Average force is 666.67 N
<u>Explanation:</u>
Given that :
m = Mass of the baseball = 0.2 kg
u = Initial velocity = 20 m/s
v = Final velocity = 40 m/s
t = Time taken for change in velocity = 0.006 s
We know:
Force exerted = mass × acceleration = m ×a
Acceleration can be found by means of dividing the change in velocity measured in m/s by the time taken in seconds.
a = 
= 
m/s²
Now we have to find the force using the formula, F = mass × acceleration as,
F = 0.2 kg ×3333.3 ms⁻² = 666.67 N
Initial angular velocity wi = 0
final angular velocity wf = 2.9 x 10⁴ rev/min
wf = 2.9 x 10⁴ (2*3.14 rad)/(60 sec)
wf = 3.035 x 10³ rad/sec
time t = 3 sec
angular acceleration α
wf = wi + αt
3.035 x 10³ = 0 + α(3)
α = 1012 rad/s²
(b) angle covered is θ
θ = wi*t + (1/2)αt²
θ = 0*3 + (1/2)(1012)(3²)
θ = 4554 rad
A car uses stored chemical energy in gasoline to move. The engine changes the chemical energy into heat and kinetic energy to power the car. A toaster changes electrical<span> energy into heat and light energy</span>
Of my knowlaedge, the suns light rays are so intense that they bounce off of other planets and shine on the face of the moon giving us the ability ti see the moon at night.
Answer:
The correct answer is option 'D': 1.2 Joules
Explanation:
Since the energy associated with the electric field is conservative thus we conclude that the
Kinetic energy of the moving particle equals the change in electrostatic potential energy.
For the initial case
Now V associated with the 2.0μC charge is
Applying the given values we get
When the moving charge reaches x = 1.0 meter the energy becomes
Thus the change in energy is 
