why exactly do people use simple
machines like a pulley

Answer:

90.3125 m

Explanation:

[tex]s = ut + \frac{1}{2} a {t}^{2} [/tex]

a = 10m/s^2 (constant)

S=height

U=initial velocity

a= gravitational acceleration

t= time

s = 0 + 1/2 * 10 * 4.25 ^2

u is 0 because it is dropped without velocity

s =90.3125 m

Answer:

no answer of this bcuz to find aclleration.initial velocity and final velocity too... I think question is wrong

Answer:

19.26 m/s

Explanation:

I will put a photo

Answer:

This question appears incomplete

Explanation:

This question appears incomplete, however Molybdenum-99 (⁹⁹Mo) is produced by bombarding Molybdenum-98 (⁹⁸Mo) with fast moving neutrons (¹₀n) as shown below

⁹⁸₄₂Mo + ¹₀n ⇒  ⁹⁹₄₂Mo + ⁰₀γ

This reaction is a nuclear caption reaction (which occurs in a nuclear reactor) for the production of Molybdenum-99 (⁹⁹Mo) which serves as a "precursor" for the production of medically viable/ Clinical Grade Technutium-99m (⁹⁹Tc) through Ion-exchange technique.

Answer:

A) A negative charge of value Q is induced on sphere B

B) there is an attraction between sphere

C) The charge of sphere A is distributed between the two spheres,

Explanation:

This is an electrostatic problem, in general charges of the same sign attract and repel each other.

with this principle let's analyze the different situations

A) The sphere A that is insulating has a charge on its surface and zero charge is its interior

   The conducting sphere B has zero charge, but the sphere A creates an attraction in the electrons, therefore a negative charge of the same value as the charge of the sphere A is induced in the part closest and in the part farther away than one that a positive charge.

A negative charge of value Q is induced on sphere B

B) In this case there is an attraction between sphere A with positive charge and sphere B with negative induced charge

C) When the two spheres come into contact, the charge of sphere A is distributed between the two spheres, therefore each one has a positive charge of value half of the initial charge, as now we have net positive charges in the two spheres charges of the same sign repel each other so the spheres separate

Answer:

The maximum speed is 21.1 m/s

Explanation:

Given that,

Radius of curve = 119 m

Maximum speed = 30 m/s

New radius = 59.5 m

We need to calculate the maximum acceleration

Using formula of acceleration

[tex]a_{c}=\dfrac{v^2}{r}[/tex]

Where, v = maximum speed

r = radius

a = acceleration

Put the value into the formula

[tex]a_{c}=\dfrac{30^2}{119}[/tex]

[tex]a_{c}=7.5\ m/s^2[/tex]

We need to calculate the maximum speed

Using formula of speed

[tex]v_{max}=\sqrt{a\times r}[/tex]

Put the value into the formula

[tex]v_{max}=\sqrt{7.5\times59.5}[/tex]

[tex]v_{max}=21.1\ m/s[/tex]

Hence, The maximum speed is 21.1 m/s

Answer:

I think this is something you're looking for so I hope they help

Explanation:

Answer:

the air particles dont move as fast in the cold air as in warm, so it doesnt push as often and shrinks.

Explanation:

see above

could you vote me brainliest plz? thx :)

Since the air molecules in cold air travel more slowly than they do in warm air, the air pushes less frequently and contracts.

Refraction is the process by which a wave changes direction while transitioning through one medium to another in physics. As an illustration, waves move much faster in the open ocean than in the shallow.

A tsunami will swing until it is moving perpendicular to the coastline if it is approaching a beach at an angle because the wave's outermost layer goes quicker than its inner portion. In warm air compared to cold, sound waves move more quickly. A lake's surface cools at night, and any sound waves that ascend are bent down by the warmer upper levels of the atmosphere. Because of their varying speeds, the electromagnetic waves which make up light are distorted when they move through a clear substance.

To know more about Refraction:

https://brainly.com/question/14760207

#SPJ5

Answer:

Bruh

Explanation:

I think

Answer:

Diesel power plants are also popularly used as standby supply of different industries, commercial complexes, hospitals. During power cut, these diesel power generators are run to fulfill required demand.

Explanation:

Answer:

Explanation:

If a particle to move from point A, where the electric potential is 14.7 V, to point B, where the electric potential is −24.5 V, the change in electric potential is expressed as:

∆V = VB-VA

Given VB = -24.5V

VA = 14.7V

∆V = -24.5-14.7

∆V = -39.2V

To calculate the change that occurs in the particle's electrostatic potential energy, when the particle is an electron, we will use the formula:

∆U = q∆V where q is the charge on the electron

Charge on an electron = -1.6×10^-19C

∆U = -1.6×10^-19C×-39.2

∆U = 62.72×10^-19 Joules

For a proton:

q = 1.6×10^-19C

∆U = 1.6×10^-19C×-39.2

∆U = -62.72×10^-19 J (calculation is similar as above, the only difference is the sign)

For a neutral hydrogen atom:

Charge on a neutral hydrogen atom is +1

∆U = 1×-39.2

∆U = -39.2Joules

For a singly ionized helium atom

Charge on the atom q = +1

∆U = 1×-39.2

∆U = -39.2Joules

Complete question is missing, so i have attached it.

Answer:

A) I = 3.5A

B) I = 4.5 A

C) I = 3.15A.

D)I = 3.25 A

Explanation:

a) When we connect across ab, the resistance from ac and bc is;

20ohms + 10ohms = 30 ohms.

This will now be parallel with the 15 ohms resistor.

Thus, equivalent resistance is;

R = (30 × 15)/(30 + 15)

R = 450/45

R = 10 ohms

Formula for Current is; I = (E/R)

Thus;

I = 35/10

I = 3.5A.

b) similarly, when we connect across bc, resistance from ac and ab is;

15 ohms + 20 ohms = 35 ohms.

This will now be parallel with the 10 ohms resistor.

Thus, equivalent resistance is;

R = (35 × 10)/(35 + 10)

R = 350/45

R = 7.778 ohms.

Current is;

I = 35/7.778

I = 4.5 A.

c) similarly, when we connect across ac, resistance from ab and bc is;

15 ohms + 10 ohms = 25 ohms.

This will now be parallel with the 20 ohms resistor.

Thus, equivalent resistance is;

R = (25 × 20)/(25 + 20)

R = 11.11 ohms.

Current is;

I = 35/11.11

I = 3.15A.

d) since connected across bc, the internal resistance will be added to the circuit resistance, which was seen to be 7.778 ohms in step b above

Thus, equivalent resistance = 7.778 + 3 ohms = 10.778

Current is;

I = 35/10.778

I = 3.25 A

(A) The current when connected across ab is 3.5A

(B) The current when connected across bc is 4.5 A

(C) The current when connected across ac is 3.15A

(D) The current when connected across bc with internal resistance is 3.25 A

(a) When connected across ab, the resistance between ac and bc is;

20Ω + 10Ω = 30Ω

It is parallel with 15Ω resistor.

Thus, equivalent resistance is;

R = (30 × 15)/(30 + 15)

R = 450/45

R = 10Ω

Now current is given by

I = (V/R)

I = 35/10

I = 3.5A

(b) When connected across bc, the resistance between ab and ac is;

15Ω + 20Ω = 35Ω

It is in parallel combination with the 10Ω resistor

Thus, equivalent resistance is;

R = (35 × 10)/(35 + 10)

R = 350/45

R = 7.778Ω

Now the current is:

I = 35/7.778

I = 4.5 A

(c) When connected across ac, the resistance between ab and bc is;

15Ω + 10Ω = 25Ω

it is now parallel with the 20Ω resistor.

Thus, - is;

R = (25 × 20)/(25 + 20)

R = 11.11Ω

Current is;

I = 35/11.11

I = 3.15A

(d) when connected across bc, the internal resistance will be added to the circuit resistance across bc.

So, equivalent resistance = 7.778 + 3 = 10.778Ω

Current is;

I = 35/10.778

I = 3.25 A

Learn more about equivalent resistance:

https://brainly.com/question/20708652?referrer=searchResults

Answer:

Explanation:

its unbalanced

Answer:

Ice hockeyyyyyy

Explanation:

Analysing the question:

since the ball is thrown upwards, the gravity will be applied opposite to the motion of the ball

We are given:

acceleration due to gravity (a) = -10 m/s²

initial upward velocity (u) = 16.6 m/s

final upward velocity (v) = 5.3 m/s

distance between the friends (s) = s m

Neglecting air resistance

Solving for the distance between the friends:

from the first equation of motion

v = u + at

replacing the variables

5.3 = 16.6 + (-10)(t)

-10(t) = 5.2 - 16.6

-10 (t) = -11.3

t = 1.13 seconds

from the second equation of motion

s = ut + 1/2 at²

replacing the variables

s = (16.6)(1.13) + -5(1.13)²

s = 18.8 - 6.4

s = 12.4 m

Therefore, the 2 friends are 12.4 m apart

[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]

Actually Welcome to the Concept of the Physics,

Since we know that, earth is surrounded by a atmosphere, hence on the surface we have high air density but at a higher altitude there is less air, thus pressure of air also less,

The higher the Altitude then lower the air pressure..

Answer:

Force = F = 3.63 [N]

Explanation:

To solve this problem we must use Newton's second law, which tells us that the sum of all forces must be equal to the product of mass by acceleration.

where:

m = mass = 125 [g] = 0.125[kg]

a = 29 [m/s^2]

ΣF = m*a

F = (0.125*29)

F = 3.63 [N]

Explanation:

To convert liters to cubic meters, multiply the liter value by 0.001 or divide by 1000

Explanation:

The force between charges is called electrostatic force. The force is given by the relation :

[tex]F=\dfrac{kq_1q_2}{d^2}[/tex]

Where

k is the electrostatic constant

d is the distance between charges

It is clear from the above formula that the electrostatic force is directly proportional to the product of charges and inversely proportional to the square of distance between them.

It means the larger the absolute value of the charges, the larger the force between them. Also, the larger the distance between particles with charge, the weaker the force between them.

Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects. And decreasing the separation distance between objects increases the force of attraction or repulsion between the objects. Electrical forces are extremely sensitive to distance.

The increment of the electric force by each factor should be explained below.

An electric force refers to the interaction of the attractive force or the repulsive force that lies between two charged bodies. In the case when there should be increment in the separation distance that lies between the objects so it reduced the attraction force. Due to the reduction in the seperate distance there should be an increment in the attraction force. Also, the electric force should be very sensitive with respect to the distance.

Learn more about electric force here: https://brainly.com/question/17562167

Answer:

99.9999 m

Explanation:

[tex]a_{x} =0[/tex] [tex]v_{xo} =14[/tex] [tex]a_{y} =-g[/tex] [tex]v_{yo} =0[/tex]

X-direction             | Y-direction

[tex]x=x_{o}v_{xo}t+\frac{1}{2} a_{x}t^2[/tex]  | [tex]y=y_{o}v_{yo}t+\frac{1}{2} a_{y}t^2[/tex]

[tex]x=0+14(7.14285)[/tex] | [tex]0=250-\frac{1}{2} (-9.8)t^2[/tex]

x = 99.9999 m       | [tex]-250=-4.9t^2[/tex]

                               | [tex]\sqrt{\frac{-250}{-4.9} } =\sqrt{t^2}[/tex]

                              | 7.14285s = t

Analysing the Question:

We are given:

height of the hot air balloon (h) = 250 m

horizontal velocity of hot air balloon (p) = 14 m/s

Since the balloon had no vertical velocity, the basket will drop vertically at a velocity of 0 m/s and gain its velocity due to acceleration

whereas the horizontal velocity of the balloon is 14 m/s, so the basket will have a horizontal velocity of 14 m/s when falling

there will be no change in the horizontal velocity of the basket since there is no force against the horizontal velocity of the falling basket

Time taken by the basket to reach the ground:

from the last section, we deduced that:

initial vertical velocity (u) = 0 m/s

time taken by the basket to reach the ground (t) = t seconds

acceleration of the basket due to gravity (a) = 10 m/s²

from the second equation of motion:

h = ut + 1/2*at²

replacing the variables

250 = (0)t + 1/2 * (10)(t)²

250 = 5t²

t² = 50

t = √50

t = 5√2 seconds   OR     7 seconds

Horizontal distance travelled by the basket:

Distance travelled = horizontal speed * time taken to reach the ground

Distance travelled = 14 * 7

Distance travelled = 98 m

Answer:

The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.

Answer:

Option B and C are True

Note: The attachment below shows the force diagram

Explanation:

The weight of the two blocks acts downwards.

Let the weight of the two blocks be W. Solving for T₁ and T₂;

w = T₁/cos 60° -----(1)

w = T₂/cos 30° ----(2)

equating (1) and (2)

T₁/cos 60° = T₂/cos 30°

T₁ cos 30° = T₂ cos 60°

T₂/T₁ = cos 30°/cos 60°

T₂/T₁ =1.73

Therefore, option a is false since T₂ > T₁

Option B is true since T₁ cos 30° = T₂ cos 60°

Option C is true because the T₃ is due to the weight of the two blocks while T₄ is only due to one block.

Option D is wrong because T₁ + T₂ > T₃ by simple summation of the two forces, except by vector addition.

Explanation:

Using the equation of motion S = ut+1/2gt² where;

S is the height of the table = 0.60m

u is the initial velocity = 0m/s

g is the acceleration due to gravity = 9.81m/s²

t is the time taken

Substitute

0.6 = 0+1/2(9.81)t²

0.6 = 4.905t²

t² = 0.6/4.905

t² = 0.1223

t = √0.1223

t = 0.3497

t≈0.35secs

Hence it will take 0.35seconds for a ball launched off the edge of these tables to reach  the floor

Answer:

B . The gravitational field strength of Planet X is Wx/m.

Explanation:

A ball of mass m is found to have a weight Wx on Planet X. Which of the following is a correct expression for the gravitational field strength of Planet X?

A . The gravitational field strength of Planet X is mg.

B . The gravitational field strength of Planet X is Wx/m.

C . The gravitational field strength of Planet X is 9.8  N/kg.

D . The gravitational field strength of Planet X is m.Wx.

Step 1: Given data

Mass of the ball: m

Weight of the ball on Planet X: Wx

Gravitational field strength of Planet X: g

Step 2: Determine which is a correct expression for the gravitational field strength of Planet X

According to Newton's second law, the acceleration (a) of an object is directly related to the net force (F) and inversely related to its mass (m), which is seen in the following expression.

a = F/m

In our case, the net force is represented by the weight of the ball on Planet X and the acceleration is that due to the gravitational field strength of Planet X. The resulting expression is:

g = Wx/m

Here, we are required to provide a correct expression for the gravitational field strength of planet X where a ball of mass m is found to have a weight Wx.

The mass of an object, m is a measure of the quantity of matter present in the object. Mass is therefore constant irrespective of location.

Wx = m × a

a = Wx/m

Read more:

https://brainly.com/question/21335480

Answer:

the answer is A The potential energy in the system is greatest at X.

Explanation:

i know things

Answer:

Disease are caused by micro organisms

All objects in the universe are attracted to one another

species evolved through natural selection

The scientific facts from the given list are,

Microorganisms that are too tiny to be seen with the bare eye are the primary cause of many illnesses.

The force of gravity draws all objects in the cosmos toward one another.

Natural selection is the process through which species change.

Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.

Microorganisms that are too tiny to be seen with the bare eye are the primary cause of many illnesses.

The force of gravity draws all objects in the cosmos toward one another.

Natural selection is the process through which species change.

Therefore options A, B, and C are scientific facts.

Learn more about the science here, refer to the link;

https://brainly.com/question/18186842

#SPJ2

Answer: its actually 0

Explanation: i read the khan academy hints and the answer is 0

yes the answer is 0 and if its not and have this graph its -2.0