Answer:
the acceleration of the rocket is: a=vemΔmΔt−g a = v e m Δ m Δ t − g .
Explanation:
I answered this before.
hope this helps! :)
The are called alakali earth metals.
Answer:
The speed at which she threw the marshmallow is approximately 4.76 m/s
Explanation:
The given in formation are;
The range in which the marshmallow was thrown = 2 m (The location of her friend)
The angle at which the marshmallow was thrown = 30 degrees
The horizontal range is given by the following formula;
![R = \dfrac{u^2 \times sin(2\cdot \theta)}{g}](https://tex.z-dn.net/?f=R%20%3D%20%5Cdfrac%7Bu%5E2%20%5Ctimes%20sin%282%5Ccdot%20%5Ctheta%29%7D%7Bg%7D)
Where;
R = The range = 3 m
u = The initial velocity
θ = The angle at which the marshmallow was thrown = 30°
g = The acceleration due to gravity = 9.81 m/s²
By substitution, we have;
![2 = \dfrac{u^2 \times sin(2\times 30)}{9.81} = \dfrac{u^2 \times sin(60)}{9.81}](https://tex.z-dn.net/?f=2%20%3D%20%5Cdfrac%7Bu%5E2%20%5Ctimes%20sin%282%5Ctimes%2030%29%7D%7B9.81%7D%20%3D%20%20%5Cdfrac%7Bu%5E2%20%5Ctimes%20sin%2860%29%7D%7B9.81%7D)
![\therefore u^2 = \dfrac{ 2 \times 9.81}{sin(60)} = \dfrac{u^2 \times sin(60)}{9.81} \approx 22.66](https://tex.z-dn.net/?f=%5Ctherefore%20u%5E2%20%3D%20%5Cdfrac%7B%202%20%5Ctimes%209.81%7D%7Bsin%2860%29%7D%20%3D%20%20%5Cdfrac%7Bu%5E2%20%5Ctimes%20sin%2860%29%7D%7B9.81%7D%20%5Capprox%20%2022.66)
u ≈ √(22.66) ≈ 4.76 m/s
u ≈ 4.76 m/s
The speed at which she threw the marshmallow ≈ 4.76 m/s.
Answer:
a vacuum formed above the column of mercury in a mercury barometer.
Answer:0.3
Explanation:
Given
velocity of car=15 m/s
truck brought to halt in a distance of 38 m
We know
![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
Final velocity (v)=0
![0-(15)^2=2(a)(38)](https://tex.z-dn.net/?f=0-%2815%29%5E2%3D2%28a%29%2838%29)
![a=\frac{-225}{76}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B-225%7D%7B76%7D)
(deceleration)
Therefore minimum coefficient of friction \mu will be
![\mu \times g=a](https://tex.z-dn.net/?f=%5Cmu%20%5Ctimes%20g%3Da)
![\mu =\frac{a}{g}](https://tex.z-dn.net/?f=%5Cmu%20%3D%5Cfrac%7Ba%7D%7Bg%7D)