A balloon and a mass are attached to a rod that is pivoted at P.

The balloon is filled with helium, a gas less dense than air, so that it applies an upward force on
the rod.

The rod is horizontal and stationary.
Which action causes the rod to rotate clockwise?

A Move both the balloon and mass 10 cm to the left.
B Move both the balloon and mass 10 cm to the right.
C Move both the balloon and mass to the 25 cm mark.
D Move the balloon to the 20 cm mark and the mass to the 30 cm mark.
​

Answer:

Weight is a force

Explanation:

Weight is the force of gravity on a mass. It can also be seen through this equation: F=ma, where m is the mass of the object and a is the acceleration of gravity.

Answer:

Speed of wave = 2.5 m/s

Explanation:

Given:

Time taken by wave = 6 second

Height (Distance) of wave = 15 meter

Find:

Speed of wave

Computation:

⇒ Speed = Distance / Time taken

⇒ Speed of wave = Height (Distance) of wave / Time taken by wave

⇒ Speed of wave = 15 / 6

Speed of wave = 2.5 m/s

Answer:

Liters

Explanation:

Miles, Ounces, and Fahrenheit temperature are american measurements and also not used in physics equations. Liters are very commonly used in physics equations.

Answer:

12m

Explanation:

To obtain the answer to the question given, we must observe the characteristics of image formed by a plane mirror.

The image formed by a plane mirror have the following characteristics:

1. Laterally inverted.

2. Same distance as the object from the mirror.

3. Same height as the object.

4. Virtual.

With the above information, we can calculate the distance between the boy and his image as follow:

Initially:

Object distance (u) = 4m

Image distance (v) = 4m

The boy moved 2m away, therefore:

Object distance (u) = 2 + 4 = 6m

Image distanc(v) = 2 + 4 = 6m

The distance between the boy and his image will be the sum of his distance (u) and image distance (v) i.e (u + v)

The distance between the boy and his image = 6 + 6 = 12m

Therefore, the distance between the boy and his image is 12m.

Answer:

Option A. a

Explanation:

Motion variables include:

1. Final velocity (vf).

2. Initial velocity (vi).

3. Time (t).

4. Acceleration (a)

5. Distance (x)

Considering the equation given in the question:

Δx = ½(vf + vi) t

We can see that the acceleration (a) is missing in the equation.

Answer:

[tex] \boxed{\sf Time \ in \ which \ train \ will \ come \ to \ rest = 20 \ sec} [/tex]

Given:

Initial velocity (u) = 30 m/s

Final speed (v) = 0 m/s

Acceleration (a) = - 1.5 m/,s²

To Find:

Time in which train will come to rest (t).

Explanation:

[tex]\sf From \ equation \ of \ motion: \\ \sf \implies \bold{v = u + at} \\ \\ \sf Substituting \ value \ of \ v, \ u \ and \ a: \\ \sf \implies 0 = 30 + ( - 1.5)(t) \\ \sf \implies 0 = 30 - 1.5(t) \\ \sf \implies 30 - 1.5(t) = 0 \\ \\ \sf Subtract \: 30 \: from \: both \: sides: \\ \sf \implies (30 - \boxed{ \sf 30}) - 1.5(t) = \boxed{ \sf - 30} \\ \\ \sf 30 - 30 = 0 : \\ \sf \implies - 1.5(t) = - 30 \\ \\ \sf Divide \: both \: sides \: of \: - 1.5(t) = - 30 \: by \: - 1.5 : \\ \sf \implies \frac{ - 1.5(t)}{ \boxed{ \sf - 1.5}} = \frac{ - 30}{ \boxed{ \sf -1.5 }} \\ \\ \sf \frac{ \cancel{ \sf 1.5}}{\cancel{ \sf 1.5}} = 1 : \\ \sf \implies t = \frac{ - 30}{ - 1.5} \\ \\ \sf \frac{ - 30}{ - 1.5} = \frac{\cancel{ \sf 1.5} \times 20}{\cancel{ \sf 1.5}} = 20 : \\ \sf \implies t = 20 \: sec[/tex]

So,

Time in which train will come to rest = 20 seconds

Answer:

she'll be 42.3 years old

Explanation:

The year she left is 2020

she returns in 2040

the time observed to have passed by on earth is 40 years

she traveled at a speed of 2.5 x 10^8 m/s

From relativity, the astronaut will experience a time dilation and will age more slowly.

the time that is observed to pass on her ship will be gotten from

t' = [tex]t\sqrt{1 - \frac{v^{2} }{c^{2} } } }[/tex]

where t is the time that is observed to pass by an earthly observer

v is the speed of her ship

c is the speed of light = 3 x 10^8 m/s

v/c = 2.5/3 = 0.83  

t' = [tex]40{\sqrt{1 - 0.83^{2} } }[/tex] = 40 x 0.5578 = 22.3 years would have passed for her

This means that she'll be 20 + 22.3 = 42.3 years old

Answer:

9.666666º

Explanation:

In this exercise we must transform from hexadecimal units and decimal units.

For this we must take into account that in the sexagesimal system the base is 60 and in the decimal system the base is 10. This means that by taking 60 minutes we have a degree

 transform

               9º 40 ’a Aº

we use a direct proportion rule, where 60 minutes is equivalent to 10 decinal minutes

           40 ’[hexadecimals] = 40‘ (10/60) = 6,666 ’[decimals]

let's take these pleasant decimal minutes

          6.666 ’= 6.6666 (1/10) = 0.66666º

we already have all the units in degrees, we can add them

          9º + 0.666666º = 9.666666º

Answer:

104.9 m

5.63 s

45.3 m/s

Explanation:

Given:

y₀ = 100 m

v₀ = 9.8 m/s

a = -9.8 m/s²

Find: y when v = 0 m/s

v² = v₀² + 2a (y − y₀)

(0 m/s)² = (9.8 m/s)² + 2 (-9.8 m/s²) (y − 100 m)

y = 104.9 m

Find: t when y = 0 m

y = y₀ + v₀ t + ½ at²

0 m = 100 m + (9.8 m/s) t + ½ (-9.8 m/s²) t²

0 = 100 + 9.8t − 4.9t²

t = [ -9.8 ± √(9.8² − 4(-4.9)(100)) ] / 2(-4.9)

t = (-9.8 ± 45.3) / -9.8

t = 5.63 s

Find: v when y = 0 m

v² = v₀² + 2a (y − y₀)

v² = (9.8 m/s)² + 2 (-9.8 m/s²) (0 m − 100 m)

v = -45.3 m/s

|v| = 45.3 m/s

Answer:

At the point of dropping the object, by Newton's first law due to gravitational force [tex]F_g[/tex] = m × g, accelerates

By Newton's Second law the object reaches impacts on the air with the gravitational force resulting in changing momentum of m×(Final Velocity - Initial Velocity)

As the velocity increases, the rate of change of momentum becomes equivalent to the gravitational force and by Newton's third law, the action action and reaction are equal and opposite hence they cancel each other out

The body then moves at a constant uniform motion down according to Newton's first law

Explanation:

At the point the object of mass, m, is dropped from the height of the tower, the only force acting on the object is the gravitational force such that the object has an acceleration which is the acceleration due to gravity, g, and the gravitational force is therefore = m × g

As the speed of the object increases while the object is falling with the gravitational acceleration the rate at which the object cuts through layers of air which (by Newton's first law of motion, are at rest ) has some buoyancy effect also increases therefore, the object is constantly increasingly changing the momentum of the air which by Newton's second law results, at an high enough velocity, and by Newton's third law, in a force equal to the applied gravitational force

Therefore, the force of the air drag becomes equal to the gravitational force, cancelling each other out and the object then moves according to Newton;s first law, in uniform motion of a constant speed while still falling down.

Answer:

it shows that co2 is absorbed by the atmosphere.

when the animals respire they produce co2 which is release in atmosphere and in presence of sunlight and chlorophyll the plants manufacturs the food and releases the oxygen in the atmosphere .

hope it helps..

Answer:

Its A

Explanation:

Answer:

Please go through the 2nd photo for the last part of the question that is " how far does it go in the 4th second "

Answer:

[tex]x=\frac{1}{2}at^{2}+v_{0}t\\\\1s: x=0.75(1)^{2}+3(1)=3.75m\\5s: x=0.75(5)^{2}+3(5)=33.75m\\4th=3s>>4s: x_{4} =(0.75(4)^{2}+3(4))-(0.75(3)^{2}+3(3))=8.25m[/tex]

I've written all the needed equations for you. All you have to do is some replacements.

Please do not hesitate to ask further questions.

Answer:

inclined plane

Explanation:

An inlcined plane is a simple machine used to slide an object over an obstacle

Answer:

The truce ended all wars

Explanation:

The Olympic Truce or the sacred truce, is the declaration made by ambassadors for the laying down of arms and the stop of all hostilities starting from seven days before the  Olympic games began and ending seven days after the games to provide safe passage for travelling athletes and also spectators to and from the Olympic games

However, the  games were held during Persian wars and also during the Peloponnesian wars. As such the truce stopped mainly conflicts that have direct impact on the Olympic games and there was an attack in Olympia in 364 BC during the games.

Answer:

The truce ended all wars

Explanation:

Apex

Answer: Its answer C: A wheelbarrow is more difficult to move as More objects are placed inside.

Explanation: The greater the mass of the object the more force is needed to make it move.

Hope this helps!! :)

Answer:

Half Life = 90/30 = 3 Half lives

Half Life = 30 years

So,

4 g Cobalt after 30 years = 4/2

=> 2 g

2 g Cobalt after next 30 years = 2/2

=> 1 g

1 g Cobalt after next 30 years = 1/2

=> 0.5 g

So, After 90 years, 0.5g of cobalt isotope will be left.

Answer:

[tex]\large \boxed{R_{\text{m}} = 5R_{\text{e}}}[/tex]

Explanation:

A projectile has its maximum range when you fire it at an angle of 45°.

The formula becomes

[tex]R = \dfrac{v^{2}}{g}[/tex]

If you are comparing the ranges on the Moon and the Earth,

[tex]\dfrac{R_{\text{m}}}{R_{\text{e}}} = \dfrac{v^{2}}{g_{\text{m}}}\div \dfrac{v^{2}}{g_{\text{e}}} = \dfrac{v^{2}}{g_{\text{m}}}\times \dfrac{g_{e}}{{v^{2}}} = \dfrac{ g_{\text{e}}}{g_{\text{m}}}\= \dfrac{g}{0.2g} = \textbf{5}\\\\\large \boxed{\mathbf{R_{\text{m}} = 5R_{\text{e}}}}[/tex]

Answer:

16

Explanation:

it goes up 4 each dash

Answer:

16

Explanation:

Answer:

running

Explanation:

it really gets your heart pumping in blood flowing

Answer:

Explanation:

The average pressure at mean sea-level (MSL) in the International Standard Atmosphere (ISA) is 1013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury. Pressure (p), mass (m), and the acceleration due to gravity (g), are related by P = F/A = (m*g)/A, where A is surface area.

Answer:

t = 2 seconds

Explanation:

In 2nd question, the question is given the attached figure.

Initial speed of the bus, u = 0

Acceleration of the bus, a = 8 m/s²

Final speed, v = 16 m/s

We need to find the time taken by the car to reach the stop. Acceleration of an object is given by :

[tex]a=\dfrac{v-u}{t}[/tex]

t is time taken

[tex]t=\dfrac{v-u}{a}\\\\t=\dfrac{16-0}{8}\\\\t=2\ s[/tex]

The bus will take 2 seconds to reach the stop.

Answer:

Explanation:

Simply put, because weight is a kind of Force.

Answer:

(B)

Explanation:

Because what ever angle the surface is, the light will reflect of of it perpendicular.

Answer:

built in potential Vbi = +0.5V

barrier height = 0.139 V

doping concentration = 5.39 × 10²³cm³

Explanation:

Answer:

c) Both the parts will weigh the same

Explanation:

center of gravity is based on weight so if you cut down the center of gravity you would have 2 equal parts

(might be D if it is cutting against the center of gravity)

Answer:

It will absorb yellow and reflect green

Answer:

Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

Explanation:

this is what i know but i am sorry if this doesn't help

Answer:

"equal"

Explanation:

ed 2021

Answer:

F = 8.23 × 10⁻⁸N

Explanation:

F= kq²/r²

k= 9×10⁹Nm²/C²

q= 1.6×10⁻¹⁹C

r= 5.29×10⁻¹¹m

F= 9×10⁹× (1.6×10⁻¹⁹)²/  (5.29×10⁻¹¹)²

F = 8.23 × 10⁻⁸N

Answer:

1.) Magnitude = 5596 N

2.) Direction = 60 degrees

Explanation: You are given that the breakdown vehicle A is exerting a force of 4000 N at angle 45 degree to the vertical and breakdown vehicle B is exerting a force of 2000 N

Let us resolve the two forces into X and Y component

Sum of the forces in the X - component will be 4000 × cos 45 = 2828.43 N

Sum of the forces in the Y - component will be 2000 + ( 4000 × sin 45 )

= 2000 + 2828.43

= 4828.43 N

The resultant force R will be

R = sqrt ( X^2 + Y^2 )

Substitutes the forces at X component and Y component into the formula

R = sqrt ( 2828.43^2 + 4828.43^2 )

R = sqrt ( 31313752.53 )

R = 5595.87 N

The direction will be

Tan Ø = Y/X

Substitute Y and X into the formula

Tan Ø = 4828.43 / 2828.43

Tan Ø = 1.707106

Ø = tan^-1( 1.707106 )

Ø = 59.64 degree

Therefore, approximately, the magnitude and direction of the resultant force on the truck are 5596 N and 60 degree respectively.

Answer: B.) HYDROPLANE

Explanation: The term hydroplane can be used to refer to a condition which usually occur during a downpour or on surfaces covered by water. It occurs when water forms a barrier or comes in between the frictional grip which occurs between the road surface and the car tyres. The contact between the car tyres and the road surface is supposed to give adequate frictional support which prevents the car from skidding or skidding uncontrollably on the road surface. However, when water comes invetween the surface, traction is lost and skidding results due to very low Coefficient of friction between the road and Tyre which was supposed to provide a firm grip between the tyres and the road surface.

When a vehicle is traveling on wet or slick roads, hydroplaning can occur. The correct answer is b) hydroplane.

When a vehicle is traveling on wet or slick roads, hydroplaning can occur. Hydroplaning happens when a layer of water builds up between the tires of the vehicle and the road surface, leading to a loss of traction.

This loss of traction can cause the vehicle to skid or slide, making it difficult to control. The tires ride on top of the water rather than maintaining contact with the road, resulting in reduced traction and control of the vehicle.

Therefore, When a vehicle is traveling on wet or slick roads, hydroplaning can occur. The correct answer is b) hydroplane.

To know more about hydroplaning:

https://brainly.com/question/33723980

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