Answer:
2 times
Explanation:
Given:
u = 10 m/s
v = 20 m/s
To Find:
Factor of change in Momentum = ?
Solution:
Final Momentum = mv
Final Momentum = m(20)
Final Momentum = 20m
Initial Momentum = mu
Initial Momentum = m(10)
Initial Momentum = 10m
Therefore, Factor of change in Momentum = 20m / 10m = 2 times
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Answer:
The number of photons per second that strike the given area is 2.668 x 10⁸ photons/second
Explanation:
Given;
intensity of the sunlight, I = 2.00 kJ·s−1·m^−2
area of incident, A = 5.2 cm² = 5.2 x 10⁻⁴ m²
Energy of incident photons per second on the given area;
E = IA
E = (2000)( 5.2 x 10⁻⁴)
E = 1.04 J/s
Energy of a photon is given is by;

The number of photons per second that strike the given area is;

Therefore, the number of photons per second that strike the given area is 2.668 x 10⁸ photons/second
Answer:
a) ω = 0.305 rad/s counterclockwise
b) W = 61.875J
Explanation:
The angular speed of the woman is:

By conservation of the angular momentum:
where ωo = 0
Solving for
:

Work done by the woman is given by the variation on her kinetic energy:

Answer:
Explanation:
Given
masss of football player 
Velocity of football player 
mass of football 
velocity of football 
Final velocity will be given by applying conservation of linear momentum
After catching the ball Player and ball moves with same velocity




So, final velocity will be 
Answer:
The g at the top of the mountain is 9.820 m/s².
Explanation:
The period of simple pendulum is given as;

where;
T is period of the oscillation
g is acceleration due to gravity
l is length of the pendulum

Therefore, the g at the top of the mountain is 9.820 m/s².