Answer:
Explanation:
Mass of station wagon M = 1200 kg , velocity V = 12 m/s
Mass of car m = 1800 kg , velocity v = 20 m/s
a ) Let centre of mass of car and station wagon be at a distance d from wagon
Taking moment of weight about it
1200 x d = 1800 x ( 40 - d )
3000 x d = 1800 x 40
d = 24 m
b ) Total momentum = MV +mv
= 1200 x 12 + 1800 x 20
= 50400 kg ms⁻¹
c ) Speed of centre of mass
v₀ = (MV + mv )/(m+M)
= 50400/3000
= 16.8 m/s
d) System Total momentum = velocity of cm x total mass
= 16.8 x 3000 = 50400 m/s .
It is equal to what was calculated in part b)
Answer:
i. 0.34
ii. 0.4
iii. 1700 w/m²
iv. 2211.36 w/m²
Explanation:
Given that
Irradiation of the plate, G = 2500 w/m²
Reflected rays, p = 500 w/m²
Emissive power, E = 1200 w/m²
See attachment for calculations
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
tinyurl.com/wtjfavyw
Earth's tilt is closest to 23.5<span>°. (C)</span>
Finding out the acceleration 12/3 = 4m/s^2
thus it is descending so the actual acceleration would be 9.8-4 = 5.8 m/s^2
the weight will be 90*5.8 = 522 N
522/9.8 = 53.2 kg