The mass is moving by uniformly accelerated motion, with initial velocity
and acceleration
. Its position at time t is given by the following law:
where we take the initial position
since we are only interested in the distance traveled by the mass.
If we put
into the equation, the corresponding time t is the time it takes for the mass to travel this distance:
And the two solutions for the equation are:
--> negative, we can discard it
--> this is the solution to our problem
Answer:
b) The star is moving away from us.
Explanation:
If an object moves toward us, the light waves it emits are compressed - the wavelength of the light will be shorter, making the light bluer. On the other hand, if an object moves away from us, the light waves are stretched, making it redder. If from laboratory measurements we know that a specific hydrogen spectral line appears at the wavelength of 121.6 nanometers (nm) and the spectrum of a particular star shows the same hydrogen line appearing at the wavelength of 121.8 nm, we can conclude that the star is moving away from npos, since the wavelength related to that star is more expanded.
Let's list the given information. The frictional force, denoted as Ff, is equal to 0.200 N. We have to find the normal force, denoted as Fn. The relationship between Ff and Fn is written as:
Ff = μFn
where μ is the coefficient of friction
If there is no given data for μ, we can't solve this problem. Suppose μ = 0.5, then the normal force would be:
Fn = Ff/μ = 0.2/0.5 = 0.4 N
Answer:
True - Archimedes Principle states that the buoyant force on an object is equal to the weight of the liquid displaced.
