Answer:
(1)Work done by snail is 382.5 N
(2)Work done by ELEPHANT is 25160 N
(3)Work done by HANS is 2420 N
(4)Work done on block is 433 N
Explanation:
The work done due to force F applied at an angle θ from the horizontal to the body is give by
Work done = Fscosθ where, s is distance traveled by body
Case 1: F= 255N , s= 3.00m and θ = 60.[tex]0^0[/tex]
Work done = Fscosθ = 255 x 3.00 x cos60.[tex]0^0[/tex] = 382.5N
thus work done by snail is 382.5 N
Case 2: F= 200N , s= 150m and θ = 33.[tex]0^0[/tex]
Work done = Fscosθ = 200 x 150 x cos33.[tex]0^0[/tex] = 25160N
thus work done by elephant is 25160 N
Case 3: F= 22.9N , s= 129m and θ = 35.[tex]0^0[/tex]
Work done = Fscosθ = 22.9 x 129 x cos35.[tex]0^0[/tex] = 2420N
thus work done by Hans is 2420 N
Case 4: F= 100N , s= 5m and θ = 30.[tex]0^0[/tex]
Work done = Fscosθ = 100 x 5.00 x cos30.[tex]0^0[/tex] = 433N
thus work done on block is 433 N
(1) The work done by the sailor is 382.5 J.
(2) The work done by elephant is 25160 J.
(3) The work done by Hans upon the backpack is 2420 J.
(4) The required work done on block is 433 J.
Let us solve these questions in parts. All these questions are based on the work done. The work done due to force F applied at an angle θ from the horizontal to the body is give by,
[tex]W =F \times s \times cos \theta[/tex]
Here, s is the distance covered by the body.
(1)
Given data:
F= 255N , s= 3.00m and θ = 60.
The work done is calculated as,
W = Fscosθ
W= 255 x 3.00 x cos60 = 382.5 J.
Thus, the work done by the sailor is 382.5 J.
(2)
Given data:
F= 200N , s= 150m and θ = 33.
The work done by the elephant is calculated as,
W = Fscosθ
W= 200 x 150 x cos33. = 25160 J
Thus, the work done by elephant is 25160 J.
(3)
Given data:
F= 22.9N , s= 129m and θ = 35.
Then the work done upon the backpack is calculated as,
W= Fscosθ
W= 22.9 x 129 x cos35. = 2420 J
Thus, the work done by Hans upon the backpack is 2420 J.
(4)
Given data:
F= 100N , s= 5m and θ = 30.
The work done is calculated as,
W = Fscosθ
W= 100 x 5.00 x cos30. = 433 J
Thus, the required work done on block is 433 J.
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*A car is going over the top of a hill whose curvature approximates a circle of radius 350m. At what velocity will the occupants of the car appear to weigh 10% less than their normal weight
Answer:
v= 18.5 m/s
Explanation:
When at the top of the hill, the only force that keeps the car in the circular trajectory, is the centripetal force. This force is not a new force, is just the net force aiming to the center of the circle. In this case, is just the difference between the normal force (always perpendicular to the surface, pointing upward) and the force that gravity exerts on the car (which is known as the weight), pointing downward. So, we can write the following expression:[tex]F_{cent} = F_{g} - F_{n} (1)[/tex]
It can be showed that the centripetal force is related to the speed by the following expression:[tex]F_{cent} = m*\frac{v^{2}}{r} (2)[/tex]
The normal force, it is called the apparent weight, because it would be the weight as measured by a scale. Replacing (2) in (1), and solving for Fn, we get:[tex]F_{n} = F_{g} - m*\frac{v^{2}}{r} (3)[/tex]
Now, we need to find the value of v that makes Fn, exactly 10% less than the normal weight (m*g), so we can write the following equation:[tex]0.9*F_{g} = F_{g} - m*\frac{v^{2}}{r} (4)[/tex]
Replacing Fg by its value, simplifying, and solving for v, we get:[tex]v =\sqrt{0.1*g*r} =\sqrt{0.1*9.8m/s2*350m} = 18.5 m/s (5)[/tex]The velocity the occupants of the car appear to weigh 10% less than their normal weight is 18.52 m/s.
The given parameters:
Radius of the curvature, r = 350 mApply the principle of conservation of energy to determine the velocity the occupants of the car appear to weigh 10% less than their normal weight;
[tex]F_c = mg\\\\\frac{mv^2}{r} = mg\\\\v^2 = gr\\\\v = \sqrt{gr} \\\\v = \sqrt{0.1 \times 9.8 \times 350}\\\\v = 18.52 \ m/s[/tex]
Thus, the velocity the occupants of the car appear to weigh 10% less than their normal weight is 18.52 m/s.
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How many electrons does Gold have?
Answer:
79 I believe! don't mind the rest sjjdjdiwowjekwhfjdoaoqhenfixiwnsodjd djdjsiwuwieodjskrkf
*please answer asap, thank u*
Light gets dimmer as you get farther away from a source according to the inverse square law (like in the previous question). Why do you think it is so challenging for astronomers to view stars and galaxies that are millions or billions of light years away from Earth?
astronomers have a difficult time viewing stars and galaxies millions or billions of light years away because they're just so far away. based on the number of light years they are away, that number represents how long the light from that object took, in order to reach that astronomers eyes. so in reality, they're looking at the past when studying objects that insanely far away. if a star is 1 million light years away, that means the light from that star will take 1 million years to reach your position. so considering the distance that an object is in space and relative to an astronomers position, it's quite expected for it to become harder to view. the farther an object is from sight, the harder it is to see.
i hope this helps!
Temperature is a measure of the average _________________ of each particle within an object.
A) kinetic energy
B) potential energy
C) heat
400JA container with a mass of 5 kg is lifted to a height of 8 m. How much work is done
by the gravitational force?
O 50J
0400)
0-400J
o
zero
O -50)
Answer:
400 J
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 5 kg
Height (h) = 8 m
Workdone (Wd) =?
Workdone by gravitational force is given by the following equation:
Wd = mgh
Where:
Wd => is the Workdone.
m => is the mass of object
g => is the acceleration due to gravity
h => is the height to which the object is located.
With the above formula, we can obtain the workdone as follow:
Mass (m) = 5 kg
Height (h) = 8 m
Acceleration due to gravity (g) = 10 m/s²
Workdone (Wd) =?
Wd = mgh
Wd = 5 × 10 × 8
Wd = 400 J
Thus, the workdone by gravitational force is 400 J
A LOT OF POINTS!! Best answer gets brainliest!
1) Which two of the following factors affect the momentum of an object: speed, velocity, mass, shape?
2) Can a small object can have a large momentum? Give an example.
3) How could you change the momentum of an object? What would you need to change?
4) A 5000kg truck and a 50 kg person have the same momentum. How is this possible?
What is 50 degrees f in kelvin
Answer:
283.15
Explanation:
looked it up
there's a handy calculator
Answer: C.
283 K
Explanation: edmentum
4.
What is the role of a compressor in an air conditioner?
O It exchanges warm air for cold air and blows it into the room.
O It increases the pressure and temperature of the refrigerant.
O It absorbs heat from the room and blows it outside.
Answer:
b
Explanation:
it compresses hot air turning into cool air almost like a reverse tornado
Answer:
It increases the pressure and temperature of the refrigerant.
Explanation:
The purpose of the compressor is to circulate the refrigerant in the system under pressure, this concentrates the heat it contains. At the compressor, the low pressure gas is changed to high pressure gas.
Different structures give compounds different properties
A worker for a moving company is pushing on a refrigerate with a force of 1500 Newtons but the refrigerator just won’t move. How much work did the worker do on the refrigerator?
Answer:
0 J
Explanation:
Work is the product of force applied and the distance moved by the object.
In this case, the force applied on the refrigerator is 1500 N
The refrigerator did not move, thus no distance , hence distance is zero
The formula for work done:
W = F*d
W= 1500 * 0
W= 0 J
If a change in speed “Δv” occurs and the mass starts at rest, would the change in speed also equal the final speed of the mass?
Yes, if the mass starts at rest, the change in speed will be equal the final speed, because:
Δv = Vf - Vo
How Vo (Initial velocity) is equal zero, we simplificate:
Δv = Vf
Then, the change of the speed, if the mass starts at rest, will be equal to final velocity.
Greetings.
do waves change direction when they travel from one material to another.
what is the average gravitational force of attraction between the earth and the sun? the earth averages a distance of about 150 million km. the earth has a mass of 5.97x10^24 kg, and the sun has a mass of about 2x10^30 kg.
Answer:
B
Explanation:
Hhhhh
Three are used to power a portable electronic device
identical batteries with E = 2.5 V each and negligible internal resistances,
connected in series. If inadvertently one of the batteries was
mounted with reverse polarity, what is the value of the supplied voltage
system?
Explanation:
Here two internal resistances are in parallel so equivalent internal resistance r
eq
=1∣∣1=
1+1
1×1
=1/2=0.5Ω
According to maximum power theorem the power will be max when internal resistance is equal to external resistance. since, r
eq
=R=0.5Ω
Maximum current through R is I
max
=
r
eq
+R
V
=
0.5+0.5
2
=2A
Maximum power is P
max
=I
max
2
R=2
2
×0.5=2W
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When long chains of carbon and hydrogen atoms break apart into smaller
chains, the temperature decreases. Which type of reaction is this?
A. Combustion
B. Endothermic
C. Replacement
D. Exothermic
Answer:
Endothermic
Explanation:
A hockey puck moves 22 meters northward, then 16 meters southward, and finally 4 meters northward.
For this motion, what is the distance moved?
What is the magnitude and direction of the displacement?
Answer:
Distance moved = 42 meters
Mag and Dir = 10 meters northward
Explanation:
Distance is total distance traveled which = 22+16+4 = 42 meters
Displacement is the amount of distance moved from the start point to the end point straight line so our equation for the magnitude is 22-16+4 = 10 meters. Then the direction is northward from the start point. This answer would also be a vector because it has a magnitude and direction.
In part C of the lab, when two wires are in series, so that current flows in opposite directions inside them, we see that the wires move ____.
a. towards each other (they attract)
b. away from each other (they repel)
c. both the wires move downwards towards the floor
d. both the wires move upwards towards the ceiling
Answer:
The correct option is B.
away from each other (they repel)
Explanation:
This because when current flows in opposite direction in wire, the electrons in them are at high density or electrons in the wires will be at high density which is as a result of contraction of the length due to relativistic of the length, this make the wires to move away from each other or repel.
Which statements correctly describe matter? Select all that apply.
A. Matter is made up of atoms.
B. Matter is a measure of the amount of material in
an object.
C. Matter may exist as a solid, liquid, or gas.
D. Matter forms when particles chemically bond
together.
E. Matter includes both elements and compounds.
Answer:
D
I hope these is correct
A matter may exist as a solid, liquid, or gas. Matter is made up of atoms. The correct options are A and C.
What is a matter?In physical laws and general chemistry, matter is any material that has mass and occupies space by having volume.
It has something to do with weight. Atoms, which are made up of subatomic particles, make up the vast majority of matter in the universe.
Even all organisms is made up of matter, whether they are living or non living.
Matter is significant as though it build up all the things present in person's environment. Matter can neither be generated or be destroyed as it can only be transmuted into some another form.
The quantity of matter in a physical existence is renowned as mass. When a net force is exerted, it also characterize the body's inertia, or resistance to acceleration.
A substance can exist as a solid, liquid, or gas. Atoms are the building blocks of matter.
Thus, the correct options are A and C.
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Newton's third law of motion states that if one object exerts a force on another object
O the forces on both objects will always be balanced
O both objects will accelerate in opposite directions
O the forces on both objects will always cancel out
O the second object exerts an equal but opposite force
Answer:
the bottom one
Explanation:
Answer:
the second object exerts an equal but opposite force
Explanation:
its right
Can someone please help, ty!!
(Will mark brainliest)
Paul is pushing the wheelbarrow in his garden to the east. His friend John comes along and starts pushing it in the opposite direction, to the west, with a force that's twice as great as Paul's. What can you say about the motion of the wheelbarrow?
A. It will move faster than before, to the east.
B. It will move in the direction of johns push, to the west.
C. It will move with the same speed and in the same direction as before, to the east.
D. It will stop moving immediately.
Answer:
The answer is B
Explanation:
It will move in the direction of johns push, to the west
Answer:
It will move in the direction of John's push, to the west.
Explanation:
Plato/Edmentum
How are Christian beliefs different than those who believe in reincarnation?
Answer:
While different religious groups like Hinduism, Sikhism, Jainism, and Buddhism belief in reincarnation and that a person has the chance to be reborn as a new person, depending on how the current life is, Christianity holds a different belief in that there is no reincarnation per se, but there is an afterlife with God for eternity in His kingdom.
Explanation:
The basic concept of reincarnation is a belief held by major religions of the world such as Hinduism, Jainism, Buddhism, and Sikhism. This philosophical belief holds that there is a rebirth or transference of an aspect of a person, be it the soul or mind or any subconscious to a different entity after one dies.
While Christianity does not specifically belief in reincarnation, it does hold the belief that the physical or bodily death of a person is not the end of that person. Rather, Christians belief in the afterlife, a life of eternity with God in His kingdom. This is not the same as reincarnation, for it involves no such rebirth as some other animal or even into a new person or being.
Thus, the Christian belief of afterlife is much different from the other religious beliefs of reincarnation.
newtonion mechanics defination
When 24500J of energy is supplied to a 2.0 kg block of aluminum.Its temperature rise from 20oc to 35oc.The block is well insulate so that there is no energy loss to the sorrounding Determine specific aluminum
Explanation:
Amount of heat supplied (Q) = 24500 J
Mass (m) = 2 kg
Initial temperature (t1) = 20 ° C
Final temperature (t2) = 35 ° C
Difference in temperature (dt) = t2 - t1 = ( 35 - 20) °C = 15 ° C
Now Specific heat capacity (S) = ?
We know we have the formula;
Q = m * s * dt
24500 = 2 * s * 15
24500 = 30 S
S = 24500 / 30
S = 816.67 J / Kg ° C
The specific heat capacity is 816.67 J/kg°C.
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The amplitude of a wave is measured from the crest of one wave to the crest of the next. Question 3 options: True False
Answer:
answer is FALSE
Explanation:
AMPLITUDE IS THE MAXIMUM AMOUNT OF DISPLACEMENT OF A PARTICLE ON THE MEDIUM FROM ITS REST POSITION
AND WAVELENGTH can be measured as crest to crest
Amplitude of a wave is the strength of the wave. It is measured from the central line of the wave to the top of the crest or bottom of the trough. Therefore, the statement is false.
What is amplitude?Amplitude is a parameter measuring the strength of a wave. It is the maximum displacement moved by the wave from its equilibrium position. The vibrational path will be twice that of the amplitude of the wave.
As the amplitude of the wave increases its intensity increases. Both are in direct proportion with the frequency and energy of a wave. For instance the amplification of sound waves increases the intensity of waves that we hear.
The distance between two consecutive crests or troughs is the wavelength of the wave not amplitude. Amplitude is measured from the axis line to the top of the crest thus, from exact middle of the wave crest to the top or to the bottom of trough. Thus, the statement is false.
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write hydrometer uses
Answer: hydrometer is an instrument used to determine specific gravity. It operates based on the Archimedes principle that a solid body displaces its own weight within a liquid in which it floats.
Explanation:
A 500 kg roller coaster moving at 15 m/s suddenly comes to a stop at the end of the ride. How much work energy was needed to stop the coaster?
Answer:
energy required=-energy lost
energy lost=change in kinetic energy
EL=1/2 mv^2
The time it takes a car to attain a speed of 30 m/s when accelerating from rest at 2 m/s2 is?
A) 2 s.B) 15 s.C) 30 s.D) 60 s.
Explanation:
u = 0m/s
v = 30m/s
a = 2m/s²
Using Kinematics, we have v = u + at.
Therefore t = (v - u) / a
= (30 - 0) / (2) = 15 seconds. (B)
Which object would be considered to be in free fall? one that experiences both friction and centripetal force. one that is truly weightless. one that is slowed down by air resistance. one with only gravity acting upon it
Answer:
D
Explanation:
Edge 2021
When just gravity is operating on an object, which is said to be in free fall.
In volleyball, why is it referred to as a free ball?The team is unable to set up the spike because the ball is at the rear of the court and has already been hit twice. Knowing this, the team receiving the ball shouts "free ball!" to signal everyone to get ready to start their offense as soon as they get possession of it.
In the hood, what does "play ball" mean?informal idiom to consent to assisting or collaborating with someone as indicated by them: His family wanted him cared for at residence, but the insurance provider was uncooperative.
To learn more about: Free ball
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Determine the momentum of a 15,000 kg truck traveling at 15 m/s
Answer:
mass*velocity=1.5*10^4 * 15
= 22.5*10^4