PHYSICS HIGH SCHOOL

One of your delivery trucks traveled 1,200 miles on 55 gallons of gas. How many miles per gallon did the truck get? (Round off your answer to the nearest hundredth.) A. 45.84
B. 21.81
C. 45.83
D. 21.82

Answers

Answer 1
Answer: The word "Per" means divide

"miles per gallon" is the same as "miles / gallon"

The truck went 1,200 miles
on 55 gallons

1,200 ÷ 55 = 21.81
Answer 2
Answer: Simply divide the two quantities to attain the correct unit.

1200 miles/55 gallons = 21.82 miles/gallon
The answer is D.

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The expression that relates emf, potential, current, and resistance is Ohm's law.True or
False

Answers

Answer:

This expression is True

Since the Ohm's Law "states that the current )I) through a material between two points is proportional to the voltage across the two points." and i defined by this formula:

V = IR

Where V represent the voltage and it's a value related to the emf and the potential

I represent the current

R represent the resistance.

And for this case we have an expression for this case relating the emf , potential, current and resistance

Explanation:

This expression is True

Since the Ohm's Law "states that the current )I) through a material between two points is proportional to the voltage across the two points." and i defined by this formula:

V = IR

Where V represent the voltage and it's a value related to the emf and the potential

I represent the current

R represent the resistance.

And for this case we have an expression for this case relating the emf , potential, current and resistance

Ohms law:
V = IR The relationship between electrical resistance, current, and voltage is defined by the mathematical relationship V= IR and is referred to as Ohm's law. In this equation "V" stands for voltage, measured in volts, "I" stands for current, measured in amperes, and "R" stands for resistance, measured in Ohms (Ω ).Common sources of voltage in circuits may be chemical cells (a battery is a combinations of cells) and generators. Sources of electrical resistance in circuits may include resistors, light bulb filaments, wire conductors and other electric devices. When solving Ohm's law problems you are expected to solve for any unknown variable.
Example: Determine the voltage of the circuit shown below in diagram "A".Diagram A In this circuit we are given the current from the ammeter .2A. We also can determine the resistance. Since this is a series circuit the total resistance is the sum of the resistances of L1 and L2, 70Ω . We set the problem up and solve it like this.
V=IR
V=.2A 70Ω
V= 14VThe answer is 14V

How much work is required to move3.0 coulombs of electric charge a distance of
0.010 meter through a potential difference of
9.0 volts?
(1) 2.7 × 10^3 J (3) 3.0 J
(2) 27 J (4) 3.0 × 10^−2 J

Answers

So we want to know how much work is needed to move a charge Q=3C for a distance r=0.01m trough a potencial difference U=9V. Work of electric potential is defined as W=Q*U and we can now simply put in the numbers. We get: W=3C*9V=27J. So the correct answer is (2) 27J.

Coulomb's law states that the force F of attraction between two oppositely charged particles varies jointly as the magnitude of their electrical charges q1 and q2 and inversely as the square of the distance d between the particles. Find the effect on F of doubling q1 and q2 and halving the distance between them.

Answers

Answer: Force F will be one-sixteenth of the new force when the charges are doubled and distance halved

Explanation:

Let the charges be q1 and q2 and the distance between the charges be 'd'

Mathematical representation of coulombs law will be;

F1=kq1q2/d²...(1)

Where k is the electrostatic constant.

If q1 and q2 is doubled and the distance halved, we will have;

F2 = k(2q1)(2q2)/(d/2)²

F2 = 4kq1q2/(d²/4)

F2 = 16kq1q2/d²...(2)

Dividing equation 1 by 2

F1/F2 = kq1q2/d² ÷ 16kq1q2/d²

F1/F2 = kq1q2/d² × d²/16kq1q2

F1/F2 = 1/16

F1 = 1/16F2

This shows that the force F will be one-sixteenth of the new force when the charges are doubled and distance halved

Which reaction is a single replacement reaction?? A. 2H2+O2-2H20

B. 2H202-2H20+O2

C. KOH+HCI+H2O

D. Cu+ 2AgNO3- 2Ag +Cu(NO3)2

Answers



Cu + 2AgNO3 → 2Ag + Cu(NO3)2

"Light travels at the rate of 300,000 kilometers per second in a vacuum." Which of these statements is correct about this law? a. It is a fact in nature which cannot be tested.


b. It is a theory which is not supported by data.


c. It is an observation which cannot be explained.


d. It is a description which does not work under similar conditions.

Answers

Answer:

D. It is a description which does not work under similar conditions.

Explanation:

I not very sure, but I don't think the other are correct...

Answer:

D

Explanation:

This is one of the answers that remains on this question while the others get switched around if that makes sense

What is the mass of a falling rock if it produces a force of 147 n?
F=
M=
A=

Answers

F=147N;

Acceleration=9.8m/s2;

Mass=15kg
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