The cross-sections of metal beams in the shape of the letter I instead of solid rectangles because I beam is used horizontally, the stress is more at the top and in the bottom, and the middle is a stress free region.
Any cross section of the beam experiences bending and shearing stresses as a result of forces and couplings operating on it.
In an I beam, high weights can be carried while weighing less than in a rectangular beam.
The cross sections of metal beams are in the shape of letter I instead of solid rectangles to reduce the weight of the beam while preserving the resistance to bending.
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Bill drives west at 20\, \dfrac{\text m}{\text s}20 s m 20, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction, then slows to a stop at the red light. A graph of his velocity over time is shown below, where eastward is the positive velocity direction.
Answer:
This
Explanation:
Khan academy answer
Which of the following scenarios would result in an increase of kinetic
energy?*
A) An object at rest at a height of 10 meters
B) A car accelerating from 10 m/s to 20 m/s
C) A car coming to a stop
Answer:
B) A car accelerating from 10 m/s to 20 m/s
Explanation:
I explained this yesterday.
A car hits a wall with a force of 80 N and
has a mass of 4.5 kg. What was the
acceleration of the car?
Which describes the motion in a convection current? horizontal motion only vertical motion only linear motion circular motion
Answer:
circular motion
Explanation:
Circular motion can be regarded as
movement of particular object along the circumference in a circle. It is
rotation of particular object along a circular path. Circular motion could be
uniform, along with constant angular rate of rotation as well as constant speed. It could also be non-uniform along with changing rate of rotation. The acceleration that is been experienced when one is in uniform circular motion is called"Centripetal acceleration"
Convection currents is type of current that takes place after a reservoir of fluid has been heated at the bottom, then cool at the top.the fluid expand as a result of Heat , then density decreases, the plates on top of them is been carried as a result of circular motion of the convection
A convention current is a circular movement which is set up due to temperature difference between two layers of a fluid.
What is a convection current?A convention current is a movement which is set up due to temperature difference between two fluids.
Convection currents are set up in liquids and gases.
Hotter and less dense fluids move upwards while colder and denser fluids move downwards.
Therefore, convection currents involve circular motion.
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How does radiation occurs on earth or in space?
Answer:
Space radiation is made up of three kinds of radiation: particles trapped in the Earth's magnetic field; particles shot into space during solar flares (solar particle events); and galactic cosmic rays, which are high-energy protons and heavy ions from outside our solar system.
Explanation:
Calculate the momentum elephant of a 2020 kg elephant charging a hunter at a speed of 7.49 m/s .
Answer:
15129.8 Kg•m/s
Explanation:
From the question given above, the following data were obtained:
Mass = 2020 kg
Velocity = 7.49 m/s
Momentum =?
Momentum is simply defined as the product of mass and velocity. Mathematically, it is expressed as:
Momentum = mass × velocity
With the above formula, we can obtain the momentum of the Elephant as follow:
Mass = 2020 kg
Velocity = 7.49 m/s
Momentum =?
Momentum = mass × velocity
Momentum = 2020 × 7.49
Momentum = 15129.8 Kg•m/s
Thus, the momentum of the Elephant is 15129.8 Kg•m/s
The three main stages to the memory process are encoding, storage, and retrieval.
A.True B.False
Answer:
A
Explanation:
Answer:
a- true
Explanation:
i did the test and its correct
A sphere is released into the atmosphere where air resistance is present. As it falls it loses 7J of potential energy. How much kinetic energy did it gain?
Answer:
7 J
Explanation:
Given that,
A sphere is released into the atmosphere where air resistance is present.
The lose in energy is equal to 7 J
We need to find the gain in its kinetic energy.
We know that, as per the law of conservation of energy,
Loss in potential energy = gain in kinetic energy
⇒
Gain in kinetic energy = 7 J
Hence, the gain in kinetic energy is 7 J.
how slow would a 60,000 kg freight car have to roll to have the same momentum as an 80 kg person running 6.5 m/s
(8 and 2/3) millimeters per second.
That's about 0.02 mile per hour.
A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative x direction and has a magnitude of 2.48 mT. At one instant the velocity of the proton is in the positive y direction and has a magnitude of 1840 m/s. At that instant, what is the magnitude of the net force acting on the proton if the electric field is (a) in the positive z direction and has a magnitude of 5.19 V/m, (b) in the negative z direction and has a magnitude of 5.19 V/m, and (c) in the positive x direction and has a magnitude of 5.19 V/m
Answer:
a) F = 15.6 10⁻¹⁹ k^ N, b) F = -1 10⁻¹⁹ k^ N,
c) F = (8.3 i^ + 73 k^) 10⁻¹⁹ N
Explanation:
In this exercise we calculate the magnetic and electric force separately.
Let's start by calculating the magnetic force
F_m = q v x B
where bold letters indicate vectors, the modulus of this expression is
F_m = q v B
the direction is given by the right hand rule, where the thumb points in the direction of velocity, the fingers are extended in the direction of the magnetic field and the palm is in the directional ne force if the charge is positive
let's calculate the magnitude
F_m = 1.6 10⁻¹⁹ 1840 2.48 10⁻³
F_m = 7.3 10⁻¹⁹ N
we calculate the direction, the thumb is in the direction of + y,
fingers extended in the direction of -ax
the palm remains + z
therefore the magnetic force is in the direction of the positive side of the z axis
The electric force is
F_e = q E
give several possibilities for the electric field
a) electric field E = 5.19 V / m in the direction of + z
we calculate
F_e = 1.6 10⁻¹⁹ 5.19
F_e = 8.3 10⁻¹⁹ N
the total force is
F = F_m + F_e
F = (8.3 k ^ + 7.3 k ^) 10⁻¹⁹
F = 15.6 10⁻¹⁹ k^ N
b) in the -z direction
F_e = -8.3 10⁻¹⁹ k^ N
F = Fm + Fe
F = (-8.3 k ^ + 7.3 k ^) 10⁻¹⁹
F = -1 10⁻¹⁹ k^ N
c) in the + x direction
F_e = 8.3 10⁻¹⁹ i^ N
the total force is
F = (8.3 i^ + 73 k^) 10⁻¹⁹ N
Define the term kinetic frictional force
Answer:Kinetic friction is defined as a force that acts between moving surfaces. A body moving on the surface experiences a force in the opposite direction of its movement. The magnitude of the force will depend on the coefficient of kinetic friction between the two material.
Explanation:
I have an unknown volume of gas at a pressure of 0.500 atm and a temperature of 325 K. If I raise the pressure to 1.20 atm, decrease the temperature to 320. K, and measure the final volume to be 48.0 liters, what was the initial volume of the gas?
Answer:
117
Explanation:
the formula is P1V1 over T1 is equals to P2V2 over T2
Three people push a piano on wheels with forces of 130 N to the right, 150 N to the left, and 165 N to the right. What is the strength and direction of the net force on the piano?
Answer:
45 N to the right possibly?
How far is it between the cafeteria and the swimming pool
A.
length
B.
volume
C.
distance
D.
displacement
A girl kicks a blue ball with a velocity of 20.0 m/s at 65.0o. How long is it in the air?
1.85s
1.92s
13.6s
3.69s
Explanation:
t = usin©/g
Where t is the time to reach the maximum height
Time spent in air is T = 2t
Hence, T = 2usin©/g
T = 2 x 20 x sin 65°/ 9.8
T = 3.69s
A 12.0 volt battery is connected in a series to 4 identical 5.00 ohm resistors connected in parallel to each other. What is the current through the battery?
Answer:
9.6 Amperes
Explanation:
since the resistors are connected in parallel connection the equivalent resistance is1/R = 1 /5 + 1/5 + 1/5 + 1/5
solving for R we get 5/4 ohms
then from V=IR
I = V/R
I=12/(5/4)
hence I= 9.6 Amperes
A 12.0-volt battery is connected in a series, then the current through the battery is 9.6 A.
What are Resistors?Electrical resistance is implemented as a circuit element by resistors, which are passive two-terminal electrical components. Resistors are devices that are used in electronic circuits for a variety of purposes, including lowering current flow, adjusting signal levels, dividing voltages, biasing active components, and terminating transmission lines.
As part of motor controllers, power distribution systems, or as test loads for generators, high-power resistors that can dissipate many watts of electrical energy as heat may be used.
According to the question,
1/R = 1 /5 + 1/5 + 1/5 + 1/5
R = 5/4 ohms
By ohm's law,
V=IR
I = V/R
I=12/(5/4)
I= 9.6 Amperes
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Please help Draw where the rays will go and label the type of mirror.
Answer:
Explanation:
Please check the picture and consider straight lines
WILL MAKE BRAINLIEST! How does Hooke’s law help us understand the force and energy in elastic materials?
Answer:
How does Hooke’s law help us understand the force and energy in elastic materials?:
When the elastic materials are stretched, the atoms and molecules deform until stress is been applied and when the stress is removed they return to their initial state
Explanation:
Which of the waves has the smallest amplitude?
A. The blue wave
B. The orange wave
C. The green wave
D. The red wave
Answer:
I think its the Blue wave, im not sure so dont take my word for it.
Explanation:
Answer: it’s the green wave
Explanation: trust me bro
What is the equivalent of 0° C in Kelvin?
Help will give brainiest
Answer:
273.15 dat is the answer im pretty sure
Two balls are rolling using the same force. Which law explains why the bowling ball will roll a shorter distance than a soccer ball ?
1. Newton's 1st law
2. Newton's 2nd law
3. Newton's 3rd law
Answer:
newton's 2nd law
Explanation:
In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST The actual subject is Science but they dont have that as a option in pick a subject
Answer:
I believe it is D. Based on the point and it being Position vs. time I believe D makes the most sense. Sorry if I am wrong!
Explanation:
Answer:
25/30 = 0.83
Explanation:
I took this class
What is the momentum of a 200 kg truck travelling at 20 m/s?
Answer:
p = 4000 kg-m/s
Explanation:
Given that,
The mass of a truck, m = 200 kg
Speed of the truck, v = 20 m/s
We need to find the momentum of the truck. The formula for momentum is given by :
p = mv
so,
[tex]p=200\times 20\\\\p=4000\ kg-m/s[/tex]
So, the momentum of the truck is equal to 4000 kg-m/s.
A roller coaster has a mass of 250 kg,
and is 50 meters above the ground, what
is the potential energy?
A roller coaster has a mass of 250 kg, and it is 50 meters above the ground, then the potential energy will be equal to 122.5 KJ.
What is Potential energy?Potential energy is a type of energy stored that depends on the interaction between various substances. A spring's energy rises when it is crushed or expanded. A steel ball has more energy stored if it is lifted just above the floor as contrasted to dropping to the ground. As raised, it can do greater labor.
Instead of being a property of specific entities or atoms, potential energy is a property of systems. For instance, a system made up of Earth and the raised ball has far more stored energy as they move apart.
In system components, where the configurations, or spatial arrangements, dictate the magnitude of the forces that apply against one another, potential energy arises.
From the data given in the question,
Mass, m = 250 kg
Height, h = 50 meters and,
g = 9.8 m/s²
[tex]Potential energy(PE)=mgh[/tex]
PE = 250 × 50 × 9.8
PE = 122500 J or,
PE = 122.5 KJ.
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Which of the following terms describes the area where the Himalaya Mountains formed?
A.Divergent Boundary
B.Convergent Boundary
C. Subductive Zone
D. Transform Boundary
Answer:
B
Explanation:
The Himalayan Mountains formed at a convergence plate boundary between the Eurasian plate and the Indian plate.
This graph shows the energy of a reaction over time. Which statement is
true?
A. H represents the energy of the products.
B. G represents the activation energy.
C. G represents the energy of the products.
D. F represents the activation energy
Answer: D.
Explanation: Just took the quiz.
Answer:
D. F represents the activation energy
Explanation:
PLEASE HELP!!!!!!!!!!!!!!!!Match the label with the reason it might be important to the consumers.
1. country of origin
Kelli only buys vegetables grown
without pesticides.
Angie only buys foods made with
2. Organic Certification
sea salt to cut sodium intake.
3. dietary guideline
Nikki prefers to buy local products
to lessen her carbon footprint.
Answer:
1 is Nikki
2 is Kelli
3 is Angie
Explanation:
Hope this helps!
HELP pleaseee which nucleus completes the following equation?
Answer:
its D
Explanation:
i just got it correct on a. p. e. x. :)
What type of energy is thermal energy? A. Sound energy B. Chemical energy C. Kinetic energy D. Nuclear energy
Answer:
kinetic energy
Explanation:
What is the transfer of energy from a wave to the medium through which travels
Answer:
'Wave' is a common term for a number of different ways in which energy is transferred: In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels.