$340\,\dfrac{\mathrm m}{\mathrm s}\cdot\dfrac{3.281\,\mathrm{ft}}{1\,\mathrm m}\cdot\dfrac{1\,\mathrm{mi}}{5280\,\mathrm{ft}}=0.21\,\dfrac{\mathrm{mi}}{\mathrm s}$

Then the time it takes for the sound to travel 20 miles is

$\dfrac{20\,\mathrm{mi}}{0.21\,\frac{\mathrm{mi}}{\mathrm s}}=95\,\mathrm s$

3 0

3 years ago

The mass of a large car is 1000 kg. How much force would be required to accelerate the car at a rate of 3msec2

pogonyaev

Answer:

3000 N

Explanation:

We have,

• Mass, m = 1000 kg

• Acceleration, a = 3 m/s²

We have to find force required, F.

$\longrightarrow$ F = ma

$\longrightarrow$ F = 1000 × 3 N

$\longrightarrow$ F = 3000 N (Answer)

8 0

2 years ago

True or False: As the mass of an object increases, the gravitational pull increases

Lunna [17]

Answer: The answer is obviously True!!!!

Explanation: The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects. ... However, the exponent on the mass terms is one.

7 0

3 years ago