Answers:
a) 5400000 J
b) 45.92 m
Explanation:
a) The kinetic energy 
of an object is given by:
Where:
is the mass of the train
is the speed of the train
Solving the equation:
This is the train's kinetic energy at its top speed
b) Now, according to the Conservation of Energy Law, the total initial energy is equal to the total final energy:
Where:
is the train's initial kinetic energy
is the train's initial potential energy
is the train's final kinetic energy
is the train's final potential energy, where 
is the acceleration due gravity and 
is the height.
Rewriting the equation with the given values:
Finding :
Answer:
3.33m/s
Explanation:
Speed is the change in distance of a body with respect to time.
Speed = Distance/Time
Given
Distance = 1100m
Time = 330s
Speed = 1100/330
Speed = 3.33m/s
Hence her average speed in m/s is 3.33m/s
Answer:
metal and non-metal
Explanation:
Ionic bonds are formed when a metal loses electrons and a non-metal gains said electrons.
Answer: The total energy created by the Alpha decay.
Explanation: The sum total of the kinetic energy of the alpha particle and the new nucleus is the total energy created by the alpha decay.
Consider the decay of a radioactive nuclide by the spontaneous emission from its nuclei of alpha particles. An alpha particle which is composed of two protons and two neutrons and has a charge of +2. With an appreciable mass and its ejection from the nuclide creates a certain amount of recoil energy in the nucleus. The total energy (Ex) created by alpha decay is therefore the sum of the kinetic energy of the particle, the recoil energy given to the new nucleus, and the total energy of any emitted gamma rays.
It can go through the all the states: solid, liquid, and gas.
On the ground, it is a liquid as water. Then, it evaporates and becomes water vapor, a gas. As it condensates, little droplets of vapor come together. Then, it falls to the Earth as liquid water or frozen as solid snow/sleet/hail in precipitation.
Hope this helps!!
