PHYSICS HIGH SCHOOL

How many electrons does an atom with 8 protons and no charge have? 7
9
5
8

please help

Answers

Related Questions

A material that provides little or no resistance to the flow of electric current is called a(an) A. circuit / B. conductor / C. insulator / D. resistor.
Which type of electromagnetic radiation cannot be focused? A. Gamma rays   B. X-rays   C. Ultraviolet   D. Infrared
The potential difference across wire is 75V and its electric resistance is 30Ω. Find out the electric current through the wire.
Two students grab a slinky and start waving it up and down. A third student counts the number of waves that pass by every second and measures the distance between the wave peaks. This data is recorded and a graph is made to show the results.Determine the velocity of the wave produced. A) 1 m/s B) 2 m/s C) 3 m/s D) 6 m/s Graph Attached*
A crane has an arm length of 20m inclined at 30deg with the vertical. It carries a container of mass of 1 ton suspended from the top end of the arm. Find the torque produced by the gravitational force on the container about the point where the arm is fixed to the crane. Given: 1 ton = 1000 kg; neglect the weight of the arm. Hint: take the force and perpendicular distance from the point where the arm is fixed to the crane. Note: Express your answer in whole number. No unit is required for the final answer. Set your calculator in radians.

A long solenoid has 1400 turns per meter of length, and it carries a current of 4.9 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of 90.0˚ with respect to the axis of the solenoid. The coil consists of 42 turns, has an area of 1.2 × 10-3 m2, and carries a current of 0.45 A. Find the torque exerted on the coil.

Answers

Answer:

The torque on the coil is 1.955* 10^(- 4)\ N-m

Solution:

No. of turns per meter length, n = 1400 turns\m

Current, I = 4.9 A

Angle, \theta = 90.0^(\circ)

No. of turns of coil, N = 42 turns

Area, A = 1.2* 10^(- 3)m^(2)

Current in the coil, I' = 0.45 A

Now,

To calculate the exerted torque on the coil:

The magnetic field, B produced inside the coil is given by:

B = n\mu_(o)I

B = 1400* 4\pi times 10^(- 7)* 4.9 = 8.62* 10^(- 3)\ T

Now, the torque exerted is given by:

\tau = I'NAB

\tau = 0.45* 42* 1.2* 10^(- 3)* 8.62* 10^(- 3) = 1.955* 10^(- 4)\ N-m

Answer:

T\approx 1.95* 10^(-4) N.m

Explanation:

Given:

A long solenoid having

no. of turns per meter, n =1400

current, I = 4.9 A

A small coil of wire placed inside the solenoid

angle of orientation with respect to the axis of the solenoid, \theta=90\degree°

no. of turns in the coil, N = 42

area of the coil, a= 1.2* 10^(-3) m^2

current in the coil, i =0.45 A

We have for torque:

T=n.i.a.B. sin\theta.......................(1)

∵B=\mu_(0) .n.I................................(2)

where:

B= magnetic field

\mu_0=The permeability of free space =4\pi*10^(-7) T.m.A^(-1)

Substitute B from eq. (2) into eq. (1) we have:

T=n.i.a.(\mu_0.N.I ).sin\theta

putting the respective values in above eq.

T=42* 0.45* 1.2* 10^(-3)* 4\pi*10^(-7) * 1400* 4.9* sin 90^(\circ)

T\approx 1.95* 10^(-4) N.m

What energy does a hamburger have when you eat it

Answers

I'm not sure what you mean...

When you eat a hamburger, you digest it and it turn into energy for your body. This is a chemical reaction

Also, a hamburger is 354 calories. Here is a pic of the nutrition facts:
it gives you chemical energy.

Two objects are moving at equal speed along a level, frictionless surface. the second object has twice the mass of the first object. they both slide up the same frictionless incline plane. which object rises to a greater height?

Answers

Answer:

They both rises to same height.

Explanation:

When an object is sliding up in friction less surface than according to conservation of energy its potential energy will be converted into kinetic energy.

mgH=(1)/(2)mv^(2)\n v=√(2gH)

Here, m is the mass, v is the velocity, g is the acceleration due to gravity and H is the height.

Here the height is independent on the mass of an object and its only depend on velocity.

Now according to the question, two objects have same velocity but they have different masses.

Therefore, they rises to the same height because  height will not change with mass.

Both objects rise to the same height

\texttt{ }

Further explanation

Let's recall Kinetic Energy Formula as follows:

\large {\boxed{Ek = (1)/(2)mv^2} }

Ek = Kinetic Energy ( Joule )

m = mass of the object ( kg )

v = speed of the object ( m/s )

Let us now tackle the problem !

\texttt{ }

Given:

initial speed of first object = initial speed of second object = v

final speed of first object = final speed of second object = 0

mass of first object = m

mass of second object = 2m

Asked:

height = H = ?

Solution:

We will use Conservation of Energy to solve this problem:

Ep_1 + Ek_1 = Ep_2 + Ek_2

0 + (1)/(2)mv^2 = mgH + 0

(1)/(2)v^2 = gH

v^2 = 2gH

\boxed {H = (v^2)/(2g)}

\texttt{ }

H_1 : H_2 = (v_1^2)/(2g) : (v_2^2)/(2g)

H_1 : H_2 = v_1^2 : v_2^2

H_1 : H_2 = v^2 : v^2

H_1 : H_2 = 1 : 1

\boxed{ H_1 = H_2 }

\texttt{ }

Conclusion:

Both objects rise to the same height

\texttt{ }

Learn more

\texttt{ }

Answer details

Grade: High School

Subject: Physics

Chapter: Energy

The change of energy from one form to another results in _____.

Answers

the spreading out of energy due to heat flow

A stone is dropped from a cliff. What will be its speed when it was fallen 100 m?

Answers

Answer:

final velocity will be44.72m/s

Explanation:

HEIGHT=h=100m

vi=0m/s

vf=?

g=10m/s²

by using third equation of motion for bodies under gravity

2gh=(vf)²-(vi)²

evaluating the formula

2(10m/s²)(100m)=vf²-(0m/s)²

2000m²/s²=vf²

√2000m²/s²=√vf²

44.72m/s=vf

Answer:

44.2m/s

Explanation:

2gs = vf*2 - vi*2

2 x 9.8 x 100 = vf*2 - 0

1960 = vf*2

vf = 44.2 m/s

What simple science equation explains the relationship between mass, weight and gravity.

Answers

The force of gravity is the force with which massively large objects such as the earth attracts another object towards itself. All objects of the earth exert a gravity that is directed towards the center of the earth. Therefore, the force of gravity of the earth is equal to the mass of the object times acceleration due to gravity and also equal to the weight of the object.

 

F = ma

since F = W

W = ma

Answer:

Force =  Mass x Acceleration

Explanation:

Force - The units of force = Newtons( N)

Mass - The units of mass = Kilograms (Kg)

Acceleration - Units of acceleration = (m/s2)
Other Questions
How do you solve this question. I found the first part but don't know how to find distance
A racecar is traveling in uniform circular motion around a racetrack. What happens to the centripetal acceleration of the car if the speed is doubled and the radius of the circle remains constant?
What does the kinetic theory explain?Heat is due to temperature.Heat is due to potential energy.Heat is due to the motion of molecules.Heat is due to Pascal´s principle.
What causes light to bend when it moves from one transparent medium to another?a change in amplitude a change in color a change in frequency a change in speed