We have to use implicit differentiation, because we are figuring how it is changing with respect to time, not just the radius. So recall that the area of a circle is given by the formula A = â•¥r2. So....
dA/dt = (â•¥)(2r) dr/dt
We need to calculate dA/dt
After 2s, r = 50(2) = 100
dA/dt = â•¥(2)(100)(50)
= 10,000â•¥ cm2/s
The area of a circle is A=πR2 , as a function of time (in seconds) it is A(t)=π(Rt)2 Find the derivative of the area with respect to the radius dA/dR=A'(t)=2πRt So the rate the area is increasing at 7s is given by A'(7)=2π(70X7)=980π cm/s2 or 3078.76 cm/s2
Radio waves were discovered before the radio was invented.
a satellite in orbit; it is moving at constant speed but is accelerating outward in circular acceleration, balanced by gravity acceleration (centripetal force).
It's called a brim.brim: a circular projection that sticks outward from the crown of a hat
Seismic Waves
Seismic wAves
primary waves
Seismic wAves
That's 'centrifugal' force.
An external mirror is a mirror that points outward, creating views of whatever it is reflecting
It is a ficticious force, which seems to push things outward from the center, when objects move in circular movement - or, more generally, in a curve.
It is a ficticious force, which seems to push things outward from the center, when objects move in circular movement - or, more generally, in a curve.