Answer:
6.65m/s
Explanation:
Using the equation of motion
S = ut + 1/2gt²
S is the height of fall
t is the time
u is the horizontal velocity
g is the acceleration due to gravity
Given
S = 300 + 50
S = 350m
t = 7.8seconds
g = 9.8m/s^2
Get S
S = 7.8u + 1/2(9.8)(7.8)²
S = 7.8u + 298.116
350 = 7.8u + 298.116
7.8u = 350 - 298.116
7.8u = 51.884
u = 51.884/7.8
u = 6.65m/s
Hence the rock's horizontal velocity was 6.65m/s
(a) By definition of average acceleration,
<em>a</em> = ∆<em>v</em> / ∆<em>t</em> = (0 - 38 m/s) / (5.0 s)
<em>a</em> = -7.6 m/s²
(b) Recall that
<em>v</em>² - <em>u</em>² = 2 <em>a</em> ∆<em>x</em>
where <em>u</em> and <em>v</em> are initial and final velocities, respectively; <em>a</em> is acceleration; and ∆<em>x</em> is the change in position. So
0² - (38 m/s)² = 2 (-7.6 m/s²) ∆<em>x</em>
∆<em>x</em> = 95 m
-- impurities in the water
-- air pressure is higher than standard
To solve the exercise it is necessary to apply the concepts of Mangenetic Force and Energy generated by electric potential.
By definition we know that the energy within an electron through voltage can be expressed as
Where,
e= charge of electron
V= Voltage
The kinetic energy of a moving system can be expressed as
Where,
m = mass
v = Velocity
For energy conservation we have to
Solving to find v,
On the other hand we have that the Magnetic Force can be expressed as,
Where,
q=charge of proton
v=velocity
B= Magnetic field
Angle between the magnetic field and the velocity vector (It is perpendicular in this case)
Using the previous equation from velocity in the Force equation we have,
PART A) Replacing the values to find the force we have,
Solid,liquid , gas will aways form a homogeneous mixture
