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
Arturiano [62]
3 years ago
15

Why doesn’t change in a substance during a physical change?

Physics
1 answer:
iris [78.8K]3 years ago
3 0

Answer:

there is no change because a physical change only changes the physical appearance of a substance

Explanation:

a chemical change is the only change that can change a substance since it changes the chemical properties of the substance, hence making a new substance

You might be interested in
Why do gamma rays have no charge?
Yakvenalex [24]
For the same reason that light and radio waves have no charge. 
Gamma rays are very short electromagnetic waves.
8 0
3 years ago
A 970-kg sports car collides into the rear end of a 2300-kg SUV stopped at a red light. The bumpers lock, the brakes are locked,
vlabodo [156]

Answer:

22.73 m/s or 81.72 kph

Explanation

We can find the combined mass of both cars as

970 kg + 2300 kg = 3270 kg.

Then the normal force of the cars can be calculated as

F(n)= mg

Where g is acceleration due to gravity 9.8m/s^2

3270 kg ×9.8 = 32046 kg*m/s^2.

coefficient of kinetic friction between tires and road to be 0.80 × F(n)

Then the frictional force can be calculated as

= (32046kg*m/s^2 × 0.80 )

= 25636.8 kg*m/s^2

We can now calculate the work done that was used stopping the cars as

Frictional force × distance

(25636.8 kg*m/s^2 ) × 2.9m= 74346.72kg*m^2/s^2

From kinetic energy formula, the combined velocity of the car can be determined

E=0.5 M V²

√(2E/M) = V

√(2*74346.72kg*m^2/s^2 / 3270 kg) = V

V= √ (45.472)

V=6.743293m/s

the momentum of both cars can be determined as

6.743293m/s * 3270 kg

= 22050.57kg*m/s

Now the final momentum of both cars must be equal to the the momentum of

the sports car just prior to the collision. Therefore, the speed of the sports car at impact.

=(22050.57 kg*m/s) / 970 kg = 22.73 m/s

We can convert that to km/h.

22.73 m/s * 3600 s/h / 1000 m/km = 81.72 kph

7 0
2 years ago
if the forces are moving in the same direction, ____ the forces. Please help i’m actually so confused!
jasenka [17]

Answer:

Explanation:

the directions may change

Or they will repel and become opposite sides

6 0
2 years ago
The diagram shows a swinging pendulum.
pashok25 [27]

Answer:

A. The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving.

Explanation:

took the quiz on edge

8 0
3 years ago
Read 2 more answers
What is endurance? a). the ability to run faster b). a combination of balance and coordination c). how much you can stretch d).
Alex787 [66]

Answer:

D. the ability to exercise for longer periods of time

Explanation:

For example, when someone does endurance training, they are stretching their body's ability to do a certain exercise for longer times as opposed to increasing strength.

8 0
3 years ago
Other questions:
  • Donna stretched a spring to increase its length. Nearby in an electrical device, a positive charge attracted a negative charge.
    14·1 answer
  • g 0 g bullet is fired horizontally into a 1.20 kg wooden block resting on a horizontal surface. The coefficient of kinetic frict
    7·1 answer
  • John performs an experiment on an electric circuit. He increases the voltage from 25 volts to 50 volts while keeping the resista
    5·2 answers
  • How does and objects density determine whether the object will sink or float
    9·1 answer
  • A 70 kg hockey player traveling at 6 m/s collides directly with a 76 kg player traveling at -5.4 m/s. Which way do they go after
    14·1 answer
  • Two adjoining plane mirrors are separated by an angle of 100°. Light is incident on the first mirror at an angle of 70°. The lig
    14·2 answers
  • Suppose a ray of light traveling in a material with an index of refraction na reaches an interface with a material having an ind
    7·1 answer
  • When holes are drilled through the wall of a water tower, water will spurt out the greatest horozontal distance from the hole cl
    11·1 answer
  • What is drag? In what situations might it act on the force of gravity?
    9·2 answers
  • What parameters we control through a valve?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!