A car with a mass of 860 kg sits at the top of a 32 meter high hill. Describe the transformations between potential and kinetic
1 answer:
Answer:
Kinetic energy at the bottom equals potential energy at the top hence 269971.2 J
Explanation:
Assuming no friction and neglecting air resistance, from the law of conservation of energy, the potential energy that the car posses at 32 m is all converted to kinetic energy hence
PE= mgh
Here m denotes the mass of the car, g is acceleration due to gravity, h is the height and v is the speed of the car
The potential energy will be PE= 860*9.81*32=269971.2 J
You might be interested in
Answer:
35.6 N
Explanation:
We can consider only the forces acting along the horizontal direction to solve the problem.
There are two forces acting along the horizontal direction:
- The horizontal component of the pushing force, which is given by
with
- The frictional force, whose magnitude is
where , m=8.2 kg and g=9.8 m/s^2.
The two forces have opposite directions (because the frictional force is always opposite to the motion), and their resultant must be zero, because the suitcase is moving with constant velocity (which means acceleration equals zero, so according to Newton's second law: F=ma, the net force is zero). So we can write: