Is earth’s freshwater
Only about 3 percent of Earth’s water is fresh water.
Answer:
The answer is 30 degrees.
Explanation:
The angle between the index and pinky fingers is 15 degrees.
Twice this angle is 2×15=30degrees.
Answer:
A
Explanation:
The distance between the water molecules increases. As temperature increases the water molecules gain energy and move more rapidly and this results in the molecules getting further apart
Answer:
12 kg
Explanation:
Momentum before collision = momentum after collision
m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂
After the collision, they have the same velocity, so v₁ = v₂ = v:
m₁ u₁ + m₂ u₂ = m₁ v + m₂ v
m₁ u₁ + m₂ u₂ = (m₁ + m₂) v
We know that m₁ = 6 kg, u₂ = 0 m/s, and v = u₁ / 3.
(6 kg) u₁ + m₂ (0 m/s) = (6 kg + m₂) (u₁ / 3)
(6 kg) u₁ = (6 kg + m₂) (u₁ / 3)
6 kg = (6 kg + m₂) (1/3)
18 kg = 6 kg + m₂
m₂ = 12 kg
Answer:
Mass of the object is 20 kg.
Explanation:
Formula to calculate the gravitational potential energy is,
P.E. = mgΔh
m = mass of the object
g = acceleration due to gravity = 9.8 meter per square second
Δh = Height of object from the ground
By substituting the values in the formula,
833 = m × 9.8 × 4.25
m =
= 20 kg
Therefore, mass of the object is 20 kg.