Answer:
a) transferring energy
Explanation:
A linkage is an assembly of parts connected together to control forces and movement. The connections between links are called joints and are used for ensuring movement, pure rotation or sliding.
Linkages provides a means in which kinetic energy is being transferred in different directions within a system. This Linkages can be used to Change force direction, size of force applied or the motion created by the force.
What is the velocity of a bobsled that travels 100 meters in 8.9 seconds in m/s
Answer:
11.2 m/s
Explanation:
Average velocity = displacement / time
v = 100 m / 8.9 s
v = 11.2 m/s
A ball is thrown vertically downward with an initial speed of 12.0 m/s from a height of 10.0 m above the ground. Ignoring air resistance, what is the speed of the ball when it reaches the ground?
(A) 18.5 m/s
(B) 14.6 m/s
(C) 14.0 m/s
(D) 12.8 m/s
(E) 12.0 m/s
Can you just take a picture of your work clearly because I have to show work. Thanks.
Answer:
18.5 m/s
Explanation:
Take down to be positive.
Given:
Δy = 10.0 m
v₀ = 12.0 m/s
a = 9.8 m/s²
Find: v
v² = v₀² + 2aΔy
v² = (12.0 m/s)² + 2 (10 m/s²) (10.0 m)
v = 18.5 m/s
If 10,000 J of work was done to raise a 225 kg box, how high was the box raised?
Answer:
Explanation: Work=force×distance
W=F×S where W=10,000J, F=m×g=225 kg×10 N/kg= 2250 N
⇒S=W/F
= 10000/2250
= 4.44 m
The box will be raised 4.53 m
What is work done ?Work done is defined as the product of component of the force in the direction of the displacement and the magnitude of this displacement .
Work done = F .s = Fs cos (theta)
F = mg
s =h
theta = 0°
cos (theta) = cos 0 = 1
hence , work done = m*g*h
Potential energy is stored in the form of work done
potential energy = work done to raise the box = m*g*h
given
mass (m) = 225kg
work done(WD) = 10,000 J
height (h) = ?
potential energy = m*g*h
10,000 J= 225kg * 9.8m/s^2 * h
h = 4.53 m
The box will be raised 4.53 m
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When a shot putter exerts a force of 140 N on a 7.5 kg shot, what its is acceleration?
18.67
Explanation:
acceleration=Force÷mass
acceleration=140÷7.5
acceleration=18.67
Answer:
Explanation:
Force,F = mass,m × acceleration due to gravity,g
⇒g=F/m
⇒g=140/7.5
⇒g=18.67 N/kg
What is the momentum of a man of mass 10kg when he walks with a uniform velocity of 2m/s.
(point stealers will be reported so pls dont do it)
Answer:
[tex]Momentum(p) = 20kgm/s[/tex]
Explanation:
Given
Mass = 10kg
Velocity = 2m/s
Required
Calculate the momentum of the man
Momentum is calculated as thus
[tex]Momentum(p) = Mass(m) * Velocity(v)[/tex]
or
[tex]p = mv[/tex]
So; to solve this question; we simply substitute 10kg for mass and 2m/s for velocity in the above formula;
The formula becomes
[tex]Momentum(p) = 10kg * 2m/s[/tex]
[tex]Momentum(p) = 10 * 2 * kg * m/s[/tex]
[tex]Momentum(p) = 20kgm/s[/tex]
Hence, the momentum of the man is [tex]20kgm/s[/tex]
Two vectors which do not lie along the same line represent what kind of
motion?
A. Resultant motion
B. Scalar motion
C. One-dimensional motion
D. Two-dimensional motion
do you believe there is an end to the universe? Explain your answer
Question 1(Multiple Choice Worth 2 points)
(01.01 MC)
Once a scientist has made a hypothesis, what would they typically do next?
O Analysis
O Testing
O Research
O Sharing
Answer:
Testing
Explanation:
Scientific methods are the steps that scientists follow to find an answer to the questions and to find solutions to the problems. There are certain steps which are followed chronologically in the scientific method:
asking questionsmaking observationsforming a hypothesistesting the hypothesisanalyzing the resultsdrawing conclusioncommunicating the results
9. A weather satellite is launched from the ground and placed in orbit six times farther away from the earth's centre. The gravitational field experienced by the satellite in orbit is the field that it experienced on the ground?
a Six times
b. One sixth of
c. Thirty-six times
d. One thirty-sixth of
Answer: d
One thirty-sixth of
Explanation: Gravitational field or gravitational field strength obeys the inverse square law. The gravitational field is inversely proportional to the square of the earth distance. That is,
g = Gm/r^2
Where r = distance.
If weather satellite is placed in orbit six times farther away from the earth's centre, gravitational field will be one thirty-sixth of its initial value.
Therefore, the gravitational field experienced by the satellite in orbit is one thirty-sixth of the field that it experienced on the ground.
What is nuclear energy?
A. Stored energy due to an object's location or position
O.B. Energy carried by moving electrons
O C. Energy due to an object's motion
O D. Energy released from atoms
Answer:
the answer from nod energy from atoms
A ball is thrown upward with ten units of momentum initially. What is the “recoil” momentum of the earth? Why do we not feel this?
Answer:
1.) Momentum = 10 units
2.) Because of gravity
Explanation:
According to the Newton 3rd law of motion, we realise that in collision, momentum is always conserved.
So, if a ball is thrown upward with ten units of momentum initially, the “recoil” momentum of the earth will be approximately 10 units of momentum. We do not feel this because of the gravity.
A car of mass 1000kg is moving at a speed of 20m/s.
It's brought to rest at a distance of 50m. Calculate the net force acting on the car.
Answer:
-4000 N
Explanation:
1. First let's look at what we know.
Mass: 1000 kg
Initial velocity: 20 m/s
Final velocity: 0 m/s
Displacement: 50 m
2. Let's try and apply a Kinematics equation here.
Looking at what information we have, I would say that this is the best equation:
v[tex]f^{2}[/tex]=v[tex]o^{2}[/tex] + 2aΔx
3. Plug in the numbers.
0 = 400 + 2(a)(50)
0 = 400 + 100a
-400 = 100a
a = -4 m/s^2
4. Use ∑F=ma
∑F = (1000)(-4)
∑F = -4000 N
How does a force do negative work on an object
Answer:
Explanation:
How does a force do negative work on an object ; This is when the direction of motion is opposite to the direction of the force
To solve this we must be knowing each and every concept related to work. Therefore, a force do negative work on an object, when the direction of motion is opposite to the direction of the force.
What is work?A task requiring mentally or physically effort in order to accomplish a goal or outcome is referred to as labor in general. When we lift heavy objects off the ground or push or pull large objects, we are performing labor. When the direction of motion is opposite to the direction of the force, work is negative.
Another word we frequently use is energy. Energy and amount of work performed are typically associated, because a person who's really feeling particularly excited is capable of accomplishing a lot of work.
Therefore, a force do negative work on an object, when the direction of motion is opposite to the direction of the force.
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Variations to the forehand stroke are not allowed. True False
please i need detaailed explanation
This is a continuation of the first question.
Answer:
1Farahd
The equivalent capacitance in parallel 6F is now in series with
3F - 2F = 1F
What area specializes in the identification and examination of skeletal remains?
What does Ohm’s law state?
A. Current equal voltage time resistance
B. Voltage equals resistance divided by current
C. Voltage equals current divided by resistance
D. Voltage equals current time resistance
Answer:
The answer is D
Explanation:
All the terrestrial planets have..
A. liquid oceans
B. liquid helium
C. rocky surfaces
D. at least one moon
Question 10 of 10
2 Points
Which of the following best describes how the Federal Reserve Bank helps
banks during a bank run?
A. The Federal Reserve Bank acts as an insurance company that
pays customers if their bank fails.
B. The Federal Reserve Bank regulates exchanges to prevent the
demand for withdrawals from rising above the required reserve
ratio.
C. The Federal Reserve Bank has the power to take over a private
bank if customers demand too many withdrawals.
D. The Federal Reserve Bank can provide a short-term loan to banks
to prevent them from running out of money.
Answer:
D. The Federal Reserve Bank can provide a short-term loan to banks
to prevent them from running out of money.
Explanation:
A bank run occurs when a large number of depositors withdraw their deposits simultaneously from a bank.
As the number of withdraws increases, the available cash in the bank decreases until a point that the bank can't give depositors their money.
In these situations, The Federal Reserve Bank acts as a lender of last resort that helps to reinforce the effect of deposit insurance, and to reassure bank customers that they will not lose their money.
describe what factors can make it difficult to reintroduce captive animals into their natural habitats.
Answer:
Captive animals are animals that are maintained by people in an enclosed place not allowing them to be free. There are several factors that make it difficult to reintroduce them to their natural habitats like:
-Captive animals don't learn the necessary skills to survive in their natural habitats like hunting skills.
-They are too used to have contact with people which makes them vulnerable to hunters.
-Sometimes these animals are not able to integrate with a wild population.
-It has been found that some captive animals are more susceptible to diseases.
helpp me pleassee....
Answer:
The fundamental wavelength of the vibrating string is 1.7 m.
Explanation:
We have,
Velocity of wave on a guitar string is 344 m/s
Length of the guitar string is 85 cm or 0.85 m
It is required to find the fundamental wavelength of the vibrating string. The fundamental frequency on the string is given by :
[tex]f=\dfrac{v}{2l}\\\\f=\dfrac{344}{2\times 0.85}\\\\f=202.35\ Hz[/tex]
Now fundamental wavelength is :
[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{344}{202.35}\\\\\lambda=1.7\ m[/tex]
So, the fundamental wavelength of the vibrating string is 1.7 m.
Boats use echo sounders. Pulses of sound waves are reflected by the sea bed and
detected by a sensitive microphone. The time between an echo sounder sending and
receiving a pulse is 0.005 s. The device calculates the depth of the sea, using the speed
of sound in sea water, which is 1500 m/s.
Use this information to calculate the depth of the sea. Show your working.
Answer: depth = 3.75 m
Explanation:
Taken the speed of the sound in sea to be V = 1500 m/s
The time between an echo sounder sending and receiving a pulse is 0.005 s. That is,
Total time T = 0.005
Formula for echo is:
V = 2X/T
Where X = distance covered
Substitute V and T into the formula
1500 = 2X/0.005
Cross multiply
7.5 = 2X
Make X the subject of formula
X = 7.5/2
X = 3.75 m
Therefore, the depth of the sea is 3.75 m
Why is it a good idea to explore the health and fitness field in terms of career
options?
O A. There are career opportunities that require a variety of skills and
talents.
O B. It's a growing field.
O c. Many options in this field allow you to help other people through
your job.
D. All of the above.
Answer: I think the answer is option D.
forms of energy!! matching game PLZ I NEED HELP !!!
What is special relativity
Answer:
In physics, special relativity (also known as the special theory of relativity) is the generally accepted and experimentally confirmed physical theory regarding the relationship between space and time.
We need special relativity in order to solve for quantum gravity. ... The earth was expanding (thus, it's mass was expanding) through space in all directions in order to create gravity **OOPS** forgot, specifically at an accelerating rate… OR… The space must be pushing toward or down on the earth, from every direction.
Answer:
The theory of special relativity explains how space and time are linked for objects that are moving at a consistent speed in a straight line. ... The theory of special relativity was developed by Albert Einstein in 1905, and it forms part of the basis of modern physics.
Explanation:
Which of the following statements best describes the second law of
thermodynamics?
A. Heat flows spontaneously from hot to cold, and entropy
decreases.
B. Heat flows spontaneously from hot to cold, and entropy increases.
C. Heat flows spontaneously from cold to hot, and entropy increases.
D. Heat flows spontaneously from cold to hot, and entropy
decreases.
Answer:
B
Explanation:
Heat flows from hot to cold to lower the temperature of hot areas and increase temperature of cold areas. The end result is that the 2 areas have the same temperature, thus increasing entropy.
Heat flows spontaneously from hot to cold, and entropy increases.
The second law of thermodynamics relates to the entropy of a system. According to the second law of thermodynamics, the total entropy of a system may increase or remain constant in a spontaneous process.
The implication of this is that the entropy of a system never decreases. The entropy of a system increases when heat flows from a hot to a cold body and not vice versa.
Hence, the statement that; "Heat flows spontaneously from hot to cold, and entropy increases" describes the second law of thermodynamics.
Two waves with amplitudes of 52 units and 98 units come together. Their amplitude, which is measured at a specific point and time, is 46 units. What wave behavior explains this value? A. destructive interference B. constructive interference C. refraction D. diffraction E. partial transmission
Answer: A
destructive interference
Explanation: Interference involves coming together of two waves of the same type. E.g sound waves, water waves e.t.c
Whenever two waves of different amplitude interferes with one another and there is increase in amplitude, this is known as constructive interference.
But whenever there is decrease in amplitude as a result of interference of the two waves, this is known as destructive interference.
If Two waves with amplitudes of 52 units and 98 units come together. Their amplitude, which is measured at a specific point and time, is 46 units. The wave behavior that explains this value is destructive interference because of decrease in the units of amplitude.
Answer:
destructive interference
Explanation: Plato user
Frames of Reference Practice Solutions
A girl is on a train that is headed East at 100 miles per hour. The girl is walking at 5 miles per hour
toward the back of the train.
1.
What is the speed and direction of the train if the girls is the frame of reference?
Answer:
5 mph East.
Explanation:
If the girl is the frame of reference, we need to check the train's relative movement to the girl.
If the girl was not moving inside the train, the speed of the train would be zero, because the train and the girl would be moving together with the same speed and direction.
If the girl is moving 5 mph toward the back of the train, the movement of the train should be calculated considering the girl is fixed (not moving).
So the direction of the train movement would be the inverse of the girls movement (the girl is going West), then the speed and direction of the train is 5 mph and East.
Mechanical energy is..
A. Found in machinery only
B. usually measured at the atomic level
C. the sum of the chemical and thermal energy of an object
D. the sum of the kinetic and potential energy of an object
Answer:
D
Explanation:
Mechanical energy is all about movement
Also kinetic and potential energy are mechanical
Question 2 (2 points)
Practice tests are available online.
True
False
K12