A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?
Answers
Volume = 0.08 m³
Mass = 0.08 of 7840 kg = 627.2 kg
Now I'm going to give you the correct answer to your question, and then,
after that, I'm also going to give you the answer you expect.
The correct answer is: (Ryan2 the Expert in Answer #1 is correct) . . . . .
The force of gravity on a mass doesn't depend on what it's sunk in, surrounded by,
hanging from, or resting on. As long as it's on or near the Earth's surface, the force
of gravity acting on it is the same, no matter what else is around.
Force of gravity (weight) = (mass) x (gravity) = 627.2 kg x 9.8 m/s² = 6146.56 newtons
=============================================
The apparent weight is less, because when it's immersed in a fluid, there's
a buoyant force acting on it, which cancels part of the force of gravity.
The buoyant force = weight of the displaced water.
Assume the density of water is 1 kg per liter = 1,000 kg per m³.
Then the weight of 0.08 m³ of water is (80 kg x 9.8 m/s²) = 784 newtons.
This is the upward buoyant force on the steel when it's in water,
and it makes the steel seem 784 newtons lighter in water. So the
apparent weight of the steel in water is
6146.56 minus 784 = 5362.56 newtons.
That's why you can pick up your big brother in the swimming pool.
The force of gravity on him doesn't change, but the buoyant force
in the water balances part of the force of gravity, and makes him
seem to weigh less.
If he could blow himself up like a balloon, and displace enough water
to weigh just as much as he really does, then the buoyant force would
cancel his weight completely, and he would totally float !
That's how steel ships float in water. They're shaped in a shape that can
displace a lot of water. The whole secret is in the shape.
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A whale comes to the surface to breathe and then dives at an angle of 20.0 ∘ below the horizontal. If the whale continues in a straight line for 200 m , how deep is it?
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In a classroom demonstration, students are using a Slinky to observe and learn about wave properties. If the Slinky has a period of 0.333 seconds, what is the frequency?
PLZ EXPLAIN THE EQUATION AND I WILL GIVE BRAINLIST You are out and about in the country and your father sees a rock that he really wants in the yard. Now you must get the very heavy rock into the back of a truck. The truck bed is 3 feet off the ground. Your father pulls out a 5-foot plank and begins to set up a ramp. At the same time, you (who know about mechanical advantage!) have found a plank that is 8 feet long, and you show it to your father. Which plank will give you the most mechanical advantage? Calculate the MA for each plank
Answers
During the respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as as carbon-dioxide and water.
The overall reaction is
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
The reaction is exothermic reaction because C=O and O-H bonds in the products are so much more stable than the bonds in the reactants.
Bond energy is the average needed to break a bond.
Some bond energies are:
C-C = 347 kJ/mol
C-H = 413kJ/mol;
C-O = 358 kJ/mol;
O-H = 467 kJ/mol;
O=O = 495 kJ/mol;
C=O = 799 kJ/mol
Final answer:
Respiration is an exothermic reaction because it releases more energy than it absorbs in the form of heat to its surroundings. All such reactions require an initial energy input, known as 'activation energy', to start the reaction. In an exothermic reaction, the heat content 'q' is negative, showing the transfer of thermal energy from the system to its surroundings.
Explanation:
Respiration is an "exothermic reaction", which means it is a chemical reaction that releases energy in the form of heat to its surroundings. This is achieved through the catabolism of foods in your energy bar, which is an example of an exergonic reaction. This reaction absorbs some of the chemical energy stored in the food, turns it into molecules your body can use, and releases the excess energy into the surroundings. However, all chemical reactions, including exothermic and endothermic reactions, require a small amount of energy to activate them.
During an exothermic reaction, there is a net release of energy despite this initial energy input. The energy given off is more than the energy absorbed. This process represents the concept of 'activation energy', an energy barrier that needs to be overcome for the reaction to proceed. Therefore, the heat content, often represented as 'q', is negative in an exothermic reaction, indicating that the system gives off thermal energy to the surroundings, making the surrounding environment warmer.
Learn more about Exothermic Reactions here:
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b.850 ma
c.550 ma
d.280 ma
e.650 ma
Answers
the current approximately 7.0 ms after closing the switch is about 250 mA, which is option (a).
To find the current through the circuit 7.0 ms after the switch is closed, we can use the concept of an RL circuit. The current in an RL circuit follows an exponential growth equation, given by:
I(t) = (V/R)(1 - e^(-t/τ))
Where:
I(t) is the current at time t.
V is the voltage from the power supply (15 V in this case).
R is the resistance (60 Ω).
τ (tau) is the time constant of the circuit, given by L/R, where L is the inductance (45 mH = 0.045 H).
First, calculate the time constant τ:
τ = L/R = 0.045 H / 60 Ω = 0.00075 s.
Now, plug in the values into the equation to find I(7.0 ms):
t = 7.0 ms = 0.007 s.
I(0.007 s) = (15 V / 60 Ω) * (1 - e^(-0.007 s / 0.00075 s))
I(0.007 s) = (0.25 A) * (1 - e^(-9.333...))
Now, calculate the current:
I(0.007 s) ≈ (0.25 A) * (1 - e^(-9.333...))
I(0.007 s) ≈ (0.25 A) * (1 - 0.0000962) [Using e^(-9.333...) ≈ 0.0000962]
I(0.007 s) ≈ (0.25 A) * (0.9999038)
I(0.007 s) ≈ 0.24998 A
I(0.007 s) ≈ 250 mA
So, the current approximately 7.0 ms after closing the switch is about 250 mA, which is option (a).
Learn more about RL circuit here:
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Initial current = 0
Final current = (15 V) / (60 ohms) = 0.25 Ampere
Current along the way = 0.25 · (1 - e^- time / time-constant)
"time-constant" = L/R = (0.045 / 60) = 7.5 x 10⁻⁴ second
Current = 0.25 · (1 - e^-10,000t/7.5)
When t = 7 ms,
Current = 0.25 · ( 1 - e^-70/7.5)
Current = 0.25 · (1 - e^-9.33)
Current = 0.25 · (1 - 8.84 x 10⁻⁵)
Current = 0.25 · (0.9999)
Current = so close to 250 mA that you can't tell the difference.
The reason is that 7.0 mS is 9.3 time-constants, and during EVERY time-constant, the current grows by 37% of the distance it still has left to go. So after 9.3 of these, it's practically AT the target.
I have a feeling that the time in the question is SUPPOSED TO BE 7 microseconds. If that's true, then
Current = 0.25 · (1 - e^-[ 7 x 10⁻⁶ / 7.5 x 10⁻⁴ ]
Current = 0.25 · (1 - e^-0.00933)
Current = 0.25 · (1 - 0.9907)
Current = 0.25 · (0.0093)
Current = 2.32 mA ?
No, that can't be it either.
Well ! Now, I'm going to determine the true and correct final answer in the only cheap and sleazy way I have left ... by looking at all the choices offered, and eliminating the absurd ones.
The effect of an inductor in the circuit is to resist any change in current. The final current in this circuit is when it's not trying to change any more. So the final current is just the battery with a resistor across it ... (12 V) / (60 ohms). That's 0.25 Ampere, or 250 mA. The current starts at zero when the switch closes, and it builds up and builds up to 250 mA. It's never more than 250 mA.
So look at the choices ! The only one that not more than 250 mA is choice-A .
THAT has to be it. 7.0 mS is a no-brainer. It's 9.3 time-constants after the switch closes, the current has built up to 99.99% of its final value by then, it's not really trying to change much any more, the inductor is just about finished having any effect on the current, and the current is essentially at its final value of 250 mA. The action is all over.
Now, I fully realize that Mister "Rishwait" is a bot and all, and nobody really needs the answer to this question. But every cloud has a silver lining. It's a numskull question, but it earned me 10 points, and it's been a truly fascinating trip down Memory Lane.
Answers
The reflection of Lin Yao at the back of the spoon must be an upright reflection of himself. The back of the spoon is the convex side. When Lin Yao will look at the inner side of the spoon, his reflection will be inverted. This is because the inner side of the spoon is the concave side.
Answer:
It is A upside down and smaller
Explanation:
i just grabbed a spoon and look at myself
it also depends on what side you are looking at if you look at the back side it a normal mirror but if you look at the front its upside down and smaller
Answers
Answers
Elements in the same group or family share important properties due to their similar electronic configurations and valence shell structure.
The periodic table is organized based on the electronic structure of atoms, specifically the arrangement of electrons in energy levels or shells. Elements within the same group or family of the periodic table have similar outer electron configurations, leading to shared properties and behaviors.
Elements in a group have the same number of valence electrons, which are the electrons in the outermost shell or energy level of an atom. Valence electrons are crucial because they determine an element's chemical reactivity and its ability to form bonds with other atoms.
Know more about Valence electrons:
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Answers
Answer:
Gamma rays
Explanation:
Gamma rays are usually defined as a type of electromagnetic radiations, that are characterized by the presence of shorter wavelength and higher energy. These are the common radiations that are released from the radioactive substances, where an unstable nucleus of an atom releases an excess amount of energy by undergoing continuous electromagnetic processes.
These are harmful to humans and other organisms, as they are comprised of very high energy and they can easily penetrate through the bodies of humans and other organisms.
These gamma particles are emitted in the power plants, where the people working in it wear a special type of device that helps them in monitoring the exposure to radiation.
It could also be gamma rays i don't really know