Let h = distance (m) to the water surface.
Initial velocity, u = 0 (because the stone was dropped).
Use the formula
h = ut + (1/2)gt^2
where g = 9.8 m/s^2 (acc. due to graity)
t = time (s)
h = (1/2)*(9.8)*(3^2) = 44.1 m
Newton's law of universal gravitation states that a particle attracts every other particle in the universe using a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers
Answer:
The magintude of the acceleration for both objects is ![3.11m/s^2](https://tex.z-dn.net/?f=3.11m%2Fs%5E2)
Explanation:
Drawing a free body diagram on the two boxes we can analyze the system more easily.
we can take the acceleration going up as positive for reference purposes.
for mA let's suppose that is ascending so:
![T_A-m_A*g=m_A*a](https://tex.z-dn.net/?f=T_A-m_A%2Ag%3Dm_A%2Aa)
and for mB (descending):
![T_B-m_B*g=-m_B*a](https://tex.z-dn.net/?f=T_B-m_B%2Ag%3D-m_B%2Aa)
![T_A=T_B](https://tex.z-dn.net/?f=T_A%3DT_B)
because the two boxes has the same acceleration because they are attached together:
![m_B*g-m_B*a-m_a*g=m_a*a\\(m_B-m_A)*g=(m_a+m_B)*a\\a=\frac{(7.05kg-3.65kg)*9.8m/s^2}{3.65kg+7.05kg}\\\\a=3.11m/s^2](https://tex.z-dn.net/?f=m_B%2Ag-m_B%2Aa-m_a%2Ag%3Dm_a%2Aa%5C%5C%28m_B-m_A%29%2Ag%3D%28m_a%2Bm_B%29%2Aa%5C%5Ca%3D%5Cfrac%7B%287.05kg-3.65kg%29%2A9.8m%2Fs%5E2%7D%7B3.65kg%2B7.05kg%7D%5C%5C%5C%5Ca%3D3.11m%2Fs%5E2)
So the magintude of the acceleration for both objects is ![3.11m/s^2](https://tex.z-dn.net/?f=3.11m%2Fs%5E2)
Answer:
. Doppler ultrasound is based on absorption of sound, and other
ultrasound technology is based on reflection.D.
Explanation:
Answer: A and C (i took the test)
Explanation: Hope this helps:)