Answer is B.
Because velocity is vector quantity, so magnitud and direction are needed to define it.
Since velocity means the speed(magnitude) of some object in a given direction, so it’s units are usually measured by meters/ seconds
Though astronomers don't use kilograms when measuring such large objects as the Sun or galaxies, the Milky Way and its halo would be about 6 x 10^42 kilograms<span>.
-Hope this helped!</span>
Answer:
Flying in a plane gives the notion of one exiting the earths atmosphere and also, there is the risk of exposure to dangerous cosmic radiation.
Nuclear power plants possesses great forms of chemicals and toxic elements that could lead to chemical radiation and further more, cause mutation of human cells which invariably brings cancer. There is the extreme health hazard to be weary of when in a nuclear power plant.
Being struck by lightning can be hazardous to ones health and could bring forth a number of health problems like; hearing and/or vision loss, irregular heartbeat, headache, chest pain, hypersomnia, confusion, shortness of breath, weakness, stiffness, and/or temporary paralysis.
Exposure to BPA in plastics has been connected to be cause of a number of fertility problems, male impotence, heart disease, and other conditions.
What do all of these problems have in common? They all are things you never see coming, you can't literally control the particles from nuclear plants, the forces handling the elevation and descending of planes, the chemical and physical nature of compounds involved in lightning production as compared to not exercising and knowing what could come from that. The side effects of not exercising can not be compared to the latter explained and those are life threatening processes.
Answer:
option (d)
Explanation:
Acceleration due to gravity on mars = twice the acceleration due to gravity on moon
According to the conservation of energy, the kinetic energy at the time of hitting is totally converted into potential energy at height.
On the surface of moon, let the value of acceleration due to gravity is a and the ball rises upto height h.
So, kinetic energy = Potential energy
1/2 mv^2 = m x a x h ...... (1)
On the surface of mars, the value of acceleration due to gravity is 2a and the ball rises upto height h'.
So, kinetic energy = Potential energy
1/2 mv^2 = m x 2a x h' ...... (2)
By equating equation (1) and equation (2),we get
2h' = h
h' = h / 2
Thus, the ball rises upto half of the height as that of moon.