Answer: 2a- 0.4167s
Explanation:
Given: distance= 5m, speed= 12m/s
Unknown: time
Equation: t= d/s
Substitution: t=5/12
t=0.4167s
Answer:
Explanation:
12000 mega watts = 12000 x 10⁶ watt.
rate of energy conversion is only 10 % so solar power required
= 12000 x 10⁶ x 100 / 10
= 12 x 10¹⁰ watt .
one square meter provides 169 watts
area required to obtain 12 x 10¹⁰ watt = 12 x 10¹⁰ / 169 m²
= .071 x 10¹⁰ m²
= 71 x 10⁷ m² . Ans.
The acceleration due to gravity on planet Alpha is B) 8.0 m/s2
Explanation:
The weight of a body is given by:
where
m is the mass of the body
g is the acceleration of gravity at the location of the body
In this problem, we have:
m = 70 kg is the mass of the astronaut
W = 560 N is the weight of the astronaut on the surface of planet Alpha
Therefore, we can re-arrange the equation to find g, the acceleration of gravity on the planet:
Learn more about weight and forces here:
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Answer:
F = 5.33 10⁻⁶ N , directed to the left
Explanation:
For this exercise we will use the force addition law where each force is electric given by Coulomb's law
F = ∑ F
F = F₁₃ + F₂₃
where the force is given by
F = k q₁ q₂ / r₁₂²
in our case
F₁₃ = k q₁ q₃ / r₁₃²
F₂₃ = k q₂ q₃ / r₂₃²
F = k q₃ (q₁ / r₁₃² + q₂ / r₂₃²)
as the charges are of the same sign the electric force is repulsive and due to the position of the charges it is directed to the left
let's calculate
F = 9 10⁹ 8 10⁻⁹ (3 10⁻⁹ / (0.26 - 0) 2 + 6 10⁻⁹ / (0.45-0) 2)
F = 72 (44,379 + 29,630) 10⁻⁹
F = 5.33 10⁻⁶ N
directed to the left
Answer:
d) An object that is speeding up always has a positive acceleration, regardless of the direction it travels.
Explanation:
a ) a) An object that is slowing down while traveling in the negative x-direction always has a positive acceleration.
It has negative acceleration in the negative x-direction.
b) An object that is speeding up while traveling in the negative x-direction always has a positive acceleration.
It has a positive acceleration in the negative x-direction'
c) An object that is slowing down always has a negative acceleration, regardless of the direction it travels.
It has a positive acceleration in opposite direction.
e ) An object that is slowing down always has a positive acceleration, regardless of the direction it travels.
It has a positive acceleration only in opposite direction .