Suppose a planet is discovered by the doppler technique and is then discovered to have transits. in that case, we can determine all the following about the planet except
a) its rotation period
b) its orbital period
c) its physical size (radius)
d) its precise mass
e) its density

option A

Explanation:

The correct answer is option A

Doppler technique is used in sound as well as light. Scientist uses this technique to study the universe by determining how fast stars and galaxies.

Transit is a phenomenon takes place when celestial body celestial passes directly between a larger body and the observer.

Using the Doppler effect we can determine the characteristics of the planet like the orbital period of the planet, size of the planet, mass and density of the planet.

The characteristics of the planet which we cannot find are The rotational period.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

the components of a vector are the parts of the vectors that are to each other.

b perpendicular