(15.9 - 15.6) / 15.9 × 100% (because the actual weight is 15.9)
1.8868% = 1.89%
Answer: D
Hope it helped!
The answer to this question is letter "B" Color is the best way to identify a mineral. According to the source, Rose quartz are pink while smoky quarts are gray and it cannot only identify minerals but impurities can be changed.
Answer:
Explanation:
We apply Newton's second law:
∑F = m*a (Formula 1)
∑F : algebraic sum of the forces in Newton (N)
m : mass in kilograms (kg)
a : acceleration in meters over second square (m/s²)
Problem development
M1 free body diagram : Look at the attached graphic
∑F = m₁*a
W₁ -T= m₁*a
W₁ - m₁*a = T Equation 1
M2 free body diagram :Look at the attached graphic
∑F = m₂*a
T-W₂= m₂*a
W₂ + m₂*a = T Equation 2
Equation 1 = Equation 2
W₁ - m₁*a = W₂ + m₂*a
W₁ - W₂ = m₁*a + m₂*a
m₁*g -m₂*g = a* (m₁ + m₂)
a = (m₁*g -m₂*g) / (m₁ + m₂)
Calculation of the tension in the rope (T)
We replace a in the equation 2
W₂ + m₂*a = T
W₂ + m₂*g*(m₁ -m₂) / (m₁ + m₂) = T
m₂*g + m₂*g*(m₁ -m₂) / (m₁ + m₂) = T
m₂*g( (1+ (m₁ -m₂)) / (m₁ + m₂) = T
m₂*g (1+m₁ -m₂) / (m₁ + m₂) = T
Answer:
34.6 m/s
Explanation:
Since there are no external forces acting on the system, the total momentum of the kids+sled system must be conserved, so we can write:
where:
is the mass of kid A
is the mass of kid B
is the mass of kid C
u = 19.8 m/s is the initial velocity of the system
v is the final velocity of the system, after kid A jumped off it
Here we have ignored the mass of the sled since it is not given.
Therefore, by solving the equation for v, we find the new velocity of the sled: