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
klemol [59]
3 years ago
7

Which of the following is an example of a chemical change?

Physics
1 answer:
ss7ja [257]3 years ago
6 0

Answer:

Burning Paper

Explanation:

This is a chemical reaction, because new substances are formed

You might be interested in
How do you find the number of neutrons
sammy [17]

the mass number minus the atomic number

8 0
3 years ago
A blue box and green box are sitting on a table not moving. A student exerts the same force on both boxes and observes how long
dem82 [27]

Answer:

2 possible answers. 1. The green box is heavier. or 2nd. The green box has bigger friction than blue box.

Those should be the 2 main explanations. There probably are other options

5 0
3 years ago
Read 2 more answers
Ultraviolet light from a distant star is traveling at 3.0 × 108 m/s. how long will it take for the light to reach earth if it mu
castortr0y [4]

Given speed and the distance that must be covered, the time it will take the ultraviolet light to reach the earth is 3.7 × 10⁴ hours.

<h3>What is Speed?</h3>

Speed is simply referred to as distance traveled per unit time.

Mathematically, Speed = Distance ÷ time.

Given the data in the question;

  • Speed of the Ultraviolet light c = 3.0 × 10⁸m/s = 1.08 × 10⁹km/h
  • Distance it must cover d = 4.0 × 10¹³km
  • Time elapsed t = ?

We substitute our given values into the expression above.

Speed = Distance ÷ time

1.08 × 10⁹km/h = 4.0 × 10¹³km ÷ t

t = 4.0 × 10¹³km ÷ 1.08 × 10⁹km/h

t = 3.7 × 10⁴ hrs

Therefore, given speed and the distance that must be covered, the time it will take the ultraviolet light to reach the earth is 3.7 × 10⁴ hours.

Learn more about speed here: brainly.com/question/7359669

#SPJ4

5 0
2 years ago
In a research facility, a person lies on a horizontal platform which floats on a film of air. When the person's heart beats, it
anastassius [24]

Answer: 3.48g

Explanation:

here, we will be using conservation of momentum to solve the problem. i.e the total momentum remains unchanged, unless an external force acts on the system. We'll in thus question, there is no external force acting in the system.

Remember, momentum = mass * velocity, then

mass of blood * velocity of blood = combined mass of subject and pallet * velocity of subject and pallet

Velocity of blood = 56.5cm = 0.565m

mass of blood * 0.565 = 54kg * (0.000063/0.160)

mass of blood * 0.565 = 54 * 0.00039375

mass of blood * 0.565 = 0.001969

mass of blood = 0.00348kg

Thus, the mass of blood that leaves the heart is 3.48g

7 0
3 years ago
Read 2 more answers
An archer releases an arrow toward a target. The arrow travels 170 meters in 2 seconds. What is the speed of the arrow?
Anastaziya [24]

Answer:

if its arrow from netflix it will never miss if its robin hood he will get your wallet count if its eagle eye from avengers he will never miss either but will get you with a tricky arrow

8 0
3 years ago
Other questions:
  • Mary just received a traffic ticket but decided it is not worth being upset about. Mary just made a__________.
    15·1 answer
  • A cart starts from rest and accelerates at 4.0 m/s2 for 5.0 s, then maintains that velocity for 10 s, and then decelerates at th
    8·1 answer
  • If the gravitational forces exist between all objects in the universe why aren't people affected by the gravitational force exer
    9·1 answer
  • When an automobile rolls on pavement, the instantaneous center of one of its wheels is located on the wheel axle. True o False
    9·1 answer
  • Height of a artificial satelite​
    12·1 answer
  • A ball is thrown horizontally from the top of a building at 2 m/s. It takes 3 seconds to reach the ground. How far did the ball
    9·1 answer
  • . A car going 50 m/s accelerates to pass a truck. Five seconds later the car is going 80m/s. Calculate the acceleration of the c
    12·1 answer
  • 500 coulombs of charge flow through a bulb for 25 seconds. Calculate the current trough the bulb.
    14·1 answer
  • A 65 kg woman is inside an elevator. (A) Calculate her apparent weight (normal force) in Newtons if the elevator moves at consta
    14·1 answer
  • Chuyển động thẳng đều là gì
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!