Answer:
33 kg m/s
Explanation:
The momentum of an object is given by:
where
m is the mass of the object
v is the velocity of the object
In this problem, the total mass of the child and the wagon is m =22 kg, while the velocity is v = 1.5 m/s, therefore the momentum is
Answer:
Option D is the correct answer.
Explanation:
We equation for elongation
Here we need to find weight required,
We need to stretch a steel road by 2 mm, that is ΔL = 2mm = 0.002 m
E = 200GPa = 2 x 10¹¹ N/m²
L=2m
Substituting
Option D is the correct answer.
Precisely 84% if the Earth is made of mantle.
Answer: 0.522 m
Explanation:
This situation is related to projectile motion, where the initial velocity of the car has only the horizontal component. This means the angle is equal to zero (). And the equations we will use to find the height of the cliff are:
(1)
Where:
is the final height of the car
is the initial height
is the initial velocity of the car
is the time
is the acceleration due to gravity
is the angle
is the horizontal distance traveled by the car after passing the cliff
Well, firstly we have to find from (1):
(3)
(4)
Substituting (4) in (2):
(5)
Isolating :
(6)
(7)
Finally: