As we've seen, the exhaust speed in part (a) was 2000 m/s, and the exhaust speed in part (b) was 5,000 m/s, which is obviously 2.50 times faster than in part (a). However, there is no relationship between the beginning and end fuel mass. The necessary fuel mass is not just less by a factor of 2.50 since the initial and final fuel masses really have a logarithmic relationship rather than a simple linear one.
<h3 /><h3>What is exhaust speed?</h3>
The exhaust speed is the difference between the rocket speed and the propellant speed. The exhaust speed of the best chemical rockets is close to 3,000 meters per second. Exhaust speeds while using electric propulsion can reach 20,000 meters per second or greater.
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Answer:
16 2/3 hr
Explanation:
250 000 km / 15 000 km/hr = 16 2/3 hours
Answer:
Centripetal force = 634.6 newton
Explanation:
Given that,
Weight of the automobile, M = 125 Kg
The tangential speed of the automobile, V = 48 Km/h
V = 13.33 m/s
The radius of the circular road, R = 35 m
The centripetal force is given by the relation
Fc = MV²/R
Where M - the mass of the body
V - velocity of the body
R - Radius of its trajectory
Substituting in the above equation
Fc = 125 Kg x 13.33² m²/s² / 35 m
= 22211.11 / 35 newton
= 634.6 newton
Hence, the centripetal force acting on the automobile is 634.6 N
Answer:
This is an incomplete question. The complete question is --
An individual white LED (light-emitting diode) has an efficiency of 20% and uses 1.0 W of electric power.
How many LEDs must be combined into one light source to give a total of 3.8W of visible-light output (comparable to the light output of a 100W incandescent bulb)?
And the answer is --
19 LEDs
Explanation:
The full form of LED is Light emitting diode.
It is given that the efficiency of the LED bulb is 20 %
1 LED uses power = 1 W
So the output power of 1 LED = 0.2 W
We need to find the power required to give a 3.8 W light.
Power required for 3.8 W = Number of LEDs required = (total required power / power required for 1 LED )
= 3.8 / 0.2
= 19
Therefore, the number of LEDs required is 19.