 12m/s, how long will it take to stop?
Answers
Answer:
the time taken for the box to stop is 3.6 s.
Explanation:
Given;
initial speed with which the box was pushed, u = 5 m/s
time taken for the box to stop, t = 1.5 s
Assuming the box is moving at constant acceleration, a;
\(a = \frac{u}{t} \\\\a = \frac{5}{1.5} \\\\a = 3.33 \ m/s\)
When the box is pushed a speed of 12 m/s, the time taken for the box to stop is calculated as;
\(t = \frac{v}{a} \\\\t = \frac{12}{3.33} \\\\t = 3.6 \ s\)
Therefore, the time taken for the box to stop is 3.6 s.
The question is attached
Answers
Answer:
The answer is B.
Explanation:
It is clear that the substance will be in liquid state above its melting point and below its boiling point.
A) This is incorrect. The substance is above the melting point but it is also above the boiling point (0 is greater than -183)
B) This is your correct answer. The substance is above the melting point and also below the boiling point.
C) This is incorrect. The substance is below both the melting point and the boiling point.
D) This is incorrect. The substance is drastically below the melting and boiling point.
Therefore , the only correct answer for this question would be B.
How many centimeters are there in 2.35m?
Answers
Answer:
there are 235cm in 2.35m
DATE
CLASS
14. The Space Shuttle must achieve a velocity of 7,800 m/s in order to orbit the
Earth If the average acceleration of the Space Shuttle is 15.3 m/s², how long will
It take for the shuttle to reach orbital velocity? Convert your answer from seconds
to minutes. Show all your work for this calculation.
Answers
Answer:
8.49673 minutes ≈ 8.5 minutes
Explanation:
Acceleration, a is defined as the rate of change in velocity divided by the change in time to attain that velocity
\(\mathsf a = \dfrac{\Delta v}{\Delta t} \\\\\textsf {where } \mathsf {\Delta v = v-v_0} \textsf{ v being final velocity and v_0 initial velocity}\), v = final velocity and v₀ the initial velocity
and Δt is the time required to attain final velocity
Δt = number of seconds since launch = t since t₀ = 0
Therefore,
\(a = \dfrac{v-v_0}{t}\)
The space shuttle's initial velocity is 0 m/s and its final velocity must be 7800 m/s to escape earth's gravity
So v - v₀ = 7800 - 0 = 7800 m/s, t - t₀ = t = 0 = t seconds
a = 15.3 m/s²
We have the equation
a = 7800/t
a is given as 15.3 m/s² so
15.3 = 7800/t
t = 7800/15.3 = 509.80392 seconds
To convert to minutes, divide by 60
509.80392/60 = 8.49673 minutes ≈ 8.5 minutes
A solid aluminum sphere of radius R has moment of inertia I about an axis through its center. What is the moment of inertia about a central axis of a solid aluminum sphere of radius 2R
Answers
Answer:
I1 = 2/5 M1 R^2 for a sphere about its center
I2 = 2/5 M2 (2 R)^2 = 2/5 M2 R^ * 4 = 8/5 M2 R^2
Remember that M2 is greater than M1 by a factor 0f 2^3 = 8
Then I2 exceeds I1 by a factor of 32
Which types of rocks (igneou, sedimentary, metamorphic) tend to have crystalline textures? How does this texture form?
Answers
Answer:
metamorpic rock
Explanation:
it has a crystallin textures
Calculate the power of a crane required to lift 36kg of iron per hour from a mine 200 m deep,
(Take g = 10m/s2 ).
Answers
hope this helps you !
A car starts from rest a stoplight and is traveling with a velocity of 10 m/s east in 20 seconds. What is the acceleration of the car?
Answers
Answer:
a = 0.2 m/s²
i sent u explanation before ...
what is the skydivers acceleration
Answers
According to newton’s first law of motion, an object that is moving will change its motion only if what kind of forces act on it?.
Answers
When an outside force acts on an object in motion, the object's motion will alter.
In the event that the forces acting on the object are balanced, what does Newton's first law state about a moving item?According to Newton's First Law of Motion, an object at rest will stay at rest unless another object applies an imbalanced force on it. Additionally, it asserts that a body in motion will continue to move in the same direction and at the same pace unless it is being affected by an imbalanced force.
What does the first law of motion for a moving object state?According to Newton's first law, unless it is affected by an unbalanced force, an item will either stay at rest or move at a constant speed in a straight line.
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An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him? less than 450 Hz more than 450 Hz 450 Hz 0 Hz.
Answers
Frequency is defined as the number of repetitions of waves occurring in 1 second. The frequency heard by the man as the ambulance move toward him will be greater than 450 Hz.
What is the frequency ?Frequency is defined as the number of cycles completed in 1 second. Frequency is given by the formula as,
\(\rm{Frequency =\frac{1}{time } }\)
As the formula shows frequency is inversely proportional to the time that shows if the time is decreasing frequency will increase and vice versa.
In the above case, the ambulance is moving toward the men. So that the time to meet up is decreased that's why the frequency will be greater than the initial frequency from the siren.
Hence the frequency heard by the man as the ambulance move toward him will be greater than 450 Hz.
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Answer: the answer is b more than 450 hz
Explanation: i took the test
A lithium atom combines with a helium atom to make a new larger atom this is an example of
Answers
Answer
Fission.
Explanation:
Fission occurs when a neutron slams into a larger atom, forcing it to excite and split into two smaller atoms, also known as fission products.
Hope this helps u ; )
What type of Circuit do they use in a home? WHY ? (Simple circuit / Parallel circuit / Series circuit) helpp
Answers
Answer:
Parallel
Explanation:
Most standard 120-volt household circuits in your home are (or should be) parallel circuits. Outlets, switches, and light fixtures are wired in such a way that the hot and neutral wires maintain a continuous circuit pathway independent from the individual devices that draw their power from the circuit.
Hope that helps :)
If a book weights p pounds and it is on a flat surface that is an angle of 0 degrees, the coefficient of static friction c for the book is given by c p csc O=p cot O
Answers
The coefficient of static friction c for the book when θ = 60° is 0.32.
What is Static Friction?Static friction is the friction force that tries to keep an object at rest. When an object is about to move the resistance it feels at the intial is the static friction.
Given that the funtion cp·cos(θ) = p·sin(θ). Simply the function for the value of c, therefore, it can rewritten as,
\(c\cdot p\cdot \cos(\theta) = p\cdot \sin(\theta)\)
Divide both the sides by p, the mass of the book;
\(c\cdot \cos(\theta) = \sin(\theta)\)
Divide both the sides by cos(θ);
\(\dfrac{c\cdot \cos(\theta)}{\cos(\theta)} = \dfrac{\sin(\theta)}{\cos(\theta)}\\\\\\c= \dfrac{\sin(\theta)}{\cos(\theta)}\\\\\\c = \tan(\theta)\)
Further, Substitute the value of θ as 60° in the above function,
c = tan(60°)
c = 0.32
Hence, the coefficient of static friction c is 0.32.
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The complete question is:
The amount of force needed to keep a stationary object on a flat surface from moving is called static friction. If a book weighs p pounds and it is on a flat surface that is at an angle of θ degrees, the coefficient of static friction c for the book is given by the equation below.
cp cos(θ) = p. sin(θ)
Solve for c when θ = 60°
A solid body weighs 30 kg. When placed on the floor, the area of contact is found to be 15 m2 . Find the pressure exerted by the solid body on the floor.
pls answer i need the answer quick
Answers
\(\\ \sf\longmapsto Force=ma\)
\(\\ \sf\longmapsto Force=30(10)=300N\)
Area=15m^2\(\\ \sf\longmapsto Pressure=\dfrac{Force}{Area}\)
\(\\ \sf\longmapsto Pressure=\dfrac{300}{15}\)
\(\\ \sf\longmapsto Pressure=20Pa\)
why are sciecntists so intrested in this group of organisms
Answers
Scientists are concerned in organizing living belongings into groups, or taxa, for a few reasons.
Why is taxonomy important?
First, taxonomy admits us to describe and appreciate the diversity of growth on Earth. By organizing creatures into groups based on their shared traits, scientists can better categorize and study them.
This information is essential for fields such as ecology, progress, and the conservation study of animals. Additionally, taxonomy supplies a framework for ideas among scientists and admits us to compare and contrast various organisms.
Finally, vocabulary helps us identify and name new class, which is important for pursuing changes in biodiversity over time.
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Below are a pair of wires holding a hanging light that weighs 50N. Is the tension in each of the wires less than 50N, 50N, or more than 50N?
Answers
Answer:
Less than 50N
Explanation:
Given that a pair of wires holding a hanging light that weighs 50N.
Since the hanging weight is equal to 50 N, the sum of the tension in the wires will also experience the same magnitude of force acting on the weight.
Considering each of the wire, the tension on each of the wire will surely be less than 50N
Therefore, the tension in each wire is less than 50N
a ball of mass 100g falls from a height of 5m and rebounds to a height of 3m . calculate the energy lost . (g=10ms-2)
Answers
Explanation:
use the explanation above
Hope it's clear
2. A roller coaster is at the top of a 72 m hill and weighs 150 kg. The coaster (at this moment) has
energy
anarov
Answers
Answer:
it is going down down down down the hill it goes so the roller coaster will then be down to a 0 m
a hydrogen atom is in its n = 4 state. in the bohr model, what is the ratio of its kinetic energy to its potential energy?
Answers
The Bohr model, the ratio of kinetic energy to potential energy for a hydrogen atom in its n = 4 state is -1.
In the Bohr model of the hydrogen atom, the energy levels are given by the equation:
E = -13.6 eV / n^2
where n is the principal quantum number.
The kinetic energy (KE) of the electron in the n = 4 state is given by the difference in energy between the n = 4 state and the n = ∞ (ionization) state:
KE = |-13.6 eV / 4^2 - (-13.6 eV / ∞^2)| = |-13.6 eV / 16 - 0| = 0.85 eV
The potential energy (PE) of the electron in the n = 4 state is given by the energy of the n = 4 state:
PE = -13.6 eV / 4^2 = -0.85 eV
The ratio of kinetic energy to potential energy is:
KE / PE = 0.85 eV / (-0.85 eV) = -1
Therefore, in the Bohr model, the ratio of kinetic energy to potential energy for a hydrogen atom in its n = 4 state is -1.
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A runner with a mass of 78.6 kg, moving at a speed of 8.8 m/s, rounds a bend with a radius of 25 m. What is the centripetal force needed to keep this runner on the curve and what supplies this force?
Answers
Answer: Does this help???
The centripetal force is required.
The centripetal force is 243.47 N.
m = Mass of runner = 78.6 kg
v = Velocity of runner = 8.8 m/s
r = Radius = 25 m
Centripetal force is given by
\(F_c=\dfrac{mv^2}{r}\\\Rightarrow F_c=\dfrac{78.6\times 8.8^2}{25}\\\Rightarrow F_c=243.47\ \text{N}\)
The centripetal force is 243.47 N.
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Macro put a pot of water on eggs. Half an hour later, he returned to find the pot dry. This is an example of.
Answers
Macro put a pot of water on eggs. Half an hour later, he returned to find the pot dry. This is an example of vaporization.
In the field of science, vaporization can be described as a process by which the liquid can be evaporated to a gaseous phase.
Vaporization can occur either due to boiling or evaporation.
In the situation above, as Macro has put a pot of water in eggs. As he kept the water on boiling for half an hour, the liquid water evaporated and changed into gaseous form.
As a result, all the water dried from the pot. This process is an example of vaporization.
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Which graph shows the change in velocity of an object in free fall?
Answers
Answer:
C!
Explanation:
I just did the test !
Please stay safe and wear a mask , we are in the mist of a pandemic ! !
The graph shows the change in velocity of an object in free fall is according to option C.
What is free falling?When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.
When an object is made to fall freely, it's velocity is only depended on the acceleration due to gravity, g. The velocity decreases till it become zero.
Thus, the correct option is C.
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a system absorbs 35J of heat and in the process it does 11J of work if the initial internal energy is 205J a,what is the final internal energy b,the system follows a different thermodynamic path to the same final state and does 15J of work, what is the heat transferred ?
Answers
Answer:
\(a)uf = 205 + 35 - 11 \\ = 240 - 11 \\ = 229j \\ b)q(heat \: transferd) = 229 - 205 - 11 \\ = 24 - 11 \\ = 13j \\ thank \: you\)
The heat transferred is
a) u f = 205+35-11
=240-11
= 229 j
b) q (heat transferred ) = 223-205-11
= 24-11
= 13 j
What is the difference between course and process in thermodynamics?
While a thermodynamic gadget passes thru an exchange in the state, a succession of states exceeded could be termed as a course of the device or direction of an alternate country. If the route of change of kingdom is completely distinctive, route of alternate of the nation may be termed as thermodynamic manner.
The technique is described via a direction, which is the non-stop collection of consecutive states via which the machine passes, consisting of the initial nation, the intermediate states, and the very last state. The process has a course along the course.
An asset whose price would not depend upon the course taken to attain that unique price is thought to as kingdom capabilities or point features. In contrast, those capabilities which do depend upon the direction from points are referred to as course features.
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Electric potential differences are measured in _____.voltsjoulesnewtonscentimeters
Answers
The correct unit used to measure the electric potential difference is Volts.
Joules is used to measure energy.
Newtons is used to measure forces.
Centimeters is used to measure distance.
Therefore the correct option is the first one.
to avoid landing at the wrong airport or on the wrong runway, a
pilot should?
Answers
Pilots can prevent landing at the wrong airport or on the wrong runway by adhering to established procedures and employing various navigational aids.
Pilots can employ several measures to prevent landing at the wrong airport or on the wrong runway. Firstly, they should carefully review and follow established procedures provided by air traffic control (ATC) and the airport authority. This includes verifying the assigned runway and using the correct approach and landing charts. Secondly, pilots should make use of navigational aids such as instrument landing systems (ILS), global positioning systems (GPS), and visual aids like runway markings and signage.
These aids help pilots to accurately identify their intended destination and runway. Maintaining situational awareness throughout the flight is crucial, and pilots should cross-reference visual cues with navigational aids to ensure they are on the correct path. In cases of uncertainty or confusion, pilots should communicate with ATC to clarify any discrepancies or seek guidance. By diligently following procedures and utilizing navigational aids, pilots can significantly reduce the risk of landing at the wrong airport or on the wrong runway.
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