Answer:
a) Δp = -2.0 kgm / s, b) Δp = -4 kg m / s
Explanation:
In this exercise the change in moment of a ball is asked in two different cases
a) clay ball, in this case the ball sticks to the door and we have an inelastic collision where the final velocity of the ball is zero
Δp = p_f - p₀
Δp = 0 - m v₀
Δp = - 0.100 20
Δp = -2.0 kgm / s
b) in this case we have a bouncing ball, this is an elastic collision, as the gate is fixed it can be considered an object of infinite mass, therefore the final speed of the ball has the same modulus of the initial velocity, but address would count
v_f = - v₀
Δp = p_f -p₀
Δp = m v_f - m v₀
Δp = m (v_f -v₀)
Δp = 0.100 (-20 - 20)
Δp = -4 kg m / s
Answer:
The number of calories needed is 6c.
Explanation:
The amount of energy 
needed to raise the temperature 
of water of mass 
is
where 
is the specific heat capacity of water.
Putting in numbers into equation (1), we get:
which is the number of calories needed.
Answer:
Injections of aqueous solution of fruct
levulose of formula C, H, O,,
For
prevent dehydration such solutions are obtained
dissolving a mass m = 25g of fructose for a volume of 50
final solution.
1.1 Calculate the molecular molar mass of fructose
1.2 Determine the amount of corresponding fructose material
1.3 Calculate the molar concentration of these fructose solutions
1.4
Answer:
The strength of the electric field is 
.
Explanation:
Given that,
Speed 
Time 
Angle = 45°
We need to calculate the acceleration
Using equation of motion
We need to calculate the strength of the electric field
Using relation of newton's second law and electric force
Put the value into the formula
Hence, The strength of the electric field is .
