You drive your car for 2.0 h at 40.0 km/h then for 2.0 h at 60.0 km/h what is your average velocity?

Answers

Answer 1

Answer: In order to calculate velocity, we'd need to know the straight-line distance between the start and the finish, and we'd also need the direction of that line. The best we can do with the information given in the question is calculate the average SPEED.

Average speed = (total distance covered) / (time to cover the distance).

Distance covered in the first 2 hours = (2 hr) x (40 km/hr) = 80 km.
Distance covered in the second 2 hours = (2 hr) x (60 km/hr) = 120 km.

Total distance covered = (80 + 120) = 200 km
Time to cover the distance = (2 + 2) = 4 hours

Average speed = (200 km) / (4 hours) = 50 km/hour

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Which of the following best describes the difference between speed and acceleration? A. Acceleration is the distance an object travels within a specific unit of time, whereas speed is the rate at which the acceleration or direction of an object is changing. B. Speed is the distance an object travels within a specific unit of time, whereas acceleration is the rate at which the speed or direction of an object is changing.

C. Acceleration is the distance an object travels within a specific unit of time, whereas speed is a measure of the force necessary to change the acceleration of an object.

D. Speed is the distance an object travels within a specific unit of time, whereas acceleration is a measure of the force necessary to change the speed of an objectWhich of the following best describes the difference between speed and acceleration? A. Acceleration is the distance an object travels within a specific unit of time, whereas speed is the rate at which the acceleration or direction of an object is changing.
B. Speed is the distance an object travels within a specific unit of time, whereas acceleration is the rate at which the speed or direction of an object is changing.
C. Acceleration is the distance an object travels within a specific unit of time, whereas speed is a measure of the force necessary to change the acceleration of an object.
D. Speed is the distance an object travels within a specific unit of time, whereas acceleration is a measure of the force necessary to change the speed of an object.

Answers

The option that best describes the difference between speed and acceleration is : ( B ) Speed is the distance an object travels within a specific unit of time, whereas acceleration is the rate at which the speed or direction of an object is changing.

Difference between and Acceleration and Speed

Acceleration is the rate of change of velocity with time while speed is the rate of change distance with time.

Acceleration is a vector quantity because it has magnitude and direction while speed is a scalar quantity.

Hence we conclude that Speed is the distance an object travels within a specific unit of time, whereas acceleration is the rate at which the speed or direction of an object is changing.

Learn more about vector quantity : brainly.com/question/356987

Answer:

Speed is the distance an object travels within a specific unit of time, whereas acceleration is the rate at which the speed or direction of an object is changing.

(Apex) Pretest

Compare the outermost electrons of an atom with the inner most electrons of an atom in terms of energy

Answers

The innermost electron of an atom has the lowest level of energy while the outermost electron has the highest level of energy.
There are different energy levels in the atoms of elements, for an atom to go into an higher level it has to obtain more energy and to go to lower level it has to lose energy.

What net force will make a 5kg bowling ball accelerate by 1.5m/s squared

Answers

F = ma
F = force
m = mass
a = acceleration

1.5 m/s^2 = a
5 kg = m
F = ?

F = 5 * 1.5
F = 7.5 Newtons

Answer would then be : Force = 7.5 N

Which property of physical changes explains why matter is conserved in a physical change? The arrangements of particles do not change, and the bonds between atoms do not break. Mass, not energy, changes in a physical change. Energy and mass change in a physical change. The bonds between atoms do not break; it is only the arrangement that changes.

Answers

The property of physical changes that explains why matter is conserved in a physical change is - the bonds between atoms do not break; it is only the arrangement that changes.

Answer: it's D

Explanation:

Sally is going shopping with her friend Susan at the mall which is located 10 kilometers away from her house she drives half way to the mall and then realizes she forgot her purse at home she turns around and goes back home to get it and drives directly from her house to the mall what is the total distance that dally traveled ?

Answers

Answer:

the total distance that dally traveled is 20 km

Explanation:

given information:

the distance of sally's house and the mall is 10 km

she drives half a way to the mall and the goes back to the house to pick up the purse. So,

the distance of half way to the mall = 1/2 x 10 km = 5 km

the distance of half way to the house = half way to the mall = 5 km

the total distance from half way to the mall and return to the house (a)

a = 5 km + 5 km = 10 km

then, she drive directly to the mall, the distance (b), b = 10 km

the total distance that dally traveled (x)

x = a + b

= 10 km + 10 km

= 20 km

in the beginning she drive half the distance means 5km
then returned back means she returned this 5 km back
then 5+5=10
then she went to the mall that is 10 km
so 10+10=20km

4 points Two cylindrical resistors R, and R2 made from the same material are connected in parallel in a circuit. Both resistors are at the same temperature when the circuit is operational. Resistor R, has length and diameter d. Resistor R has length 8l and has a diameter d/1. Determine by what factor is the resistance R greater than R.St. your answer as an integer with no decimal place. Type your answer...

Answers

To determine the factor by which the resistance of resistor R2 is greater than resistor R1, we can use the formula for resistance of a cylindrical resistor:

R = ρ * (L/A)

Where R is the resistance, ρ is the resistivity of the material, L is the length of the resistor, and A is the cross-sectional area of the resistor.

Since both resistors are made from the same material and are at the same temperature, the resistivity ρ is the same for both resistors.

Let's calculate the resistance for R1 and R2 separately.

For resistor R1 (length = L and diameter = d), the cross-sectional area A1 is given by:

A1 = π * (d/2)^2

For resistor R2 (length = 8L and diameter = d/1), the cross-sectional area A2 is given by:

A2 = π * ((d/1)/2)^2

Simplifying the equations:

A1 = π * (d/2)^2 = π * (d^2/4)

A2 = π * ((d/1)/2)^2 = π * (d^2/4)

As we can see, both resistors have the same cross-sectional area A.

Now, let's calculate the resistance for R1 and R2:

R1 = ρ * (L/A1) = ρ * (L / (π * (d^2/4)))

R2 = ρ * (8L/A2) = ρ * (8L / (π * (d^2/4)))

Simplifying the equations further:

R1 = (4ρL) / (πd^2)

R2 = (32ρL) / (πd^2)

Now, let's find the factor by which the resistance R2 is greater than R1:

Factor = R2 / R1 = ((32ρL) / (πd^2)) / ((4ρL) / (πd^2))

Canceling out common terms:

Factor = (32ρL * πd^2) / (4ρL * πd^2)

Factor = 32 / 4

Factor = 8

Therefore, the resistance R2 is 8 times greater than the resistance R1.

The resistance of second resistor R2, is 16 times greater than the resistance of the first resistor R1.

The resistance of a cylindrical resistor is given by R = ρL/A, where ρ is the resistivity, L is the length, and A is the cross-sectional area (which is πd²/4 for a cylinder). For R1, it has length L and diameter d. For R2, it has length 8L and diameter d/1. The resistance of R2 is therefore:

R2 = ρ(8L)/(π(d/1)²/4)

By comparing R2 to R1, we find that R2 is 16 times the resistance of R1.

The resistance of second resistor R2, is 16 times greater than the resistance of the first resistor R1.

To know more about resistor, visit:

brainly.com/question/30672175

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