Answer:
Water
Explanation:
Just took it and got a 100 :)
Cars powered by hydrogen fuel cells will emit hydrogen. The correct option is C.
What is a hydrogen fuel cell?
If hydrogen is produced using a process that does not require carbon, it can be burned with oxygen and emits no carbon when doing so. It can be applied to internal combustion engines or fuel cells.
One endeavor to lower vehicle emissions is the development of cars driven by hydrogen fuel cells. These vehicles use hydrogen gas that has been kept under specific circumstances to produce electricity that powers the motor.
Water vapors are released when hydrogen and oxygen are burned. It doesn't release any dangerous chemicals, including greenhouse gases. It is a substitute that has no emissions that harm the environment. It is a very good choice for the future, especially given the current level of pollution around the globe and the depletion of fossil resources.
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Please help me with this problem for physics !
Answer:
2 m/s²
Explanation:
velocity =
[tex] \frac{20 - 0}{10} [/tex]
20/10 = 2
The first Tacoma Narrows Bridge in Washington crossed over a strait in Puget Sound. At the time the suspension bridge was built, construction workers noticed that it moved up and down in the wind. Measures to stop the bridge's movement were ineffective, but the bridge was opened to the public on July 1, 1940. The bridge collapsed on November 7, 1940. Luckily, no people were seriously injured. Determine which technological design criteria the Tacoma Narrows Bridge did and did not meet. Explain your answer.
Answer:
Follows are the solution to this question:
Explanation:
When the Tacoma Narrows Bridge was built, it may not have met the technical design requirements and when it didn't solve the problem for long so, the bridge will be unsustainable and fell. or we can say that Due to an aeroelastic flutter caused by high winds, the bridge collapsed. The bridge oscillated rapidly and ultimately dropped. Its collapse of the bridge has lasting impacts on science and technology.
Answer:
When the Tacoma Narrows Bridge was built, it may not have met the technical design requirements and when it didn't solve the problem for long so, the bridge will be unsustainable and fell. or we can say that Due to an aeroelastic flutter caused by high winds, the bridge collapsed. The bridge oscillated rapidly and ultimately dropped. Its collapse of the bridge has lasting impacts on science and technology.
A train moves with a uniform velocity of 10 m/s for 8s find the distance traveled by it
An apple has 6 J of energy. The apple sits on a counter 3 m high. What is the mass of the apple?
Explanation:
PE= mgh
6 J= (3m) (9.81 m/s2) (mass)
mass=( 6)/(3×9.81)
mass= 0.20 Kg
The mass of the apple is 0.2 kg
From the question,
We are to determine the mass of an apple that sits on a counter 3m high.
From the given information,
The apple has an energy of 6 J. This energy is the apple's potential energy.
From the formula for potential energy, P.E, we have that
P.E = mgh
Where m is the mass
g is the acceleration due to gravity (Take g = 9.8 m/s²)
h is height
From the question
P.E = 6J
h = 3 m
Putting the parameters into the formula, we get
6 = m × 9.8 × 3
6 = m × 29.4
∴ m = 6 ÷ 29.4
m = 0.20408 kg
m ≅ 0.2 kg
Hence, the mass of the apple is 0.2 kg
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5. How will you separate water from petrol?
Answer:
by a seprating funnel or let it stand it will settle on its own
Explanation:
Answer:
How will you separate water from petrol?
Pluto was laying at rest in the sun and notices the smell of meat. He runs at 8 m/s to the smell of the meat. How fast is the dog accelerating in 2 s ?
Given parameters:
Initial velocity(body is at rest) = 0m/s
Final velocity = 8m/s
Time of acceleration = 2s
Unknown:
Acceleration of the dog = ?
Acceleration is defined as the change in velocity with time.
Mathematically;
Acceleration = [tex]\frac{Final velocity - Initial velocity}{time taken}[/tex]
Now input the given parameters and solve;
Acceleration = [tex]\frac{8-0}{2}[/tex]
Acceleration = 4m/s²
The dog is accelerating at a rate of 4m/s²
Erica throws a tennis ball against a wall, and it bounces back. Which force is responsible for sending the ball back to Erica?
OA. the force that the ball exerts on the wall
OB. the frictional for between the wall and the ball
OC, the acceleration of the ball as it approaches the wall
OD. the normal force that the wall exerts on the ball
w
5
4. If it takes 105 calories to warm 100 g of aluminum from 20° C to 25° C, what is the
Specific heat of aluminum?
Answer:
Given parameters:
Amount of heat = 105calories
Mass of aluminium = 100g
Initial temperature = 20°C
Final temperature = 25°C
Unknown:
Specific heat of aluminium = ?
The amount of heat absorbed by a substance is the quantity of heat required to change the temperature of a system by 1°C.
Mathematically;
H = m C (ΔФ)
where H is the amount of heat
m is the mass of the substance
C is the specific heat
ΔФ is the change in temperature
Now to find specific heat capacity, we make it the subject of the formula of the expression;
C = [tex]\frac{H }{m x change in temperature}[/tex]
Change in temperature = Final temperature - initial temperature
= 25°C - 20°C
= 5°C
C = [tex]\frac{105calories}{100g x 5}[/tex] = 0.21cal/g°C
The specific heat of the aluminium is 0.21cal/g°C
is the change in position of an object
Answer:
Explanation:
In my opinion motion is the correct answer
a drag racer starts from the rest and accelerates at 7.4m/s^2.how far will he travel in 2.0 seconds?
Answer:
14.8 m
Explanation:
S= ut + [tex]\frac{1}{2}[/tex]a[tex]t^{2}[/tex]
where u = initial velocity
S= (0 [tex]\frac{m}{s}[/tex])(2[tex]s[/tex]) + [tex]\frac{1}{2}[/tex](7.4[tex]\frac{m}{s^{2} }[/tex])(2[tex]s^{2}[/tex])
S= [tex]\frac{1}{2}[/tex](7.4[tex]\frac{m}{s^{2} }[/tex])(2[tex]s^{2}[/tex])
S=14.8 m
A glass of water with a mass of 0.35 kg rests on the edge of a desk 0.85 m
above the floor. Given that the acceleration due to gravity is 9.8 m/s2, what is
the glass's potential energy?
A. 4.04 J
B. 1.24 J
C. 2.92 J
D. 0.03 J
Answer: c
Explanation:
A glass of water with a mass of 0.35 kg rests on the edge of a desk 0.85 m above the floor. Given that the acceleration due to gravity is 9.8 m/s2. so, the glass's potential energy is 2.92 Joule.
To find the potential energy,
The given values are,
Mass m = 0.35 Kg
Height h = 0.85 m
g = 9.8 m/s²
What is Gravitational Potential Energy?Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
U = mgh Joules.
Where m is the mass of the object,
h is the height with respect to a fixed reference, and
g is the acceleration of gravity, or 9.8 m/s^2.
The glass of water has a mass of m=0.35 kg and it's located at a height of h=0.85 m. Calculating the potential energy:
U = 0.35× 9.8×0.85
U = 2.9155 Joules.
The glass's potential energy is 2.92 Joule.
Hence, Option C is the correct answer.
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In a skateboard race, the winner covered 26 meters in 3.88 seconds . What was his speed?
name the instrument used to control current in an electric circuit.
Guys please help me
The instrument which is used to control current in an electric circuit is rheostat.
Hope this helps :)
Answer:
or bhai kya haal h
hum bhi india se hi h
A sports car and a minivan run out of gas and are pushed to the side of the road. Which is easier to push, and why?
the minivan, because it has more mass and therefore more inertia
the minivan, because it has less mass and therefore less inertia
the sports car, because it has more mass and therefore more inertia
the sports car, because it has less mass and therefore less inertia
Answer:
the last one
Explanation:
Just took the test
The sports car is easier to push because it has less mass and therefore less inertia.
What is mass and inertia?Inertial mass is the property of an object that determines how its motion changes when a force acts on it.
Inertia is the resistance of any physical object to a change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed when no forces act upon them.
The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. The amount of inertia an object has is determined by its mass. The mass of a substance or object is based on the number and density of atoms in it.
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Compared to visible light, ultraviolet radiation is more harmful to human skin and eyes because ultraviolet radiation has which of the
following characteristics?
A higher frequency
B. longer wavelength
C. higher speed
D. longer period
The ultraviolet radiation should contain the characteristics of the higher frequency.
What is ultraviolet radiation?Ultraviolet (UV) radiation should be a form of unionized radiation that should be emitted from the sun and from artificial sources. Also, it resulted in the risk related to the health in terms of human skin & eyes. It includes the high frequency that represents it contains more energy at the time of emission. Also, it does not consider the high speed, long period, and long wavelength.
Therefore, the correct option is A.
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25pts and brainlyiest if you get right What is the best explanation for how nuclear fusion contributes to the life cycle of a star?
A) Hydrogen in the core of the star is converted to helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes stable and expands.
B) Helium in the core of the star is converted to hydrogen by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and expands.
C) Hydrogen in the core of the star is converted to helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and contracts.
D) Helium in the core of the star is converted to hydrogen by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and contracts.
Answer:
Hydrogen in the core of the star is converted to helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and contracts.
Explanation: i took the test
Answer:
C if u know u know
Explanation:
A roller coaster starts down hill at 15.3 m/s. Five and half seconds later, its speed is 42 m/s. Find the acceleration of the roller coaster.?
Answer:
This is just simple math. Your answer would be 26.7 m/s
Explanation:
definition of motion?
Answer: The action of something moving or being moved
Explanation:
Select the correct answer.
If the amplitude of a sound increases, which statement is true?
O A. The sound energy decreases.
OB.
The wavelength of the sound increases.
O C. The loudness of the sound increases.
OD. The pitch of the sound increases.
Answer:
B is the best answer for the question
Answer:
C
Explanation:
A hollow circular nylon pipe (see fig) supports a load PA = 1750 lb, which is uniformly distributed around a cap plate at the top of the lower pipe. A second load PB is applied at the bottom. The inner and outer diameters of the upper and lower parts of the pipe are d1 = 2 in., d2 = 2.375 in., d3 = 2.25 in., and d4 = 2.5 in., respectively. The upper pipe has a length L1= 14in., the lower pipe length is L2 = 16 in. Neglect the self-weight of the pipes. -If PA remains unchanged, find the new value of PB (in lb) so that upper and lower parts have same tensile stress.
Answer:
The value of [tex]P_{B}[/tex] is 4586.20 lb.
Explanation:
Given that,
Load = 1750 lb
The inner and outer diameters of the upper and lower parts of the pipe are
[tex]d_{1}=2\ in[/tex]
[tex]d_{2}=2.375\ in[/tex]
[tex]d_{3}=2.25\ in[/tex]
[tex]d_{4}=2.5\ in[/tex]
Length of upper pipe = 14 in
Length of lower pipe = 16 in
We need to calculate the value of [tex]P_{B}[/tex]
Using tensile stress in upper segment
[tex]\sigma_{1}=\dfrac{P_{A}+P_{B}}{A_{1}}[/tex]....(I)
Tensile stress in lower segment
[tex]\sigma_{2}=\dfrac{P_{B}}{A_{2}}[/tex].....(II)
From equation (I) and (II)
[tex]\dfrca{P_{B}}{A_{2}}=\dfrac{P_{A}+P_{B}}{A_{1}}[/tex]
[tex]P_{B}A_{1}=A_{2}P_{A}+A_{2}P_{B}[/tex]
[tex]P_{B}(A_{1}-A_{2})=P_{A}A_{2}[/tex]
[tex]P_{B}=\dfrac{P_{A}A_{2}}{A_{1}-A_{2}}[/tex]
[tex]P_{B}=\dfrac{\dfrac{P_{A}}{A_{1}}}{\dfrac{1}{A_{2}}-\dfrac{1}{A_{1}}}[/tex]
[tex]P_{B}=\dfrac{\dfrac{1750}{\dfrac{\pi}{4}(d_{2}^2-d_{1}^2)}}{\dfrac{1}{\dfrac{\pi}{4}\times(d_{4}^2-d_{3}^2)}-\dfrac{1}{\dfrac{\pi}{4}\times(d_{2}^2-d_{1}^2)}}[/tex]
Put the value into the formula
[tex]P_{B}=\dfrac{\dfrac{1750}{\dfrac{\pi}{4}((2.375)^2-(2)^2)}}{\dfrac{1}{\dfrac{\pi}{4}\times((2.5)^2-(2.25)^2)}-\dfrac{1}{\dfrac{\pi}{4}((2.375)^2-(2)^2)}}[/tex]
[tex]P_{B}=4586.20\ lb[/tex]
Hence, The value of [tex]P_{B}[/tex] is 4586.20 lb.
I need help Will give five stars please show work please
Answer:
These has anwers and also the solution. You can recheck if you want.
A _________ is a graphical representation of association between variables.
A.
scatterplot
B.
regression plot
C.
graphical plot
D.
variable plot
Please select the best answer from the choices provided
A
B
C
D
What type of energy change occurs as a match burns?
Answer:
elaborate
Explanation:
you need to elaborate im just doing this for points but u need to elaborate
Muscular strength is BEST described by
A. the ability of a muscle to contract repeatedly
B. the average metabolic efficiency of muscles
C. the force produced in a single maximum effort
D. daily levels of physical activity and exertion
Please select the best answer from the choices provided.
Α
В
C
D
Answer:
C. Muscular strength is the force produced in a single maximum effort.
Explanation:
Muscular has a definition similar to strength but strength is the ability to carry heavy things, Muscular is like having puberty, a(bs). So that is force with strength you can carry with force, in maximum affort.
Frieda makes a pyramid of oranges for a display at the grocery store. A few minutes later, Corwin bumps into the display and the oranges spill down.
Which change of state does the motion of the oranges most closely model?
melting
freezing
condensation
sublimation
Answer:
Melting
Explanation:
I just took the quiz and got it right.
When a car traveling at 30m/s hits the gas pedal up to 65m/s in 3.5 sec what is the cars acceleration during that time
Answer:
d
Explanation:
anis walks 1 km north and then turns west and walks 2 km. That is the distance
and displacement in km? In m?
Answer:
d = 3 Km =3,000 m
x=2.236 Km = 2,236 m
Explanation:
Distance and Displacement
When an object moves, it describes a certain path from the staring to the ending point. The sum of all the individual path lengths is called distance.
The length of the path measured from the start to the endpoint regardless of the individual paths taken is called displacement.
Anis walked 1 Km north and then 2 Km west. The total distance traveled is:
d=1 Km + 2 Km = 3 Km
d = 3 Km
We can express it in meters, recalling 1 Km = 1,000 m:
d = 3,000 m
The displacement is computed as the length of the segment from the origin to the point located at 1 Km north, 2 Km west. These movements describe a right triangle whose legs are 1 Km and 2 Km. The required displacement is the hypotenuse of the triangle:
[tex]x=\sqrt{1^2+2^2}=\sqrt{5}\approx 2.236\ Km[/tex]
x=2.236 Km
Converting to meters:
x=2,236 m
If a ball is thrown horizontally, and the initial horizontal velocity is 5 m/s, what will be the final horizontal velocity? *
Answer:
5 m/s
Explanation:
Assuming no air resistance, the horizontal acceleration is 0 m/s². So the final velocity is the same as the initial velocity.
A car travels a distance of 36 m in 12 seconds How fast is the car moving?
some people will realize that they are dreaming while the dream is happening. this is called
A. REM
B. semantic dreaming
C. lucid dreaming
D. sleep talking
Answer:
the answer is lucid dreamers ..hope it helped you dear
