A girl is sitting in a sled sliding horizontally along some snow (there is friction present).
1 answer:
Answer:
159 N
Explanation:
There are two types of force of friction:
- Static friction: this is the force of friction that occurs when the object is at rest
- Kinetic friction: this is the force of friction that occurs when the object is in motion
In this problem, the girl is sitting on the sled, and the sled is sliding: this means that the object is in motion, therefore the force of friction that we have to calculate in this problem is the force of kinetic friction.
The force of kinetic friction acting on an object sliding over a flat surface is given by
where
is the coefficient of kinetic friction
N is the normal force on the object
In this problem:
N = 636 N
Therefore, the force of kinetic friction is
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Answer:
Explanation:
In the question given :
Pressure is constant
Therefore, Work done,
Pressure, P=1.01 × 105 Pa.
Final volume,
Initial volume,
Therefore, W=8.58\times 10^{5}\ J.
Also, Heat Given,
Also, according to First law of thermodynamics:
Hence, this is the required solution.
Answer:
194,400 joules of kinetic energy.
Explanation:
Remember that to calculate the Kinetic energy you need to use the next formula:
We know that Mass= 1200 kg and velocity is 18m/s, so we insert those values into the formula:
So the kinetic energy of a car moving at 18m/s with a mass of 1200 kg would be 194,400 joules.