Answer:
According to the law of conservation of energy, energy cannot be created or destroyed, although it can be changed from one form to another. KE + PE = constant. A simple example involves a stationary car at the top of a hill. As the car coasts down the hill, it moves faster and so it’s kinetic energy increases and it’s potential energy decreases. On the way back up the hill, the car converts kinetic energy to potential energy. In the absence of friction, the car should end up at the same height as it started.
This law had to be combined with the law of conservation of mass when it was determined that mass can be inter-converted with energy.
One can also imagine the energy transformation in a pendulum. When the ball is at the top of its swing, all of the pendulum’s energy is potential energy. When the ball is at the bottom of its swing, all of the pendulum’s energy is kinetic energy. The total energy of the ball stays the same but is continuously exchanged between kinetic and potential forms
help i hope this actually works
Answer:
it does tbh.
Explanation:
Two ice skaters are at rest and facing each other. In order to move, they push
off each other. What is known about their final total momentum?
A. One skater must remain at rest.
B. Nothing is known about the final total momentum.
C. The final total momentum must equal zero.
D. Since they are on ice, this will not work. Neither can move.
Answer:
A
Explanation:
Hopefully this helps
Two ice skaters are at rest and facing each other. In order to move, they push off each other, then their net final total momentum must equal zero, therefore the correct answer is option C.
What is momentum?
It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
As given in the problem statement two ice skaters are at rest and facing each other. In order to move, they push off each other,
By using the conservation of the momentum,
The initial total momentum of two skaters = the final total momentum of the skaters
Since, initially, they are at rest and their initial total momentum is zero therefore the correct answer is option B
To learn more about momentum from here, refer to the link;
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Which is the correct equation for the force applied by a spring?
Answer:
B. [tex]F = -k*x[/tex]
Explanation:
The force of a spring can be easily calculated using Hooke's law which tells us that the force applied on a spring is equal to the product of the constant of a spring by the compressed or stretched distance of the spring.
That is:
[tex]F = k*x[/tex]
k = spring constant [N/m]
x = distance [m]
A block weighing 0.4 N is used to balance the bar.
Calculate how far from the pivot the block needs to be placed to balance the bar.
Show your working.
Answer:
0.25N
Explanation:
MOMENT OF FORCE= Force INTO perpendicular distance
=0.5m into 0.2N=0.1Nm
Then Distance = M divided by force
0.1 divided by 0.4= 0.25N
The acceleration due to gravity on the earths surface is?
Acceleration due to gravity depends directly on the mass of Earth and inversely to the square of radius of Earth.
Answer:
9.8 m/s2
Explanation:
Acceleration due to gravity is the acceleration gained by an object due to the gravitational force. Its SI unit is m/s 2. It has both magnitude and direction, hence, it’s a vector quantity. Acceleration due to gravity is represented by g. The standard value of g on the surface of the earth at sea level is 9.8 m/s2.
If the velocity of a car is 44 m/s west, how far can it travel in 0.80 hours?
Answer:
try typing this into brainly. i just took my phyics exam and i think that was one i found
Wish me Luck ! ! !
Im about to take my Fall 2020 Semester Physics Exam!
Answer:
Good Luck :)
Have a great day:)
An object is thrown straight up into the air with an initial speed of 8 m/s, and reaches a greatest height of 15 m before it falls back to the ground. a. What height is the object thrown from? b. How long does it take for the object to hit the ground?
Answer:
The value is [tex]T_t = 2.5659 \ s[/tex]
Explanation:
From the we are told that
The initial speed of the object is [tex]u = 8 \ m/s[/tex]
The greatest height it reached is [tex]h = 15 \ m[/tex]
Generally from kinematic equation we have that
[tex]v^2 = u^2 + 2gH[/tex]
At maximum height v = 0 m/s
So
[tex]0^2 = 8^2 + 2 * - 9.8 * H[/tex]
=> [tex]H = 3.27 \ m[/tex]
Here H is the height from the initial height to the maximum height
So the initial height is mathematically represented as
[tex]s = h - H[/tex]
=> [tex]s = 15 - 3.27[/tex]
=> [tex]s = 11.73 \ m[/tex]
Generally the time taken for the object to reach maximum height is mathematically evaluated using kinematic equation as follows
[tex]v = u + (-g) t[/tex]
At maximum height v = 0 m/s
[tex]0 = 8 - 9.8t[/tex]
=> [tex]t = 0.8163 \ s[/tex]
Generally the time taken for the object to move from the maximum height to the ground is mathematically using kinematic equation as follows
[tex]h = ut_1 + \frac{1}{2} gt_1^2[/tex]
Here the initial velocity is 0 m/s given that its the velocity at maximum height
Also g is positive because we are moving in the direction of gravity
So
[tex]15 = 0* t + 4.9 t^2[/tex]
=> [tex]t_1 = 1.7496[/tex]
Generally the total time taken is mathematically represented as
[tex]T_t = t + t_1[/tex]
=> [tex]T_t = 0.8163 + 1.7496[/tex]
=> [tex]T_t = 2.5659 \ s[/tex]
A sledge is pulled in a straight line by dogs, as shown. The dogs produce a total horizontal driving force of 600 N. The frictional force between the sledge and the surface is 150 N and the air resistance on the sledge is 450 N. What is the resultant force acting on the sledge
Answer:
F = 0 N
Explanation:
The direction of air resistance and frictional force will be same and opposite to the direction of the driving fore of dogs. Therefore, the resultant force can be given as follows:
[tex]resultant\ Force = F = Driving\ Force\ of\ Dogs - Frictional\ Force - Air\ Resistive\ Force[/tex]here,
driving force of dogs = 600 N
Frictional Force = 150 N
Resultant Force = 450 N
Therefore,
[tex]F = 600\ N - 150\ N- 450\ N[/tex]
F = 0 N
how many cups are in 4 gallons
Answer:
there are 64 cups
Explanation:
remember this: two cups in a pint, two pints in a quart, two pints in a quart, four quarts in a gallonl2
water starts to freeze from top whereas wax starts to freeze from bottom?why?
Answer:
im pretty sure its because wax has i higher melting point therefore it would cool quicker if the temperature dropped more. water has a lower melting point so it takes longer to freeze i think. i hope this helps
Water and wax freeze from different directions due to the unique properties and behaviors of these substances.
Water:
When water freezes, it undergoes a phase transition from a liquid to a solid state.
Unlike most substances, water exhibits an unusual property known as the "anomalous expansion of water" or "density anomaly." This anomaly is caused by the hydrogen bonding between water molecules.
As the water cools down, its molecules begin to slow down and move closer together. This causes the density of the water to increase. However, as the water reaches around 4 degrees Celsius (39 degrees Fahrenheit), it starts to behave differently.
The hydrogen bonds between water molecules become more organized and stable, causing the water to expand and become less dense.
Wax:
Wax, on the other hand, does not exhibit the same density anomaly as water. When wax undergoes solidification, it follows a different pattern due to its molecular structure and the way its particles arrange themselves.
Wax typically consists of long, nonpolar hydrocarbon chains. As it cools, the wax molecules start to lose kinetic energy, slowing down their movement.
The intermolecular forces between the wax molecules become stronger, causing them to come closer together.
In summary, water freezes from the top due to its density anomaly, with the less dense, expanded water rising and forming a layer of ice on the surface.
Wax, however, freezes from the bottom as its molecules arrange and bond together, gradually solidifying upwards. These differences in freezing behavior are influenced by the distinct properties and molecular structures of water and wax.
Know more about hydrogen bonds:
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Which of these games was a racing game?
A.
Centipede
B.
Pole Position
C.
Xevious
D.
Galaxian
E.
Space Invaders
Answer:
B.
pole position
A bicyclist with a mass of 50 kg is traveling at a rate of 30 m/s. It accelerates to a rate of 50 m/s in 5 seconds. What is the net force acting on the bicycle? *
Answer:
F=m*(v^2/r)
F=82*(8^2/30)
F=174.9N
Explanation:
brainlest pls
A student wearing a frictionless roller skates on a horizontal is pushed by a friend with a constant force of 55N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 362 J
Answer:
6.58m
Explanation:
The kinetic energy = Workdone on the roller
Workdone = Force * distance
Given
KE = Workdone = 362J
Force = 55N
Required
Distance
Substitute into the formula;
Workdone = Force * distance
362 = 55d
d = 362/55
d = 6.58m
Hence the student must push at a distance of 6.58m
A 10 N force and an 18 N force act in the same direction on an object. What is the net force on the object?
Answer:
28 N
Explanation:
From the question given above, we were told that 10 N force and 18 N force act in the same direction on the object.
The net force acting on the object can be obtained by simply adding both forces together since they both act on the object in the same direction. This is illustrated below:
Force 1 (F₁) = 10 N
Force 2 (F₂) = 18 N
Net force (Fₙ) =?
Fₙ = F₁ + F₂ (since they both act in the same direction)
Fₙ = 10 + 18
Fₙ = 28 N
Therefore, the net force acting on the object is 28 N.
Chapter 5 Review Questions
How would you calculate the spring constant of an unknown spring?
A. graph the force vs. extension of the spring and find the slope
B. Use Hooke's law to calculate the spring constant knowing one force of the spring and one deformation of the spring
C. graph the force vs. extension of the spring and find the inverse of the slope
D. conduct a series of experiments with different amounts of deformation on the spring and calculate spring constant with Hooke's Law
Which of these is an example of electrical energy being converted to mechanical energy?
Group of answer choices
Sunlight used by plants in photosynthesis
Ceiling fan
Lightning striking the ground
Answer:
Ceiling fan
Explanation:
A ceiling fan is an example of electrical energy being converted to mechanical energy.
The blades of the fan are driven by motor within the system.
Energy in a system is converted from one form to the other. Energy is neither created nor destroyed as we know from the law of conservation of energy. In this regard, the electrical energy from the outlet powers the motor. As the motor inside the fan spins, the blade in turn begins to rotate. The motion of the blade is the expression of mechanical energy.CAN SOMEONE HELP ME WITH THIS QUESTION!!
Answer:
The one you have selected
Explanation:
That is right
What role do electromagnets play in making a motor spin?
Answer:
I'm going to try to explain it to you easy as possible so basically when a motor is placed between two poles of another magnet a current from a voltage flow to the coil and a magnet field is produced around the electromagnetic and the poles of the magnet interact with the poles from the electricmatic causing the motor to turn in more coils growing stronger into the motor
As the distance between two charged particles increases, the force of attraction __________(increases/decreases). This is a(n) __________ (direct/indirect) relationship. Explain your evidence and reasoning with observations from the simulation.
Answer: decreases.
direct.
Explanation:
when you have two objects which are far apart from each other, when the distance increases the forces of attraction decreases and vice versa when the distance decreases the forces of attraction also increases.
this is a direct relationship, from careful observation and monitoring of the simulation, a pattern is noticeable by which an increase in one variable causes an opposite effect on the other variable.
During a chemical reaction the reactants are re-arranged into new substance products true or false
Answer:
True
Explanation: Magic
what is gram used to measure
A. volume
B. Mass
C. distance
D. Time
Answer:
measure what
Explanation:
?????????????
Answer:
B. Mass
Explanation:
What kind of energy is stored when you stretch a spring?
A. Kinetic energy
B. Chemical energy
C. Elastic energy
D. Gravitational potential energy
Answer:
it's B
Explanation:
Elastic potential energy is energy stored as a result of applying a force to deform an elastic objects. The energy is stored until the force is removed and the object springs back to it's original shape, doing work in the process. The deformation could involve compressing, stretching or twisting the object
Answer: Elastic energy
Explanation:
A PE X
a man walks 30 meters north,then 90 meters east, and then 30 meters south
Explanation:
D = 30+90+30
= 150m
.............
what's the question
How can humans use their knowledge of changing states of matter to better society? (ex. A human can harness the thermal energy from transitioning water from a liquid state to a gas state.)
Please Hurry This assignment is due tonight.
Write 5 sentences why. Thanks
Answer:
Anything that has mass is made up of matter – an all-encompassing word for atoms and molecules that make up our physical world. We describe this matter as existing in states (sometimes referred to as phases). Most people are familiar with three states of matter – solids, liquids and gases – but there are two more that are less commonly known but just as important – plasmas and Bose-Einstein condensates
help me help me please please, please
1) A rock was thrown horizontally from a 500.0 m high cliff. It
strikes the ground 100.0 m from the base of the cliff. At
what speed was it thrown?
Answer:
twenty two miles per hour
Help me PLEASE! 25 points!!!!! :)
Answer:
A.
Explanation:
All the arrows align to the point right
Arif decided to make a model of the global wind patterns on Earth. He draws arrows of the global winds that move in a circular pattern from the equator to the poles and back again. Explain what causes global winds to form. Why do they move in convection currents around Earth? Please help
Answer:
The Earth's rotation which produces Coriolis force is the responsing factor for the formation and movement of different global winds.
The cause of the global winds is due to the rotation of the earth that produces the Coriolis force factor for the formation and movement of global winds.
What are global wind patterns?The global wind pattern is formed by the movement of the earth and they are polar easterlies, prevailing westerlies and the trade winds.
Each of them occurs at about 30 degrees of latitude. Hence they form wind belts. The Coriolis effect that is created due to the rotation of the earth is a fact that leads to the movement of global winds.
Find out more information about the earth.
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HELP ASAP!!! How many electrons fit into each electron shell?
K
L
M
N
Answer:
k = 2
L = 8
M = 18
N = 32
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