3 years ago

How long would it take a sound wave from a car alarm to travel 1 km if the temperature is 0 degrees Celsius

1 answer:

3 0

The speed of sound in dry air at 0°C is 331.3 meters per second.

(1,000 meters) x (1 second / 331.3 meters) = 3.018 seconds .

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Hubble law how did astronomers gather the information needed to establish the law?

Korvikt [17]

They measured the wavelength of light emitted by stars using spectrometers and found it was being redshifted.
This implied the stars were moving away aka the space between the scientists and the star was expanding

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3 years ago

How many stars are in a galaxy? hundreds thousands millions billions.

faust18 [17]

Answer:

Billions :)

<em>hope this helps! <3</em>

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2 years ago

What is the mass of a stone moving at a speed of 15 meters/second and having a momentum of 7.5 kilogram - meters / seconds

Elanso [62]

Answer:

0.5 kg

Explanation:

The momentum of an object is defined as

p = mv

where

m is the mass

v is the velocity

In this problem we have,

v = 15 m/s is the velocity of the stone

p = 7.5 kg m/s is the momentum

Solving for m, we can find the mass of the stone:

$m=\frac{p}{v}=\frac{7.5 kg m/s}{15 m/s}=0.5 kg$

4 0

3 years ago

Read 2 more answers

How many seconds will it take for a satellite to travel 450,000 m at a rate of 120 m/s?

V125BC [204]

3750 seconds to travel that far

5 0

3 years ago

To measure the acceleration due to gravity on a distant planet, an astronaut hangs a 0.070-kg ball from the end of a wire. The w

mote1985 [20]

Answer:

g = 1.64m/s²

Explanation:

1.5m in 0.078s

V = 15 / 0.078

= 19.23m/s

Tension = mg

μ = 3.10 × 10⁻⁴

T = V²μ

mg = V²μ

g = V²μ / m

g = ((19.23)²(3.10 × 10⁻⁴)) / (0.070)

g = 1.64m/s²

7 0

3 years ago