Answer:
The total momentum of the cat and the dog is, p = 2.4 kg m/s
Explanation:
Given,
The mass of the cat, m = 800 g
= 0.800 kg
The mass of the dog, M = 1000 g
= 1 kg
The velocity of the cat taken positive x direction, v = 8 m/s
The velocity of the dog, V = - 4 m/s
The momentum of the body is defined as the product of its mass and velocity.
p = mv
The momentum of the cat,
p₁ = 0.8 x 8
= 6.4 kg m/s
The momentum of the dog,
p₂ = MV
= 1 x -4
= -4 kg m/s
The total momentum,
p = p₁ + p₂
= 6.4 + (-4)
= 2.4 kg m/s
Hence, the total momentum of the cat and the dog is, p = 2.4 kg m/s
According to a Physics student in a row boat floating on the same river, the canoe has NO kinetc energy. Zero.
According to another Physics student standing on the riverbank watching both boats, the kinetic energy of the canoe is 12 Joules.
Both students are correct.
Answer:
f = 2ππ √g / A
Explanation:
The expression that describes the simple harmonic movement is
x = A cos (wt + Ф)
So that the penny should the surface when the system is going down the system must in faster than the acceleration of gravity, let's look for this acceleration
v = dx / dt
a = dv / dt = d²x / dt²
.a = - A w² cos (w t + Ф)
The maximum value of this acceleration is when the cosine value ±1
a = A w²
For the penny to leave the surface the limit acceleration is
a = g
g = A w²
w² = g/A
w = 2π f
g / A = 4 π² f²
f = 2ππ √g /A
For values greater than this frequency the penny separates from the surface in the downward movement
Answer:
The right option is C. i.e L
Explanation:
Dimension of a quantity is the collection of the indexes of each of the fundamental quantities contained in it.
Therefore, to get the dimension of A in the equation
X=Asin(2(pi)ft)
Making A the subject of the formula
A = X / (sin(2(pi)ft)
Since sin(2(pi)ft which is a trigonometric function does not have a dimension
A = L
The dimension of A is L
Answer:
A solar flare as it may harm satellites and aircrafts flying near poles
Explanation:
Since solar flare is electro magnetic waves going to Earth the waves will mostly get absorbed by the north and south poles resulting in the aurora borealis, but if the solar flare is strong enough it may stop communications and engines in satellites and aircrafts and in result harming them