Answer:
a) 
b) 
degrees and on this case to the South of the East.
c)
d) 
So it would be 250 to the South
Explanation:
Part a
For this case the figure attached shows the illustration for the problem.
We know that 
represent the velocity of the river to the south.
We have the velocity of the motorboard relative to the water and on this case is 
And we want to find the velocity of the motord board relative to the Earth 
And we can find this velocity from the Pythagorean Theorem.
Part b
We can find the direction with the following formula:
degrees and on this case to the South of the East.
Part c
For this case we can use the following definition
The distance would be D = w = 600 m and the velocity V = 4.8m/s and if we solve for t we got:
Part d
For this case we can use the same definition but now using the y compnent we have:
And replacing we got:
So it would be 250 to the South
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The best answer would be C.
The mass of an element depends on the number of particles found in the nucleus of the atom. Atomic mass can be computed by adding the number of protons and the number of neutrons. Protons and neutrons are found in the nucleus of an atom. So the answer must be letter C.
Answer:
the second one
Explanation:
When a free positive charge q is accelerated by an electric field, such as shown in Figure 1, it is given kinetic energy. The process is analogous to an object being accelerated by a gravitational field. It is as if the charge is going down an electrical hill where its electric potential energy is converted to kinetic energy. Let us explore the work done on a charge q by the electric field in this process, so that we may develop a definition of electric potential energy.
The electrostatic or Coulomb force is conservative, which means that the work done on q is independent of the path taken. This is exactly analogous to the gravitational force in the absence of dissipative forces such as friction. When a force is conservative, it is possible to define a potential energy associated with the force, and it is usually easier to deal with the potential energy (because it depends only on position) than to calculate the work directly.
1.98 kilograms
weight on the moon = (weight on Earth / acceleration of Earth's gravity) x acceleration of the moon's gravity
weight on the moon = (12 kg. / 9.81 m/s^2) x 1.63 m/s^2
weight on the moon = 1.98 kg.
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