Please show the steps: 4. A 1250kg race car accelerates from 0 to 60 miles per h
ID: 1409718 • Letter: P
Question
Please show the steps:
4. A 1250kg race car accelerates from 0 to 60 miles per hour in 4.5 seconds. What is the net force required to provide this acceleration?
5. The largest supertanker ever built, the Seawise Giant, had a maximum capacity of 4240865 barrels of oil. Given the following information, determine how many US daily commutes a single shipment by the Seawise Giant could have supplied?
The average American commuter drives 30 miles a day and the average car’s usable output is 3549 BTU/mile. The step efficiencies of a gasoline automobile are:
Raw fuel production 83%
Engine 20%
Mechanical 75%
Transmission system 70%
6. How much energy will it take to melt a 30.0 kg block of ice? If this energy was used to power a 60-watt light bulb, how long could the light stay on?
Explanation / Answer
4.
60 miles/hour=26.82 m/s
F=m*a=1250kg*a
a=(vf-vo)/(tf-to)=(26.82m/s-0)/(4.5sec-0)=5.96m/s^2
F=1250kg*5.96m/s^2=7450N
6.
The heat required to change the phase of a substance is given by the equation:
Q= mL (Q= Heat required, m= mass, L= Latent Heat of Fusion/Evaporation/Anything else).
So, according to your values:
Q= 3.0 kg x 333 kJ/Kg
So, Q= 999 kJ
If this energy was used to power a 60-watt light bulb, how long could the light stay on?
P(watts)=E(joules)/t(sec)....t=E/P=999x10^3Joules/60watt=16650 seconds