PLEASE HELP I DONT WANT TO FAIL I will vote your answer 5 stars of you help!!

Answer:

needle -attract

wooden spoon -repel

nails -attract

safety pins -attract

paper -repel

Explanation:

Answer: a. 1200J b. 600W c. 20m/s

Explanation: W = Fxcos

F = 300, x=4, direction of force is = to direction of object so cos(0) = 1

a) 300*4 = 1200

b) P = W/t

1200/2 = 600W

c) vf^2 = vi^2 + 2ax

vi = 0, x = 4, a= 300/6

vf^2 = 2(50)(4)

vf^2 = 400

vf= 20m/s

Answer:

The mass of a rolling ball with kinetic energy of 18 joules and velocity of 3m/s is 4kg.

Explanation:

HOW TO CALCULATE MASS?

The mass of a moving object can be calculated by using the following expression:

K.E = ½ mv²

Where;

K.E = kinetic energy (Joules)

m = mass (kg)

v = velocity (m/s)

According to this question, rolling ball has 18 joules of kinetic energy and is rolling at 3m/s. The mass is calculated as follows:

18 = ½ × m × 3²

18 = ½ × 9m

36 = 9m

m = 4kg

Therefore, the mass of a rolling ball with kinetic energy of 18 joules and velocity of 3m/s is 4kg.

Answer:

By friction,by contact,by Electrostatic induction

Explanation:

By friction:This is the process whereby electric charges are produced when two surfaces move over another

By Contact :This is when energy is produced when two bodies come in contact with each other

By electrostatic induction: When a charged object is brought closer to another object (not touched), the original object doesn't lose any charge and the other object gets charged.

hope this helps

Explanation:

what is the force

ican't under stand these question

These two objects are experienced different forces and the object which experiences the same change in momentum but over a shorter period of time will experience more force than the other object.

To know more about the dependance of force on momentum and time, we need to know more about force and how it works.

Thus, we can conclude that between these two objects, one, who experiences the same change in momentum for shorter period of time, will experience more force than other.

Learn more about force here:

https://brainly.com/question/12785175

#SPJ2

The moon rotates round Earth, we see it as crescent moon.Hence, I agree with the initial student.

Generally, due to the fact he rightly stated  that the positions of the Earth, Sun and moon continues on altering consistently due to the motion of moon round Earth.

Now, when the moon comes in between the Sun and the Earth about 1/2 component of the moon receives sunlight.

Similarly, as the moon rotates round Earth, a Earth will see the Sun-rays on the Moon coming from distinct angles and when solely a small element of the moon is illuminated via sunlight, we see it as crescent moon.

Therefore,I agree with the initial student

More on Earth

https://brainly.com/question/24878669

F = G.m₁m₂/r²

r² = G.m₁m₂/F

r² = (6.67 x 10⁻¹¹ x 70 x 50) / (5.8 x 10⁻¹¹)

r² = 4025

r = 63.44 m

Answer:

0.44 sec

Explanation:

k = 100 N/m, m = 0.50 kg

Period

Answer:

Turning off your lights will also help reduce the use of non-renewable resources that are harmful to the environment. You can turn off the lights during the day especially if you don't need them. You can also turn off your appliances to help reduce your carbon footprint and help save the planet.

air and empty space.

Scientists think the most likely reason is that it was heated by tidal forces from Jupiter.

This is known as the gravitational effect that stretches an object along the line towards the center of mass of another object as a result of gradient in gravitational field from the other body.

The moon Ganymede having a magnetic field, indicating that its interior was at least partly melted and warm was however as a result of tidal forces from Jupiter which caused the heating.

Read more about Tidal forces here  https://brainly.com/question/6762160

An7=21=3

Explanation:

becaue 7 time 3 =21

Answer:

the electron volt (eV) is a unit of energy.

Answer:

A wedge can split an object apart

A  lever is the seesaw

inclined plane is a ramp

a pulley can reduce the amount of friction

wheel and axle is the rope one

Explanation:

Following are the matches:

Simple machines are basic mechanical devices that can help make work easier by reducing the amount of force or effort needed to do a task. They are usually the most basic forms of machines, often made up of only one or two parts, and are used to change the direction or magnitude of a force.

There are six types of simple machines:

Simple machines are the building blocks for more complex machines, and they are used in many everyday devices and equipment to make work easier and more efficient.

Learn more about simple machines, here:

https://brainly.com/question/29752709

#SPJ2

Answer:

d

Explanation:

because it also depends upon accleration acting upon it

Electric potential is the amount of work needed to move a unit charge from a point to a specific point against an electric field. Hence the value of a charge will be 7.7 ×10⁻⁵.

Electric potential is the amount of work needed to move a unit charge from a point to a specific point against an electric field.

However, the electric potential energy of a charge is given by

E=qV

q is the charge

V is the electric potential

E is the electric potential energy

The electric charge value if found by dividing the electric potential energy with the electric potential

[tex]\rm q= \frac{E}{V} \\\\ \rm q= \frac{0.025}{325} \\\\\rm q= 7.7\times 10^{-5} \;C[/tex]

Hence the value of a charge will be 7.7 ×10⁻⁵.

To learn more about electric potential energy refer to the link.

https://brainly.com/question/12707371

The gravitational force is s type of force that has the ability to attract any two objects with mass. The mass of the satellite will be 450 kg.

The gravitational force is s type of force that has the ability to attract any two objects with mass. Gravitational force tries to pull two masses towards each other.

The given data in the problem is;

F is the gravitational force = 324 N,

m₁ is the mass of the moon = 7.3 * 10²²kg

r is the distance between the moon and satellite  = 2.6 * 10 ⁶m.

m₂ is the mass of satelite =?

G is the gravitational constant = 6.67×10⁻¹¹

The gravitational force is given by

[tex]\rm F= \frac{Gm_1m_2}{r^2} \\\\ \rm m_2 = \frac{Fr^2}{Gm_1} \\\\ \rm m_2 = \frac{324 \times (2.6\times 10^6)^2}{6.67\times 10^{-11} \times 7.3 \times 10^22 } \\\\ \rm m_2= 450 kg[/tex]

Hence the mass of the satellite will be 450 kg.

To learn more about the gravitational force refer to the link;

https://brainly.com/question/24783651

Answer:

The laws of thermodynamics define a group of physical quantities, such as temperature, energy, and entropy, that characterize thermodynamic systems in thermodynamic equilibrium.

Answer:

A car travelling at a speed of 45 m/h takes 20 minutes to reach its destination.

We have to find the distance travelled by the car .

Changing the unit of time into hour

Time = 20/60 hour

Time = 2/3 hour

Now, let's calculate the distance travelled by the car .

[tex] \bf \: Distance \: travelled \: = Speed \: \times Time[/tex]

Put the value we get

[tex] \sf \dashrightarrow \ \: Distance \: travelled \: = 45 \times \frac{2}{3} \\ \\ \sf \dashrightarrow \ \: Distance \: travelled \: = \cancel{45} \: \times \frac{2}{ \cancel3} \\ \\ \sf \dashrightarrow \ \: Distance \: travelled \: = 15 \times 2 \\ \\ \sf \dashrightarrow \ \: Distance \: travelled \: = 30km \: [/tex]

So, the distance travelled by the car is 30Km .

The car has travelled a distance of 15 m

Since distance, d = vt where

Now, the car travels at a speed of 45 m/h in 20 minutes.

So,

Since d = vt,

substituting the values of the variables into the equation, we have

d = vt

d = 0.75 m/min × 20 min

d = 15 m

So, the car has travelled a distance of 15 m

Learn more about distance travelled by car here:

https://brainly.com/question/25855577

When a body is thrown downwards, it falls freely under gravity.

The question is incomplete as the values are missing but I will try to help you the much I can. We must note that the acceleration of a body refers to the rate at which its velocity changes per unit time.

When an object is thrown down from a height. It gains speed due to acceleration due to gravity which acts on the body as it falls freely.

Learn more about acceleration: https://brainly.com/question/1257593

Answer:

1000

1000

1000

0.580

0.580

0.580

Explanation:

Answer:

Magnetism surrounding the wire draws the needle toward the wire.

Explanation:

The wire itself has it's own magnetism also, that's why, if you put a compass near it, then the compass will get confused and point the wrong direction.

Thanks!

MiniMeteorologist

The force needed to move a body in a curved way is understood as centripetal force. The centripetal force on Miguel will be 224 N.

The force needed to move a body in a curved way is understood as centripetal force. This is a force that can be sensed from both the fixed frame and the spinning body's frame of concern.

The direction of centripetal force is always in the path of the center of the course.

The given data in the problem is

v is the tangential speed = 3.50 m/sec.

r is the radius of circle= 0. 600 m

m is mass of Miguel = 11. 0 kg

[tex]F_c[/tex] is the centripetal force on Miguel=?

[tex]\rm F_C=\frac{mv^2}{r} \\\\\ F_C=\frac{11 \times (3.5)^2^}{0.6} \\\\ \rm F_C= 224.58 N[/tex]

Hence the centripetal force on Miguel will be 224 N.

To learn more about the centripetal force refer to the link;

https://brainly.com/question/10596517

Answer:

thermal energy

Explanation:

Answer:

D. Thermal Energy

Explanation:

Hope it helps! Have a great day!

Sandra~

People find this acceptable because it is common to use mass and weight as synonyms even if they are not.

In physics, mass refers to the amount of matter, due to this, mass is often measured in:

On the other hand, weight considers gravity or the force gravity exerts on an object, and due to this it is measured in newtons.

Even if weight and mass are different, people often use the word "weight" to refer to the mass, that is why statements such as the above are acceptable. However, if you are a physicist this would be incorrect.

Learn more about weight in: https://brainly.com/question/23312072

Answer:

The object's potential energy will be the same.

Explanation:

As long as the object hasn't been moved by itself, the potential energy will not change

Answer:

Homeostasis maintains optimal conditions for enzyme action throughout the body, as well as all cell functions. It is the maintenance of a constant internal environment despite changes in internal and external conditions.

Answer:

1) Are always conservative

Explanation:

Elastic forces are always conservative.

Hope it helps you.

please mark as the brainliest answer.