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
Eva8 [605]
3 years ago
13

Also need help with 20 & 21 please

Physics
2 answers:
SSSSS [86.1K]3 years ago
5 0
Number 20 is B and 21 is C
Hoochie [10]3 years ago
5 0
A density is a physical change
You might be interested in
If there is no gravity what will happen to earth?
Serga [27]
Wouldn't everything fall?
7 0
3 years ago
Read 2 more answers
Reasons<br> why using mirrors to generate electricity is not a common practice.  
olganol [36]
A big part of the reason that mirrors are seldom if ever used to generate
electricity is the simple fact that there is no way to generate electricity using
mirrors.  They are as useless for the purpose as smoke is, although there are
those who have used both items simultaneously to create the impression that
they have succeeded in that attempt.
7 0
3 years ago
Read 2 more answers
If the frequency of a periodic wave is doubled, the period of the wave will be
Lunna [17]
The period of the wave would be halved 
5 0
3 years ago
A rock is dropped from the top of a tall tower. Half a second later another rock, twice as massive as the first, is dropped. Ign
Gemiola [76]
B- the acceleration is greater for the more massive rock
5 0
2 years ago
Read 2 more answers
When you jump, you exert a pushing force against the ground. Gravity pulls you back down. Why can a person jump higher on the mo
Dennis_Churaev [7]

Answer:

This is because the force of gravity is much less on the moon than on the earth, therefore the person wont be pulled down much and will jump higher

7 0
2 years ago
Other questions:
  • What is the difference between a do universal law and a scientific theory
    14·1 answer
  • How long will it take them to glide to the edge of the rink?
    12·1 answer
  • In a double-slit experiment, the slits are illuminated by a monochromatic, coherent light source having a wavelength of 507 nm.
    14·1 answer
  • How does charging by conduction occur?
    10·2 answers
  • Can some one pls give me the knowns and unknowns , formula and answer for question 4,5,6
    12·1 answer
  • Limestone is an example of
    14·1 answer
  • An organism that obtains organic food molecules by eating other organisms or their by-products
    9·1 answer
  • What sound signal alerts others that a boat is backing up?
    11·1 answer
  • Me pueden ayudar por favor? es para hoy
    11·1 answer
  • How do gases respond to changes in pressure and temperature?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!