B. There is not enough matter in space to transmit sound waves.
Explanation:
Sound waves are created when there is a vibration of the particles in a medium. For example, our voice is an example of sound wave: when we speak, the molecules of air around us start vibrating, producing regions of higher concentration of molecules (called compressions) and of lower concentration (called rarefactions). It is clear from this definition that sound waves can only propagate if there is a physical medium: such as a gas, a liquid or a solid, but sound waves cannot propagate through empty space.
Since space is almost empty, the correct choice is
B. There is not enough matter in space to transmit sound waves.
Answer: Air resistance is "pushing" the ball upwards.
Explanation:
Answer:
0.775 kg-m/s
Explanation:
Convert the units to the right unit forms necessary
250 g -> 0.25 kg
11.16 km/h -> 3.1 m/s
Now use the formula:
velocity
mass /
momentum / /
\ / /
\ / /
p = mv
p = 0.25 × 3.1 = 0.775 kg-m/s
Hope this helps you!
Bye!
Answer:
1.13 x 10⁵N
Explanation:
Given parameters:
Pressure of the coin press = 3.2 x 10⁸ Pa
radius of the nickel coin = 0.0106m
Unknown:
Force of the press on coil = ?
Solution:
Our knowledge of pressure will help us solve this problem.
Pressure is defined as the force applied per unit area on a body.
Pressure = 
Force = Pressure x Area
Since the pressure is known;
Area of the coin = Area of a circle = π r²
where r is the radius of the coin;
Area of the coin = π x 0.0106² = 3.53 x 10⁻⁴m²
Force = 3.2 x 10⁸ x 3.53 x 10⁻⁴ = 1.13 x 10⁵N
