Answer:
Please find the answer in the explanation.
Explanation:
Given that the actual speed of the car at the top of the hill is 20.0m/s. What is the reason for this difference in velocity?
Speed is a scalar quantity that is, it has only magnitude but no direction.
While velocity is a vector quantity, that is, it has both magnitude and direction.
If the actual speed of a car is 20 m/s, that is the magnitude of the speed only without direction.
The velocity will therefore be of the same magnitude but with addition of direction. Either west, east or north south.
One of the scientist's jobs is to report the results of his experiments to all the other scientists in the world.
There isn't a single real science shop anywhere in the world that uses the US customary system of units. Not one.
Even in the measly three countries that use it for measuring carpet, pumping gas, and weighing fish ... Myanmar, Liberia, an the USA ... the scientists do their work in the SI/MKS/metric system.
Answer:
The final energy of the system is 168 J
Explanation:
Heat energy released to the surroundings, 
Work done, W = 222 J
The initial internal energy, 
The change in internal energy is given by the formula, 
The final energy of the system is 168 J
The solution for this problem is:
Remember that this doesn’t depend on the mass of the child.
E = T + U = constant
E (maximum height) = T + U =U = mgh = mg[r - r· cos (Θ)]
E (bottom height) = T + U = T = ½mv² = mg[r - r · cos (Θ)]
v² = 2g[r – r · cos (Θ)]
v = √ (2g[r-r·cos(Θ)])
= √(2(9.8)[3 – 3 · cos (45°)])
= 4.15 m/s or 15 kph
We can take as positive direction the direction of the train, and as negative direction the direction of the girl. The speed of the train relative to the girl will be given by the difference between the two velocities:
which means
