what has more momentum, a baseball traveling at 4 m/s or a baseball traveling at 16m/s ? and which has more energy ?

Answers

Answer 1

Answer: We know the formulas for momentum and energy. But they both involve the mass of
the object, and we don't know the mass of the baseball. What can we do ?

It's not a catastrophe. The question only asks which one is bigger. If we're clever,
we can answer that without ever knowing how much the momentum or the energy
actually is. We know that both baseballs have the same mass, so let's just call it
' M ' and not worry about what it really is.

Momentum of anything = (mass) x (speed)
Momentum of the first baseball = (M) x (4 m/s) = 4M
Momentum of the second one = (M) x (16 m/s) = 16M
The second baseball has 4 times as much momentum as the first one has.

Kinetic energy of anything = 1/2 (mass) x (speed squared)
KE of the first baseball = 1/2 (M) x (4 squared) = 8M
KE of the second one = 1/2 (M) x (16 squared) = 128M
The second baseball has 16 times as much kinetic energy as the first one has.

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As a bat flies toward a wall at a speed of 6.0 m/s, the bat emits an ultrasonic sound wave with frequency 30.0 kHz. What frequency does the bat hear in the reflected wave?

Answers

Answer:

$f_b = 29.98 Hz$

Explanation:

speed of bat = 6 m/s

sound wave frequency emitted by bat = 30.0 kHz

as we know,

speed of sound (c)= 343 m/s

$f_w = f((c+v_r)/(c+v_s))$

$f_w = 30((343+0)/(343+6))$

$f_w = 29.48 Hz$

now frequency received by bat is equal to

$f_b = f((c+v_r)/(c+v_s))$

$f_b = 29.48((343+6)/(343+0))$

$f_b = 29.98 Hz$

hence the frequency hear by bat will be 29.98 Hz

Final answer:

The Doppler effect represents the change in frequency of a wave due to the motion of the source or the observer. In this case, the bat hears a higher frequency because of its motion towards the wall and the reflection of the sound wave back towards it.

Explanation:

The question is asking for the frequency the bat hears when it emits a sound and the sound is reflected back after hitting a wall. This is an example of the Doppler effect, where the frequency of a wave changes for an observer moving relative to the source of the wave.

Let's denote the emitted frequency as f (30.0 kHz), the speed of the bat as v (6.0 m/s), and the speed of sound in air as v_s (approximately 343 m/s).

First, when the bat emits the ultrasonic wave, the frequency of the wave will increase because of the motion of the bat towards the wall. The formula for observed frequency (f') when source and observer are getting closer is given by f' = f * (v_s + v) / v_s.

Next, the wall will reflect this wave back towards the bat. Since the wave is moving towards the bat, the frequency will increase again by the same factor, resulting in a final observed frequency of f'' = f' * (v_s + v) / v_s. When you substitute f' into this equation, you'll get: f'' = f * (v_s + v)^2 / v_s^2

Learn more about Doppler effect here:

brainly.com/question/15318474

#SPJ12

How does increasing the tension of a spring affect a wave on the spring?

Answers

Increasing the tension of a spring affects a wave on the spring because it increases the frequency. When the tension rises, so does the frequency.

Answer: Increases the frequency of the wave

Explanation:

Increasing the tension of a spring means increasing its stiffness. The wave produced thereafter has greater frequency.

Higher tension causes the spring to have greater restoring force causing it to quickly come back to its equilibrium position. Thus, the speed of the wave also increases.

An object is in (blank) when its distance from a(n) (blank) is changing

Answers

1st motion 2nd reference point

Planets in our solar system do not revolve around the sun in perfect circles. Their orbits are more like ovals that scientists describe as which of the following? A.
revolutionary
B.
rotational
C.
periodical
D.
elliptical

Answers

Their orbits are more like ovals that scientists describe as elliptical.

Orbit

It is a regular, repeating path, which one object in space takes around another one.

The comets, planets, asteroids, and other objects in the solar system orbit the Sun.

The majority of the objects orbiting the Sun move close or along to an imaginary flat surface. This imaginary surface is known as the ecliptic plane.

All the orbits are elliptical that shows that they are ellipse, identical to an oval.

The planets in the solar system do not revolve around the Sun in perfect circles, their orbits are more like ovals, which are illustrated by scientists as elliptical.

Thus, the correct answer is option D.

To know more about:

brainly.com/question/2513966

The correct answer of the given statement above would be option D. The planets in our solar system do not revolve around the run in perfect circles. And their orbits are more like of a shape of an oval in which it is described as elliptical. This is according to the Law of Orbits by Kepler.

Find the wavelength of a 26 Hz sound wave traveling through air at 20ºC. Hint: speed of sound at 20ºC = 343 m/s

Answers

The correct answer for the question that is being presented above is this one: "B. 13m."

The formula of wave velocity is this:
wave velocity = f * λ
λ = v / f
λ = 343m/s / 26Hz
λ = 13.20m .. ans (b)

Here are the following choices:
A. 5m
B. 13m
C. 28m
D. 58m

Which of the following most directly shows how physics affects society?A. A car comes equipped with side air bags.
B. A business conducts meetings over the Internet.
O C. A surgeon performs a heart transplant.
D. A singer wins an award for a song she wrote.

Answers

the answer is definitely A.

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