PHYSICS MIDDLE SCHOOL

How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns in the primary coil?

Answers

Answer 1
Answer:

350 + 507 = 3657 that would be your answer


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HIGH SCHOOL

BTW THIS A 2 QUESTION TEST THERE WILL BE 2 THINGS TO ANSWER William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron?
Iron is
A a compound
B an element
C a mixture

with one kind of atom that combines with oxygen from the air to form rust (iron oxide). Rust contains two types of atoms, which means it is
A a compound
B an element
C a mixture

Answers

William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron? 

Iron is (B) an element.


with one kind of atom that combines with oxygen from the air to form rust (iron oxide). Rust contains two types of atoms, which means it is 

(A) a compound 

Hope this helps. Have a nice day.

MIDDLE SCHOOL

A street ball whose mass is 2.0 kg is rolling at a rate of 2.8 m/so what is its momentum

Answers

Given that

mass of ball ( m) = 2 Kg,

velocity (v) = 2.8 m/s ,

Momentum of ball = ?

   We know that "Momentum is simply means, mass in motion

                 Mathematically,                        

                                  momentum (p) = m.v

                                                           = 2× 2.8

                                                           = 5.6 Kg.m/s

                                                =

HIGH SCHOOL

How much heat h1 is transferred to the skin by 25.0 g of steam onto the skin? the latent heat of vaporization for steam is l=2.256×106j/kg.express the heat transferred, in joules, to three significant figures?

Answers

The heat transferred by the steam to the skin is given by

where
m is the mass of the steam
is the latent heat of vaporization.

In our problem, the mass of the steam is (converting into kg)

while the latent heat of vaporization of the steam is

Substituting into the previous formula, we find the heat transferred to the skin:

HIGH SCHOOL

a 1.2x10^3 kilogram car is accelerated uniformly from 10. meters per second to 20 meters per second in 5.0 seconds. what is the magnitude of the net force acting on the car during this 5.0 second interval

Answers

Force , F = ma

F =  m(v - u)/t               

Where m = mass in kg, v= final velocity in m/s, u = initial velocity in m/s
t = time, Force is in Newton.

m= 1.2*10³ kg,  u = 10 m/s,  v = 20 m/s, t = 5s

F =  1.2*10³(20 - 10)/5

F = 2.4*10³ N = 2400 N


HIGH SCHOOL

Which of the following is an example of heat transfer through radiation? A. A pot of soup warming on a hot burner.

B. A crayon melting on a hot sidewalk.

C. Beach sand getting warmed by the sun.

D. An egg getting cooked in a pot of boiling water.

Answers


A). The hot burner is in contact wit the pot,
warming it with conduction.

B).  The hot sidewalk is in contact with the crayon,
melting it with conduction.

C).  The sun is not in contact with anything, and there is
no fluid to convect between it and the sand.  The only way
for the sun to transfer heat to the sand is with radiation.

D).  The boiling water is in contact with the egg,
warming it with conduction.
COLLEGE

A girl is running toward the front of a train at 10 m/s. If the train is going 75 m/s on the Southbound tracks, what is the speed of the train relative to the girl?

Answers

We can take as positive direction the direction of the train, and as negative direction the direction of the girl. The speed of the train relative to the girl will be given by the difference between the two velocities:

which means

Answer:

velocity of the train with respect to girl is 85 m/s

Explanation:

As we know that girl is moving towards the train in front of it with speed

also we know that the speed of the train towards the girl is

Now we know that relative velocity of the train with respect to girl is given as

here let say the velocity of train is positive while girl is running opposite to train so its velocity is negative

HIGH SCHOOL

It usually takes more force to start an object sliding than it does to keep an object sliding because static friction is usually _____greater _______________ than sliding friction.

Answers

The answer is already in the blank for, its was greater
MIDDLE SCHOOL

Definition of cloud formation in your own words

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Cloud formation is a process which various types of clouds are formed, generally involving adiabatic cooling of ascending moist air.
MIDDLE SCHOOL

State newton. three lows of motion​

Answers

Answer:Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. ... The third law states that for every action (force) in nature there is an equal and opposite reaction.

Explanation:

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