A Martian rover is descending a hill sloped at 30° with the horizontal. It travels with a constant velocity of 2 meters/second.
2 answers:
<u>Answer:</u> The horizontal velocity of rover is 1.73 m/s
<u>Explanation:</u>
Horizontal velocity is defined as the velocity of body proceeding in the horizontal direction. This velocity proceeds in the 'x' direction.
Mathematically,
where,
= constant velocity of rover = 2 m/s
= cosine function of angle 30°
Putting values in above equation, we get:
Hence, the horizontal velocity of rover is 1.73 m/s
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Answer:
The correct statement is "The electric field is directed toward the electron and has a magnitude of ".
Explanation:
According to Coulomb's law, the magnitude of the electric field due to a static point charge q at a point r distance away from it is given by
- k is the Coulmob's constant.
The direction of the electric field along the line joining the charge and the point where electric field is to be found and it is directed from positive charge to negative charge.
Conventionally, we assume a positive test charge placed at the point where electric field is to be found, the test charge has very small charge such that its charge does not affect the electric field due to the given charge.
The charge on the electron = -e.
The electric field due to an electron is given by
The direction of this electric field is from positive test charge, placed at the point where electric field is to be found, towards the electron along the line joining the two.
Thus, the correct statement is "The electric field is directed toward the electron and has a magnitude of ".
Answer:1.55 times
Explanation:
Given
First wavelength
Second wavelength
According wien's diplacement law
where
T=Temperature
Let be the temperatures corresponding to
respectively.
Thus object with is 1.55 times hotter than object with wavelength