All categories

3 years ago

Describe an example of a physical change you might observe in your life

Physics

1 answer:

irinina [24]3 years ago

6 0

Answer:

Examples of physical changes are boiling, melting, freezing, and shredding. Many physical changes are reversible, if sufficient energy is supplied. The only way to reverse a chemical change is via another chemical reaction

Explanation:

hope this helps!

~mina-san

You might be interested in

During which segments is kinetic energy decreasing? A)1,2,3 B) 4,5 C)1,3,5 D)2,4

Nutka1998 [239]

Answer:

Explanation:

kinetic energy is energy an object has due to its movement. for instance, if someone was riding down a hill, when the motion of the bike begins to decrease so does the kinetic energy

3 0

3 years ago

Read 2 more answers

2) Calculate the gravitational potential energy that a parachutist has just as he

masya89 [10]

Answer:

The gravitational potential energy of the parachutist is 3,528,000 J

Explanation:

Gravitational Potential Energy

It's the energy stored in an object because of its height in a gravitational field.

It can be calculated with the equation:

U=m.g.h

Where:

m = mass of the object

h = height with respect to a fixed reference

g = acceleration of gravity, usually taken as $9.8 m/s^2$ .

The parachutist has a mass of m=120 kg and he jumps at a height of h= 3,000 m. Computing the gravitational potential energy:

U = 120 * 3,000 * 9.8

U = 3,528,000 J

The gravitational potential energy of the parachutist is 3,528,000 J

5 0

3 years ago

A 9.13e+3 kg railroad car is rolling at 3.15 m/s when a 4.20e+3 kg load of gravel is suddenly dropped in from directly above. Wh

Feliz [49]

Answer:

6.85 m/s

Explanation:

We can solve the problem by using the law of conservation of momentum.

In fact, since there are no external forces acting, the total momentum before and after must be conserved. So we can write:

$m_1 v_1 = m_2 v_2$

where

$m_1 = 9.13\cdot 10^3 kg$ is the initial mass of the car

$v_1 = 3.15 m/s$ is the initial speed of the car

$m_2 = 9.13\cdot 10^3 kg - 4.20\cdot 10^3 kg=4.93\cdot 10^3 kg$ is the mass of the car after the load of gravel is dropped

v2 is the final speed of the car

Solving for v2, we find

$v_2 = \frac{m_1 v_1}{m_2}=\frac{(9.13\cdot 10^3)(3.15 m/s)}{4.93\cdot 10^3}=6.85 m/s$

6 0

3 years ago

If you had 8 balls and 7 of them were a certain weight, and 1 of them was heavier, how could you find the heaviest ball. All the

dybincka [34]

Answer:

There are two method of comparing the balls 1) using a balance 2) by only 2 weighings.

Explanation:

There are two method of comparing the balls 1) using a balance 2) by only 2 weighings.

Make the following groups - --- (1,2,3),(4,5,6),(7,8)

Step 1. compare the Weigh (1,2,3) and (4,5,6)

there are 2 possible outcomes:

1---both the group are of same weight. and named as (Case A)

2--- one of the group is heavier than other and named as (Case B)

Step 2. Let examine both case

In Case A --in this case, now compare the weight of 7th and 8th ball. By this you have recognize the heavier ball by 2 weighing method.

In Case B -- considered the heaviest group (assume group (1,2,3) is heavy), from this group take randomly two ball and compare the their weight. out of these two ball, one is heavy else the third ball is.

7 0

3 years ago

URGENT!!!!! I WILL MARK U AS BRAINLIEST!!!!!!! A step-down transformer converts 120 V to 5 V in a phone charger. If the primary

Sloan [31]

Answer:

25 turns

Explanation:

The voltage ratio is the turns ratio:

secondary turns / primary turns = secondary voltage / primary voltage

secondary turns / 600 = 5/120

secondary turns = 600(5/120) = 25 . . . turns

The secondary coil has 25 turns.

6 0

3 years ago

Describe an example of a physical change you might observe in your life​

Describe an example of a physical change you might observe in your life