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zhannawk [14.2K]
3 years ago
6

A car travels 30 km north in 25 min. and 40 km east in 35 min. What is the total time in hours? Be careful to carry over the pro

per number of significant figures when you convert to hours.
Physics
2 answers:
lapo4ka [179]3 years ago
4 0

Answer:

t = 1.0 hours

Explanation:

as we know that all the data is given here in 2 significant figures

so here we need to find the total time of the motion

that time must be in two significant figures

here we know that

t_1 = 25 min

t_2 = 35 min

so here total time is given as

t = t_1 + t_2

t = 25 + 35

t = 60 min

t = 1.0 hour

inna [77]3 years ago
3 0
25+35=60mins so 1.0 hours
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Identify the following as
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A rock is projected upward from the surface of the moon, at time t = 0.0 s, w a velocity of 30 m/s. The acceleration due to grav
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Explanation:

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y-y_{o}=V_{o}.t+\frac{1}{2}g.t^{2}    (1)

V=V_{o}-g.t    (2)

Where:

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On the other hand, the maximum height  is accomplished when V=0:

V=V_{o}-g.t=0    (4)

V_{o}-g.t=0    

V_{o}=g.t    (5)

Finding t:

t=\frac{V_{o}}{g}    (6)

Substituting (6) in (3):

y=V_{o}(\frac{V_{o}}{g})+\frac{1}{2}g(\frac{V_{o}}{g})^{2}    (7)

y_{max}=\frac{{V_{o}}^{2}}{2g}    (8)  Now we can calculate the maximum height of the rock

y_{max}=\frac{{(30m/s)}^{2}}{(2)(1.62m/s^{2})}   (9)

Finally:

y_{max}=277.777m  

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