What should students do before inserting the plug of an electrical device into a socket?

Answer:

the heart

Explanation:

Daily the heart pumps at least 2,500 gallons (9,450 liters) of blood. The heart has the ability to beat over 3 billion times in a person's life.

Answer:

b) east

Explanation:

centripetal force f= ma

the velocity at which the boy see the ball go by is 7ms-1

Answer:

Predicting weather patterns is the answer :-)

Explanation:

Answer:

Explanation:

The formula for calculating distance covered = Speed * time

If Maggie completed a 10000-m race at an average speed of 160

m/min, the the time taken by Maggie to complete the race will be expressed as;

Time = Distance/Speed

Time = 10000/160

Time = 62.5 minutes

If it took Tom 12.5 fewer minutes to complete the race, then the time taken by tom to finish the same race will be 62.5 - 12.5 = 50minutes.

To get Tom's average speed, we will use the same formula as above;

From Distance = Speed * Time

Speed = Distance/Time

Since both of them completed the same distance, distance covered by Tom is also 10000m

Tom's speed = 10000/50

Tom's speed = 200m/min

Hence Tom's average speed is 200m/min

Answer:

C. 34.78 m/s

Explanation: hope this helps ;)

Answer:

Precipitation

Explanation:

Ocean water may evaporate and precipitate into the river.

Answer:

the equation of a straight line is y = m x + b   where m is the slope and

b is the y intercept at x = 0

so y1 =  x1 + b   and y2 = m x2 + b    where (x1, y1) and (x2, 2 are points on the line.

y2 - y1 = m (x2 - x1)   or m = (y2 - y1) / (x2 - x1)

For the given points

m = ( 10 - 4)  /  (2 - 7) = - 6 / 5   for the slope

Answer:

6 teaspoons of baking powder required.

Explanation:

Given that

According to the recipe of pancake,

For every [tex]\frac{1}{3}[/tex] teaspoon of salt, 2 teaspoons of baking baking powder is required.

To find:

How much baking powder will be needed, if 1 teaspoon of salt was used ?

Solution:

This problem can be solved using ratio.

[tex]\frac{1}3[/tex] teaspoon of salt : 2 teaspoons of baking powder

Let us multiply the above ratio with 3.

[tex]\frac{1}{3}\times 3[/tex] teaspoon of salt : 2 [tex]\times[/tex] 3 teaspoons of baking powder

OR

1 teaspoon of salt : 6 teaspoons of baking powder

So, answer is 6 teaspoons of baking powder required.

Also, we can use the unitary method:

[tex]\frac{1}3[/tex] teaspoon of salt needs =  2 teaspoons of baking powder

1  teaspoon of salt needs =  [tex]\frac{2}{\frac{1}3}[/tex] teaspoons of baking powder

1  teaspoon of salt needs = 2 [tex]\times[/tex] 3 = 6  teaspoons of baking powder needed

So, the answer is:

6 teaspoons of baking powder required.

Answer:

6 teaspoons of baking powder

Explanation:

This is a simple ratio question.

Every 1/3 of a teaspoon of salt requires 2 teaspoons of baking powder.

Therefore, 1 teaspoon of salt will require:

                               =  1 x 2/1/3

                                    = 2 x 3 = 6 teaspoons of baking powder

Hence, 6 teaspoons of baking powder would be needed if they had used 1 teaspoon of salt.

Answer:

The given statement is false.

Explanation:

Answer:

The Sun's gravitational force is like the tetherball rope, in that it constantly pulls Earth toward it. Earth, however, like the tetherball, is traveling forward at a high rate of speed, which balances the gravitational effect. ... Instead, it travels in a nearly circular motion around the Sun, creating an orbit.

Answer:

Explanation:

Yep

Answer:

A family of 4 uses 1200 liters of water per day

1200 liters/day * 365 days/year = 438000 liters per year

If the town has 40,000 people, this equals 10,000 families

Explanation:

So the total town usage in one year = 10000*438000 = 4.38E9 liters = 4.38E12 cm^3 (scientific notation)

The area of the lake in cm^2 is 50 km^2 * (100 cm / m)^2 * (1000 m / km)^2 = 5E11 cm^2

The loss of volume of the lake is 5E11 cm^2 * h, where h is the change in depth

The total volume of water used by the town = the volume lost by the lake.

Therefore 4.38E12/5E11 = h = 8.76 cm

Answer:

this is because of air resistance

Explanation:

air resistance is a type of friction in air. It acts on the parachute as an upward force and slows the person speed while falling.

Answer:

10g

Explanation:

Answer:

1. Total momentum remains the same.

2.The brain moves inside the skull with a force equal and opposite to that of the impact.

3. Nina experiences a force equal to f.

4. The impulse of the collision in system A is twice the impulse of the collision in system B.

5. the greater the mass of the person, the greater the force of the punch

Explanation: Just took it! 100% :)

If the skaters are in a closed system the total momentum remains the same.

In a closed system the total momentum is always conserved.

By applying the principle of conservation of linear momentum, the total momentum before the push of skater A, will be equal to the total momentum after the push.

The equation is given as;

Initial momentum = final momentum

[tex]m_au_a + m_bu_b = m_av_a + m_bv_b[/tex]

where;

u and v represents the initial and final velocity of both skaters.

Thus, we can conclude that if the skaters are in a closed system the total momentum remains the same.

Learn more here: https://brainly.com/question/7538238

Answer:

7. Option D. 8.4×10¯⁴ m/s North.

8. Option B. 2 m/s

Explanation:

7. Determination of the speed of the snail.

The following data were obtained from the question:

Distance travalled (d) = 15 m

Time (t) = 300 mins

Speed (S) =?

Next, we shall convert 300 mins to secs. This can be obtained as follow:

1 min = 60 secs

Therefore,

300 mins = 300 × 60 = 18000 secs

Finally, we shall determine the speed of the snail as follow:

Distance travalled (d) = 15 m

Time (t) = 18000 secs

Speed (S) =?

Speed = Distance travelled /time

Speed = 15 / 18000

Speed = 8.3×10¯⁴ m/s

Since the snail travelled due north, the speed is therefore 8.3×10¯⁴ m/s North.

8. Determination of speed of the runner.

The following data were obtained from the question:

Distance travalled = 8 m

Time = 4 secs

Speed =?

Speed = Distance travalled / time

Speed = 8/4

Speed = 2 m/s

Therefore, the speed of the runner is 2 m/s.

Because theres no gravity, so it means that gravity = 0.

using the weight formula

weight = mass × gravity

= mass × 0

= 0N

Explanation:

Distance is the length of the path traveled.  Displacement is the difference between the final position and initial position.

Distance = 224 m + 156 m + 84 m + 248 m = 712 m

Displacement = 224 m − 156 m + 84 m − 248 m = -96 m

Displacement = 96 m westward

Answer:

50volts

Explanation:

Each of the resistance is 10ohms. 2 in series and 2 in parallel. it means the 2 parallel can combines with total of 10×10÷(10+10)= 5ohms and combine in series with 10ohms which is 10+10+5= 25ohms. in series connection, we have same current flowing. therefore the voltage source will be 25ohms × 2amps = 50volts

Answer:

A negative acceleration

Explanation:

When thrown, the basketball leaves the hands of the thrower with an initial velocity. This initial velocity is then gradually decelerated (negative acceleration) by drag forces, and its gravitational attraction to the earth, until the ball comes to rest. The acceleration on a thrown basketball is therefore negative.

Answer:

Alpha centauri will be brighter than Alpha Crucis .

Explanation:

Apparent magnitude of a star measures how bright a star is .

This scale is reverse logarithmic ie , the brighter  the  star , the lower is its magnitude . A magnitude equal to 5 scale higher represents less magnitude by a factor of 1/ 100 . In this way a difference of 1 magnitude represents a brightness ratio of 2.512 . Hence a star of brightness magnitude of 7 is less bright by a factor 2.512  than that of a star magnitude of 6 .

Answer:7,500J

Explanation:

Work done=force× distance

Explanation:

by inches to centimeter u can convert to meters

Answer:

-8m/s2

Explanation:

it decelerate. initial velocity u=50m/s and final velocity v= 10m/s and the time t= 5s

using this equation v= u+at

a= v-u/t= 10-50/5=-40/5= -8m/s2

Answer:

[tex] \boxed{\sf Acceleration \ (a) = -8 \ m/s^2} [/tex]

Given:

Initial velocity (u) = 50 m/s

Final velocity (v) = 10 m/s

Time taken (t) = 5 seconds

To Find:

Acceleration (a) of the car

Explanation:

From equation of motion we have:

[tex] \boxed{ \bold{v = u + at}}[/tex]

By substituting value of v, u & t in the equation we get:

[tex] \sf \implies 10 = 50 + 5a \\ \\ \sf \implies 5a + 50 = 10 \\ \\ \sf \implies 5a = 10 - 50 \\ \\ \sf \implies 5a = - 40 \\ \\ \sf \implies a = - \frac{40}{5} \\ \\ \sf \implies a = - 8 \: m {s}^{ - 2} [/tex]

[tex] \therefore[/tex]

Acceleration (a) of the car = -8 m/s²

Answer:

r = √(GMm/F)

Explanation:

F = GMm/r²

We can make r the subject of the above equation as follow:

F = GMm/r²

Cross multiply:

F × r² = GMm

Divide both side by F

r² = GMm/F

Take the square root of both side

r = √(GMm/F)

Thus, r is √(GMm/F)

Answer:

Three scales of temperature are

Celcius scale

Fahrenheit scale

Kelvin scale

Explanation:

Hope it will help :)

Answer:

Explanation:

Function of distance w.r.t time :

[tex]x(t) = \: y = \sqrt{2t} [/tex]

Differentiate w.r.t time to get velocity :

[tex] \frac{dy}{dt} = v = \frac{1}{ \sqrt{2t} } [/tex]

Differentiate w.r.t time to get Acceleration :

[tex] \frac{d^2y}{dx^2} = a \: = - \frac{1}{2t \sqrt{2t} } [/tex]

Answer:

true 1Ay 2D

Explanation:

1) In this exercise you are asked to investigate which statements are true

A) True. The friction force opposes the movement caused by the external force,

B) False. Mantuano in the opposite direction force

C) False. The static and scientific friction force act in the same direction, since the second appears when the movement does not start and the static friction decreases.

D) Fale the static and kinetic friction forces act in the same direction

2) How to overcome friction on a ramp

A) False. If the texture of the surface becomes rough, the friction force increases

B) False. Pressing the brick against the surface increases the normal and as the friction is proportional to the normal, it also increases

C) False. By lowering the table the weight component in the friction direction decreases

D) True. When lifting the board, the weight component increases and therefore can become greater than the friction

          Wx-fr = ma

           W sin tea - my mg cos tea = m a

As it increases, the sine increases and the cosine decreases.

Answer:

A. 50 W

Explanation:

Power = work / time

P = 500 J / 10 s

P = 50 W

Answer:

I agree with Raymond because total energy is conserved

Explanation:

The law of conservation of energy states that energy is neither created nor destroyed, but is transformed from one form to another. As the skateboarder goes up and down the ramp, there is the interconversion of energy between kinetic and potential energy, assuming energy is not lost to heat or other forms of energy.

Kinetic energy is energy in motion, and potential energy is energy at rest. As the skateboarder descends the ramp, the motion increases and the potential energy is converted to kinetic energy, and maximum kinetic energy is attained at the lowest point on the ramp because that is where speed is greatest. However, as the skateboarder ascends the ramp, the kinetic energy decreases progressively and is being converted to potential energy, which is greatest at the top of the ramp, where the skateboarder is momentarily at rest, and speed is zero. Hence at each point on the ramp, total energy is the same.