Answer: - 7500N
Explanation:
Given the following :
Initial Velocity of car = 108km/hr
Time taken to stop after applying brakes = 4s
Mass of passengers in car = 1000kg
Force exerted by the brakes on the car =?
After 4s, then final Velocity (V) = 0
Initial Velocity (u) of the car = 108km/hr
108km/hr = (108 × 1000)m ÷ (3600)s = 30m/s
Force exerted = mass(m) × acceleration(a)
Acceleration of car = Change in Velocity with time
a = (v - u) / t
a = (0 - 30) / 4
a = - 30/ 4
a = - 7.5m/s^2
Therefore,
Force exerted = mass(m) × acceleration(a)
Force exerted = 1000kg × (-7.5)m/s^2
Force exerted = - 7500N
Answer:
1. The reason why a plane mirror forms a virtual image is because it doesn't let the light go through it, but it reflects the light, so if you go behind the plane mirror, then you won't see the rays of light since it's not letting the rays of light go behind it.
2. The image cannot be projected onto a screen also.
3. Also, the Rays of light never meet at a focus point, so hence, this is why the plane mirror forms a virtual image.
Thanks!
Answer:
The can mass is 0,00359 kg or 3,59 g
Explanation:
1. Relevant Data:
Steel thickness= 0.13 mm or 0.013 mm
h=11 cm
d=6 cm
ρ=800 kg/m^3
2. Calculate mass from densisty equation:
, then 
We need to estimate the volume of the can to calculate the mass.
3. Estimate volume using differentials:
Cylinder volume equation is:
Considering that the can is an object with a hole inside, then we need to estimate the real volume of the sheet of steel.
Using differentials we have:
Then, we could say that 
Replacing the values of d, h and dD, we obtain:
4. Calculate the mass
Convert volume unit into 
Calculate mass
No because the path the electricity needs to follow is broken. In parallel circuit,electricity has more that one path to follow.
<span>Geologists cannot yet predict earthquakes because the earthquakes caused by the movement of plates do not have the precise time and place when will it moves.</span>
