Answer:
To calculate how many joules of kinetic energy an electric car can have using the 250 joules of stored chemical energy from the battery, you'll need to consider the efficiency of the energy conversion from chemical to kinetic energy. Electric cars are not 100% efficient in converting stored energy to kinetic energy due to losses in the system, including in the motor, transmission, and drivetrain.
Let's say the efficiency of the conversion is "η," where η is a value between 0 and 1 (e.g., 0.85 for 85% efficiency). The kinetic energy (KE) the car can have will be:
KE = η * 250 joules
You can calculate the kinetic energy for different efficiency values by substituting η into the formula.
For example, if the efficiency is 85%:
KE = 0.85 * 250 joules = 212.5 joules
So, with an 85% efficiency, the electric car can have approximately 212.5 joules of kinetic energy from the 250 joules of stored chemical energy in the battery. The actual efficiency may vary depending on the specific car and its components.
Answer:
The kinetic energy K of the moving charge is K = 2kQ²/3d = 2Q²/(4πε)3d = Q²/6πεd
Explanation:
The potential energy due to two charges q₁ and q₂ at a distance d from each other is given by U = kq₁q₂/r.
Now, for the two charges q₁ = q₂ = Q separated by a distance d, the initial potential energy is U₁ = kQ²/d. The initial kinetic energy of the system K₁ = 0 since there is no motion of the charges initially. When the moving charge is at a distance of r = 3d, the potential energy of the system is U₂ = kQ²/3d and the kinetic energy is K₂.
From the law of conservation of energy, U₁ + K₁ = U₂ + K₂
So, kQ²/d + 0 = kQ²/3d + K
K₂ = kQ²/d - kQ²/3d = 2kQ²/3d
So, the kinetic energy K₂ of the moving charge is K₂ = 2kQ²/3d = 2Q²/(4πε)3d = Q²/6πεd
B. rises toward the ceiling.
C. transfers heat to the walls.
D. sinks toward the floor.
Answer:
choice B
Explanation:i took the test
Answer:
ITS D
Explanation:
if its wrong i will comeback and re do it
Reactivate
B) a glow stick
C) photosynthesis
D) a hydroelectric dam
The question involves the concepts of chemical energy, light energy and energy conversion.
The example which involves the transformation of chemical energy directly into light energy is "B) a glow stick".
A)
In a windmill, the input energy is the wind energy, and that wind energy is then converted to mechanical energy when the rotor blades rotatae. That mechanical energy is then converted to electrical energy. This electrical energy is then used in lamps to get light energy. Hence, the chemcial energy is not directly transformed into light energy in the windmill.
B)
A glow stick uses the chemical energy from the chemicals inside it to produce luminance in the form of light energy. When the stick is bent or broken, it releases the chemicals inside it which undergo a chemical reaction that leads to the conversion of chemical energy into light energy.
C)
During photosynthesis, light energy is used by plants to produce oxygen and energy in the form of sugar (glucose).
D)
A hydroelectric dam receives mechanical energy from water. The gravitational potential energy of water due to its height is converted into kinetic energy when it reaches the turbine. This kinetic energy is then converted to electrical energy.
Hence, the only example where chemical energy is directly converted to light energy is Glow Stick.
Learn more about energy conversion here:
brainly.com/question/11234965?referrer=searchResults
The attached picture shows different energy conversions.
Answer:
i dont understand sorry
Compared to the sound waves detected by the
driver of the truck, the sound waves detected by
the observer have a greater
(1) wavelength (3) period
(2) frequency (4) speed
Answer: The correct option is (2).
Explanation:
Doppler effect is the phenomenon in which the frequency of the wave increase or decrease when there is relative motion between the source and the listener. There is an apparent change in the frequency.
When the source and the listener are approaching each other then there will be increase in the frequency.
When the source and the listener are moving away form each other then there will be decrease in the frequency.
In the given problem, Sound waves are produced by the horn of a truck
that is approaching a stationary observer. The sound waves detected by the observer have greater frequency.
Therefore, the correct option is (2).