Answer:
T = 0.96 seconds
Explanation:
Given that,
The speed of wave, v = 2.6 m/s
The distance between wave crests,
We need to find the period of the wave motion. Let T be the period. So,
So, the period of the wave motion is equal to 0.96 seconds.
Answer:
A - elastic since many other fast food items could be considered close substitutes.
Explanation:
The price elasticity of demand is how much the demand of the Big Macs will change due to a 1% change in price. Should the elasticity be greater than 1, the Big Macs will be elastic. Should it be less than 1, the Big Macs are inelastic.
Demand elasticity is calculated as the percentage change in quantity demanded divided by a percentage change in price.
Since Big Macs are (i) a luxury good, and (ii) have close substitutes (other burgers available at McDonalds and other fast food stores), we will say their elasticity is greater than 1.
This means that the demand of Big Macs will change due to a 1% increase in price due to the presence of close substitutes.
Block on the incline:
• net force parallel to the incline
∑ <em>F</em> (para.) = <em>m₁ g</em> sin(38°) - <em>T</em> = <em>m₁ a</em>
where <em>T</em> is the magnitude of tension in the cord.
Notice that we take down-the-incline to be the positive direction, so that if the 3.9-kg block pulls the 2.6-kg block upwards, then the acceleration of the system is positive.
Suspended block:
• net vertical force
∑ <em>F</em> (vert.) = <em>T</em> - <em>m₂</em> <em>g</em> = <em>m₂</em> <em>a</em>
<em />
Solve both equations for the acceleration <em>a</em>, set the results equal to one another, and solve for <em>T</em> :
<em>a</em> = <em>g</em> sin(38°) - <em>T</em>/<em>m₁</em>
<em>a</em> = <em>T</em>/<em>m₂</em> - <em>g</em>
==> <em>g</em> sin(38°) - <em>T</em>/<em>m₁</em> = <em>T</em>/<em>m₂</em> - <em>g</em>
==> <em>T</em> (1/<em>m₂</em> + 1/<em>m₁</em>) = <em>g</em> (sin(38°) + 1)
==> <em>T</em> = <em>g</em> (sin(38°) + 1) / (1/<em>m₂</em> + 1/<em>m₁</em>)
==> <em>T</em> = (9.81 m/s²) (sin(38°) + 1) / (1/(2.6 kg) + 1/(3.9 kg)) ≈ 25 N
Having different densities being swirled rapidly will cause sedimentation. Sedimentation is the segmentation of the mixture creating layers of particles of these different densities. The process of rapid swirling is called differential centrifugation. An example use of this method is separation human blood into, red, platelet and white blood cells.