Answer: A.E.
Explanation: To understand the distinction between mass and weight and to be able to calculate the weight of an object from its mass and Newton's law of gravitation. The concepts of mass and weight are often confused. In fact, in everyday conversations, the word "weight" often replaces "mass," as in "My weight is seventy-five kilograms"
Answer:
The correct option is C
Explanation:
From the question we are told that
The distance between axles of the car is 
The position of the car's center of mass is 
Now we can evaluate the distance of the center of mass to the rear axle as follows

substituting values


assuming the car is at equilibrium, taking moment about the center of mass

=> 
=> 
substituting values

Note [
is the front axle weight and
is the rear axle weight ]
Answer:
To find out what water is made of, it helps to look at its chemical formula, which is H2O. This basically tells us that the water molecule is composed of two elements: hydrogen and oxygen or, more precisely, two hydrogen atoms (H2) and one oxygen atom (O).
Explanation:
Answer:
Velocity= 19.05 m/s
Kinetic energy= 3.08 J
Explanation:
The corn possess potential energy. Feom law of conservation of energy, all the potential eneegy will be converted to kinetic energy, with negligible friction.
Potential energy, PE= kinetic energy, KE
Potential energy is given by mgh while kinetic energy is given by 
Equating
Making v the subject of the formula then

Substituting 9.81 m/s2 for g and 18.5 m for h then the velocity will be

To get the kinetic eneegy, since PE=KE AND KE is

Substituting v with 19.05 and m with 0.017 kg we have

This can also be achieved by mgh since PE=KE hence 0.17*9.81*18.5=3.085245 J and the results are slightly different due to small energy losses and rounding off of values.