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3 years ago

A car travels at 40 mph. what distance will it travel in 3 hours?

Physics

2 answers:

lukranit [14]3 years ago

8 0

Car speed = 40m/ hour

3 hours = 40 × 3 = 120m /hour

Margarita [4]3 years ago

7 0

Answer:

120

Explanation:

if the car travels 40 in one hour , to find the speed in 3 hours multiply 40 x 3 which will give us 120

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3 years ago

Read 2 more answers

A vibrating object produces periodic waves with a wavelength of 53 cm and a frequency of 15 Hz. How fast do these waves move awa

DerKrebs [107]

Answer:

v = 7.95 m/s

Explanation:

Given that,

Wavelength of a wave, $\lambda=53\ cm=0.53\ m$

Frequency of a wave, f = 15 Hz

We need to find the speed of the wave. The speed of a wave is given by :

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5 0

3 years ago

Strontium−90 is one of the products of the fission of uranium−235. This strontium isotope is radioactive, with a half-life of 28

Ludmilka [50]

Answer : The time passed in years is 20.7 years.

Explanation :

Half-life = 28.1 years

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$k=\frac{0.693}{28.1\text{ years}}$

$k=2.47\times 10^{-2}\text{ years}^{-1}$

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

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t = time passed by the sample = ?

a = initial amount of the reactant = 1.00 g

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Now put all the given values in above equation, we get

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$t=20.7\text{ years}$

Therefore, the time passed in years is 20.7 years.

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3 years ago

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aksik [14]

Answer:

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Explanation:

Civilization's planet is most likely to be doomed because within the next million years the red giant star will possibly supernova. The supernova is the bursting of the star that has reached its end life. This leads to release of massive amount of energy, which can be more than the heat and energy released by the sun.

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3 years ago

A mass 25kg is attached to a spring which is held stretched a distance 120 cm by a force F=300N (Fig. 7-28), and then released.

azamat

Explanation:

Spring is stretched by force f to distance

"X"

now here by force balance we can say

f = kx

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PART 2)

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4 0

3 years ago

A car travels at 40 mph. what distance will it travel in 3 hours?​

A car travels at 40 mph. what distance will it travel in 3 hours?