Why do chemical reactions always involve a change in energy?
The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system is known as its enthalpy.
what is the motion of a car
Answer: Assuming you are driving a car on the road, consider the motion of the car. As the wheels of the car spin backwards, they push the road backwards. In consequence, the road must push the wheels forward according to the third law of motion. It is this reaction force acting on the wheels causes the car to move forward.
Explanation: hope this helps!
what are insulators of electricity
Answer:
Rubber
Glass
Pure water
Oil
Air
Diamond
Dry wood
Dry cotton
Plastic
Asphalt
Other strong insulators include:
Fiberglass
Dry paper
Porcelain
Ceramics
Quartz
Explanation:
I hope this helps
Which statement describes how electrical power is calculated?
A. Power is the product of current and resistance.
B. Power equals current divided by voltage,
o
C. Power is the product of voltage and current.
D. Power equals voltage divided by current.
Answer:
C) Power is the product of voltage and current.
Explanation:
A.pex, hope this helps:)
Answer:
The answer is C. Power is the product of voltage and current
Explanation:
I am currently taking the test right now. This is on A P E X for me.
A cow standing atop a building in Times Square recalled a funny joke and began to laugh. The uncontrollable laughter caused the cow to fall over the side of the building. He fell for a time period of 3.5 s and landed in a bed of bushes. How fast was the cow moo-ving when he reached the bushes?
Which equation should be used to solve the problem?
Answer:
Vf = 34.3 m/s
1st equation of motion was used to solve.
Explanation:
In order to find the final speed of the cow, when it hits the bushes, we can use first equation of motion:
Vf = Vi + gt
where,
Vf = Final Velocity of Cow = ?
Vi = Initial Velocity of Cow = 0 m/s
g = acceleration due to gravity = 9.8 m/s²
t = time taken = 3.5 s
Therefore,
Vf = 0 m/s + (9.8 m/s²)(3.5 s)
Vf = 34.3 m/s
1st equation of motion was used to solve.
Which of the following yoga poses is a good pose to help you practice proper posture? A. Triangle pose B. Mountain pose C. Warrior II pose D. Seated Wide-leg saddle
Answer:B. Mountain Pose
Explanation:
6. Calculate Acceleration A person standing in a canoe
exerts a force of 700 N to throw an anchor over the
side. Find the acceleration of the canoe if the total
Applying Math
mass of the canoe and the person is 100 kg.
Answer:
force=700N
mass=100kg
acceleration =?
Now,
F=m×a
700=100×a
700÷100=a
7=a
acceleration =7m/s^2 answer!!!
hope this may help you !!!!
A sound wave is an example of a __________ wave. It requires a _________ to transfer energy.
Question 3 options:
medium, transverse
transverse, medium
longitudinal , medium
medium, longitudinal
Answer:
its A
Explanation:
A car was traveling at 45 m/s toward a traffic signal when the light suddenly changed from green to red. The driver slams on the brakes, stopping the car in 3.3 seconds. a. What is the acceleration of the car? b. How far did the car travel before it came to a stop
Answer:
Acceleration =13.63m/s^2
initial velocity = v = 45
final velocity = u = 0
acceleration = v-u/t
Match the letter to the appropriate name of the variable
Answer: yes
Explanation:
Monica walks from +21 m to - 46 m along a stretched-out tape measure.
What is her total DISTANCE traveled? Include units.
What is her total
DISPLACEMENT? Include units.
Answer:
67 meters (distance) +67 meters (displacement)
Explanation:
21 - (-46) meters
= 21 + 46 meters
= 67 meters
Hope this helped!
Answer:
67m
67m
both dist and displacement are the same oz it is on the same line
A car of mass 1470 kg is on an icy driveway
inclined at an angle of 40◦. The acceleration of gravity is 9.8 m.
If the incline is frictionless, what is the acceleration of the car Answer in units of m/s
Answer:
a = 7.5 m / s²
Explanation:
For this exercise let's use Newton's second law, let's create a coordinate system with the x axis parallel to the plane and the y axis perpendicular to the plane
Y axis
N - W cos θ = 0
N = mg cos θ
X axis
W sin θ = m a
mg sin θ = m a
a = g sin θ
let's calculate
a = 9.8 cos 40
a = 7.5 m / s²
Can any kind soul help me
Answer:
2917.4 m/s
Explanation:
From the question given above, the following data were:
Gravitational acceleration of the Moon (g) = 0.25 times the gravitational acceleration of the earth
Radius (r) of the Moon = 1737 Km
Escape velocity (v) =?
Next, we shall determine the gravitational acceleration of the Moon. This can be obtained as follow:
Gravitational acceleration of the earth = 9.8 m/s²
Gravitational acceleration of the Moon (g) = 0.25 times the gravitational acceleration of the earth
= 0.25 × 9.8 = 2.45 m/s²
Next, we shall convert 1737 Km to metres (m). This can be obtained as follow:
1 Km = 1000 m
Therefore,
1737 Km = 1737 Km × 1000 m / 1 Km
1737 Km = 1737000 m
Thus, 1737 Km is equivalent to 1737000 m
Finally, we shall determine the escape velocity of the rocket as shown below:
Gravitational acceleration of the Moon (g) = 2.45 m/s²
Radius (r) of the moon = 1737000 m
Escape velocity (v) =?
v = √2gr
v = √(2 × 2.45 × 1737000)
v = √8511300
v = 2917.4 m/s
Thus, the escape velocity is 2917.4 m/s
The total mechanical energy of a system is 950 J and the gravitational potential energy is 350 J. What is the kinetic energy?
Answer:
The kinetic energy is 600 J
Explanation:
Mechanical Energy
The principle of the conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as the only forces acting are conservative forces.
The mechanical energy is defined as the sum of the potential plus kinetic energies:
E = U + K
Where E is the total mechanical energy, U is the gravitational potential energy and K is the kinetic energy.
Solving for K:
K = E - U
The system described has a total mechanical energy of E=950 J and gravitational potential energy of U=350 J, thus:
K = 950 J - 350 J
K = 600 J
The kinetic energy is 600 J
a vector is 253 m long and points in a 55.8 degree direction, what’s the y and x- component of the vector?
Well we know the hypotenuse of the triangle which is 253 m. And we know the angle of the triangle which is 55.8 degrees. So we want to find y. And to find y we use sin. And sin is a ratio, the ratio of the opposite leg, and hypotenuse. So sin(55.8) = y/253. Now we solve for y by multiplying both sides by 253. And finally we get 209.25 as the length of the y component.
Rachel is feeling ill. Which symptom indicates that Rachel's illness is related to her ear and that she should consult a doctor? tooth sensitivity neck or jaw pain sensitivity to light loss of balance
Answer:
light loss of balance
Explanation:
it makes the person who is ill unstable
Light loss of balance symptom indicates that Rachel's illness is related to her ear and that she should consult a doctor.
What are the symptoms of illness related to ear?A physical or psychological issue that a person has that could be a sign of an illness or condition is known as symptom. Symptoms are invisible and do not appear on diagnostic tests.
symptoms of illness related to ear in child include:
ache in the ears, particularly when sleeping downgrabbing an ear or pulling itdifficulty sleeping excessive cryingFussinessdifficulty hearing or recognizing soundsloss of balancea fever of at least 100 F (38 C).fluid coming out of the earHeadachereduced appetiteAdults typically exhibit the following signs and symptoms in illness related to ear:
ear discomfortan ear infection fluid drainage hearing issuesLearn more about symptoms, refer the link:
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A ball is thrown horizontally at a height of 2.20 meters at a velocity of 65.0 m/s. Assume no air resistance. How far did the ball travel horizontally when it hit the ground?
If a ball is thrown horizontally at a height of 2.20 meters at a velocity of 65.0 m/s. Assuming no air resistance, then the distance traveled by the ball horizontally when it hit the ground would be 43.55 meters.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2 × a × t²
v² - u² = 2 × a × s
As given in the problem If a ball is thrown horizontally at a height of 2.20 meters at a velocity of 65.0 m/s. Assume no air resistance.
S = ut + 1/2 × a × t²
2.2 = 0 + 0.5 × 9.8 × t²
t² = 2.2 / 4.9
t = 0.67 seconds
The horizontal displacement of the ball = 0.67 × 65
= 43.55 meters
Thus, the distance traveled by the ball horizontally when it hit the ground would be 43.55 meters.
To learn more about equations of motion here, refer to the link given below ;
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You kick a soccer ball across a field the ball travels across the field and slowly comes to a stop. Since the ball slowly comes to a stop what does this mean about the net force on the ball as it rolls across the field?
Answer:
It slowly decreases and the friction acting on it slowing it down becomes the bigger net force, if that makes sense :)
Explanation:
If you kick a soccer ball across a field the ball travels across the field and slowly comes to a stop. Since the ball slowly comes to a stop, this means about the net force on the ball as it rolls across the field would decrease and finally would be less than the friction force.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum. The mathematical expression for Newton's second law is as follows
As given in the problem if you kick a soccer ball across a field the ball travels across the field and slowly comes to a stop. Since the ball slowly comes to a stop.
Since the ball stops gradually, this implies that the net force exerted on it as it rolls over the field will eventually diminish until it is less than the friction force.
Learn more about Newton's second law here, refer to the link given below ;
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At the top of a projectile's path above Earth, the acceleration of an object
Answer: At the top of a projectile's path above earth, the acceleration of an object. Compared to the range of a bullet shot horizontally, a bullet shot at a 30 degree angle.
Explanation: I hope that helped!
3/50
How many joules of energy does a 100-watt light bulb use per hour? How fast would a 70-kg person have to run to have that amount of kinetic energy?
A
360000.J. 101 m/s
B
320000 J 130 m/s
C
380000 J 120. m/s
340000 J. 140 m/s
Answer:
in the statement of account very seriously
Suppose the mass of the object below was to double. What would happen to the force needed to accelerate the object 10 m/s2?
Answer:
It would also double
Explanation:
F (force) = mass * acceleration; twice the mass means double tue force needed
Find the momentum of a 23.1 g bullet fired at 621 m/s.
a. 1.43×104 Ns
b. 26.9Ns
c. 2.69×10–2Ns
d. 14.3Ns
Answer:
d. 14.3 Ns
Explanation:
Mass of the bullet (m) = 23.1 g = 0.0231 kg
Speed of the bullet (v) = 621 m/s
Momentum (p) is measured as the product of mass of the body and it's speed.
Mathematical Representation/Equation of Momentum:
[tex] \boxed{ \bf{p = mv}} [/tex]
By using equation of momentum, we get:
[tex]\rm \longrightarrow p = 0.0231 \times 621 \\ \\ \rm \longrightarrow p = 14.3 \: kg \: m {s}^{ - 1} \\ \\ \rm \longrightarrow p = 14.3 \: Ns[/tex]
The momentum of a 23.1g bullet fired at 621 m/s is 14.3Ns.
HOW TO CALCULATE MOMENTUM:
Momentum is a product of an object's mass and velocity. That is, it can be calculated as follows:Momentum (p) = mass (m) × velocity (v)According to this question, a 23.1g bullet is fired at 621m/s. The momentum can be calculated thus:Mass of bullet in kg = 23.1/1000 = 0.00231kgMomentum (p) = 0.00231kg × 621m/sMomentum = 14.34NsTherefore, the momentum of a 23.1g bullet fired at 621 m/s is 14.3Ns.Learn more about momentum at: https://brainly.com/question/20301772?referrer=searchResults
Please view image attached!
Answer:
you would expect a change in the graph
Explanation:
Write the expression for the moment of force about a given axis of rotation.
Answer:
hope it helps..
Explanation:
Moment of force about a given axis= Force x perpendicular distance of force from the axis of rotation.
Explanation:
Moment of force about a given axis= Force x perpendicular distance of force from the axis of rotation.
3. A traffic light has a total resistance of 22 kN and requires 10 mA of current to
operate. What is the voltage required to operate the traffic light?
Given: Resistance (R) = ____ KΩ × (1 000 Ω/1 K Ω) = ____ Ω
Current (I) = ____ mA × (1 A/ 1000 mA) = ____ A
Required: Voltage(V)
Solution: V = IR
V = (____ A) (____ Ω)
Answer: Voltage = ____ volt
I REALY NEED THE ANSWER
Answer:
V = 220 [V]
Explanation:
In order to solve this problem we simply need to replace the given values of current and resistance in the expressions proposed.
R = 22 [kΩ] = 22000 [Ω]
I = 10 [mA] = 0.01 [A]
Voltage (V)
[tex]V = 0.01*22000\\V = 220 [V]\\[/tex]
can you please help me!!!
Answer:
needle
Explanation:
1. The unit of power is called a derived unit, why?
Answer:
Because its depends upon fundamental units and formed by combination of two or more fundamental units.
in a star nuclear fusion occurs in the
A. corona
b. photosphere
c. core
d. radiative zone
Answer:
C. Core
Explanation:
Just wondering, what do you guys think the 5th dimension is? I've always believed it to be light.
Answer: In the 5th dimension, they who claim to know, say that there is only one time, including the past and the future.
5. A small remote-controlled race car has a mass of 150 grams. If the car starting from rest can
reach its maximum velocity of 24 m/s in 4 seconds. What is the force of the race car's motor? (5
pts)
Answer:
0.9 N.
Explanation:
Mass (m) of car = 150 g
Initial velocity (u) = 0 m/s
Final velocity (v) = 24 m/s
Time (t) = 4 s
Next, we shall determine the acceleration of the car. This can be obtained as follow:
Initial velocity (u) = 0 m/s
Final velocity (v) = 24 m/s
Time (t) = 4 s
Acceleration (a) =?
v = u + at
24 = 0 + (a × 4)
24 = 0 + 4a
24 = 4a
Divide both side by 4
a = 24 /4
a = 6 m/s²
Thus, the acceleration of the car is 6 m/s²
Next, we shall convert 150 g to Kg. This can be obtained as follow:
1000 g = 1 kg
Therefore,
150 g = 150 g × 1 Kg / 1000 g
150 g = 0.15 Kg
Thus, 150 g is equivalent to 0.15 Kg
Finally, we shall determine the force of the car as follow:
Mass (m) of car = 0.15 Kg
Acceleration (a) of car = 6 m/s²
Force (F) of car =?
F = m × a
F = 0.15 × 6
F = 0.9 N
Therefore, the force of the car is 0.9 N.
what was the rule of the sticks on each atom model
Answer:
That they must die
Explanation:
Stick = Die