Answer:
942.75J
Explanation:
Change in thermal energy is equal to the mass of the given substance times the specific heat capacity times the temperature change.
We've already been given the specific heat capacity, the mass as well as the initial and final temperatures.
So change in temperature will be 35° - 20° = 15°
Thermal energy change = 15 × 15 × 4.19
The final answer is 942.75J
Hope that helped.
A car is pushed with a force of 450 N for 19.4 seconds. What impulse was applied to the car?
Answer:
impulse = 8820 kg·[tex]\frac{m}{s}[/tex] or 8820 N·s
Explanation:
Impulse J is equal to the average force [tex]F_{av}[/tex] multiplied by the elapsed time Δt or in equation form, J = [tex]F_{av}[/tex]Δt
As long as your force of 450 N is constant then that value is your average force [tex]F_{av}[/tex] and your elapsed time is 19.4 seconds.
Multiply these values.
You will get an impulse of 8820 kg·[tex]\frac{m}{s}[/tex] or 8820 N·s.
A friend of yours is wearing a green shirt. Why is their shirt green?
Q1. That is, what gives the shirt the green color that you perceive when you look at it?
Q2. Now, if your friend walked into a totally dark room, what color would the shirt appear?
Explain.
1. A claim (one sentence stating what you know)
2. 3 pieces of evidence
3. Reasoning
Answer:
The answer is the shirt would disappear because I would eat him
A force of 900 N pushes a wedge 0.10 m into a log. If the work done on the log is 50 J, what is the efficiency of the wedge?
Answer:
I'm fairly certain it's 1,800
Explanation:
The efficiency of the wedge with force F=900 N displaces the wedge 0.10 m is 55.55% or 56%.
What is the efficiency of the machine?The efficiency of the machine equals the ratio of output energy and input energy. It is also defined as the ratio of work done on a load by the machine to the work done on the effort by the machine.
A load is defined as the weight lifted by the machine. The effort is defined as the force applied to bring the desired change in the load. Work done is defined as the product of force and displacement.
The efficiency, η = Output power / Input power, and the highest efficiency of the machine is equal to one. The efficiency of the machine has no unit. The efficiency η = (Actual work done / Ideal work done) × 100.
From the given,
Force = 900 N
Displacement = 0.1 m
Work done = F × s = 900×0.1 = 90 J
Actual work done = 50 J
Efficiency,η = (50/90) × 100
η = 55.55 %
Thus, the efficiency of the wedge is 55.56%.
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A car accelerates in the +x direction from rest with a constant acceleration of a1 = 1.51 m/s2 for t1 = 20 s. At that point the driver notices a tree limb that has fallen on the road and brakes hard for t2 = 5 s with a constant acceleration of a2 = -5.03 m/s2. Write an expression for the car's speed just before braking.
Answer:
v = 1.51t and v = 30.2 m/s just before braking
Explanation:
Using v = u + at where u = initial velocity of car = 0 m/s (since it starts from rest), a = a1 = acceleration before braking = 1.51 m/s², t = t1 = time before braking = 20s and v = speed of car before braking.
Substituting the values of the variables into the equation, we have
v = u + at
v = 0 m/s + 1.51 m/s²t
v = 1.51t and its value after 20 s is
v = 1.51 × 20
v = 30.2 m/s which is the value just before braking.
Whoever could answer this I would make Brainliest
Answer:
1. D
2. C
3. A
4. B
5. E
I dreamt about u last night. It didnt end well. U DIED................
D, C, A, B, E
what must be true the number of chromosomes in each sex cell
Answer:
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46.
Which of the following best describes what displacement is?
o displacement is a vector, it must have magnitude only
o displacement is a scalar, it must have magnitude and direction
o displacement is a scalar, it must have magnitude only
o displacement is a vector, it must have magnitude and direction
what is the work done when a 400.n force is use to lift a 400.n object 3.5 meters strait up
Answer:
i think it's 1400
Explanation:
w = Force x displacement
w = 400 x 3.5
Help in physics please. Need asap :(((
Answer:
which class you are studying hear the everything is based on the tangent line I didn't even handle this I am sorry
How does a winter jacket keep you warm while a cold winter day and Why .
Please help me
In colder weather, people usually wear coats when going outside. Coats keep us warm because of the material of the coat. Our body supplies the heat, and the material helps to trap body heat and keeps the heat from escaping into the air. This is what keeps us warm.
Insert the values
A train is traveling at a speed of 100km/hr for 3 hours. It then speeds up to 2 poin
150km/hr for the next 2 hours. How far has the train gone at the end of 5hours
Answer:
300km
Explanation:
To find the total distance traveled within the given time frame, we need to known that distance is the product speed and time;
Distance = Speed x time
For the first lap:
Distance = 100km/hr x 3hr = 300km
For the second lap;
Distance = 150km/hr x 2 = 300km
Distance = 300km + 300km
So;
Distance = 300km
Place the following into scientific notation...(.000635)
*
Ranjana has average velocity 3.2 m/s
How long does she take to cover a displacement
of 256 m
Answer:
t= 80 seonds
Explanation:
Given that,
The average velocity of Ranjana, v = 3.2 m/s
We need to find how long does she take to cover a displacement of 256 m. Let she takes t time.
We know that,
Average speed = distance/time
So,
[tex]t=\dfrac{d}{v}\\\\t=\dfrac{256\ m}{3.2\ m/s}\\\\t=80\ s[/tex]
So, she will take 80 seconds to cover a displacement of 256 m.
what are some ways to increase gravitational potential energy?
Answer:
Increase height
Increase mass
You get out of school and walk north for 20 minutes. You travel
1.6 km. What is your average velocity?
What is the
Answer:
[tex]\boxed {\boxed {\sf v= 0.08 \ km/min \ North}}[/tex]
Explanation:
Velocity is found by dividing the displacement by the time.
[tex]v=\frac{s}{t}[/tex]
where s is the displacement and t is the time.
The displacement is 1.6 kilometers, but it needs a direction as well. The question notes you walked North. The time is 20 minutes.
[tex]s= 1.6 \ km \ North \\t= 20 \ min[/tex]
[tex]v=\frac{1.6 \ km \ North} { 20 \ min}[/tex]
Divide.
[tex]v= 0.08 \ km/min \ North[/tex]
Velocity is a vector quantity, so that is why it has the measurement and the direction.
The average velocity is 0.08 kilometers per minute North.
Answer:
Are there no moderators here?
Who are moderators here?
Well, the above answer is correct..
✨
Speed and velocity use the same formula for calculations. However, an object can have a different average speed and average velocity because of
displacement
True
False
Answer:
true..........................
Speed and velocity use the same formula for calculations. However, an object can have a different average speed and average velocity because of displacement. This is true statement.
What are velocity and speed?As a vector quantity with both magnitude and direction, velocity has both. This term refers to the speed at which an object is moving or shifting positions.
Since speed is a scalar quantity, it lacks direction. It indicates the rate of a moving thing. When a particle's speed is high, it indicates that it is travelling quickly, and when it is low, it indicates that it is going slowly.
The displacement of a body during a period of time divided by the passage of time yields the average velocity of the body during that period.
The distance travelled by a body in a given amount of time, divided by the amount of time, is the body's average speed.
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Se usa una bombona de He para inflar globos, de volumen 15L con una presión de 200 atm. Si los globos tienen un volumen de 1.5L y presión de 770mmHg. ¿Cuántos globos se pueden llenar?
Answer:
La cantidad de globos llenos es de aproximadamente 1.974 globos
Explanation:
Los parámetros dados son;
El gas utilizado para inflar el globo = Él
El volumen del gas He, V₁ = 15 L
La presión del gas He, P₁ = 200 atm = 20,265,000 Pa
El volumen de cada globo = 1,5 L
La presión del He dentro del globo, P₂ = 770 mmHg = 102,641 Pa
Sea 'V₂', que represente el volumen total que el gas ocupa en todos los globos, y 'x', que represente el número de globos;
Por lo tanto, tenemos;
1,5 · x = V₂
Según la ley de Boyle, tenemos;
P₁ · V₁ = P₂ · V₂
∴ V₂ = P₁ · V₁ / (P₂)
Al introducir los valores conocidos, obtenemos;
V₂ = 20,265,000 Pa × 15 L / (102,641 Pa) = 2,961.53548 L
1,5 L × x = V₂
∴ 1,5 L × x = 2,961,53548 L
x = 2,961.53548 L / (1.5 L) = 1,974.35699 redondeamos hacia abajo para obtener un número entero de globos de la siguiente manera;
El número de globos, x ≈ 1,974 globos.
What is the velocity of a wave with a frequency of 300 Hz and a wavelength of 0.45 m?
Answer:
velocity= 135m/s
Explanation:
velocity = 300×0.45
= 135m/s²
What was Manifest Destiny? How did the Mexican-American War contribute to this ideal?
Answer:
By the end of the war, Mexico would lose almost half its territory to the U.S., including lands from Texas to California. The war was a key event in American History as it fulfilled its 'manifest destiny', encompassing land from the Atlantic Ocean to the Pacific.
Explanation:
How far will a force of 6 x 10^3N stretch a spring with spring constant 3 x 10^4 Nm-1 ?
Answer:
0.2m
Explanation:
F = 6 x 10^3N
k = 3 x 10^4 Nm-1
x = ?
from Hooke's law, F = kx
x = F/k = 6 x 10^3 ÷ 3 x 10^4 = 0.2m
A horse pulls a carriage by applying 450 N of force. Find the traveled distance if the horse did 89 kJ of work.
Answer:
distance = 197.8 m
Explanation:
Use the formula for work as the force times the distance the force was acting on the object.
W = F * d
89000 J = 450 N * d
d = 89000/450 m
d = 197.8 m
in a series connection of bulbs,if one bulb fails.why do all other bulbs go off
Answer:
Because in series, current flow through a single path only as it is same. Hence,if one fails the entire circuit breaks and other bulbs are switched off.
Explanation:
A student pushes a 50-N box across the floor a distance of 15 m. How much work was done to move the box?
1) 750 j
2) 75 J
3) no work was done
4) 7500 J
Answer:750
Explanation:
50 times 15
Answer:
750 j
Explanation:
I took the test in k12
This strand of evidence helped to provide a link in the evolution of whales from land mammals on 4 legs to a sea mammal with fins
A. Embryology
B Fossils
C. Natural Selection
D. DNA
Answer:
D. DNA
Explanation:
Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants.
Heredity refers to the transfer of traits (specific characteristics) from the parent of a living organism to her offspring through sexual reproduction or asexual production. Some examples of hereditary traits are dimples, tongue rolling, baldness, handedness, freckles, curly hair, color blindness, height, etc.
Deoxyribonucleic acid (DNA) is a strand of evidence which helped to provide a link in the evolution of whales from land mammals on 4 legs to a sea mammal with fins.
Basically, deoxyribonucleic acid (DNA) is an organic complex-molecular structure found in all living organisms. It comprises of genes and is essentially the foundation block of all living organisms such as humans, animals and plants.
An object is placed 1.0 cm from a convex mirror with a focal length of 4.0 cm.
Answer:
image distanc=-0.8cm
Explanation:
.8 is the answer, sorry I do not have the proof.
But the other guy DOES NOT know how to write.
Reading the temperature of a solution by using a thermometer is an example
of a(n)
O A. hypothesis
OB. observation
O C. inference
OD. conclusion
[WASSCE June 2008 Qu 11]
[
A force of 20 N acts at an angle of 30° to the
horizontal. Determine the vertical component
of the force.
A. 17.30 N
B. 11.50 N
C. 10.00 N
D. 7.50 N
[WASSCE Nov 2008 Qu 11
α=30°
F=20 N
Fh=F*cos(α)
Fv=F*cos(90-α)=F*sin(α) (vertical component of the force F)
Fv=20*0,5=10.00 N
Answer (C)
Which method of popcorn popping transfers heat into the kernels without any direct
contact (nothing hot touched the kernels)? Explain.
Which method of popcorn popping requires the kernels to move through the heat source
in order to pop. Explain.
Describe another example of an object being heated through conduction.
Answer:
you plug in and turn on the popper, and then the hot air begins to rise in the popper while cooler air falls. As hot air circulates past the popcorn kernels and so the kernels absorb the hear
Three forces are acting on an object as shown in the diagram. The object is not moving. Two forces are to newtons and 10 N. Third force is:
The object is not moving, so the net force acting on it is zero.
The two given forces act in the same direction with a total magnitude of 2 N + 10 N = 12 N.
The third force acts counter to these with some magnitude F to give a net force of 0, so that by Newton's second law
F = 12 N
As altitude increases in the troposphere and stratosphere, the air temperature does what?
A. decreases in the troposphere and increases in the stratosphere.
B. Decreases in both places.
C. Increases in the troposphere and decreases in the stratosphere.
D. Increases in both places
Answer:
1
Explanation:
The correct answer is decreases in the troposphere and increases in the stratosphere.
How does altitude affect the troposphere?For this reason, the density of gases decreases as the distance from Earth's surface increases. Put another way, air pressure (i.e., density) decreases as altitude increases.
How can altitude affect the temperature of a place?The temperature of a place decreases with increasing altitude from the earth's surface.
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