Answer:
mass of the object is : -
=》15.55 kg
Explanation:
force (f) = mass (M) × Acceleration (A)
=》280 = M × 18
=》M = 280 ÷ 18
=》M = 15.55 kg
The cloud chamber, the Geiger counter, and a piece of
photographic film can all reveal the presence of radioactivity.
Batteries don't.
The object is not accelerating
Very very roughly, an Earth month.
The Sun isn't solid, so it doesn't all have to rotate at the same rate. Different latitudes actually rotate at different speeds. One complete rotation is about 24 days at the Sun's equator, but 35 days near the poles !
I think it would be constellations
