Answer:
C
Explanation:
Thermal energy is used to cook food. Thermal energy is heat. It's converted from either electrical potential energy or chemical potential energy, depending on the cooking appliance.
sorry if I'm wrong
How much potassium nitrate, KNO3, would completely dissolve in 100g of water at 40℃?
A. 28 grams
B. 108 grams
C. 45 grams
D. 65 grams
When a traffic light turns from red to green, it takes much more force and time for a large truck to get going than it does a small, compact car. This is an example of which law of motion?
Answer:
First Law of Motion.
Explanation:
Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.
In physics, Sir Isaac Newton's First Law of Motion is known as Law of Inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
The inertia of a physical object such as a truck is greatly dependent or influenced by its mass; the higher the quantity of matter in a truck, the greater will be its tendency to continuously remain at rest.
Hence, it would take much more force and time for a large truck to get going when the traffic light turns green than it does for a small, compact car. This is an example of the first law of motion.
A block of copper with mass 0.500 kg is heated to 400. degrees Celsius from 290. degrees Celsius. The specific heat capacity of copper is 387 J/ (kg*C°). The heat absorbed by the copper block is
7.74 E5 J
7.74 E4 J
5.61 E4 J
2.13 E5 J
2.13 E4 J
The heat absorbed can be calculated using calorimetric equation. The heat absorbed by the copper block of mass 0.500 kg for the temperature difference of 290 to 400 degree Celsius is 2.13 E4 J.
What is calorimetric equation?Calorimetry is an analytical tool used to determine the heat energy absorbed or released by a system. The calorimetric equation connecting the mass m, temperature difference ΔT and specific heat capacity c is given by:
q = m c ΔT .
Given,
m = 0.500 kg
c = 387 J/(kg °C )
ΔT = 400 - 290 °C = 110°C.
Then, the heat energy absorbed by the copper block is ;
q = 0.50 kg × 387 J/(kg °C ) × 110°C
= 2.13 E4 J
Therefore, option E is correct.
Find more on calorimetry:
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The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + O2
85g + 156g → 188g + ?
If the following materials are used during the reaction of magnesium, oxygen, and chlorine, what mass oxygen would we expect to see after the reaction and why?
A. 53g of O2, because all mass must be conserved.
B. 241g of O2, because all mass must be conserved.
C. 42.5g of O2, because all mass must be conserved, it would be half of the compound MgO in the products.
D. 106g of O2, because all mass must be conserved, it would be double the compound MgO in the products.
Pls answer correctly I really need a good grade on this.
Answer:
The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + O2
85g + 156g → 188g + 53g
53gas total mass in reactant is equal to product.
A.
53g of O2, because all mass must be conserved.
What distance did the boulder with a force of 24 Newtons travel if 240 joules of work was done on it?
d = 10 m
Explanation:
Work = force × distance
or
distance = work/force
= (240 J)/(24 N)
= 10 m
A un cuerpo de 4kg que está en reposo sobre la superficie de la tierra, se aplica durante 8seg una fuerza de 60N dirigida verticalmente hacia arriba. Calcule la altura máxima que alcanza el cuerpo.
Answer:
[tex] y_{t} = 253.94 m [/tex]
Explanation:
Para resolver este problema debemos contemplar dos tramos.
En el primer tramo, la fuerza aplicada impulsa al cuerpo a subir una altura dada debido a la aceleración que genera esa fuerza.
[tex] \Sigma F = ma [/tex]
[tex] F - P = ma [/tex]
[tex] F - mg = ma [/tex]
En donde:
F: es la fuerza aplicada = 60 N
P: es el peso del cuerpo = mg
m: es la masa del cuerpo = 4 kg
g: es la aceleración debido a la gravedad = 9.81 m/s²
a: es la aceleración
Entonces, la aceleración generada por la fuerza aplicada es:
[tex] a = \frac{F - mg}{m} = \frac{60 N - 4kg*9.81 m/s^{2}}{4 kg} = 5.19 m/s^{2} [/tex]
Ahora, debemos calcular la altura recorrida mientras el cuerpo está acelerado hacia arriba:
[tex] y_{{1}} = y_{0} + v_{0}t + \frac{1}{2}at^{2} [/tex]
En donde:
[tex] y_{1}[/tex]: es la altura final del tramo 1 =? [tex] y_{0}[/tex]: es la altura inicial = 0
[tex] v_{0}[/tex]: es la velocidad inicial = 0 (parte del reposo)
t: es el tiempo = 8 s
[tex] y_{1} = 0 + 0 + \frac{1}{2}5.19 m/s^{2}*(8 s)^{2} = 166.08 m [/tex]
Por lo tanto, mientras el cuerpo está acelerado (durante los 8 s) recorre 166.08 metros.
Ahora, en el segundo tramo el cuerpo sigue subiendo hasta alcanzar una altura máxima para luego comenzar a descender. Podemos usar la siguiente ecuación para calcular la altura recorrida.
[tex] v_{f}^{2} = v_{0}^{2} - 2gy_{2} [/tex]
En donde:
[tex] v_{f}[/tex]: es la velocidad final = 0 (en la altura máxima)
[tex] v_{0}[/tex]: es la velocidad inicial
Primero debemos encontrar la velocidad inicial en el segundo tramo, que es igual a la velocidad final del primer tramo:
[tex] v_{f} = \sqrt{v_{0} + 2ay_{1}} = \sqrt{0 + 2*5.19 m/s^{2}*166.08 m} = 41.52 m/s [/tex]
Entonces, la altura recorrida en el segundo tramo es:
[tex] y_{2} = \frac{v_{0}^{2} - v_{f}^{2}}{2g} = \frac{(41.52 m/s)^{2} - 0}{2*9.81 m/s^{2}} = 87.86 m [/tex]
Finalmente, la altura máxima es:
[tex]y_{t} = y_{1} + y_{2} = 166.08 m + 87.86 m = 253.94 m[/tex]
Espero que te sea de utilidad!
A proton traveling at a speed of 3.5x10 ^-6 m/s passes perpendicular to a uniform magnetic field of 4.2x10 ^-2 T. What is magnitude of the force on the proton while the proton is in the magnetic field?
Answer:
i think its 50
Explanation:
Calculate the electrical energy use of the microwave in 120 V circuit has 7.5 A current flow, if it used for 0.05 hours
Answer:
162 KJ
Explanation:
The electrical energy can be calculated using the formula
E = V×I×t
Where, V= voltage = 120 V
I is current in ampere = 7.5 A and t is time in seconds
1 hour = 3600 sec
Therefore, 0.05 hour = 3600×0.05 = 180 sec
Substitute the values in above equation find electrical power
E = 120×7.5×180
= 162000 J
= 162 KJ
Therefore, the electrical energy use of the microwave = 162 KJ
The particles of a gas are packed tightly together.
Answer:
False
Explanation:
Answer:
False, they are much loose than any of the other states of matter
To keep cool in the summer months, you decide to design and build your own hand-held fan. The fan's electrical circuit will run off of 4 AA batteries (each with a voltage of 1.5 V) and must not exceed 0.050 A of current. You visit your local Radio Shack and find that resistors are sold in five varieties: 5 Ohm, 10 Ohm, 12 Ohm, 20 Ohm, 50 Ohm. Each resistor costs 8 cents. What set of resistors should you buy to minimize cost?
Answer:
Two 50 Ohm Resistors, One 20 Ohm Resistor.
Explanation:
For the given current and voltage specifications, the resistance can be calculated by Ohm's Law:
[tex]V = IR\\\\R = \frac{V}{I}[/tex]
where,
R = Resistance = ?
V = Voltage = (1.5 V)(4) = 6 V
I = 0.05 A
Therefore,
[tex]R = \frac{6\ V}{0.05\ A}\\\\R = 120\ \Omega\\[/tex]
Now, to minimize the cost we will buy the following set of resistors:
Two 50 Ohm Resistors, One 20 Ohm Resistor.
The velocity-time graph shows the motion of a truck. Find (i) its velocity , (ii) its acceleration and (iii) the distance covered by the cyclist in 15 seconds
no spam please and answer fast!
Answer:
(iii) 300m
Explanation:
(i) The velocity of the cyclist is constant with time, the rate of the change of the velocity with the time is zero. So the acceleration of the object will be zero.
(ii) According to the graph we observe that the cyclist is moving with the same velocity all the time, therefore, the velocity of the cyclist is [tex]20m/s^{-1}[/tex]
(iii) Apply the formula: (speed = velocity x time)
s = vt
s = [tex]20m/s^{-1}[/tex] x 15s
s = 300m
Hope this helps :)
easy:- what are the instruments used in measuring temperature
Answer:
Instrumentos Para Medir La Temperatura
Termómetro de máxima y mínima:
Termómetro metálico:
Pirómetro:
Termohidrógrafo:
How do astronomers describe the scale of the universe?
No one can know the size of the universe, it may in fact be infinitely large.
Explanation:
No one knows the size of the universe because we can't see the entire universe. We can only see the part that is close enough to us that there has been time for the light from it to arrive here. What that means is any part of the universe that it will take more than 14.5 billion years for light to travel to us can not bee seen. It is possible that the universe has no size, that is it is infinite.
We can measure what we call the "visible universe" and that is a sphere around us with a radius of about 50 billion light years, the reason it is more than the age of the universe (14.5 billion years) is because the universe is expanding more rapidly than the speed of light.
The way scientists measure the size of the visible universe is with what is called red shift. Similar to the way a car horn's pitch changes as it passes you due to doppler shift, light too has a shift in is frequency or color depending on if it is moving away or toward you. As light moves away from you it shifts for red and the faster it is moving away the more it shifts. We can estimate the distance objects are away by how much they are red shifted. When we look at the most distance objects we can see they are about 50 million light years away.
name and discuss five good reasons why a crop can distribute well in a new areas of environment
Answer:
The description as per the given scenario is described below throughout the segment.
Explanation:
Plant development relies mostly on the earth's weather conditions as well as the quantity of sunshine it gets.The key elements influencing farming operations include temperature, natural vegetation as well as landforms.The smart utilization of genetic variation for the development of better plants could make an important contribution to environmental protection.Crop diversification includes verifying that appropriate amounts of food are provided not just steady as well as sustained.Species of crops resistant to parasites adverse conditions could decrease this need for dangerous chemicals.Which statement correctly describes magnetic field lines?
Answer: I believe the correct answer would be they join north pole to south pole. The direction of these lines always goes from the direction of north to south pole. These lines forms loops in order to favor the way which requires or has less resistance. Hope this helps.
what is meant by one watt power?
Answer:
one watt power is defined as power produced when one joule of work is done in one second.
hope it helps
stay safe healthy and happy
It’s IT but I really need the answer
The answer to the question is logic
A geostationary satellite orbits the Earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. How high above the Earth's surface must it be located?
Answer:
approximately 35,786 km
Explanation:
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level. It maintains the same position relative to the Earth's surface.
0.125 C of charge flow out of a
5.00 V battery in 6.30 s. How
much resistance is attached to the
battery?
(Hint: What is the definition of current?)
(Unit = Ohm)
Answer:
Resistance = 252.53 Ohms
Explanation:
Given the following data;
Charge = 0.125 C
Voltage = 5 V
Time = 6.3 seconds
To find the resistance;
First of all, we would determine the current flowing through the battery;
Quantity of charge, Q = current * time
0.125 = current * 6.3
Current = 0.125/6.3
Current = 0.0198 A
Next, we find the resistance;
Resistance = voltage/current
Resistance = 5/0.0198
Resistance = 252.53 Ohms
How would mass determine if an egg will crack or not and why?
Answer:
the force of the egg striking the floor or ground is greater than the force that the egg shell can exert on itself to keep its shape, the egg will break. Some eggs are stronger than others, depending on how thick the shell is.
Explanation:
credits :- http science line
Is water still part of the cycle when it is underground? Explain.
Answer:
hi
Explanation:
In a chemical reaction, the substances that interact are called the reactants.
A. True
B. False
Answer:
true
Explanation:
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products. In a chemical reaction, only the atoms present in the reactants can end up in the products.
A 15.0 kg box is hung from the ceiling by one rope. What is the tension on the rope?
Tension = Mass * Gravity
Tension = 15 * 9.81 = 147.15
What is a solute?
the liquid in a solution
the solid in a solution
the substance that gets dissolved
Answer:
C.) The substance that gets dissolved
Explanation:
Because i am a wise man
You push a heavy crate. At first it doesn't move. You push harder, and it finally starts to move, but you still have to exert some force to keep it moving at a constant velocity. Explain.
Answer:
Explained below.
Explanation:
Newton's first law of motion states that an object will continue in its present state of rest or continue with constant speed in a straight line except it is acted upon by an external force.
For every object in motion or at rest there is a force of friction that tries to resist its motion or prevent it from moving with constant velocity.
Now, to push it from rest you will need to apply a force large enough to overcome its static friction. Now, after that initial motion, smaller forces will have to be applied to overcome what is called sliding friction that prevents the crate from sliding which will affect the constant velocity.
what is atom.......... ?
Answer: the basic unit of a chemical element.
Explanation:
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
hope this helps
How can energy conservation be considered an energy source?
Answer:This could be in the form of using fewer energy services or using devices that require less energy.
Explanation:
Which path would the laser take when entering the water from air?
brown or black
What is SI unit of energy?
Answer:
the SI unir of enery is joule
A 480 Ω resistor is connected in series to a 360 Ω resistor and a 120-V power supply.
a. Draw the circuit.
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