The time taken to complete her run is 1.9 hr.
<u>Explanation:</u>
Speed is a scalar quantity and it is defined as the ratio of distance covered to the time taken to cover that distance. As distance is also a scalar quantity, so the directions given in the problem can be ignored. Thus, the distance covered by the jogger is the sum of kilometers given in problem.
Distance covered = 6+5+4 = 15 km
And the speed is given as 8 km/hr.
So the time taken will be ratio of distance to speed.
So the jogger will take 1.9 hr to complete her run.
B) 10 atm
Explanation:
Given parameters:
initial pressure = 2atm
initial volume = 0.5m³
Final volume = 0.1m³
unknown:
final pressure = ?
Solution:
We are going to solve this problem using the appropriate gas law. This is the Boyle's law.
Boyle's law states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".
Mathematically;
P1 is the initial pressure
V1 is the initial volume
P2 is the final pressure
V2 is the final volume
input the variables;
2 x 0.5 = P2 x 0.1
P2 = = 10atm
learn more:
Gas law brainly.com/question/8928288
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100 watts = 100 joules per second
22 watts = 22 joules per second
Saving = 78 joules per second
1 hour = 3,600 seconds
24 hours = 86,400 seconds
(78 joules/sec) x (86,400 sec) = 6,739,200 joules