Answer:
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Explanation:
Answer:
Explanation:
The force of static friction acting on the box is the frictional force;
Frictional force Ff = Wsin theta (force acting along the ramp)
W is the gravitational force known as the weight
Ff = 112.1sin42°
Ff = 112.1(0.6691)
Ff = 75.00N
Hence he force of static friction acting on the box if box has a gravitational force of 112.1 N id 75.00N
Answer:
Explanation:
From the first law of thermodynamics
Q=ΔU+W
Q=heat supplies to the system
ΔU=change in internal energy of the system
W= work done by the gas by the system
Q =12 KJ
ΔU=
=(mR/k-1)ΔT
ΔU=
*(460-400)
=14.924 KJ
Q=ΔU+W
W=-2.924 KJ
=
+
=work done by the air
= P(V2-V1)
=mRT2-mRT1
=mR(T2-T1)=0.138*0.287*(460-300)=
=6.33 KJ
=+
=-2.924-6.33
=-9.26 KJ
No, you wouldn't do any more work by going up the stairs twice as fast.
work done is equal to : F x D
time is not included, which mean you only done the work faster, but not doing any more work compared to the slower one
hope this helps
