1) Assuming an adult person has an average mass of m=80 kg, and assuming it takes about 30 seconds to climb 5 meters of stairs, the energy used by the person is

So the power output is

And since the estimate we made is very rough, we can say that the power output of the person is comparable to the power output of the light bulb of 100 W.

2) Based on the results we found in the previous part of the exercise, since the power output of the person is comparable to the power output of 1 light bulb of 100 W, we can say that the person could have kept burning only one 100-W light bulb during the climb.

Explanation:

8 0

2 years ago

The magnitude of the centripetal force acting on

Sergio039 [100]

1 - Radius of the path is increased
The formula for centripetal force is Fc=mv^2/r, therefore if r increases, a the divisor is larger and hence the centripetal force will be smaller.

5 0

3 years ago

a tractor pulls a wagon from rest with a constant force of 700 N eventually giving the wagon a speed of 20 km/h. how much work i

Semenov [28]

Work = Force × distance

We need to calculate distance travelled.

20km/hr = 20,000m / 60min → 333.3m/ min

333.3 × 3.5 min = 1,166.6 meters travelled

Force = 700 N and distance = 1,166.6 m

Work done is 700 N × 1,666.6 = 816,620 Nm

Power output = work /time

Power output is 816, 620 Nm / (3.5 × 60sec) →816, 620 / 210 = 3,888.7

Power output is 3,888.7 Watts.

Power output can also be expressed in joules per second so it is also correct to say work done is 3,888.7 J/s

5 0

3 years ago

If voltage , V = 100 + 6 volt and current , I = 10+ 0.2 A , then find <br> percentage error in R.

Akimi4 [234]

Explanation:

As we know, resistance is the ratio of voltage used and current flowing through the circuit. So,

By error calculation

V = 100 ± 6% V

I = 10 ± 0.2% A

∆R/R= (5/100)×100 + (0.2/10)×100

∆R/R=5+2=7%

<h2>So, percentage error in resistance (R) = ± 7%.</h2>

8 0

2 years ago