Answer:
The temperature of the brakes is 29.38°C.
Explanation:
Given that,
Mass of car = 750 kg
Speed = 23 m/s
Mass of iron = 15 kg
We need to calculate the kinetic energy of car
Using formula of kinetic energy
We need to calculate the temperature of the brakes
Using formula of energy
Put the value into the formula
Hence, The temperature of the brakes is 29.38°C.
Answer:
B) True.
Explanation:
In this exercise to answer the statements we must calculate the force on the earth by the two bodies.
In both cases, the law of universal gravitation describes the process.
F = G m₁ m₂ / r²
Let's calculate each force
- bodies Moon - Earth
Let's call m₁ the mass of the earth (m₁ = me), m₂ the mass of the moon (m₂ = m), the distance from the earth to the moon is r₁ = 3.84 10⁸m and the radius of the earth is re. The force on the tide that is a body on the surface of the Earth have a distance
R₁ = r₁ -re
R₁ = 3.84 10⁸ - 6.37 10⁶
R₁ = 3.77 10⁸ m
Let's calculate
F₁ = G me m / R₁²
F₁ = (G me) 7.36 10²² / (3.77 10⁸)²
F₁ = (G me) 5.2 10⁵
- bodies Earth -Sun
Let's call the mass of the sun M (m2 = M) the distance from the sun to the earth is 1.5 10¹¹ m, so the distance to the surface of the earth
R₂ = r₂ - re
R₂ = 1.5 10¹¹ - 6.37 10⁶
R₂ = 1.5 10¹¹ m
The radius of the earth is too small compared to the earth-sun distance
Let's calculate
F₂ = G me M / R₂²
F₂ = (G me) 1.99 10³⁰ / (1.5 10¹¹)²
F₂ = (G me) 8.8 10⁷
Let's see the statements:
A) False. It´s oppsote
B) True. In the previous part it has a differentiated 10² orders of magnitude
C) False. We saw that they are very different
To my best knowledge the answer is D- Wavelength
The efficiency of the process is 42%
From the question given above, the following data were obtained:
Useful energy = 250 watt
Wasteful energy = 600 watt
<h3>Efficiency =? </h3>
The efficiency of the process can be obtained as illustrated below:
<h3>Efficiency = 42%</h3>
Therefore, the efficiency of the process is 42%
Learn more: brainly.com/question/2300041
Answer:
Radio Waves
Explanation:
Radio wave is a type of electromagnetic radiation notorious for their use in technologies used for communication like air traffic control, mobile phones, televisions and remote-controlled toys. Radio waves have the longest wavelength in the electromagnetic spectrum and are easily transmitted through air.
A radar gun uses radio waves to tell how far away an object is. To do that, the radar tool emits a focused radio wave and listens for any echo. If there is an item, say a car within the route of the radio wave, it's going to replicate some of the electromagnetic energy, and the radio wave will return to the radar gun. Radio waves flow via the air at a steady pace, so the radar gun can calculate how far the object is based totally on how long it takes the radio signal to return.
