Answer:
There are kilograms of radioactive material after 300 seconds.
Explanation:
From Physics we know that radioactive materials decay at exponential rate, whose differential equation is:
(1)
Where:
- Rate of change of the mass of the radioactive material, measured in kilograms per second.
- Current mass of the radioactive material, measured in kilograms.
- Decay constant, measured in .
The solution of the differential equation is:
(2)
Where:
- Initial mass of the radioactive material, measured in kilograms.
- Time, measured in seconds.
If we know that , and , then the initial mass of the radioactive material is:
There are kilograms of radioactive material after 300 seconds.
Answer:0.27*10^{6} (m)
Explanation:
with a wave we know that speed= wavelenght* frecuency so
wavelenght= 3*10^{7} / 109 = 0.27*10^{6} (m)
Answer:
<em>The change in momentum of the car is 3575 Kg.m/s</em>
Explanation:
<u>Impulse and Momentum</u>
The impulse (J) experienced by the object equals the change in momentum of the object (Δp).
The formula that represents the above statement is:
J = Δp
The impulse is calculated as
J = F.t
Where F is the applied force and t is the time.
The car hits a wall with a force of F=6500 N and stops in 0.55 s. Thus, the impulse is:
J = 6500 * 0.55
J = 3575 Kg.m/s
The change in momentum of the car is:
The change in momentum of the car is 3575 Kg.m/s
SPEED is distance divided by the change in time.
Force is change in momentum divided by the change in time.
Acceleration is change in velocity divided by the change in time.
Displacement is the straight-line distance and direction from the start-point to the end-point.