Help pleasei really need help it is hard

Answer:

This all simply due to the size of the two water bodies question and the your body size in a bath tub the water is small enough to allow the upthrust displace water out if the tub whereas in a lake the water is bigger and your body size is smaller to allow any noticeable upthrust that would cause an overflow

Explanation:

There are 70 people in a class. A student wants to plot these data in a circle.  

We need to find the angle should the wedge for barbecue have.

There are 20 such students that like barbecue.

So,

[tex]B=\dfrac{20}{70}\times 360^{\circ}\\\\B=102.85^{\circ}[/tex]

or

B = 103°

It means that 103° on the circle shows the number of students that like barbecue .

Answer:

pe=mgh

Explanation:

hope this helped

Explanation:

The frequency of radio waves is 1.667 GHz

One portion of the same wave front travels 1.260 mm farther than the other before the two signals are combined.

There are two conditions for interference either constructive or destructive.

For constructive interference , the path difference is n times of wavelength and for destructive interference, the path difference is (n+1/2) times of wavelength

We can find wavelength in this case as follows :

[tex]\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{1.667\times 10^9}\\\\\lambda=0.1799\ m[/tex]

If we divide path difference by wavelength,

[tex]\dfrac{\delta}{\lambda} =\dfrac{1.26}{0.1799}\\\\\dfrac{\delta}{\lambda} =7\\\\\delta =7\lambda[/tex]

It means that the path difference is 7 times of the wavelength. it means the two waves combine constructively and the value of m for the path difference between the two signals is 7.

Answer:

Oracio

Explanation:

Mutiply the cost per hour by the time to complete the job

Camila 40x20=800

John 30x30= 900

Nora 20x40=800

Oracio 15x50=750

The Oracio engineer would be the most cost-effective for the project.

Here we Mutiply the cost per hour by the time to complete the job

So,

Camila 40(20)=800

John 30(30)= 900

Nora 20(40)=800

Oracio 15(50)=750

Learn more: https://brainly.com/question/10283285?referrer=searchResults

When the bat strikes the ball, the ball pushes against the bat due to reaction force, The correct option is D.

It is a type of force that acts in the opposite direction of the applied force, for example when one applies active force towards the stationery wall, the wall exerts a reactive force in the opposite direction.

Therefore when a girl hits a baseball with a bat, the baseball applies an active force on the ball in which as a result of reactive force the ball pushes against the bat.  

Learn more about reaction forces

https://brainly.com/question/14853868

#SPJ5

Answer:the ball pushes against the bat

Explanation:because I got it right

Answer:  [tex]\dfrac{d-0.5at^2}{t}=v_i[/tex]

Explanation:

[tex]d=v_it+0.5at^2\\\\\\\text{Subtract}\ 0.5at^2\ \text {from both sides:}\\d-0.5at^2=v_it\\\\\\\text{Divide both sides by t:}\\\dfrac{d-0.5at^2}{t}=v_i[/tex]

Answer:

i) angle of projection = 17.4⁰

ii) initial velocity = 131.2 m/s

Explanation:

To determine the angle of projection and initial velocity of projection we have to apply the projectile path equation

where : Vi = initial velocity , g = acceleration due to gravity , ∅ = angle of projection

attached below is the detailed solution of the problem above

Given : Initial speed , u = 0 m/s .

Final speed , v = 8.7 m/s .

Distance travelled , d = 32 m .

To Find :  How far from the starting line will the sprinter be if they continue at the speed for 5 more seconds .

Solution :

It is given that after reaching speed of 8.7 m/s speed become constant .

So , distance covered in 5 second is :

[tex]d=v \times t\\d=8.7 \times 5 \ m\\d=43.5 \ m[/tex]

Now , total distance from start line is :

[tex]D=32+43.5=75.5 \ m[/tex]

Therefore , the distance from starting line is 75.5 m .

Hence , this is the required solution .

Answer:

Longer legs

Explanation:

I took the test

Answer: Velocity...Distance

Explanation: Velocity is a vector quantity as it has both magnitude and direction

Distance is a scalar quantity as it has only magnitude and no direction

hope this helped...

Answer:

Explanation:

The answer is electric field intensity. Electric field intensity is the force per unit positive charge which the charge exerts at any point.

Answer:

air resistance slows the feather

Explanation:

.1 nano ampere

Explanation:

I= Q flow/ t in secs

I= 233/2700

I= 0.0862e/sec

I= 0.0862/6.25 * 10^8 ( ampere conversion)

I= 0.1 nano ampere .

Answer:

50°

Explanation:

Projectiles launched at complementary angles have the same range.

Answer:

See the answer below

Explanation:

The temperature stops rising when water begins to boil because the heat which causes the rise in temperature is now diverted into changing the phase of the boiling water.

The conversion of substances from one state of matter to another requires energy. Hence, instead of causing a rise in the temperature of the boiling water, the heat is used to convert the liquid water into vapor. The heat thus becomes what is known as the latent heat of vaporization.

Answer:

47.515 cm²

In meter square= 4.7515 *10^-3 m²

Explanation:

The radius of a circle = 5.5 cm

In meter= 5.5*0.01

= 0.055 m

the circumference= 34.56 cm

in meters = 34.56 cm*0.01

= 0.3456 meters

the area= 95.03 cm²

in square meters =95.03*(0.01)²

in square meters= 9.503*10^-3 m²

. area under the curve at the right

= Area of semi circle

= Area of circle/2

= 95.03 /2

= 47.515 cm²

In meter square= 4.7515 *10^-3 m²

Explanation:

The velocity of the wave is:

v = (9.0π rad/s) / (0.1π / cm)

v = 90 cm/s

v = 0.9 m/s

Velocity of a standing wave on a stretched string is:

v = √(T / (m/L))

0.9 m/s = √(0.081 N / (M / 2.0 m))

0.81 m²/s² = 0.081 N / (M / 2.0 m)

M / 2.0 m = 0.1 kg/m

M = 0.2 kg

Answer:

Explanation:

the weight of the telescope decreases  because the moon attract the body with less force as compared to earth due to less gravity as compared to earth

When Scientists want to place a telescope on the moon to improve their view of distant planets. The telescope weighs 200 pounds on Earth. then  The weight of the telescope will decrease. therefore the correct answer is option B.

It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another, The gravity varies according to the mass and size of the body for example the force of gravity on the moon is the 1/6th times of the force of gravity on the earth.

Thus, when scientists attempt to mount a telescope on the moon in order to get a better view of far-off planets. 200 pounds are the telescope's weight on earth weight. The telescope's weight will then decrease. So, choice B is the right response.

Learn more about gravity from here

brainly.com/question/4014727

#SPJ5

Answer:

Mechanical energy is divided into two:Kinetic energy and Potential energy....The diver diving down exhibits kinetic energy because she is moving but when she has stopped it means she has potential energy which means that a body is at rest....

Explanation:

It is given that, the volume of air is 53.28 m³. We need to convert it into scientific notation.

Any number in scientific notation can be given by :

[tex]N=a\times 10^b[/tex]

a is real no and b is any integer

We have, V = 53.28 m³

To write it into scientific notation, shift decimal before 3 such that,

[tex]V=\dfrac{5328}{100}[/tex]

No multiply and divide by 10. So,

[tex]V=\dfrac{5328}{100}\times \dfrac{10}{10}\\\\V=\dfrac{5328}{1000}\times 10\\\\V=5.328\times 10^1\ m^3[/tex]

So, the correct option is (a).

Answer:

false

Explanation:

most prototypes are and perfect and they are build to find our mistakes

Answer:m=42kg

Explanation:

wieght = mass × gram

420 = mass × 10

therefore , answer is 42

Answer:

[tex]\huge \boxed{\mathrm{42 \ kg} }[/tex]

Explanation:

[tex]\sf Weight \ (N) = mass \ (kg) \times acceleration \ of \ gravity \ (m/s^2)[/tex]

[tex]\sf W=m \times g[/tex]

We know that the acceleration of gravity on the Earth is approximately 10 m/s.

The weight of the body is given 420 N.

[tex]\sf 420=m \times 10[/tex]

Solve for the mass. Divide both sides by 10.

[tex]\sf m = 42[/tex]

The mass of the body is 42 kg.

Answer:

A flame always point upwards because the flame's gas is hotter than the surrounding air and, like you said, a hot gas is always lighter or less dense than a cold gas.

Explanation:

Answer:

b

Explanation:

Answer:13.75

Explanation:

Answer:

Some of the payoffs companies receive when offering child care benefits to employees;

1) Employees are proud to tell others they work for such establishments which make the establishment attractive to talents

2) Reduced attrition for work place policy

3) Increased loyalty of the employees to the companies mission

4) Workers are less likely to take work appointment in other places

5) Child care offering are some of the aspects workers consider when searching for jobs

6) Companies can enjoy tax breaks

Explanation:

Answer:

Optical Fiber is a wired communication medium. It is made using one or many thin strands of glass or plastic.

Explanation:

Fiber optics is used in communications, medicine, optical inspection, lighting and in the making of sensors.

Answer:

Yes

Explanation:

Friction is a force that opposes relative motion between systems in contact. One of the simpler characteristics of friction is that it is parallel to the contact surface between systems and always in a direction that opposes motion or attempted motion of the systems relative to each other.

Answer:

1.A driver of automobile brakes abruptly and, by inertia, shoots forward.

2. A stone in the ground is in a state of rest

Hope it helps

Pls mark it as Brainliest