D) The Sun would revolve around the Earth. 8. In the geocentric model (the Earth at the center of the universe), which motion would occur? B) the Sun in circular orbits C) Earth in slightly elliptical orbits D) Earth in circular orbits 9.
Answer:
Option B
0.3 m/s2 South
Explanation:
Acceleration, 
where v and u are final and initial velocities respectively, t is the time taken
Substituting 14.1 m/s for v, 17.7 m/s for u and 12 s for t then
Since this is negative acceleration, it's direction is opposite hence 0.3 m/s2 South
Answer: Mean Arterial Pressure is directly proportional to Cardiac Output and Systemic Vascular Resistance and also directly proportional to Central Venous Pressure.
Explanation: Based on the relationship of flow, pressure and resistance, the mean arterial pressure is determined by the cardiac output (CO), systemic vascular resistance (SVR), and central venous pressure (CVP). This relationship is given by:
MAP = (CO x SVR) + CVP
Which is alternatively expressed as:
MAP = CO x SVR (this is because at any point in time in blood circulation, the central venous pressure is always near to zero mmHg.
Due to this direct relationship, any factor affecting the cardiac output and the Systemic Vascular Resistance would cause a corresponding change in the Mean Arterial Pressure.
It is also worthy to note that If Cardiac Output and Systemic Vascular Resistance change reciprocally (inversely) and proportionately, then Mean Arterial Pressure will not change. The plotted graph is one of positive slope.
The whole relationship occurs when blood is pumped out of the left ventricle into the aorta and distributing arteries, creating pressure.
I = Delta p
I = Impulse
Delta p = Momentum variation
Delta p = pf - po
Pf = Final momentum
Po = Initial momentum
p = m x v
M = Mass
V = Velocity
Delta p = (m x Vf) - (m x Vo)
I = 1.2 x 10^3 x 20 - 12 x 10^2 x 18
I = 2.4 x 10^4 - 216 x 10^2
I = 2.4 x 10^4 - 2.16 x 10^4
I = 0.24 x 10^4
I = 24 x 10^2 Newtons x seconds (N x s)
Answer: The value of impulse is 24 x 10^2 Newtons x seconds (N x s).
Question:
An object will sink in a liquid if the density of the object is greater than that of the liquid. The mass of a sphere is 61.3g.
If the volume of this sphere is less than ________ cm3, then the sphere will sink in liquid mercury (density = 13.6 g/cm3).
Answer:
Explanation:
Given
Liquid: Mercury
-- of liquid
Required
Determine the volume at which the liquid will sink
First, we need to calculate the volume of the sphere for which it will have the same density as the mercury.
This is calculated as follows
Make Volume the subject
Substitute values for Mass and Density
This implies that:
If the volume of the sphere is less than 4.51, the density will be greater than the density of the mercury and so the object will sink
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