All magnets possess a property called polarity--that is, a magnet's power of attraction is strongest at its opposite ends, usually called the north and south poles. The north and south poles attract each other, but north repels north and south repels south. All magnets attract iron.
Appproximately 10% of those who suffer from anorexia nervosa literally starve themselves to death.
Answer:
θ = 225 rad
Explanation:
given data
angle = 25 rad
to find out
angular velocity after 3t?
solution
let angular acceleration α in t
θ = ω × t + 0.5 × α × t² ........................1
here ω = 0 (initial velocity )
so put this value here
25 = 0 + 0.5 × α × t² ..........................2
α = 25 ÷ (0.5 t²)
α = 50 ÷ t² .........................3
now here we take in 3t
θ = ω × 3t + 0.5 × α × (3t)²
for ω = 0
θ = 0 + 0.5 × α × 9t²
now put value in eq 2
so
θ = (0.5) × (50 ÷ t²) × (3t)²
θ = 25 × 9
θ = 225 rad
Mass and gravitational field
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
