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
An external mirror is a mirror that points outward, creating views of whatever it is reflecting
That's 'centrifugal' force.
In American Sign Language (ASL), the sign for "alone" is made by using one hand to tap the shoulder a couple of times.
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.