I can't figure out what the third number I need is in this question a car traveling at +20 m/s applies the brakes and stops in 6
1 answer:
The acceleration is
Explanation:
The acceleration of an object is the rate of change in velocity of the object.
Mathematically, it is given by
where
u is the initial velocity
v is the final velocity
t is the time taken for the velocity to change from u to v
For the car in this problem, we have:
u = +20 m/s
v = 0 (because the car comes to a stop)
t = 6.5 s (time taken)
Therefore, the acceleration is
Where the negative sign means that the direction of the acceleration is opposite to the direction of the initial velocity.
Learn more about acceleration:
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Answer:
500000N/m²
5250N
Explanation:
Given parameters:
Depth(H) = 50m
Density of water = 1000kg/m³
Acceleration of free fall = 10m/s
Unknown:
Pressure the water exerts on the diver = ?
Solution:
Pressure is the force per unit area on a body. In fluids, pressure is the product of density, gravity and height
Pressure in fluids = Density x acceleration due to gravity x height
Input the variables and solve;
Pressure in fluids = 1000 x 10 x 50 = 500000N/m²
B.
width of window = 150mm
height of window = 70mm
Force water exerts on the window = ?
To solve this problem;
Pressure =
Area of the window = width x height = 150 x 10⁻³ x 70 x 10⁻³
= 1.05 x 10 ⁻²m²
Force = pressure x area
Input the variables;
= 500000N/m² x 1.05 x 10 ⁻²m²
= 5250N