Answer:
The ratio is 
Explanation:
The diagram for this question is shown on the first uploaded image
Here we are assume the acceleration of the train is a
which makes the acceleration of each car a
From the question we are told that
Considering the second car
The force causing it s movement is mathematically represented as

Considering the first car
The force causing it s movement is mathematically represented as

=> 
=> 
=> 
=> 
Answer:
Momentum of block B after collision =
Explanation:
Given
Before collision:
Momentum of block A =
= 
Momentum of block B =
= 
After collision:
Momentum of block A =
= 
Applying law of conservation of momentum to find momentum of block B after collision
.

Plugging in the given values and simplifying.


Adding 200 to both sides.


∴ 
Momentum of block B after collision =
Answer:
+16 J
Explanation:
We can solve the problem by using the 1st law of thermodynamics:

where
is the change of the internal energy of the system
Q is the heat (positive if supplied to the system, negative if dissipated by the system)
W is the work done (positive if done by the system, negative if done by the surroundings on the system)
In this case we have:
Q = -12 J is the heat dissipated by the system
W = -28 J is the work done ON the system
Substituting into the equation, we find the change in internal energy of the system:

A rain gauge! Hope this helps!
Answer:
<h3>10.1m/s</h3>
Explanation:
Using the equation of motion v² = u²+2as where;
v is the final velocity
u is the initial velocity
a is the acceleration due to gravity
s is the height of fall
Given
u = 2.0m/s
s = 5.0m
g = 9.81m/s²
Required
final velocity of the book in m/s
Substitute the given parameters into the formula;
v² = u²+2as
v² = 2²+2(9.81)(5)
v² = 4+98.1
v² = 102.1
v = √102.1
v = 10.1m/s
<em>Hence the final velocity of the book in m/s is 10.1m/s</em>