Answer:
The thickness of the foil is 0.017 mm.
Explanation:
Given that,
Weight = 7.5 oz = 212.6175 gm
Density = 2.70 g/cm³
Area of aluminium = 50 ft² = 46451.52 cm²
We need to calculate the thickness of the foil
Using formula of density
Where, A = area
t = thickness
m = mass
Put the value into the formula
Hence, The thickness of the foil is 0.017 mm.
Answer:
(a) 0.061 m/s
(b) 0.103 m/s
Explanation:
From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum
Momentum, p=mv where m is the mass and v is the velocity
where
is the common velocity,
is the velocity of the ball
and
are masses of the ball and person respectively
Substituting the given values then
(b)
Momentum, p=mv where m is the mass and v is the velocity
is the velocity of the ball ,
is the velocity of ball afterwards and
is your speed,
and
are masses of the ball and person respectively. Since it bounces back, we give it a negative value hence