Answer:
B) The cosmic background radiation is expected to contain spectral lines of hydrogen and helium, and it does.
Explanation:
To solve this we assume
that the gas inside the balloon is an ideal gas. Then, we can use the ideal gas
equation which is expressed as PV = nRT. At a constant pressure and number of
moles of the gas the ratio T/V is equal to some constant. At another set of
condition of temperature, the constant is still the same. Calculations are as
follows:
T1 / V1 = T2 / V2
V2 = T2 x V1 / T1
V2 = 308 K x 556 cm³ / 278 K
<span>V2 = 616 cm</span><span>³</span>
Answer:
no way I had that question too :-O anyways here's the answer
Explanation:
willow ptarmigan and Walia ibex
Answer:
When the force is applied along the direction of motion of the object.
Explanation:
When the force is applied in the direction of the velocity vector of the object, then only the magnitude of the velocity changes and the direction of motion remains unchanged. For example is you push an already moving cart in the direction its moving, then you will only changed its speed and not its direction.