Can someone help me?

Answer:

W = 3900 J

Explanation:

Given that,

Electrical energy supplied = 7000 J

Gain in gravitational potential energy = 3100 J

We need to find the amount of wasted energy. Let it is W. So,

W = 7000 J - 3100 J

= 3900 J

So, the amount of wasted energy by the motor is 3900 J.

Answer:b

Explanation:

took test, might be wrong

Answer:

C ) Extreme temperature differences in summer and winter

Explanation:

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Answer:

B

Explanation:

Answer:

Machine; greater; thermal.

Explanation:

Conduction can be defined as the transfer of electric charge or thermal energy as a result of the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

Mathematically, the efficiency of a machine is given by the formula;

[tex] Efficiency = \frac {Mechanical \; advantage}{Velocity \; ratio} * 100 [/tex]

Hence, the lower the efficiency of a machine, the greater the percentage of energy that is degraded to thermal energy. We experience inefficiency in machines due to the fact that energy are being transformed or converted from one form to another.

Answer:

The gas will change to a liquid

Explanation:

Basically condensation happens

Answer:

Due to reduced friction of a polished ,smooth slide, children can slide down easily. When oil or grease is applied between the moving parts of a machine ,a thin layer of oil or grease is formed between the two rubbing surfaces. ... This friction is reduced and movement becomes smooth.

Explanation:

please give me brainlist and follow

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In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. One can also speak of motion of images, shapes, and boundaries.

Movement of any object from one position to another position with respect to the observer is called as Motion. Motion Along a Straight Line: When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway.

In physics, motion is the change in position of an object with respect to its surroundings in a given interval of time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, and speed. An object's motion cannot change unless it is acted upon by a force.

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Hope It Helps!

Answer:

3MgCl2 has 9 atoms.

Explanation:

The Element Magnesium (Mg) has 3 atoms.

The Element Chloride (Cl) has 6 attoms.

Their fore 6 + 3 is 9 of course. 3MgCl2 has 9 atoms.

BTW: 3MgCl2 is a molecular compound as well as H2O and CO2.

Answer:

i think its 644

Explanation:

Answer:

Answer is D. a north pole is near a south pole

Explanation:

Hope this helps!! :D

THe question is missing parts. Here is the complete question.

Which force below does the most work? All three displacements are the same.

A. The 10 N force

B. The 8 N force

C. The 6 N force

D. They all do the same work

note: sin60° = 0.87

        cos60° = 0.5

Answer: C. The 6 N force

Explanation: Work (τ) is the transfer of energy to or from a system by moving an object.

Work is dependent of the force we applied to the object, the displacement it creates and the angle between the force and the displacement. In other words:

[tex]\tau = F.d.cos \theta[/tex]

and its unit is joule [J].

For the 10 N force, angle is 90°. Cosine of 90° is 0. Therefore:

[tex]\tau = 10.d.cos 90[/tex]

[tex]\tau = 0[/tex]

For the 8 N force, angle is 60°. Then:

[tex]\tau = 8.d.cos 60[/tex]

[tex]\tau = 8d(0.5)[/tex]

[tex]\tau = 4d[/tex]

For the 6 N force, angle is 0, because vectors displacement and force are pointing to the same direction:

[tex]\tau = 6.d.cos 0[/tex]

[tex]\tau=6d(1)[/tex]

[tex]\tau=[/tex] 6d

Comparing the work done, the force that does the most work is force 6N.

Answer:

3

Explanation:

Trust me its the right answer

Answer:

Fricción.

Explicación:

Caminando con otro compañero al mismo tiempo y al mismo ritmo, el movimiento se produce debido a la fricción del suelo y la suela de los zapatos porque la fricción es la fuerza que ayuda en el movimiento de los objetos de un lugar a otro. Si no hay fricción entre el suelo y la suela de los zapatos, no podemos dar un paso por lo que podemos decir que la fricción nos mueve hacia adelante.

Answer:

cellular respiration

Explanation:

Answer:

Displacement method of volume measurement is no suitable

Explanation:

Displacement method of volume measurement is no suitable for the objects that do not get immersed into the water completely because of the hindrance in accuracy of the measurement.

Answer:A

Explanation: it’s a covalent bond plus i just took mines

Answer:

Pressure increases

Explanation:

"Gay Lussac's Law - states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. If you heat a gas you give the molecules more energy so they move faster. This means more impacts on the walls of the container and an increase in the pressure."

Answer:

The first factor is the amount of charge on each object. The greater the charge, the greater the electric force. The second factor is the distance between the charges. The closer together the charges are, the greater the electric force is.

Explanation:

Answer:

Explanation:

Yes , their displacement may be equal .

Suppose the displacement is AB where A is starting point and B is end point .

The car is covering the distance AB by going from A to B on straight line . On the other hand plane goes from A to C , then from C to D and then from D to B . In this way plane reaches B from A on a different path which is longer than path of the car . In the second case also displacement of plane is AB . In the second case distance covered is longer but displacement is same that is AB .

Explanation:

 a couple is a system of forces with a resultant moment but no resultant force. A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass. 

Answer:

The speed is 1.35 m/s

Explanation:

(m1+m2) vi= m1+m2v2

(50+1.5) (3.5)=50 (5+v2) +1.5 v2

180.25= 250+ 51.5 v2

180.25- 250+ 51.5 v2

-69.75= 51.5 v2

v2= -1.35 m

answer:

cardiovascular endurance

muscular strenght

muscular endurance

body composition

flexibility

Explanation:

hope it helps(◍•ᴗ•◍)❤

Answer:

Yes please

Explanation:

Answer:

relative age

Explanation:

i remember this test

Answer:

c. 300 J

Explanation:

Given

Power (p) = 10 W

Time (t) = 0.5 minutes = 30 seconds

Energy (E) = ?

We know

p = E/t

10 = E / 30

E = 300 Joule