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aleksley [76]
3 years ago
7

How bad is the heavy​ traffic? You can walkwalk 1212 miles in the same time that it takes to travel 3232 miles by car. If the​ c

ar's rate is 55 milesmiles per hour faster than your walkingwalking ​rate, find the average rate of each.
Physics
1 answer:
zysi [14]3 years ago
3 0

Answer:

Speed by walking is 33 miles per hour

And speed of by car is 88 miles per hour

Explanation:

We have given that it takes same time to walk 1212 miles as 3232 miles by car

Now let the speed by walk is x

As speed by car is 55 miles per hour faster than by walk = x+55

As time is same and we know that time is given as time=\frac{distance}{speed}

So \frac{1212}{x}=\frac{3232}{x+55}

1212(x+55)=3232x

1212x+66660=3232x

x = 33 miles per hour

So speed by walking is 33 miles per hour

And so speed of car = 33+55 =88 miles per hour

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A ray of light traveling in air is incident on the flat surface of a piece of glass at an angle of 65.9° with respect to the nor
stich3 [128]

Answer:

n_{glass} = 1.6

Explanation:

\theta _{i} = Angle of incidence = 65.9°

\theta _{r} = Angle of refraction = 34.8°

n_{air} = Index of refraction of air = 1

n_{glass} = Index of refraction of glass = ?

Using Snell's law

n_{air} Sin\theta _{i} = n_{glass} \theta _{r}

(1) Sin65.9 =  n_{glass} Sin34.8

n_{glass} = 1.6

6 0
4 years ago
A 0.30 kg yo-yo consists of two solid disks of radius 5.10 cm joined together by a massless rod of radius 1.0 cm and a string wr
docker41 [41]

Answer:

0.70046 m/s²

2.732862 N

Explanation:

g = Acceleration due to gravity = 9.81 m/s²

m = Mass of yo-yo = 0.3 kg

R = Radius of rolling disk = 5.1 cm

r = Radius of rod = 1 cm

For a rolling disks the acceleration is given by

a=\frac{g}{1+\frac{R^2}{2r}}\\\Rightarrow a=\frac{9.81}{1+\frac{0.051^2}{2\times 0.01^2}}\\\Rightarrow a=0.70046\ m/s^2

The acceleration of the yo-yo is 0.70046 m/s²

The tension in the string will be

T=m(g-a)\\\Rightarrow T=0.3\times (9.81-0.70046)\\\Rightarrow T=2.732862\ N

The tension in the string is 2.732862 N

8 0
3 years ago
Which of the following is an element?
Sergeeva-Olga [200]
Oxygen is on the Periodic Table of Elements as a member of the chalcogen group. It is a chemical element represented by the symbol O.

B would've also been a right answer if it weren't for the Dioxide part.

But the answer is C. Oxygen.
3 0
3 years ago
You are pushing a 7.5kg block. It is moving at 2.3m/s when you release your push. It takes 2 seconds to stop. Find the coefficie
IRISSAK [1]
Hope this helps you.

5 0
3 years ago
How do subatomic particles create net charge on objects?
Andru [333]

Answer:

If an object has more protons than electron then the net charge on the object is positive but if it has more electrons than protons the net charge on the object is negative.  The object is electrically neutral if the number of protons is equal to the number of electrons.

Explanation:

Atom is composed of different subatomic particles . The 3 major subatomic particles are proton , neutron and electrons. The proton and the neutron is concentrated in the nucleus of an atom. The  nucleus forms the dense core of an atom. The protons are positively charged while the electrons are negatively charged .The neutrons are neutrally charged.  The electrons forms a cloud around the nucleus of an atom.

The net charge is defined as sum of the charges on an object.  The 2 electric charges available are positive or negative charges. The proton are positive while the electron are negative. Although the mass of the proton is greater than the electron but the magnitude of their charges are equal . If an object has more protons than electron then the net charge on the object is positive but if it has more electrons than protons the net charge on the object is negative.  The object is electrically neutral if the number of protons is equal to the number of electrons.

 

4 0
3 years ago
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