Answer:
The mass of the feather would be 0.0075 kg.
Explanation:
If the feather were to be on earth, it would have experienced the gravitational pull of the earth downwards. So that from Newton's second law of motion,
F = mg
where f is the force on the object, m is the mass of the object and g is the acceleration due to gravity of the earth.
But, F = 0.075 N, g = 10 m/.
So that,
0.075 = m x 10
m =
= 0.0075 kg
The mass of the feather would be 0.0075 kg.
-- If there are only <em>10</em> elements in the universe that can make compound molecules, and a compound molecule can be formed by combining 1, 2, 3, or 4 different elements, then that's already the possibility of at least 400 different molecules.
-- There are many more than 10 elements that can combine to form compound molecules.
-- Every single "<em>organic</em>" molecule, of which there are thousands, is the combination of <em>carbon</em> with other elements.
-- Most all of the substances that can be distilled out of oil, including the paraffin waxes, the alcohols, gasoline, kerosene, butane, propane, octane, and natural gas, are made of just carbon, hydrogen, and oxygen, only with different numbers of each one.
-- Plastics, drugs, rubber, and DNA are examples of molecules that are made of <em>hundreds</em> of atoms.
Answer:
tmax = 1.11 s, d = 35.98 m
Explanation:
Here is the complete question
Water leaves a fireman's hose (held near the ground) with an initial velocity
v
0
=
19.5 m/s at an angle θ
= 34 degrees above the horizontal. Assume the water acts as a projectile that moves without air resistance. Use a Cartesian coordinate system with the origin at the hose nozzle position.
Using v
0
,
θ
,
and g, write an expression for the time, t max, the water travels to reach its maximum vertical height. At what horizontal distance d from the building base, should the fireman place the hose for the water to reach its maximum height as it strikes the building? Express this distance, d, in terms of v
0
,
θ
,
and g.
Solution
Since the water leaving the hose is considered to be a projectile motion with initial velocity,v₀ = 19.5 m/s and an angle θ = 34. The time tmax it takes the water to reach maximum height is given by
tmax = v₀sin
θ/g = 19.5 × sin34/9.8 = 19.5 × 0.5592/9.8 = 10.904/9.8 = 1.113 s ≅ 1.11 s
The horizontal distance,d from the base of the building at which the hose must be placed to reach maximum height is the range of the projectile and is given by
d = v₀²sin2θ/g = 19.5²sin(2×34)/9.8 = 19.5²sin68/9.8 = 380.25 × 0.9272/9.8 = 352.562/9.8 = 35.98 m
Answer:
A ratio is a way to compare quantities of things.
Explanation:
by dividing the number of moles of each by the smallest number of moles.