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
guajiro [1.7K]
3 years ago
12

Why do scientists use two different models of light​

Physics
1 answer:
mrs_skeptik [129]3 years ago
5 0

Answer:

To distinguish results based on the only two variables of

awareness.

Explanation:

You might be interested in
Please help with the working of this question
Vilka [71]

Answer:

Principle of conservation of linear momentum is state as provided no external force acts on a system of colliding bodies the total linear momentum of the bodies (in a given direction) remains constant

8 0
2 years ago
Se define como la masa por unidad de volume
kogti [31]

Answer:

is it density

Explanation:

my bad if u get it wrong

7 0
2 years ago
Billy is sitting in a chair in class. If the action force is the downward push of his weight on the chair, what is the reaction
Dmitry_Shevchenko [17]
Two forces:gravity and the support force that apposes it
6 0
3 years ago
Read 2 more answers
7. An engineer is using a wire that has a resistance of 1.5. This resistance is too high for the application he is designing. Th
Nataliya [291]

Answer:

Explanation:

The resistance of a wire depends on the length of the wire and the area of crossection of wire.

resistance is directly proportional to the length of the wire

and inversely proportional to the area of crossection of the wire.

So, to decrease the resistance, length should be decreased and the area of crossection should be increased.

8 0
2 years ago
A parachutist weighs 1000N. when she opens her parachute, it pulls upwards on her with a force of 2000N. (a) draw a diagram to s
Nataly_w [17]

(a) Find free-body diagram in attachment (please rotate the picture, such that R points upward and mg points downward)

There are only two forces acting on the parachutist:

- Its weight, downward, of magnitude 1000 N, labelled with "mg" in the diagram (where m = mass of the parachutist, g = acceleration of gravity)

- The air resistance, upward, of magnitude 2000 N, labelled with "R" in the diagram

As the air resistance is larger than the weight, in the diagram it is represented with a longer arrow, in order to show the difference in magnitude.

(b) 1000 N, upward

By taking upward as positive direction, we can rewrite the two forces as:

R = +2000 N

mg = -1000 N

Where we have written the weight as a negative number, since its direction is downward.

Therefore, the net force on the parachutist will be

F = R + mg = +2000 + (-1000) = +1000 N

And the positive sign indicates that the resultant force is upward.

(c) The parachutist will be accelerated upward (= he/she will slow down)

We can answer this part by applying Newton's second law, which is summarized by the following:

F=ma (1)

where

F is the resultant force on the body

m is its mass

a is its acceleration

For the parachutist in this problem, the mass is

m=\frac{mg}{g}=\frac{1000 N}{9.8 N/kg}=102 kg

Therefore, using (1), we find the acceleration of the parachutist:

a=\frac{F}{m}=\frac{+1000}{102}=+9.8 m/s^2

Where the positive sign indicates that the acceleration is upward. Therefore, the parachutist will be accelerated upward, which means that he/she will slow down, since its direction of motion was downward.

4 0
3 years ago
Other questions:
  • A block lies on a frictionless floor. a force of 5 n pulls toward the east while a force of 4 n pulls toward the north. what is
    10·1 answer
  • Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energ
    9·2 answers
  • Kirchhoff's loop rule for circuit analysis is an expression of which of the following? Conservation of charge Conservation of en
    6·1 answer
  • Help with question 16 and 17
    13·1 answer
  • Small pockets of synovial fluid that reduce friction and act as a shock absorber where ligaments and tendons rub against other t
    15·1 answer
  • Which of these is a unit of heat? <br> a. joule <br> b. degree celsius <br> c. kelvin <br> d. tesla
    7·1 answer
  • What's a refractive medium that focuses light to a single point?
    13·1 answer
  • What is pulling force? Give any two examples.,
    8·1 answer
  • When a resistor with resistance R is connected to a 1.50-V flashlight battery, the resistor consumes 0.0625 W of electrical powe
    9·1 answer
  • If an 800.0 Kg sports car slows to 8.0 m/s in the forward direction to check out an accident scene and a 1200.0 kg pick-up truck
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!