1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zielflug [23.3K]
3 years ago
7

Physical Science Pre-Test 2020-2021 Question: 1-10 The distance between Earth and the Moon was determined by measuring the time

it took for light waves from Earth to travel to the Moon and back. Why was it not possible to use sound waves for this experiment Sound waves must move through a substance Sound waves would change frequency on the return to Earth Sound waves move too slowly for the technique to be accurate Sound waves move more slowly in Earth's atmosphere than in space​
Physics
1 answer:
LiRa [457]3 years ago
5 0

Answer:

Option A - Sound waves must move through a substance

Explanation:

Unlike light waves, sound waves must travel through a medium/substance for such a medium to vibrate and then produce sound.

As a matter of fact sound can't travel through empty space.

Thus, looking at the options given, the correct one is:

Sound waves must move through a substance which is Option A

You might be interested in
Jana is observing a young autistic boy in a preschool classroom. Her job is to note each time the boy gets up from his chair wit
svp [43]
The answer is tallying
3 0
3 years ago
A World War II bomber flies horizontally over level terrain, with a speed of 287 m/s relative to the ground and at an altitude o
Scorpion4ik [409]

Answer: 7.38 km

Explanation: The attachment shows the illustration diagram for the question.

The range of the bomb's motion as obtained from the equations of motion,

H = u(y) t + 0.5g(t^2)

U(y) = initial vertical component of velocity = 0 m/s

That means t = √(2H/g)

The horizontal distance covered, R,

R = u(x) t = u(x) √(2H/g)

Where u(x) = the initial horizontal component of the bomb's velocity = 287 m/s, H = vertical height at which the bomb was thrown = 3.24 km = 3240 m, g = acceleration due to gravity = 9.8 m/s2

R = 287 √(2×3240/9.8) = 7380 m = 7.38 km

6 0
3 years ago
The acceleration due to gravity on the moon is 1.6 m/s2. What is the gravitational potential energy of a 1200-kg lander resting
Monica [59]
Gravitational potential energy<span> is </span>energy<span> an object possesses because of its position in a </span>gravitational<span> field. </span><span>The equation for </span>gravitational potential energy<span> is GPE = mgh. 

GPE = 1200(1.6)(350) = 672000 J

Hope this answers the question. Have a nice day.</span>
8 0
3 years ago
Read 2 more answers
A "570-W" electric heater is designed to operate from 120-V lines. What current does it draw? If the line voltage drops to 110 V
Viefleur [7K]

Answer:

Watts=Volt*Amps

So A=570/120=4.75amps

If voltage drops to 110V We get A=570/110=5.(18...)amps

4 0
3 years ago
Read 2 more answers
A bicycle racer rides from a starting marker to a turnaround marker at 10 m/s. She then rides back along the same route from the
andrew11 [14]

Given :

A bicycle racer rides from a starting marker to a turnaround marker at 10 m/s.

She then rides back along the same route from the turnaround marker to the starting marker at 25 m/s.

To Find :

Her average speed for the whole race.

Solution :

We know, average velocity is given by :

Average \ Velocity = \dfrac{v_1 + v_2}{2}\\\\Average\ Velocity = \dfrac{10 + 25}{2}\\\\Average \ Velocity = \dfrac{35}{2}\\\\Average \ Velocity = 17.5 \ m/s

Therefore, average speed for the whole race is given by 17.5 m/s.

3 0
3 years ago
Other questions:
  • I need help on #9 (it's side ways sorry...)
    14·2 answers
  • Suppose a body has a force of 10 pounds acting on it to the right, 25 pounds acting on it −135° from the horizontal, and 5 pound
    13·1 answer
  • How does space promote science education
    13·1 answer
  • Which of the following is an illuminated object? a lightbulb a fire the Sun the Moon
    10·2 answers
  • A point charge is placed at the center of a spherical Gaussian surface. The electricflux ΦEischangedif(a) a second point charge
    5·1 answer
  • Equilibrium of forces
    5·2 answers
  • A stone falls freely from rest for 8.0s what is it final velocity
    15·1 answer
  • In order to go in a circle at a constant speed an object needs
    13·1 answer
  • During an adiabatic process in a closed system, what happens to a gas when the gas expands?
    11·1 answer
  • Please help quick
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!