All categories

3 years ago

Hi! I really need help on these questions, it would be great if you can answer them!

Physics

2 answers:

Nikitich [7]3 years ago

6 0

1: Equilibrium

[] When two forces are equal in opposite directions, they are in a state of equilibrium

2: Friction

[] It can be hard to sometimes slide a paper across a table, roll a car across the ground, etc etc. This is because of a force called friction which resists motion

3: Displacement

[] Work is only "done" when the object or surroundings are having movement, or in motion, and this creates displacement

4: Force

[] A force is a push/pull in any direction, this is a simple definition so not much can be added.

5: Inertia

[] Inertia is a force that likes to remain unchanged, or without movement

6: Effort

[] "Meg is holding up weight without movement. She hasn't done any work since it did not move, but is tired. Why?" Effort! She still put in effort even though no "work" happened

7: Work

[] Force times displacement is the equation for work

8: Motion

[] Look back to #3, when there is motion we can tell work is done

Have a nice day!

I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

Ilya [14]3 years ago

5 0

Equilibrium, friction, displacement, force, inertia

You might be interested in

Tracy makes a list of energy transformations that occur as an engine runs to power a car. 1. chemical energy transforms into the

alex41 [277]

Transformation 3 should Tracy removed from the list. Chemical energy transforms into gravitational potential energy.

<h3> What is the law of conservation of energy?</h3>

According to the Law of Conservation of Energy, energy can neither be created nor destroyed, but it can be transferred from one form to another.

The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.

Transformations that occur as an engine runs to power a car is;

1. Chemical energy of fuel transforms into thermal energy.

2. Thermal energy transforms into electrical energy used to lighten the bulb in a car.

3. Thermal energy transforms into kinetic energy to help to run the car.

Chemical energy transforms into gravitational potential energy is the incorrect energy transformation.

Hence, transformation 3 should Tracy removed from the list.

To learn more about the law of conservation of energy, refer to brainly.com/question/2137260.

#SPJ1

8 0

2 years ago

.A 0.2-kg aluminum plate, initially at 20°C, slides down a 15-m-long surface, inclined at a 30 angle to the horizontal. The forc

Ainat [17]

To solve this problem, it is necessary to apply the concepts related to Work according to the Force and distance, as well as the concepts related to energy lost-or gained-by heat. Mathematically the energy corresponding to heat is given as:

$Q = mC_p(\Delta T)$

Where,

m = mass

$C_p$ = Specific heat

$\Delta T$ = Change in Temperature

At the same time the Work made by the Force and the distance is given as:

$W = F*d \rightarrow W=mg*d$

As the force is applied at an angle of 30 degrees, the efficient component would be given by the vertical then the work / energy would be determined as:

$W = mg*dsin(30)$

$W = (15m)(0.2kg)(9.81)(sin30)$

$W = 13.24J$

Now this energy is used to heat the aluminum. We can find the change at the temperature as follow:

$Q = mC_p(\Delta T)$

$13.24 = (0.2)(900)(\Delta T)$

$\Delta T = 0.0736 \°C$

Therefore the correct answer is B.

7 0

3 years ago

For Valentine’s Day Sally received a helium-filled balloon at a party. On returning home she accidently left the balloon in the

gayaneshka [121]

Answer:

The helium molecules move closer together when it's cold causing the balloon to deflate

Explanation:

5 0

3 years ago

Which of the following is the reason that a fixed pulley makes work easier?

kherson [118]

<u>Answer</u>

A fixed pulley is one of many simple machines that can make work easier. In the fixed pulley system, we pull down on one side of the rope and the other side goes up. Here the pulley can change the direction of force on a rope or belt that moves along its circumference.
we use the same amount of force to pull down as we lift the toy ourselves.

8 0

3 years ago

George walks to a friend's house. He walks 750 meters North, then realizes he walked too far. He turns around and walks 250 mete

Genrish500 [490]

Answer:

76.9 m/s

Explanation:

total distance travelled is 750m + 250m = 1000m

the total time taken is 13 seconds.

1000m/13s = 76.9 m/s (1dp)

8 0

3 years ago