A tow truck exerts a force of 8000 N to move a car a distance of 4 m in 20 seconds. Calculate the power of the tow truck..
1. 0.01 W
2. 100 W
3. 1600 W
Answer:
Power = 1600Watts
Explanation:
Power is given by the rate of energy expended or work done by a body (or object).
Power = [tex]\frac{Workdone}{time}[/tex]
Where;
Workdone = Force x distance
=> Power = Force x distance / time -----------------------(i)
According to the question,
Force = 8000N
distance = 4m
time = 20 s
Substitute these values into equation (i) above
=> Power = 8000 x 4 / 20
=> Power = 1600Watts
Therefore the power of the tow truck is 1600Watts
The net force acting on a 5 kg discus is 50 n. what is the acceleration of the discus
Final answer:
The acceleration of the 5 kg discus is 10 m/s², calculated using Newton's second law of motion.
Explanation:
The acceleration of the 5 kg discus can be found using Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and its acceleration (F = ma). Given the net force (50 N) and the mass of the discus (5 kg), we can rearrange the formula to solve for acceleration (a = F/m).
Now, substituting the given values into the equation, we have:
a = 50 N / 5 kg
After performing the calculation, the acceleration of the discus is:
a = 10 m/s
Which term could be used to explain why someone could safely sit on a hot wooden bench but not a hot metal bench? A. Radiation B. Specific heat capacity C. Convection D. Kelvin
The stemplot below shows the heights (in inches) of students in a class.
Answer:
B 70 inches
Explanation:
In a stem plot the numbers on the left side of the line are called the stem and the value on the right side are called the leaves. The stem represents the tens place while the leaves represent the ones place of a number.
The height of the students are as follows:
52 55 55 56 59
62 64 67 67
70 71
It can be seen that 70 inches is the height of one of the students.
Help Please..?
A 20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. What work is done in loading one barrel into the truck?
A:980J
B:19,600J
C :4900J
D :imposible to tell because velocity is not given.,
Which best illustrates the way in which radiation transfers thermal energy?
(in order from top to bottom)
A.
B.
C.
D.
The correct answer to the question is B. warm to cold.
EXPLANATION:
Before coming into any conclusion, first we have to understand radiation and conduction.
Radiation is the type of mode of transmission of thermal energy in which the radiations travels through space or vacuum without heating the intervening medium.
On the other hand, conduction is the mode of transmission of heat from one body to another body which are in contact with each other or hotter part to the colder parts of a body without any transport of material particle.
Heat always flows from a body at higher temperature to a body at a lower temperature in absence of external work done. The reverse is not possible in normal case.
Hence, the correct option will be B . It is so because heat is flowing from hot body to cold body, and there is no direct contact between the body. It explains correctly the mode of transmission of thermal energy through the process of radiations.
Radiation is the transfer of thermal energy without needing a material medium, like how the Sun's heat and light reaches the Earth through the vacuum of space.
Explanation:Radiation is the process by which thermal energy is transferred from one place to another without the need for a material medium. This is different from conduction and convection, which are other forms of heat transfer. A good example of this type of thermal energy transfer would be the energy we receive from the sun. The sun emits energy in the form of light and heat, which then travels through the vacuum of space to reach the Earth. The fact that this energy can travel through a vacuum, where there are no air molecules to conduct or convict the heat, demonstrates how radiation works. This is the best illustration of how radiation transfers thermal energy.
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A conducting copper wire has a 2.0mm diametr, a 1.5 length, and a 50 m resistance. What is the resitivity of the wire? What general information would you need to find out in order to answer the question
3. Which of the following statements about features on the sun is true?
A.) Prominences look dark in regular photographs.
B.) Solar flares form when prominences connect.
C.) The number of sunspots on the sun's surface is always the same.
D.) Sunspots can greatly increase the solar wind.
Please Help Me Out!
Although objects can go through physical and changes, the amount of matter in those objects remains the same. This is known as the Law of Conservation of Matter. Matter can be broken into smaller pieces, dissolve in liquids, change physical states, and undergo other changes while still conserving its mass. Which pairs of matter demonstrate the law of conservation? * A structure made of building blocks * The blocks of the same structure bundled in a pile with the extra binding material * A snowman * The melted remains of the same snowman * A lump of clay * The same lump broken into three pieces * 1 cup of water and one gram of salt, separated * The same cup of water with two grams of salt mixed in * A lump of clay * An identical lump added to the original * One apple * The same apple cut into slices Submit An
Answer:
A snowman
* The melted remains of the same snowman
A lump of clay
* The same lump broken into three pieces
One apple
* The same apple cut into slices
Explanation:
the saclike structure that surrounds the glomerulus is the. a. renal pelvis b. calyx c. bowman’s capsule d. cortex e. none of the above
Amy throws a softball through the air. What are the different forces acting on the ball while it’s in the air? The softball experiences force as a result of Amy’s throw. As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of . NextReset
Answer:
As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of gravity
Explanation:
When Amy throws a ball in the air then initially the force is applied by Amy to accelerate the ball in the air.
Now after throwing into the air the ball will have forces as per the FBD
Ball will have a downward force which is due to gravity and its magnitude is always remains the same
Now ball also have another force opposite to the direction of motion due to air drag.
This air drag force depends on the speed of the ball and always opposite to the velocity of the ball.
so correct answer will be
As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of gravity.
Today's Apple Mac computers run with the same internal hardware as the Windows-based PC.
(Points : 2)
True
False
I think it true
a machine does 1500 joules of work in 30 second What is the power of the machine
The power of the machine is calculated as the work done divided by the time taken, which in this case is 50 watts for a machine that does 1500 joules of work in 30 seconds.
Explanation:To calculate the power of the machine, we need to use the formula power equals work done divided by time taken. In this scenario, the machine does 1500 joules of work in 30 seconds. Using the definition of power (1 watt = 1 joule/second), we can compute the machine's power output.
Power = Work / Time
Power = 1500 joules / 30 seconds
Power = 50 watts
The power of the machine is 50 watts.
In the following figure, what is the value of the potential at points a and b?
(Figure 1)
picture a square.There is a 15 v battery on the left side, a 4ohm resistor on top, a 5v battery on the right side and a 1 ohm resistor on bottom.
I need the potential at the upper right corner, and then the potential at the lower left corner.
The potential at point a is 2V, and the potential at point b is 6V.
The circuit has two voltage sources (9V and 6V) and two resistors (2Ω and 1Ω).
To find the potential at point a (the upper right corner), we can use the voltage divider formula: V_a = (6V × 1Ω) / (1Ω + 2Ω) = 2V
To find the potential at point b (the lower left corner), we can again use the voltage divider formula: V_b = (9V × 2Ω) / (1Ω + 2Ω) = 6V
If we changed the 1Ω resistor to a different value, it would affect the voltage drop across it, and therefore the voltage at point b. For example, if the bottom resistor was 0.5Ω instead of 1Ω, the voltage at point b would be higher than 6V. also if the bottom resistor was 2Ω instead of 1Ω, the voltage at point b would be lower than 6V.
Dalton’s theory was identified using light microscope images of atoms. the experimental results of other scientists. water vapor and air experiments.
Answer:
C
Explanation:
Answer:
It is C.
Because of his theory water turns into air of a process called evaporation.
And im giving credit to the guy above his awswer
If you put a ballon in the freezer, what happens to the gas pressure in the ballon?
Talia is manufacturing rolls of wire for hanging pictures. She needs a material that is ..... so that it can easily be pulled into wire without breaking.
A) Conductive
B) Lustrous
C) Ductile
the correct answer is C. ductile.
Talia needs a ductile material for wire manufacturing, and copper is an example with high tensile strength and superior conductivity, making it suitable for electrical wiring.
Talia requires a material that is ductile for manufacturing rolls of wire for hanging pictures. Ductility is a key characteristic of certain metals that allows them to be drawn into thin wires without breaking. Copper is a prime example of a ductile material, and in addition to its ductility, copper is known for having a high tensile strength and being a very good conductor of electricity due to its low resistivity. These properties make copper an excellent choice for electrical wiring, though other materials like aluminium and gold are also used for specific applications due to their unique advantages, such as aluminium's lower weight and gold's resistance to corrosion.
During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 76.0 n/m. if the hose is stretched by 2.50 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length?
HELP PLEASE .
Which of the following is an example of transuranium element ?
Samarium
Uranium
Thorium
Curium
Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
Samarium, uranium, and thorium are all elements with atomic numbers less than 92, which is the atomic number of uranium. Curium is the first transuranium element, with an atomic number of 96. It was discovered in 1944 by Glenn T. Seaborg and his colleagues at the University of California, Berkeley.
Curium is a radioactive element that decays into other elements, such as plutonium and barium. It has a variety of applications, including in nuclear weapons and medical research.
The other elements in the question are not transuranium elements. Samarium is an lanthanide element with an atomic number of 62. Uranium is an actinide element with an atomic number of 92. Thorium is an actinide element with an atomic number of 90.
Therefore, Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
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If the man on the left pulls on the object with a force of 500 N and the man on the right pulls on the object with a force of 750 N, what is the net force exerted on the object?
A.
1250 N to the right
B.
1250 N to the left
C.
250 N to the right
D.
250 N to the left
________ occurs when the horizontal winds move air against mountain ranges, forcing air to rise as it passes over the mountains.
Which of the following materials is not a fluid
A. Air
B. Cork
C. Gasoline
D. Water
it has to be a cork, because air is gaseous, and can be liquidized due to the large quantity of oxygen that makes it up
Which best describes the forces identified by Newton’s third law of motion?
equal and acting on different objects
equal and acting on the same object
unequal and acting on different objects
unequal and acting on the same object
Best answer is A: Equal and acting on different objects
Explanation, according to the third law of motion, this is how it works.
I can also confirm that I have tested on this question and got 100% on that test, so this answer has to be correct.
The forces identified by Newton’s third law of motion is best describes equal and acting on different objects.
What is Newton’s third law of motion?If an object exerts a force on another object, then another object must exert a force of equal magnitude and opposite direction back on first object.
Example of Newton’s third law of motion are
A swimmer moves forward by pushing off the side of pool. This way, the wall pushes in opposite direction and giving acceleration.Rockets move forward by expelling gas backward at high velocity. That means, the rocket exerts a large backward force on the gas in the rocket combustion chamber, and the gas thereby exerts a large reaction force forward on the rocket. This reaction force is called thrust.Helicopters create lift by pushing the air downward, therefore facing an upward reaction force. Birds fly by exerting force on air in a direction opposite to that of whatever force they need. The wings of a bird force air down and backward in order to get lift and forward motion.To learn more about Newton’s third law of motion here
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The area around a charged object that can exert a force on other charges objects is an electric_____.
The answer is Electric force.
What is the source of all magnetism?
Gravitational waves
Sound waves
The core of the Earth
Electric current
Electric current. The source of all magnetism is electric current, both at macroscopic and microscopic levels, responsible for phenomena including Earth's magnetic field and ferromagnetism.
The source of all magnetism is electric current. This includes both macroscopic currents, such as those flowing through a wire, and microscopic currents, such as those associated with electrons orbiting an atomic nucleus or the spin of subatomic particles like protons and electrons. In the case of Earth's magnetic field, it is mostly generated by electric currents in the planet's molten outer core. In common materials, magnetism arises from the internal cooperative alignment of electron spins, a phenomenon known as ferromagnetism. The relationship between electricity and magnetism is such that separate north and south magnetic poles, or magnetic monopoles, do not exist; instead, magnetic effects are always due to the presence of electric currents forming magnetic dipoles.
Question 3 Unsaved
Which type of galaxy is the Milky Way ?
Question 3 options:
elliptical
satellite
irregular
spiral
what is the best definition of intensity
a.intensity is the frequency of a wave
b.intensity is the amount of energy a wave carries per second
c. intensity is how well a sound travels through a medium
plzzzzzz help!!!!!!!!
Answer:
B
Explanation:
A is incorrect because intensity is dependent on the amplitude not on the frequency.
B is correct because intensity is the amount of energy a wave carries per second.
C is incorrect because intensity is not how well a sound travels through a medium.
The radio source ________ is located in a place consistent with the center of our galaxy.
The difference in temperature between 100°C and 101°C is _____ the difference between 100K and 101K.
A wrench reduces the force needed to tighten a bolt. For this statement to be true, the wrench _____. A. decreases the input force and decreases the input distance B. increases the input force and decreases the input distance C. increases the input force and increases the input distance D. decreases the input force and increases the input distance
Answer:
D
Explanation:
Just looking at the physics of a wrench, it allows us to apply a turning force to an object. The reason a wrench is helpful is that it allows us to create a greater turning force, without necessarily changing the force applied to it.
Using the formula:
Fm = The moment of a force (the turning force)
F = The force applied
d = Distance from the fulcrum that the force is applied
Fm = F x d
This formula basically states that, if the moment of the force (output force) stays constant, then the force must decrease, if the distance increases.
Hence, the further away from the fulcrum that the force is applied (increase input distance), the less force needs to be applied (decrease input force).