Physics, 13.10.2019 03:30 idontknow113

If you launch a bottle rocket into the sky with initial velocity 100m/s, how long will it take to come back to the launch height? ignore wind /air resistance

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Answer from: shayyy49

$\large \boxed{\text{20.4 s}}$

Explanation:

I assume the rocket is going straight up. Then we need to deal only with the vertical direction.

Start with the equation

$v = v_{0} + at$

At t = 0, v₀ = 100 m/s.

At time t, at the height of the trajectory, v = 0.

a = g = -9.807 m·s⁻²

$\begin{array}{rcl}0 & = & 100 - 9.807t \\-100& = &-9.807t\\t & = & \dfrac{100}{9.807}\\\\& = & \text{10.20 s}\\\end{array}$

This is the time it takes to reach maximum height.

It will take the same time to reach the ground.

Thus,

Time of flight = 2t = 2 × 10.20 s = 20.4 s

$\text{It will take $\large \boxed{\textbf{20.4 s}}$ for the rocket to return to the launch level.}$

If you launch a bottle rocket into the sky with initial velocity 100m/s, how long will it take to co

Answer from: Quest

1.the balanced chemical equation is as below

cu + 2 ag(no)₃ → cu(no₃)₂ +2 ag

2.the much silver produced is 50.9 g

step 1: find the moles of cu

moles = mass÷ molar mass

from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236 moles

step 2: use the mole ratio to determine the moles of ag

from equation above cu: ag is 1: 2

therefore the moles of ag =0.236 moles x 2/1 =0.472 moles

step 3: find the mass of ag

mass = moles x molar mass

from periodic table the molar mass of ag =107.87 g/mol

mass = 0.472 moles x 107.87 g/mol = 50.9 g

3. the much silver collected worth is 1.797 oz

convert 50.9 g to oz

that is 1 gram = 0.0353 oz

50.9 grams =? oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1 gram} =1.797 oz

Answer from: Quest

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

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