Answer:
200 J
Explanation:
Work = Force × Distance
Work = (20 N)(10 m) = 200 N·m = 200 J
200 joules of work are done by a force of 20 N over a distance of 10 m.
If an object is moving with a velocity of 24 m/s and has an acceleration of -4m/s2,
how long will it take it to stop?
A.-6s
B.6s
C.-96 s
D.20s
Answer:a
Explanation:
Using a scale of 1 cm to represent 10 N , find the size and direction of the resultant of forces of 30 N and 40 N acting at right angles to each other.
Answer:
Hence, option (A) is correct answer.
Explanation:
Suppose you have a car with a battery that applies 12.5 V to the starter.
What is the effective resistance of a car’s starter when 125 A flows through it in Ω?
Answer:
R = 0.1 ohms
Explanation:
It is given that,
Voltage of the battery, V = 12.5 V
Current flowing in the car's starter, I = 125 A
We need to find the effective resistance of a car's starter. It can be calculated using Ohm's law. Let R is the resistance.
[tex]V=IR\\\\R=\dfrac{V}{I}\\\\R=\dfrac{12.5}{125}\\\\R=0.1\ \Omega[/tex]
So, the resistance of the car's starter is 0.1 ohms.
Akhtar, Kiran and Rahul were riding in a motorocar that was moving with a high velocity on
an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar
and Kiran started pondering over the situation. Kiran suggested that the insect suffered a
greater change in momentum as compared to the change in momentum of the motorcar(because the change in the velocity of the insect was much more than that of the motorcar).
Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger
force on the insect. And as a result the insect died. Rahul while putting an entirely new
explanation said that both the motorcar and the insect experienced the same force and a
change in their momentum. Comment on these suggestions.
Answer:
According to the law of conservation of momentum:
Momentum of the car and insect system before collision = Momentum of the car and insect
system after collision
Hence, the change in momentum of the car and insect system is zero.
The insect gets stuck on the windscreen. This means that the direction of the insect is
reversed. As a result, the velocity of the insect changes to a great amount. On the other hand,
the car continues moving with a constant velocity. Hence, Kiran’s suggestion that the insect
suffers a greater change in momentum as compared to the car is correct. The momentum of
the insect after collision becomes very high because the car is moving at a high speed.
Therefore, the momentum gained by the insect is equal to the momentum lost by the car.
Akhtar made a correct conclusion because the mass of the car is very large as compared to
the mass of the insect.
Rahul gave a correct explanation as both the car and the insect experienced equal forces
caused by the Newton’s action-reaction law. But, he made an incorrect statement as the
system suffers a change in momentum because the momentum before the collision is equal to
the momentum after the collision.
A moving fan continues to move for a while even after switched off, why?
Answer:
due to the inertia of motion, the fan continues to move for some time even after switching it off.
Answer:
A fan has a property to follow it's circular motion even when the power supply is cut. A moving fan continues to move for a while even after switched off.
HOPE IT HELPS :)
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which statement BEST compares the force of gravity on a school bus on a school day and a weekend?
Answer:
The force of gravity between the Earth and the school bus is more on a school day than on a weekend
Explanation:
The force of gravity, F, is the attractive force that holds objects in place on the Earth's surface
The force of gravity attracting the bus of mass m to the Earth of mass M having a radius of [tex]R_{Earth}[/tex], can be presented by the following equation;
[tex]F = \dfrac{G \times M \times m}{(R_{Earth})^2}[/tex]
Which shows that the force increases as the mass of the bus increases
Since the school bus mass on a school day when carrying Pupils is mare than the mass of the bus in the weekend when the bus is empty, the force of gravity between the Earth and the school bus is more on a school day than on a weekend.
Which statement represents how light travels? Light given off from a moving source will travel faster in a vacuum. Light given off from a moving source will travel faster in air. Light travels slower if the light source is moving. Light travels at the same speed even if the light source is moving.
Answer:
the first one
Explanation:
Answer:
Light travels at the same speed even if the light source is moving.
Explanation:
I took the test, hope this helps :)
an aircraft acceleration from 100m/s to 300m/s in 100 s what is acceleration
Answer:
[tex](300 - 100) \div 100 [/tex]
Which of these os true? (A)light travels in a straight line.(B)light travels in a random manner. (C) parallel beams are divergent in nature.(D)parallel beams are convergent in nature.(E)non of the above
Answer:
light travels in a straight line
Explanation:
the others are wrong
Molecules are groups of atoms connected together. Which substances in the simulation have particles that are
molecules?
Answer:
The particles in oxygen and water are made up of more than one atom, so they have particles that are molecules.
Explanation:
Use the drop-down menu to complete the statement. Based on the data in the line graph, you can predict there will likely be visitors in December compared to October.
Answer:
Fewer
Explanation
Just did it on edge
Based on the data provided in the line graph, one can predict there will likely be less or fewer visitors in December compared to October.
What is line graph?The graph between two physical quantities in which the curve is a straight line. The line may be going upwards or downwards.
The slope is defined as the ratio of change in quantity on y axis and the change in quantity on x axis.
Slope is represented as
m = Δy / Δx
Given is graph(attached below) between the number of visitors and months. The graph is having positive slope till August and then after that slope is negative till December.
Positive slope means the change in quantity on y axis is increasing and negative slope is change in quantity on y axis is decreasing
When the number of visitors are compared, December month has less visitors than in the October month.
Thus, Based on the data provided in the line graph, one can predict there will likely be less or fewer visitors in December compared to October.
Learn more about line graph
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7. Convert 746 days to centuries.
Answer: 0.0208 Centuries
Explanation:
There is 2.739*10^-5 centuries per 1 day.
We can take 746 days and multiply it by that 2.7 number to get how many centuries are in 746 days.
[tex]746 *(2.793*10^{-5})[/tex] = 0.0208 centuries
need this asap will mark brainliest
Answer:
0.203 kN
Explanation:
203 N *(1 kN/1000N) = 0.203 kN
The purpose of striking the ball in a volleyball game is to: 1. Place the ball in motion 2. Change the direction of the ball's motion 3. Slow the ball's motion 4. All of the above
Answer:
4. All of the above
Explanation:
The purpose of striking the ball in a volleyball game:
From the serve you could state that you need to place the ball in motion.
When returning a shot of, you normally want to change the direction of the ball's motion.
During a dropshot, you purposely want to slow down the ball's motion.
The correct answer must be all of the above.
In a parallel circuit with a 4 ohm and a 2 ohm resistor and a 12 volt source, what is the potential difference across the 4 ohm resistor?
Answer:
12volts
Explanation:
The potential difference between 4ohm resistor is 12volts because equal voltage is dropped in both resistor.
The picture clearly shows that the 4Ω resistor is connected directly to both terminals of the battery. If you connect a voltmeter to the ends of the resistor, the voltmeter is connected directly to the battery terminals. So the potential difference across the 4Ω resistor IS the potential difference across the battery . . . 12 volts.
As long as the battery is fresh enough to supply all the current that both resistors want, the 4Ω resistor doesn't even know that the 2Ω resistor is there. (And the feeling is mutual.)
Give two examples of spatial interference which can be easily observed.
A car moving at a speed of 20 m/s then accelerates uniformly at 1.8 m/s^2 until it reaches a speed of 25 m/s. What distance does it travel during the time it is accelerating?
66 m
54 m
62 m
50 m
58 m
Answer:
62.5 m
Explanation:
.......................................
Anna will wear a black dress when she attends her cousin’s wedding. Which color(s) does the dress absorb?
Answer:
The answer is all colors
Explanation:
A car goes around a curve at 20. m/s. If the radius of the curve is 40 m, what is the centripetal acceleration of the car?
Answer:
The centripetal acceleration of car is 8 m/s².
Explanation:
Explain how a battery works. What are some possible materials you could use to make a battery for a circuit?
Answer:
Batteries are systems that store chemical energy and then release it as electrical energy when they are connected to a circuit. Batteries can be made from many materials, but they all share three main components: a metal anode, a metal cathode and an electrolyte between them. The electrolyte is an ionic solution that allows charge to flow through the system. When a load, such as a light bulb, is connected, an oxidation-reduction reaction occurs that releases electrons from the anode while the cathode gains electrons
Explanation:
The burning of a log releases the logs chemical_energy into other forms of energy
Answer:
When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.
Explanation:
What is the definition of density
Answer:
the degree of compactness of a substance.
Explanation:
The density, of a substance is its mass per unit volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: where ρ is the density, m is the mass, and V is the volume. Wikipedia
Answer:
The quantity of mass per unit volume of a substance
Explanation:
instruments used to measure the following quantities Mass weight length time and density of a liquid
Answer:
Mass: Beam balance
Weight: Beam balance
Length: Ruler
Time: Clock
Density of liquid: Hydrometer
The famous astronomer, Kepler, determined that the planetary orbits were: 1. ellipses 2. circles 3. epicentric 4. geocentric
Answer:
geocentric
i hope this helps!!!!
Explanation:
The distance, a , in the image represents
Answer:
the amplitude
Explanation:
the maximum distance at which the object gets displaced from its mean position is know as the amplitude. the straight indicates the mean position and 'a' is the maximum height at which the object is displaced.
In order to fly horizonatally at a steady speed, which two of the forces shown on the aeroplane must be equal.
(The forces shown on the aeroplane are air friction, weight and engine thrust)
HI Please answer LOTS OF POINTS AVAILABLE
Answer:
1. It takes more force to push the door near hinges compared to pushing the door far from the hinges.
2.The turning effect of the force is called moment.
3.moment(Nm)=force(N)*distance from pivot(m)
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Write to your government officials convincing them to invest in global warming prevention. Discuss the 6th Mass extinction event and give examples of previous extinctions.
write abt gobal warmingExplanation:
A car moving along a straight level road has an initial speed of 3 m s-1 and its acceleration is 2 m s-2? What
is the speed of the car after 5 s?
Answer:
13 ms-1
Explanation:
Answer:
SE RESUELVE CON LA ECUACIÓN DE GALILEO GALILEI
Explanation:
v = 3 m/s + [tex]2 m/s^{2}[/tex](5 s) = 13 m/s
An object rotates describing a horizontal circumference when subjected to a centripetal force F. What centripetal force will act on the object
if the radius of the circle is doubled and the kinetic energy of the object is halved?
A) F/4
B) F/2
C) F
D) 4F
please explain this to me :(
Answer:
Centripetal Force Requirement
The Forbidden F-Word
Mathematics of Circular Motion
As mentioned earlier in this lesson, an object moving in a circle is experiencing an acceleration. Even if moving around the perimeter of the circle with a constant speed, there is still a change in velocity and subsequently an acceleration. This acceleration is directed towards the center of the circle. And in accord with Newton's second law of motion, an object which experiences an acceleration must also be experiencing a net force. The direction of the net force is in the same direction as the acceleration. So for an object moving in a circle, there must be an inward force acting upon it in order to cause its inward acceleration. This is sometimes referred to as the centripetal force requirement. The word centripetal (not to be confused with the F-word centrifugal) means center seeking. For object's moving in circular motion, there is a net force acting towards the center which causes the object to seek the center.
To understand the importance of a centripetal force, it is important to have a sturdy understanding of the Newton's first law of motion - the law of inertia. The law of inertia states that ...
... objects in motion tend to stay in motion with the same speed and the same direction unless acted upon by an unbalanced force.
According to Newton's first law of motion, it is the natural tendency of all moving objects to continue in motion in the same direction that they are moving ... unless some form of unbalanced force acts upon the object to deviate its motion from its straight-line path. Moving objects will tend to naturally travel in straight lines; an unbalanced force is only required to cause it to turn. Thus, the presence of an unbalanced force is required for objects to move in circles.
Explanation: