Answer:
The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters.
<em>Hope it helps</em>
<em>:D</em>
A motor is used to lift a person sitting on a platform that, combined weighs 650 N. The platform is lifted 25.0 m straight up in 18.0 seconds. What power is developed by the motor in watts?
<span>G:ivens: Force, F, displacement, s and time, t </span>
<span>U:nkowns: Power, P </span>
<span>E:quation: P = Fs/t </span>
<span>S:ubstitute P = (650 x 25)/18 </span>
<span>S:olve P = 902 7/9 watts</span>
Answer:
(a) 0.0001p W
(b) 0.1 W
(c) 1.6 W
Explanation:
(a) As there's only the flowrate 100 cm3/s (or 0.0001 m3/s), and the pressure is missing here, we shall assume that the pressure is p
The power is p*0.0001 = 0.0001p W
(b) p = 1000N/m2 and flow rate is 100 cm3/s or 0.0001 m3/s. The power shall be then
1000 * 0.0001 = 0.1 W
(c) p = 4000 N/m2 and flow rate = 400 cm3/s (or 0.0004 m3/s). The power shall be
4000 * 0.0004 = 1.6 W
Answer:
It takes you 32.27 seconds to travel 121 m using the speed ramp
Explanation:
<em>Lets explain how to solve the problem</em>
- The speed ramp has a length of 121 m and is moving at a speed of
2.2 m/s relative to the ground
- That means the speed of the ramp is 2.2 m/s
- You can cover the same distance in 78 seconds when walking on
the ground
<em>Lets find your speed on the ground</em>
Speed = Distance ÷ Time
The distance is 121 meters
The time is 78 seconds
Your speed on the ground = 121 ÷ 78 = 1.55 m/s
If you walk at the same rate with respect to the speed ramp that
you walk on the ground
That means you walk with speed 1.55 m/s and the ramp moves by
speed 2.2 m/s
So your speed using the ramp = 2.2 + 1.55 = 3.75 m/s
Now we want to find the time you will take to travel 121 meters using
the speed ramp
Time = Distance ÷ speed
Distance = 121 meters
Speed 3.75 m/s
Time = 121 ÷ 3.75 = 32.27 seconds
It takes you 32.27 seconds to travel 121 m using the speed ramp
You can't get something from nothing is practically stating the law. The law means states that energy can't be created or destroyed, in other words, it's constant. So in saying so, you truly can't get something from nothing
