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Furkat [3]
3 years ago
13

A car is driving down a highway at a speed of 65 miles per hour. To the nearest second, how long wili it take the car to drive 1

00 yards? ( 1 mile = 5280 feet, 1 yard = 3 feet)
Physics
1 answer:
Setler [38]3 years ago
4 0

Answer:

3.1468 sec

Explanation:

We have given the speed of the car is 65 miles/hour

The distance traveled by the car = 100 yards

As it is given that 1 yard = 3 feet

So 100 yard =100×3=300 feet

As in question it is given that 1 mile =5280 feet

So 300 feet =\frac{300}{5280}=0.0568miles

Now time taken =\frac{distance}{speed}=\frac{0.0568}{65}=8.7412\times 10^{-4}hour=3.1468sec

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Answer:

72 kg

Explanation:

The computation of the mass of the person is shown below:

As we know that

Water displaced weight = Raft weight + person weight

P_w.V = M_r + M_p

where

P_w denotes the water density i.e. 1000 kg/m^3

V denotes the volume of the water in m^3

Now

1000 × 0.224 = 152 + M_p

M_p = 224 - 152

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A beam of light strikes one face of a window pane with an angle of incidence of 30.0°. The index of refraction of the glass is 1
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Answer:

(a). The angle of refraction is 19.26°.

(b). That is proved that the rays in air on either side of the glass are parallel to each other

Explanation:

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Using snell's law

\dfrac{\sin i}{\sin r}=\mu

\sin r=\dfrac{\sin i}{\mu}

Put the value into the formula

\sin r=\dfrac{\sin 30}{1.52}

r=\sin^{-1}(0.329)

r=19.26^{\circ}

(b). We know that,

The incident ray and emerging ray  is equal then the ray will be parallel.

We need to prove that the rays in air on either side of the glass are parallel to each other

Using formula for emerging ray

\dfrac{\sin e}{\sin r}=\mu

\sin e=\sin r\times \mu

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\sin e=0.3289\times 1.52

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