PHYSICS MIDDLE SCHOOL

The borders of played never change.

True or false

Answers

Answer 1

Answer:

Answer:

The borders of played never change.

True or false

true

Answer 2

Answer:

Answer:

The correct answer is actually false.

Explanation:

Took the quiz

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Water moves from Earth's surface to the atmosphere and back to Earth's surface again in a process known as the water cycle. Which of the following is the major form of energy driving the water cycle?A. nuclear energy
B. geothermal energy
C. solar energy
D. chemical energy

Answers

That's heat from the sun, which evaporates the water. (Choice-C)

Answer:

That's heat from the sun, which evaporates the water. (Choice-C)

Explanation:

How does the sun cause wind?

Answers

wind is caused by a difference in pressure from one area to another area on the surface of the earth. Air naturally moves from high to low pressure, and when it does, it is called wind. Generally, we can say that the cause of wind is the uneven heating of the earth's surface by the sun.

A person is rowing across the river with a velocity of 4.5 km/hr northward. The river is flowing eastward at 3.5 km/hr (Figure 4). What is the magnitude of her velocity ( v ) with respect to the shore?

Answers

The magnitude of her velocity with respect to the shore will be 5.70 Km/h. The change of displacement with respect to time is defined as velocity.

What is velocity?

Velocity is defined as the change in displacement with respect to time. The quantity of velocity is a vector quantity. It is a component that is time-based. It is measured in meters per second.

The given data in the problem is;

Q is the magnitude of Velocity of the boat = 4.5 km/hr

P is the magnitude of Velocity of the river flowing = 3.5 km/hr

R is the resultant of velocity P and Q=?

θ is the angle between the two velocities = 90°

From the law of vector addition;

$\rm R= √(P^2+Q^2+2PQcos\theta) \n\n \rm R= √((3.5)^2+(4.5)^2+2* 3.5 * 4.5 cos90^0) \n\n \rm R=5.70 \ m/sec$

Hence the magnitude of her velocity with respect to the shore will be 5.70 Km/h.

To learn more about the velocity refer to the link;

brainly.com/question/862972

Answer: The magnitude of her velocity ( v ) with respect to the shore is 5.70 km/h.

Explanation:

Magnitude of Velocity of the boat = Q

Magnitude of Velocity of the river flowing = P

R = Resultant velocity due to velocity of boat and velocity of river.

Applying Law of triangles of vector addition :

$R=√(P^2+Q^2+2PQCos\theta)$

From the figure attached:

P = 3.5 k/h, Q = 4.5 km/h

$\theta= 90^o$

$R=√(P^2+Q^2+2PQCos\theta)=√((3.5)^2+(4.5)^2+3.5* 4.5* cos90^o)=5.70$

$(Cos90^o=0),(sin 90^o=1)$

$\alpha =tan^(-1)(Qsin\theta)/(P+Qcos\theta)=tan^(-1)(4.5 sin 90^o)/(3.5+4.5 cos90^o)=tan^(-1)(4.5)/(3.5)=52.12^o$

The magnitude of her velocity ( v ) with respect to the shore is 5.70 km/h.

You have trained all year for a marathon. In your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4.5 hours.What would your average speed have to be to complete the race in 4.5 hours? Give you answer in kilometers per hour.

Answers

To complete the marathon of 26 miles in 4.5 hours, the average speed required is 9.3 kilometers per hour.

What is average speed?

To find the average speed required to complete a marathon of 26 miles in 4.5 hours, we can use the formula:

average speed = total distance / total time

The total distance of the marathon is 26 miles, which is equivalent to 41.84 kilometers (1 mile is approximately 1.60934 kilometers).

The total time we want to complete the marathon in is 4.5 hours, which is equivalent to 4.5 × 60 = 270 minutes.

Converting the units of distance and time to kilometers and minutes respectively, we have:

average speed = 41.84 km / 270 min

Simplifying this expression, we get:

average speed = 0.155 km/min

To convert the units to kilometers per hour, we can multiply by 60, since there are 60 minutes in an hour:

average speed = 0.155 km/min × 60 min/h = 9.3 km/h

Learn more about average speed, here:

brainly.com/question/12322912

#SPJ2

26 miles is roughly 41.84 kilometers. So all we have to do is put 41.84 over the time.

41.84/4.5

9.298 km/hr

Which information about the earth would not be represented when a globe is used as a model?Choose all answers that are correct.

A.
different geographic regions on the earth

B.
the speed of revolution around the sun

C.
the location of all continents found on the earth

D.
the speed of rotation on its axis