Answer b c
Explanation:
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Answer:
Average velocity = 30 miles per hour
Explanation:
Given that
Velocity for uphill = 20 miles per hour
Velocity for downhill = 60 miles per hour
We know that
Distance = Velocity x time
Total distance = Average velocity x total time
Lets take distance from home to school is s
Time taken from home to school= s/20 hr
Time taken from school to home= s/60 hr
Total time =s/20+s/60
Total distance = Average velocity x total time
s + s = Average velocity x (s/20+s/60)
So average velocity = 30 miles per hour
Answer:
150
Explanation:
P=F/A
10=15/A
10*15=15/A*15
150=A
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Answer:
8018.2 N
Explanation:
Change in momentum, p is equivalent to force * time
M(vf-vi)=Ft where M represent mass of the car, vf is the final speed, vi is the intial speed of the car, F is the force in queation and t ia the time.
Since the car finally comes to rest then the final velocity ia zero. Substituting 1400 Kg for M, 0 for vf, 27 m/s for vi and 1.5 s for t then the first force is
1400(0-27)=1.5F
F=25200 N
Similarly, when we work with the same values but t changed to 2.2s
1400(0-27)=2.2 F
F2=17181.818181818 N
Reduced force will be 25200-17181.818181818=−8,018.181818182N
Approximately, 8018.2 N
Answer:
S = 2 * pi * 1 m = 6.28 m = distance traveled
V = S / T or T = S / V = 6.28 m / 5 m/s = 1.26 sec
This will be the time for 1 revolution or the period of the motion.
