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
newtonion mechanics defination
How many electrons does Gold have?
Answer:
79 I believe! don't mind the rest sjjdjdiwowjekwhfjdoaoqhenfixiwnsodjd djdjsiwuwieodjskrkf
do waves change direction when they travel from one material to another.
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)
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.
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
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.
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:
Is it possible that the physical velocity is constant but the magnitude of the velocity is variable?give an example
Answer:
yes it is possible
Explanation:
if the body is travelling with uniform speed in a circular track its speed remains the same but the velocity is non-uniform as the direction of the body is changing every time.
eg: a body in uniform circular motion has constant speed but its velocity changes at every point during the course of motion. Whenever, the direction changes, velcoity changes.
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)
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.
Hope it will help :)
A naked, male corpse was found at 8AM on Tuesday, July 9.The air temperature wasalready 26.7˚C (81˚F). The body exhibited some stiffness in the face and eyelids and had a body temperature of 34.4˚C (93.9˚F). Livor mortis was not evident. Approximately how long ago did the man die? Justify your answer. Would clothing on the body have made a difference in determining the actual time of death in this case? Why or why not?
Answer:
x = 9.87 hours ago.
Further explanation is present below.
Explanation:
Data given:
Air Temperature = 26.7°C (81°F)
Body temperature = 34.4°C (93.9°F)
We are given that, Livor mortis was absent. Secondly, The body exhibited some stiffness in the face and eyelids.
So, it can be concluded that, body must have died recently, as Livor mortis was absent plus the presence of stiffness in the face and eyelids. Furthermore,
The normal body temperature = 37°C
Body temperature in our case = 34.4° C
Difference = 37 -34.4 = 2.6°C
And Air temperature = 26.7°C
Which is a very low difference, in addition, it has not acquired the air temperature so, all this evidence certifies that body died recently.
Now, we have to calculate, how recently it died.
Formula:
0.78 . x = difference of body temperature and air temperature
Where, x = number of hours = time required,
0.78 . x = (34.4 - 26.7)
0.78 . x = 7.7
x = 7.7/0.78
x = 9.87 hours ago.
It means that, naked male corpse was died 9.87 hours ago.
Now, we are asked to find out clothing on the body had made a difference or not.
So, Yes it would definitely make a difference. As body would have more warmer than being naked. and it would result in a calculation of a different time of death. (body temperature would have > 34.4°C)
4. A thermos bottle has two layers, a glass layer and a vacuum layer.
The vacuum layer is the better
o radiator
O convector
o insulator
O conductor
Explanation:
..........the answer is insulater
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.
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.
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.
*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!
= 16ou kg x 9.8/m 15 xrom
7.ů5 X 105 Ek gained = 7.05x10
5. Calculate the 'efficiency of the roller coaster if the vertical height of the rollercoaster at point B is 90.0 m, the mass of the coaster is 1600 kg and the velocity the coaster at point Fis 37.0 m/s
Answer:
efficiency can be expressed in terms of power.
If so, power=force*velocity
P= (mass×gravity)*velocity
p= 1600×9.81×37
p=580752
*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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Different structures give compounds different properties
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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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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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
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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Temperature is a measure of the average _________________ of each particle within an object.
A) kinetic energy
B) potential energy
C) heat
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
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:
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