Answer:
Approximately [tex]2.8 \times 10^{5} \; \rm J[/tex] (assuming that the car is moving on level ground, and that there is no friction to hinder the motion of the car.)
Explanation:
Formula for the kinetic energy, [tex]\rm KE[/tex], of an object of [tex]m[/tex] travelling at velocity [tex]v[/tex]:
[tex]\displaystyle \text{KE} = \frac{1}{2}\, m \cdot v^{2}[/tex].
Let [tex]v_1[/tex] and [tex]v_2[/tex] denote the velocity of this car before and after the acceleration.
Kinetic energy of this car before the acceleration:
[tex]\begin{aligned}\text{KE}_1 &= \frac{1}{2}\, m \cdot {v_1}^{2} \\ &= \frac{1}{2} \times 700\; \rm kg \times (12\; \rm m \cdot s^{-1})^{2} \\ &\approx 5.0 \times 10^{4}\; \rm J\end{aligned}[/tex].
Kinetic energy of this car after the acceleration:
[tex]\begin{aligned}\text{KE}_2 &= \frac{1}{2}\, m \cdot {v_2}^{2} \\ &= \frac{1}{2} \times 700\; \rm kg \times (30.6\; \rm m \cdot s^{-1})^{2} \\ &\approx 3.3\times 10^{6}\; \rm J\end{aligned}[/tex].
Assume that this car was travelling on level ground. Also assume that there is no friction to hinder the motion of this car. The work of the engine of this car would be equal to the amount of [tex]\rm KE[/tex] that the car has gained:
[tex]\rm KE_2 - KE_1 \approx 2.8\times 10^{5}\; \rm J[/tex].
During a testing process, a worker in a factory mounts a bicycle wheel on a stationary stand and applies a tangential resistive force of 130 N to the tire's rim. The mass of the wheel is 1.70 kg and, for the purpose of this problem, assume that all of this mass is concentrated on the outside radius of the wheel. The diameter of the wheel is 50.0 cm. A chain passes over a sprocket that has a diameter of 8.75 cm. In order for the wheel to have an angular acceleration of 3.50 rad/s2, what force, in Newtons, must be applied to the chain
Answer:
The force that must be applied to the chain in order for the chain to have the given acceleration is approximately 694.2 N
Explanation:
The given restive force, [tex]F_f[/tex] = 130 N
The mass of the wheel, m = 1.70 kg
The diameter of the wheel, D = 50.0 cm
∴ The radius of the wheel, R = 50.0 cm/2 = 25.0 cm = 0.25 m
The diameter of the sprocket over which the chain passes, d = 8.75 cm
The radius of the sprocket over which the chain passes, r = 8.75 cm/2 = 4.375 cm = 0.04375 m
The angular acceleration, α = 3.50 rad/s²
Torque, τ = I·α
Where;
I = The moment of inertia = m·R²·α
The net torque = The applied torque - The friction torque
Therefore, we get;
I × α = m × R² × α = F × r - [tex]F_f[/tex] × R
1.70 kg × (0.25 m)² × 3.50 rad/s² = F × 0.04375 m - 120 N × 0.25 m
F = (1.70 kg × (0.25 m)² × 3.50 rad/s² + 120 N × 0.25 m)/(0.04375 m) = 694.214286 N
The force that must be applied to the chain in order for the chain to have the given acceleration, F ≈ 694.2 N
what is the difference between food and money?
science help please in le photo...........
a _____ has to do with the direction of a force
Answer:
The "solid force"? ... The direction of the force always seems to be coming out of the solid surface. A direction which is perpendicular to the plane of a surface is said to be normal. The force that a solid surface exerts on anything in the normal direction is called the normal force.
Explanation:
i think i hope this helps
the soft ballplayer does 9876 joules of work when hitting a ball into center field. Assuming the ball landed 100 meters away from home plate, how much force did the player use to hit the ball?
Answer:
F = 987600 N
Explanation:
Force Equation
F=ma
Newton's second law states that force is proportional to what is required for an object of constant mass to change its velocity. This is equal to that object's mass multiplied by its acceleration. We use Newtons, kilograms, and meters per second squared as our default units, although any appropriate units for mass (grams, ounces, etc.) or velocity (miles per hour per second, millimeters per second2, etc.) could certainly be used as well - the calculation is the same regardless.
Solve
F = m * a
F = 100 kg * 9876 m/s2
F = 987600 N
Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.
Imani stirs a cup of hot sencha tea with a cool silver spoon. She notices that the silver spoon becomes warmer. What energy change occurs when the silver spoon is added to the hot cup of sencha tea?
A. The spoon adds its cold to the hot tea
B. The hot tea absorbs the heat from the spoon
C. The cool spoon causes the water to expand thus cooling it
D. The tea loses heat to the spoon causing the spoon to become warmer
Answer:
D. The tea loses heat to the spoon causing the spoon to become warmer
Explanation:
When the silver spoon at a lower temperature than the tea, is added to the tea, it makes thermal contact. Hence, the heat transfer starts between the two until the equilibrium is reached. We know that the heat transfer takes place from the body with a higher temperature to a body with a lower temperature. As a result, the body with higher temperature loses heat and its temperature lowers down. While the body with a lower temperature gains heat and its temperature rises.
Therefore, the correct option is:
D. The tea loses heat to the spoon causing the spoon to become warmer
NO LINKS PLEASE. brainly to the best answer.
Compare and contrast potential energy and kinetic energy
Answer:
Kinetic energy is energy possessed by a body by virtue of its movement. Potential energy is the energy possessed by a body by virtue of its position or state. While kinetic energy of an object is relative to the state of other objects in its environment, potential energy is completely independent of its environment.
Both energies are related to motion.
Explanation:
Gender differences in learning are due to both genetics and socialization.
t or f
Answer:
TRUE
Explanation:
THERE YOU GOOO!!!!!!!!!!!!!!
(also hi lulu)
Please help me as soon as possible.
Answer:
true
Explanation:
(a) If a force of 6 N is applied on a body of mass 4 kg, moving at a uniform
velocity, in the direction of its motion, find the resulting acceleration.
(b) If the above force is applied in the direction opposite to the direction
of motion of the body, find its deceleration.
Answer:
1.5 m/s ; - 1.5 m/s²
Explanation:
F = ma
F = Force ; m = mass of body ; a = Acceleration
Hence,
a = F/m
F = 6N applied in the direction of motion of the. Body
a = 6N / 4 kg
a = 1.5 m/s² in the direction of motion.
If the force is applied in the opposite direction of motion :
F = ma
a = F/m
a = 6 / 4
a = 1.5 m/s²
Simc efoece is applied in the opposite direction of motion :
We have a negative acceleration (deceleration) = - 1.5 m/s²
2 ways in which the effects of friction can be minimised in the experiment
Answer:
Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids.
Explanation:
hope it helps
How objects on Earth are affected by gravitational force.
Answer:
The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases. Both objects exert an equal attractive force on each other: a falling object is attracting the Earth with the same size force as the Earth is attracting it
A fisherman sees 7 wave crests go by in 10.0 s. The crests are 2.43 m apart. Find the frequency of the wave. (Unit = Hz)
Answer: 0.7
Explanation:
A fisherman sees 7 wave crests go by in 10 s, with wavelength (λ) ia 2.43 m has the frequency of the wave is 0.7 hertz.
What is a wave?A wave is defined as the propagation of distrubance from one place to another. It can carries energy when it propagates into the medium without the net movement of the particles.
It refers to the variations or flow of energy without the transfer of mass of particles or matter. The waves can be visible or invisible. Light and sound are travel in the form of waves.
In waves, the wavelength, frequency, wavespeed and time period can be identified. Frequency refers to the number of oscillations takes place per unit time. It is measured in hertz (Hz).
Wavelength(λ) defines the distance travelled by the wave in a particular time in one vibration. It is also defined as the spatial period of the wave. It can be obtained by taking ratio between wavespeed and frequency. The unit of wavelenght is meter(m).
Wavespeed of the wave equals the wavelength and frequency. It defines the distance travelled/ number of meter covered by given time. Wavespeed (v) = wavelength (λ) / frequency (f). Its unit is m/s.
Time period is inversely proportional to the frequency (f). The time taken by the wave to complete its one oscillation is called time period. Time period = 1 / f . Its unit is seconds (s).
From the given,
time = 10 secs
no of waves = 7
wavelength = 2.43 m
To obtain frequency from the givens, the formula for frequency is:
frequency = no.of.cycles of waves / time taken
= 7 / 10
f = 0.7 hertz.
Hence, the frequency of the wave is 0.7 Hz for 7 waves and given time 10 s.
Learn more about the frequency, wavelength and wavespeed :
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help meh pls- i lazy
Answer:
the first question is B, if not then its C
Explanation:
sorry if I am wrong
The lettuce is scattered all over the garden.
Travel down each path until you reach a head of lettuce, then continue to pick it while
there is still some left.
This is vety hard this is level 4 number 10 on code.org plsss help me
Answer:
Explanation:
Coding is all about logic, since I do not have the actual problem from the website I will guide you on how to solve this.
Since you need to go a certain direction you will need to indicate to the character which direction to go. Next, we need to prevent the player from travelling through a wall, we can accomplish this using an IF/ELSE statement. IF the next block in that direction is a wall then do not move forward, ELSE move forward. We would call this statement every time the player tries to move in any direction. Finally, once we reach the lettuce we need to continue picking it until there is no more. To do this we use a While loop, that checks to see if there is any more lettuce, if there is it will run the code to pick up lettuce, if there is NO more then the While loop will exit. That would be the entire code.
Please help! What's the answer to this question, A 5.6 nC electric charge is placed in an Electric Field and experiences a force of 7.4 μN. What is the magnitude of the Electric Field at that location?
Answer:
1321 N/C
Explanation:
From the question,
Electric Field (E) = Electric Force(F)/Electric Charge(q)
E = F/q............ Equation 1
Given: F = 7.4 μN = 7.4×10⁻⁶ N, q = 5.6 nC = 5.6×10⁻⁹ C
Substitute these value into equation 1
E = ( 7.4×10⁻⁶)/(5.6×10⁻⁹)
E = 1.321×10³ N/C
E = 1321 N/C
Hence the magnitude of the electric field at that location is 1321 N/C
What are two ways you can increase power by climbing the stairs?
Answer:
change the
timedistance force.Explanation:
P = W/time
W = F*d
You have control over how fast you go up the stairs.
You also have control over how far up the stairs you go.
Therefore the answer is
timedistanceIf you don't like distance as an answer, you can carry something up the stairs -- anything that increases F will do.
If the current in a wire which is placed perpendicular to a magnetic field increases the force on the wire
Answer:
The force on the wire increases
Explanation:
Since the force on the wire F = BILsinФ where B = magnetic field strength, I = current in wire, L= length of wire and Ф = angle between the magnetic field and the wire.
Given that the magnetic field and the wire are perpendicular, Ф = 90°
So, F = BILsin90° = BIL
Since B and L are constant, F ∝ I
So, if the current in the wire increases, the force on the wire also increases.
Two particles are placed near each other. Each has a charge of +2e. One particle exerts both an electric force Fe and a gravitational force Fg on the other particle.
Answer:
hi your question is incomplete below is the missing part of your question
Question : How does the direction and magnitude of Fe compare to Fg
answer : Not enough information is given
Explanation:
From the above information given in the question the direction and magnitude of FE cannot be compared to Fg and this is simply because the mass of the particle that force is been exerted on is not given therefore we cannot ascertain the magnitude of the gravitational force. Therefore we can conclude that not enough information is given
Which one is the right andwerrrrrrrr
under which conditions do both convex and concave mirrors form virtual images state whether or not each can form a real image if the mirror can form a real image describe how this occurs
Answer:
Explanation:Concave mirrors can make a real image.when the object is away from the mirror it is called real image and when the object is closer to the mirror it is called virtual mirror.
CAN U HELP PLZZ? ;(
A 12kg aluminum box is sliding along a horizontal steel surface while experiencing a rightward applied force of 60N. The box has a displacement of 20m. Is this box in Equilibrium? *
A.)Yes, because the net force & net work is more than 0N
B.)Yes, because the net force & net work equals 0N
C.)No, because the net force & net work is more than 0N
D.)No, because the net force & net work equals 0N
E.)Need more info
Derive formula of time period of S.H.M.
Answer:
it os shm and yea because of the smh
Explanation:
smh
HELP!!!
A(n) ________ effect reddens the sun at sunset and sunrise.
•Diffuse
•Reflection
•Scattering
•Opaque
You are rolling a ball in a veiled by kicking it. You get tired and stop kicking the ball. What happens to the potential energy of the ball.
Answer:
The potential energy of the ball becomes 0
Explanation:
When kicking the ball, and it moves up, the potential energy of the ball increases. When the ball descends downwards, the potential energy of the ball reduces.
This is so because potential energy increases as height increases and decreases when there is a reduction in height.
So, when you stop kicking the ball and you place the ball on the floor, the ball becomes static (motionless); hence, the potential energy becomes 0.
You are playing baseball and hit a single, running to first base. Your distance and displacement are
Answer choices:
A. Both 90 feet
B. Both 0 feet
C. Distance 90 feet Displacement 0 feet
D. Distance 0 feet Displacement 90 feet
Answer:
C. Distance 90 feet Displacement 0 feet
Suppose you are working on green house, which light you would
use for their growth?
Answer:
Fluorescent lighting is usually used.
Explanation:
Answer:
HPS lighting or LED light
Explanation:
HPS light is well known choice with a proven track record for growers. While you can also use LED lights as an alternative to incandescent or HPS fixtures for day length extension.
Put the following objects in order by their
weights with the heaviest first.
A) a glass bottle filled with air at atmo-
spheric pressure:
B) a glass bottle filled with helium at at-
mospheric pressure;
C) an empty glass bottle (vacuum inside).
?? Physics
Answer:
I Think its ABC
Explanation:
No air is the lightest
Helium is lighter than regular air that's why it goes up so then the regular air would be heaviest.
1) Calculate the ideal efficiency of a heat engine that takes in energy at 800 K and expels heat to a
reservoir at 300K ?
Answer:
Could you explain that more better?
Explanation:
Atruck with a mass of 5280 Kg has an acceleration of 45 m/s/s what is the force acting on the truck?