Answer:
T=21.7 min
Explanation:
The volume of one mole of gas at STP is
22.4 L
10.0 L
then has
n'=10.0/22.4 moles
the total energy released is then
Et= (10.0/22.4)* 286 kJ
Et=127.678 KJ
Power*time = energy, so time = energy/power =
Power=100W
Power=100 J/s
T= 127.6785kJ/100J/s = 1277 sec
T=1276.78sec/60min=21.3 min
Answer:
Explanation:
Net force by which man push the lawn mower is given as
now it is given that 37% of this force is vertically downwards
so we will have
now we also know that
here we have
Now work done by this force to move the lawn mower is given as
Answer:
21.8 m/s
Explanation:
At the top of the hill (crest), there are two forces acting on the motorcycle:
- The reaction force of the road, N (upward)
- The force of gravity, mg (downward)
Since the motorcycle is moving by circular motion, the resultant of these forces will give the centripetal force, so:
where the direction of the weight (mg) is equal to that of the centripetal force, and where
m is the mass of the cycle
g = 9.8 m/s^2 is the acceleration of gravity
v is the speed
r = 48.6 is the radius of the hill
The cycle loses contact with the road when the reaction force becomes zero:
N = 0
Substituting into the equation, we therefore find the maximum speed that is allowed for the cycle before losing constact:
Answer:
33,333.3J/s
Explanation:
Energy expended which is the work done in Joule
=250,000J
Time taken to expend the energy =7.5s
Power =Unknown
Formula
Power = <u> </u><u> </u><u> </u><u> </u><u> </u><u>Work</u><u> </u><u> </u><u> </u>
Time
Hence, Power = <u>250,000J</u>
7.5s
Power = 33,333.3J/s
To calculate the mass of the fuel, we use the formula
Here, m is the mass of fuel, V is the volume of the fuel and its value is and is the density and its value of 0.821 g/mL.
Substituting these values in above relation, we get
Thus, the mass of the fuel 247 .94 kg.