can someone please help me with these

Answer:

b

Explanation:

if there is a fire there is no time to waist

The answer depends on depends on your age and your capacities:

If you are a child, the correct option is A.

If you are a scientist adult, the correct option is B.

I will assume that you are a child, so you shouldn't be in any danger. In a laboratory, we can find a lot of glass and flammable things, so it is really dangerous to be near a fire.

Then really easily we can conclude that the correct option is A, immediately notify your instructor (who should have the knowledge to handle the situation)

Never try to handle it by yourself, especially never throw water on the fire, as there are a lot of cases (like if some oil starts combusting) where throwing water will make the situation a lot worst.

Now, if you are an adult and you are instructed in how to handle lab hazards, you should know where the nearest fire extinguisher is, then you can run to get it and extinguish the fire before it goes out of control.

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Answer:

2.7

Explanation:

V=s÷t

v=13.5÷5.0

V=2.7

Answer:

Opposite direction

Explanation:

For example: The first object travels in the direction pointing to east, while the other one travels pointing to the west.

The first object will have a positive value while the second one will have a negative, cause it's going to the opposite direction

Answer:

459.195 (N).

Explanation:

in order to calculate the required value of the Fₓ:

Fₓ=F*cos(37°); Fₓ=575*0.7986≈459.195 (N).

For more info see the attachment (note, the required force Fₓ is marked with red colour).

pull of earths gravity.........

Answer:

x×y=2×2=4. 4×z=4×3=12. 4+12=16

Answer:

hope this helps

Explanation:

Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever. While simple machines may magnify or reduce the forces that can be applied to them, they do not change the total amount of work needed to perform the overall task.

Using 1st equation of kinematics

[tex]\\ \sf\longmapsto v=u+at[/tex]

[tex]\\ \sf\longmapsto v=4.24+2.91(-1.76)[/tex]

[tex]\\ \sf\longmapsto v=|4.24-5.12|[/tex]

[tex]\\ \sf\longmapsto v=0.8m/s[/tex]

We know that

Velocity is given by the rate of change of position w.r.t time

[tex]\\ \sf\longmapsto v=\dfrac{dx}{dt}[/tex]

[tex]\\ \sf\longmapsto vdt=dx[/tex]

[tex]\\ \sf\longmapsto (u+at)dt=dx[/tex]

[tex]\\ \sf\longmapsto u{\displaystyle{\int}_0^t}dt+a{\displaystyle{\int}_0^t}dt={\displaystyle{\int}^x_{x_0}}dx[/tex]

[tex]\\ \sf\longmapsto ut+\dfrac{1}{2}at^2=(x-x_0)[/tex]

[tex]\\ \sf\longmapsto x=x_0+ut+\dfrac{1}{2}at^2[/tex]

For the student that walks to the right 25 m in 15 s and then turns and walks to the left 15 m in 8.0 s, we have:

1. The average speed is 1.74 m.

2. The average velocity is 1.42 m.

1. The average speed is an scalar wich is given by:

[tex] V = \frac{d_{t}}{t_{t}} [/tex]

Where:

[tex]d_{t}[/tex]: is the total distance

[tex]t_{t}[/tex]: is the total time

The total distance and the total time can be calculated as follows:

[tex]d_{t} = d_{1} + d_{2} = 25 m + 15 m = 40 m [/tex]

[tex] t_{t} = t_{1} + t_{2} = 15 s + 8.0 s = 23 s [/tex]

Since V is a scalar, the direction of motion is not important to calculate the final value.

Then, the average speed is:

[tex] V = \frac{d_{t}}{t_{t}} =\frac{40 m}{23 s} = 1.74 m/s [/tex]

2. The average velocity is a vector, so the direction of motion is important here. This ΔV can be calculated with the following equation:

[tex] \Delta V = \frac{\Delta x}{\Delta t} = \frac{x_{f} - x_{i}}{t_{f} - t_{i}} [/tex]

Where:

x: is the displacement  

f: is for final and i: is for initial

Hence, the average velocity is:

[tex] \Delta V = \frac{x_{f} - x_{i}}{t_{f} - t_{i}} = \frac{15 m - 25 m}{8.0 s - 15 s} = 1.42 m/s [/tex]

You can find more about average speed and average velocity here: https://brainly.com/question/12322912?referrer=searchResults

I hope it helps you!

Explanation:

The branch is possessing gravitational potential energy.

Answer:

50m/s

Explanation:

here;

distance travelled(s): 200m

time taken(t): 4s

now

velocity(v): s/t

= 200/4

Velocity: 50m/s#

Answer:

It is 10.75

Explanation:

Answer:

Explanation:

A blunt needle won't get the job done as it won't pass through the fabric well

Answer:

2 Newton

Explanation:

from newton second law

F = ma

as we have the mass equals 4 kg

we need to get the acceleration which will be change in velocity over change in time

a = ∆V/∆t = (4-2)/4 = 0.5

so F = 4 * 0.5 = 2

Answer:2N

Explanation:

The Answers are in attachment.

Answer:

three light sources at different directions, maybe of different sizes and intensity

Answer:

2.2

Explanation:

It then pauses before flying with an average velocity of 6.8 m/s east for 3.5 s to another branch.

Answer:

9 m/s

Explanation:

The seagull flew at a constant velocity for a total of 32 seconds.

One-quarter of 32 is:

[tex]\implies \dfrac{1}{4} \times 32=\dfrac{32}{4}=8\; \sf seconds[/tex]

Therefore, if the seagull flew 72 meters in one-quarter of 32 seconds, it flew 72 meters in 8 seconds.

[tex]\boxed{\sf Speed=\dfrac{Distance}{Time}}[/tex]

To find the velocity (speed) of the seagull, substitute the distance and time into the formula:

[tex]\implies \sf Velocity=\dfrac{72}{8}=9\; \sf m/s[/tex]

Answer: 33

Explanation:

12+3=15, so in 3 years time Ruto will be 15.

Because 15 is said to be 1/3 times his fathers present age (x), you can plug that into an equation.

15=1/3(x)

Then solve the equation.

(3)15=[1/3(x)]•3

45=x

His father is currently 45, so if you subtract 12 from that, you get 33.

Ruto’s father was 33 years old 12 years ago.

We have that The acceleration due to gravity on the Moon And

The acceleration due to gravity on the surface of the Earth is approximately

[tex]1.625 m/s^2[/tex]

[tex]9.81 m/s^2,[/tex]

From the Question we are asked

The value of G on earth and moon?

Where G refers to The acceleration due to gravity

Generally

The acceleration due to gravity on the Moon is approximately

[tex]1.625 m/s^2,[/tex]

And

The acceleration due to gravity on the surface of the Moon is approximately

[tex]9.81 m/s^2,[/tex]

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Answer:

plastic

Explanation:

because it is an insulator that it is a poor conductor of electricity.

There is no flow of electricity in the plastic, so the plastic has greater resistance.

A substance's ability to obstruct the flow of electrical current is referred to as resistance. It is symbolized by the capital letter R. The ohm, frequently written as a word and sometimes represented by the capital Greek letter omega, is the unit of resistance that is typically used.

A component's resistance is one ohm when a one-volt potential difference (voltage) is present. The current in a direct-current (DC) electrical circuit is inversely proportional to the resistance, while the supplied voltage is held constant. The current is cut in half when the resistance is doubled; when the resistance is cut in half, the current is increased by double.

Thus, plastic has greater resistance.

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#SPJ5

The displacement of the mouse is 5m and the total distance is 9m.

The given parameters;

initial displacement of the mouse = 5 m north

second displacement = 1 m South

third displacement = 3 m west

To find:

Displacement is the change in the final position and the initial position of an object.

Distance is the total path covered by the object.

When the mouse was at 1 m south, the displacement = 5 m - 1m = 4m

The displacement of the mouse between 4m south and 3m west is calculated by using Pythagoras theorem.

[tex](displacement)^2 = 3^2 + 4^2\\\\(displacement)^2 = 25\\\\displacement = \sqrt{25} \\\\displacement = 5 \ m[/tex]

The total distance of the mouse = 5 m + 1m + 3m = 9m

Thus, the displacement of the mouse is 5m and the total distance is 9m.

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Answer:

The coil spring of a wind-up clock.

An archer's stretched bow.

Explanation:

Answer:

5,865,696,000,000 miles

Explanation:

one year = 31536000 second

31536000 × 186000 = 5,865,696,000,000

Answer:

Frequency = 100 Hz

Time period = 0.01 sec

Explanation:

f= 3500/35 = 100

T = 1/f = .01

Answer:

1.38 s

Explanation:

Use the free falling formula

T = √(L)/ g

T = √18.75/9.8

T = 1.38 s

Answer:

The charge of an atom is the number of protons minus the number of electrons.

Explanation: