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Bogdan [553]
4 years ago
6

Why do sound waves move faster through the ground than through the air? A. Particles of matter are packed more loosely in the gr

ound than in the air. B. Particles of matter are packed more tightly in the ground than in the air. C. Air doesn’t contain any particles of matter to transmit sound waves. D. The elevation of the ground is lower than the elevation of the air space.
Physics
1 answer:
Fittoniya [83]4 years ago
5 0

Answer:

A

Explanation:

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Water Cycle
Nostrana [21]

Answer:

True

no water ever leaves the planet

4 0
3 years ago
Read 2 more answers
Write down two examples of where ramps are used
kumpel [21]
Airports use ramps to connect the plane to the airport and towing trucks use ramps to get the vehicles on the truck
6 0
4 years ago
Read 2 more answers
A 47.4 kg student runs down the sidewalk and jumps with a horizontal speed of 42 m/s onto a stationary skateboard
Tpy6a [65]

Answer:

3 kg

Explanation:

Momentum before = momentum after

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

After jumping on the skateboard, the student and the skateboard have the same velocity, so v₁ = v₂.

m₁u₁ + m₂u₂ = (m₁ + m₂) v

(47.4 kg) (4.2 m/s) + m (0 m/s) = (47.4 kg + m) (3.95 m/s)

m = 3 kg

8 0
4 years ago
Find the magnitude of the impulse delivered to a soccer ball when a player kicks it with a force of 1360 N. Assume that the play
Alona [7]

Answer:

7.59Ns

Explanation:

Given parameters:

Force  = 1360N

Time of contact  = 5.85 x 10⁻³s

Unknown:

Impulse  = ?

Solution:

The impulse of the ball is given as:

        Impulse  = Force x time

       Impulse  = 1360 x 5.85 x 10⁻³ = 7.59Ns

4 0
3 years ago
A kilogram is a unit of mass and when multiplied by meters per second
amm1812

Answer:

it yields a derived unit known as Newton, which is the unit of Force.

Explanation:

The formula for force is given by Newton's Second Law, which states that whenever an unbalanced force is applied to a body, it produces an acceleration in the body in the direction of force.

F = ma\\

where, F = Force

m = mass

a = acceleration

Now, we substitute the respective S.I units of each quantity in equation:

F = Newton (N)

m = kilogram (kg)

a = acceleration = m/s²

Therefore,

N = (kg)(m/s^2)

So, it is clear from above expression that:

<u>When kilogram is multiplied by meter per second squared, it yields a derived unit known as Newton, which is the unit of Force.</u>

5 0
3 years ago
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