Answer:
Explanation:
Stefan's Boltzman Law gives the value of radiation from a black body at a particular temperature. The relation is
E = eσ ( T₂⁴ -T₁⁴ )
e is emmisivity , σ is a constant = 5.67 x 10⁻⁸ , E is energy emitted per unit time per unit area
E = .915 x 5.67 x 10⁻⁸ x ( 303⁴ -293⁴ )
= .915 x 5.67 x 10⁻⁸ x ( 84.28 -73.70 ) x 10⁸
= 55 W / m²s
Area A = 1.45 m²
time t = 14.3 min
= 858 s
Total radiation
= 55 x 858 x 1.45 W
= 68425 J
Answer:
(C) speed = 40 m/s, distance = 80 m
Explanation:
According to Newton law of motion for a falling body:
v = u + gt
Where v is the final velocity, u is the initial velocity, t is the time taken to fall and g is the acceleration due to gravity.
Given that: t = 4 s, g = 10 m/s², u = 0 m/s(at top of building). Therefore substituting values:
v = 0 + 10(4)
v = 40 m/s
To find the distance h, we use the formula:
v² = u² + 2gh
Substituting values:
40² = 0² + 2(10)h
20h = 40² - 0²
20h = 1600
h = 1600 / 20
h = 80 m
The speed = 40 m/s, distance = 80 m
Yes, young people have that ability. However, many of them do not use their ability wisely, and instead of contributing to their community, they only take.
hope this helps
She need to release the cluch slowly and apply force on the accelator other than place her vehicle's gear in Drive and accelerate
<h3>How we drive a car?</h3>
We drive a car by applying pressure on the accelator, remove foot from the brakes and releasing cluch slowly. When the vehicle get speed, we have to change the gear.
So we can conclude that She need to release the cluch slowly and apply force on the accelator for driving a car.
Learn more about accelaration here: brainly.com/question/605631
