The cart is pulled at a constant velocity, so it is in equilibrium. In particular, the net horizontal force is zero, and consists of only the pulling force and friction such that
p - f = 0
where p and f denote the magnitudes of the pulling force and friction.
So we have
p - 12 N = 0
p = 12 N
What is responsible for keeping an object at rest or maintaining an object's
constant velocity?
Answer:
Inertia
Explanation:
Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity.
What is the kinetic energy of a 4-kg toy car moving at a velocity of 8 m/s?
O 32J
64 J
O
128 J
256 J
Answer:
128 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 4 \times {8}^{2} \\ = 2 \times 64[/tex]
We have the final answer as
128 JHope this helps you
Mass of toy the car = 4 kg
Velocity of toy the car = 8 m/s
Kinetic energy of an object is the energy that it possesses due to its motion.
Kinetic energy is directly proportional to the mass of the object and to the square of its velocity.
Formula of Kinetic energy:
[tex] \boxed{ \bf{KE = \dfrac{1}{2}mv^2}}[/tex]
KE → Kinetic energy of the Object (J)
m → Mass of the Object (kg)
v → Speed of the Object (m/s)
By substituting values in the formula, we get:
[tex] \rm \longrightarrow KE = \dfrac{1}{2} \times 4 \times 8^2 \\ \\ \rm \longrightarrow KE = \dfrac{1}{2} \times 4 \times 64\\ \\ \rm \longrightarrow KE = 2 \times 64 \\ \\ \rm \longrightarrow KE = 128 \: J[/tex]
[tex] \therefore [/tex] Kinetic energy of the toy car = 128 J
A book rest on a table. The book pushes downward on the table with a force of 8 N According to Newton's 3rd law of motion, what prevents the book from accelerating downward?
Answer:
In the case of the table and the book, the gravitational attraction is absolutely negligible, since they are both so tiny. The force that the table experiences because of the book is what is being called normal force. The table then exerts an equal and opposite force.
Explanation:
Explanation:
The law of motion states that for every action there is an equal yet opposite reaction. so that mean that the book is being acted on by another force which would be the table. It does not move because the table is acting on it with 8n of upward force creating an equilibrium keeping the book at rest.
Write 3 paragraphs explaining conduction, convection, and radiation. The paragraph must include examples of each and explain the type of energy. It also must include conductors and insulators and various examples of each.
Answer:
Eeeeeeeeeeeeeeeeeeeeeeeeeee
6. A person lifts a package weighing 75 N. If she lifts it 1.2 m off the floor,
what is the packages potential energy?
Answer:
90J
Explanation:
Given parameters:
Weight of package = 75N
Height = 1.2m
Unknown:
Potential energy = ?
Solution:
Potential energy is energy due to the position of a body. It is mathematically expressed as;
Potential energy = mgh
m is the mass
g is the acceleration due gravity
h is the height
The weight is mg
Potential energy = 75 x 1.2 = 90J
The diagrams below show forces acting on a toy car as it moves to the right which diagram shows the toy car that will most likely accelerate to the right based on these conditions?
Answer:
Option 1.
Explanation:
To know which option is correct, let us calculate the net force in each case to know which will move to the right direction.
Option 1:
Force to the right (Fᵣ) = 8 N
Force to the left (Fₗ) = 6 N
Net force (Fₙ) =?
Fₙ = Fᵣ – Fₗ
Fₙ = 8 – 6
Fₙ = 2 N to the right
Option 2:
Force to the right (Fᵣ) = 8 N
Force to the left (Fₗ) = 10 N
Net force (Fₙ) =?
Fₙ = Fₗ – Fᵣ
Fₙ = 10 – 8
Fₙ = 2 N to the left
Option 3:
Force to the right (Fᵣ) = 10 N
Force to the left (Fₗ) = 10 N
Net force (Fₙ) =?
Fₙ = Fᵣ – Fₗ
Fₙ = 10 – 10
Fₙ = 0 (no movement)
Option 4:
Force to the right (Fᵣ) = 10 N
Force to the left (Fₗ) = 13 N
Net force (Fₙ) =?
Fₙ = Fₗ – Fᵣ
Fₙ = 13 – 10
Fₙ = 3 N to the left
From the illustrations made above, only option 1 has a net force toward the right direction. Therefore, only option 1 will have an acceleration towards the right direction.
Answer:
Option 1
Explanation:
A 1235 kg whale swims horizontally at a speed of 6.4 m/s. It suddenly collides directly with a stationary seal of mass 189 kg. The seal grabs onto the whale and holds fast. What is the speed of these two sea creatures just after their collision?
Answer:
The speed of these two sea creatures just after their collision is 5.55 m/s.
Explanation:
Given;
mass of the whale, m₁ = 1235 kg
initial speed of the whale, u₁ = 6.4 m/s
mass of the seal, m₂ = 189 kg
initial speed of the seal, u₂ = 0
let their final speed after collision, = v
Apply the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
(1235 x 6.4) + (189 x 0) = v(1235 + 189)
7904 = 1424v
v = 7904 / 1424
v = 5.55 m/s
Therefore, the speed of these two sea creatures just after their collision is 5.55 m/s.
A body can have zero average velocity but not zero average speed. Why?
What’s the answer to this question
Answer:
space = 66.24 [m]
Explanation:
To solve this problem we must remember that the average speed is defined as the relationship between a space traveled over a certain time.
[tex]Av = \frac{space}{time}[/tex]
where:
space [m]
Av = average velocity = 3.6 [m/s]
time = 18.4 [s]
[tex]space = 3.6*18.4\\space = 66.24 [m][/tex]
A machinist measures the length of a bolt. The length is 72.22 cm. What is the length in millimeters?
Answer:
The length of the bolt in millimeters is 722.2 mm
Explanation:
Given;
length of the bolt in centimeters, = 72.22 cm
The length of the bolt in millimeters is given by;
Multiply the length by 10
= 72.22 cm x 10
= 722.2 mm
Therefore, the length of the bolt in millimeters is 722.2 mm
what is da answer please i need help
Answer:
Air and water i think
Explanation:
Cause Air =25% and water=25% so that equals 50%
if a satellite travels 62,000,000 miles from earth, how can we write it in scientific notation
Answer:
6.2 x 10^6
Explanation:
The 6 at the end is an exponent the carrot is the symbol
Answer:
6.2*10^7 miles
Explanation:
Nicki rides her bike at a constant speed for 6 km. That part of her ride takes her 1 h. She then rides her bike at a constant speed for another
km. That part of her trip takes her 2 h. What is her average speed?
Answer:
Nicki's Average Speed is 6 km
Explanation:
If Nicki rides her bike at a constant speed for 1 hour, that means that Nicki will stay at a constant rate for another 2 hours.
Thus your answer: 6 km
What happens when you pay bills using a computer
Answer:
Money is transferred from your account to creditors' accounts
Explanation:
When performing online activities that require payments of bills on a computer. The very moment you decided to pay your bills using a computer, your money will be transferred immediately from your account to creditors' accounts. This will imply that the transaction is successful and you have paid your bills.
Hence, in this case, the correct answer is "Money is transferred from your account to creditors' accounts."
Answer:
U become g**
Explanation:
Ur a**
A screen is placed 50.0 cm from a single slit, which is illuminated with light of wavelength 690 nm. If the distance between the first and third minima in the diffraction pattern is 3.00 mm, what is the width of the slit?
Answer:
d = 2.3 x 10⁻⁴ m = 0.23 mm
Explanation:
In a Young's Double Slit experiment the distance between two consecutive minima is given as:
Δx = λL/d
for, the distance between the 1st and 3rd minima it will become:
2Δx = 2λL/d
where,
2Δx = distance between 1dt and 4rd minima = 3 mm = 0.003 m
λ = wavelength = 690 nm = 6.9 x 10⁻⁷ m
L = Distance of Screen = 50 cm = 0.5 m
d = width of slit = ?
Therefore,
0.003 m = 2(6.9 x 10⁻⁷ m)(0.5 m)/d
d = 6.9 x 10⁻⁷ m/0.003 m
d = 2.3 x 10⁻⁴ m = 0.23 mm
true or false gravitational pull decreases with an increase of distance between two objects
Answer:
true! : )
(i underlined the place where the answer is the other information is just as important but if you do not want to read it you do not have to)
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases. the greater the mass, the greater the gravitational pull. gravitational pull decreases with an increase in the distance between two objects. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.
(60 points pls help thx)a worksheet on calculating speed
(3x104 kg) (4 x 104 m)
6 x 104 s
Answer:
77852x∧100 kgms
Explanation:
How much would you have to eat for your appendix to explode ? I ate so much on thanksgiving and i need to know i’m very scared
Answer:
I don't think your appendix can explode because you ate too much honestly. It's not even possible to eat so much that your appendix explodes, and if you're feeling any pain it definitely isn't because your appendix is about to explode, believe me. Also you could just type it into the internet, that'd be a much faster solution.
HELLPPPP PLZZZ
10. Identify Which gas law
does this graph represent.
How does simple machines make work easier?
The simple machines can help make work easier by working quicker than the people and making other peoples jobs easier.
Explanation:
I hope this helped.
If we increase the driving frequency in a circuit with purely resistive load, how do the amplitudes VR and IR change?
Answer:
V = I R
expression does not depend on the frequency, so when changing this quantity does not change the voltage or the current in the circuit.
Explanation:
In a purely resistive circuit, the Ohm relation, m for which
V = I R
We see that the previous expression does not depend on the frequency, so when changing this quantity does not change the voltage or the current in the circuit.
This does not happen in circuits with capacitors or inductors where there is an explicit dependence on frequency.
A 1100 kg sports car accelerates from 0m/s to 32m/s in 10 seconds. What is the average power of the engine?
Answer:
The average power of the engine of the sports car is 56.32 kW
Explanation:
Given;
mass of the sports car, m = 1100 kg
initial velocity of the sports car, u = 0 m/s
final velocity of the sports car, v = 32 m/s
time of motion, t = 10 s
The kinetic energy of the car is given by;
K.E = ¹/₂m(v² - u²)
K.E = ¹/₂mv²
K.E = ¹/₂ x 1100 x 32²
K.E = 563200 J
The average power of the engine of the sports car is given by;
Pavg = Energy / time
Pavg = 563200 / 10
Pavg = 56320 W
Pavg = 56.32 kW
Therefore, the average power of the engine of the sports car is 56.32 kW
750 kg car zooms away from a red light with an acceleration of 7.8 m/s squared . What is the average net force in Newtons that the car experiences?
Answer:
5850 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 750 × 7.8
We have the final answer as
5850 NHope this helps you
give a strong idea to protect , purify and the beautify of the Dal lake
Answer:
Water in dal lake is test for any heavy metals and pollutant, sewage and drainage system are also monitored for the same.
Explanation:
Dal lake is located in Srinagar that is the state capital of Kashmir and is known for recreation and tourism purposes. The area covers about 18 km sq. and forms a part of natural wetlands. The lake is prone to pollution and has recently undergone restoration measures. To address the problems of eutrophication algae and large-scale microplankton have been removed from the water. The government of India has taken various measures to check the pollution by setting up a committee to monitor the proper use of allotted funds.A proton moves at a speed of 850 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.70 T. What is the magnitude of the magnetic force on the proton?
Answer:
The magnitude of the magnetic force on the proton is 9.532 x 10⁻¹⁷ N
Explanation:
Given;
speed of proton, v = 850 m/s
magnitude of magnetic field, B = 0.7 T
Charge of proton, q = 1.602 x 10⁻¹⁹ C
The magnitude of the magnetic force on the proton;
F = qvB
F = ( 1.602 x 10⁻¹⁹)(850)(0.7)
F = 9.532 x 10⁻¹⁷ N.
Therefore, the magnitude of the magnetic force on the proton is 9.532 x 10⁻¹⁷ N
When a red giant star begins to burn helium, it
the outer shell of the star are blown off with big clouds of gas and dust which is know as a nebula
Betelgeuse - the right shoulder star of Orion - is a red giant star. Its radiation peaks in the infrared at λ = 800 nm. What is the surface temperature of the star?
Answer:
3622.5 K
Explanation:
The radiation of red giant star is 800nm.
We need to find the surface temperature of the star. Let it is T.
Using Wein's displacement law to find it as follows :
[tex]\lambda=\dfrac{C}{T}[/tex]
C is constant an T is temperature
[tex]T=\dfrac{C}{\lambda}\\\\T=\dfrac{2.898\times 10^{-3}}{800\times 10^{-9}}\\\\ T=3622.5\ K[/tex]
So, the surface temperature of the star is 3622.5 K.
3. A car travels at 30mph for 2hours and then 40mph
for 3hours in the same direction. What is the average
speed of the vehicle's entire trip?
Answer:
1. 60/90
2.67/63
Explanation:
Categorize each quantity as being either a vector or a scalar. Explain your reasoning. a. 20 degrees Celsius b. 256 bytes c. 4000 Calories
Answer:
a. Scalar quantity
b. Scalar quantity
c. Scalar quantity
Explanation:
Generally, all physical quantities can be categorized into vector or scalar. Vector quantities can be described by both magnitude and direction, while scalar quantities can be described only by magnitude.
a. 20 degrees Celsius is a measure of a definite value of temperature, thus it is a scalar quantity. As temperature has no direction.
b. 256 byte is the storage capacity of an electronic device. It is a scalar quantity since it is described only by magnitude and no direction.
c. 4000 Calories is an amount of energy in a given substance. Thus, it is a scalar quantity.
