Calculate (a) how long it took King Kong to fall straight down from the top of the Empire State Building (380 m high). **** (use
1 answer:
Answer:
c 8.80 s
Explanation:
Given parameters:
Height of Empire State Building = 380m
Unknown:
Time taken for King Kong to fall = ?
Solution:
To solve this problem, we use one of the kinematics equation.
The appropriate one is given below;
H = ut + g t²
H is the height
t is the time taken
g is the acceleration due to gravity
380 = (0 x t) + ( x 9.8 x t²)
380 = 4.9t²
t² = 77.55
t = 8.8s
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Answer:
m = 2.2 x 10⁻⁴ kg = 0.22 g
Explanation:
The surface tension of water is 0.072 N/m. So in order for the bug to avoid sinking, its weight per unit length of contact must be no more than the surface tension of water. Therefore,
where,
m = mass of bug = ?
g = acceleration due to gravity = 9.81 m/s²
L = Contact length = (contact length of each leg)(No. of Legs) = (5 mm)(6)
L = 30 mm = 0.03 m
Therefore,
<u>m = 2.2 x 10⁻⁴ kg = 0.22 g</u>
Answer:
0.48 kgm/s
Explanation:
= mass of the particle = 2.43 μg = 2.43 x 10⁻⁶ x 10⁻³ kg = 2.43 x 10⁻⁹ kg
= velocity of the particle = 1.97 x 10⁸ m/s
= momentum of the particle
momentum of the particle is given as
inserting the values
kgm/s