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ludmilkaskok [199]
3 years ago
5

Jane starts from her house to take a stroll in her neighborhood. After walking for 2 hours at a steady pace, she has walked 4 mi

les and is 2 miles from home. For this time, what was her speed?
A. 4 mph
B. 3 mph
C. 2 mph
D. 1mph
Physics
2 answers:
Lubov Fominskaja [6]3 years ago
5 0

Answer: C. 2mph

Explanation:

Speed is the rate of change in distance. Since distance has to do with how far an object has gone, it means we will only take consideration of how far she has walked which is 4miles.

Mathematically, Speed = Distance/time

Given distance = 4miles and time = 2hours

Speed = 4miles/2hours

= 2miles/hour i.e 2mph

9966 [12]3 years ago
3 0

Answer:

C. 2 mph

Explanation:

speed equals total distance covered in total time of of travel

since,

total distance = 4 miles

time taken = 2 hrs

speed = 4m / 2hrs =2mph

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A piano wire has a tension of 650 N and a mass per unit length of 0.060 g/cm. What is the speed of waves on this wire
Trava [24]

Answer:

The speed of waves on this wire is 329.14 m/s

Explanation:

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tension of the wire, T = 650 N

mass per unit length, μ = 0.06 g /cm  = 0.006 kg/m

(convert the unit of mass per length in g/cm to kg/m by dividing by 10 = 0.06 / 10 = 0.006 kg/m)

The speed of waves on this wire is given as;

v = \sqrt{\frac{T}{\mu} } \\\\v = \sqrt{\frac{650}{0.006} }\\\\v = 329.14 \ m/s

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3 years ago
In an emergency situation, firemen need to respond as quickly as possible. If a fireman is responding from the second floor, how
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melomori [17]

Answer:

A. Their same forces repel each other, and their opposite forces attract each other.

Explanation:

As we know by the property of electric charge that similar charges repel each other and opposite charges attracts each other

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