By the Pythagorean theorem we get . Thus the resultant velocity will be 5 m/s.
However there is a typo in the choices. It should take 25 seconds to cross the river, not 20 seconds, since the boat actually travels 125 meters due to the water current, and 125/5 = 25 seconds.
Alternatively you can calculate the eastward component of travel and get 100 / 4 = 25 seconds.
They should be bigger as if it is hot the tracks will expand as it is made of metal and then there is more room for it to expand or contract
Frequency can be found by counting the number of troughs per second in a wave diagram.
Answer: h = u^2 / 2g
Explanation:
Given the following :
Horizontal Velocity of projection= u
If :
magnitude of horizontal = magnitude of vertical Displacement
u = u
Minimum height of tower (h) =?
Horizontal Velocity = u
Gravity potential energy = mgh - - - (1)
Kinetic energy = 1/2 mu^2 - - - (2)
m = mass
Where u = magnitude of velocity
g = acceleration due to gravity
h = height
Equating (1) and (2)
mgh = 1/2 mu^2
gh = 1/2 mu^2
2gh = u^2
u = √2gh
Vertical component of Velocity 'v' will be:
u = √2gh
u = √2 × g × h
Square both sides
u^2 = 2 × g × h
h = u^2 / 2g
Answer:
Neptune
Explanation:
The solar system is made up of the sun with its associated planets, asteroids, meteors, satellites (i.e.,moons), and comets orbits around it. The Sun is a yellow dwarf star. Its gravity holds the solar system together, keeping everything in its orbit.
Although Neptune travels at a very high speed of 5.43 km/s, Neptune still has the slowest orbital velocity of any of the planets.