Answer:
m = 3 kg
The mass m is 3 kg
Explanation:
From the equations of motion;
s = 0.5(u+v)t
Making t thr subject of formula;
t = 2s/(u+v)
t = time taken
s = distance travelled during deceleration = 62.5 m
u = initial speed = 25 m/s
v = final velocity = 0
Substituting the given values;
t = (2×62.5)/(25+0)
t = 5
Since, t = 5 the acceleration during this period is;
acceleration a = ∆v/t = (v-u)/t
a = (25)/5
a = 5 m/s^2
Force F = mass × acceleration
F = ma
Making m the subject of formula;
m = F/a
net force F = 15.0N
Substituting the values
m = 15/5
m = 3 kg
The mass m is 3 kg
Is An object completely submerged in a fluid displaces its own volume of fluid ". This is: D
Answer:
Explanation:
Given
Volume of paint is ![V=3.79\times 10^{-3}\ m^3](https://tex.z-dn.net/?f=V%3D3.79%5Ctimes%2010%5E%7B-3%7D%5C%20m%5E3)
Area of cover ![A=25\ m^2](https://tex.z-dn.net/?f=A%3D25%5C%20m%5E2)
Suppose paint to be a rectangular box with thickness t and volume V
therefore we can write as
![V=A\times t](https://tex.z-dn.net/?f=V%3DA%5Ctimes%20t)
![t=\frac{V}{A}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7BV%7D%7BA%7D)
![t=\frac{3.79\times 10^{-3}}{25}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B3.79%5Ctimes%2010%5E%7B-3%7D%7D%7B25%7D)
![t=1.516\times 10^{-3}\ m](https://tex.z-dn.net/?f=t%3D1.516%5Ctimes%2010%5E%7B-3%7D%5C%20m)
Sound and light, as well as all other types of mechanical and electromagnetic
radiation, travel as waves. They all carry energy from place to place.