PHYSICS HIGH SCHOOL

A suitcase had a width of 55 cm. Which unit conversion fraction should you use to find the width in inches?A. 1 cm/2.54 in

B. 1 in/2.54 cm

C. 2.54 cm/1 in

D. 1 in/1 cm

Answers

Answer 1
Answer:

The answer is B.

When you multiply 55 cm by 1in/2.54 cm, the unit cm cancels leaving only in.

55 cm is thus 21.654 in.


Answer 2
Answer:

Answer:

B. (1 in)/(2.54 cm)

Explanation:

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1. When a motor is turned on, electrical energy is transformed to mechanical energy plus heat energy.True or False

2. The outward evidence for this transformation can be seen only in the mechanical motion of the motor.
True or False

3. What is true of the efficiency of this motor?
a. it is more than 100% efficient
b. it is 100% efficient
c. it is less than 100% efficient
d. none of the above

Answers

1.) The statement is true!... heat energy is also generated due to the presence of resistance in motor. Heat generated is given by, H=i²Rt( i = current, R is the resistance of the conductor and t is time). 2.) This statement is false because transformation takes place in electrical motor too due to presence of resistance. 3.) c.  it is less than 100% efficient. 

Answer:

1. True

2. False

3. c. it is less than 100% efficient

If you travel at 3 m/s for 12 seconds, how far did you travel?

Answers

Answer:

\boxed {\tt 36 \ meters }

Explanation:

We want to find how far was traveled, or the distance.

The formula for distance is:

d=s*t

where s is the speed and t is the time.

The speed is 3 meters per second and the time is 12 seconds.

s= 3 \ m/s \nt= 12 \ s

Substitute the values into the formula.

d= 3 \ m/s * 12 \ s

Multiply. Note that when multiply, the seconds, or s will cancel.

d= 3 \ m * 12

d= 36 \ m

d= 36 \ meters

The distance traveled was 36 meters.

Answer:

V=3 m/s

t=12 seconds

S=?

S=V×t

S=3×12

S=36meters

So distance you travel is 36meters.

An electron released by a radioactive nucleus that causes a neutron to change into a proton is called

Answers

the answer to this beta particle that causes a neutron to change into a proton so it is simple to see that me and al2006 see that the answer is beta particle.

Objects with greater mass have a weaker force of gravity between them.

True
False

Answers

False, more massive objects exert a stronger gravitational force.

Two cylindrical resistors are made from same material and have the same length. When connected across the same battery, one dissipates twice as much power as the other. How do their diameters compare ?

Answers

Answer:

(d_2)/(d_1) = \sqrt2 = 1.41

Explanation:

As resistor is connected to the battery of constant EMF then the power across the resistor is given as

P = (E^2)/(R)

now if two resistors are made up of same material and of same length then due to different cross sectional area they both have different resistance

Due to different resistance they both will have different power

Since power is inversely depends on the resistance

So if the power is twice that of the other then the resistance must be half

so we have

R_1 = \rho (L)/(A_1)

R_2 = \rho(L)/(A_2)

since one resistance is half that of other resistance

So the area of one must be twice that of other

so we have

(A_2)/(A_1) = 2

(\pi d_2^2)/(\pi d_1^2) = 2

d_2 = 1.41 d_1

Cations have fewer _____ than _____.a. neutrons; protons
b. protons; neutrons
c. electrons; protons
d. protons; electrons

Answers

Answer:

C.Electrons,protons.

Explanation:

Cations:

 When metal loos it electrons then it will form cations.

Ex:Na^(+1)

Anion:

When metal gain electron then it will from anions.

Ex:F^(-1)

So from above we can say that ,the cations have fewer electrons than protons.Protons is also called as positive charged ions and electron are also called negatively charge ions.

SO the option is C is correct.
Cations are positively charged ions. And for positive charged ions, it means the positive charges, protons, are more than the negative charges, the electrons.

Therefore Cations have fewer electrons than protons.

So the answer is:    c. electrons; protons. 
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