Please help me! I will give you a thanks!

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.

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.

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Answer:

I’m really not sur but I think it’s b

Explanation:

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:

Explanation:

its unbalanced

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.

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

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Answer:

Ice hockeyyyyyy

Explanation:

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:

It would be B. The Rope

Explanation:

I say this because the rope is transferring energy from one location to another. Now, I could be totally wrong on this but I think this is right lol.

Answer:

The answer is B the rope.

Hope this helps <3 ;)

Answer:

C

Explanation:

Given that a liquid at rest in a fixed container exerts a force perpendicular to the wall of the container. Two students make claims about the microscopic cause of this force. Student A says that the force exerted by individual molecules as they bounce off the wall is always perpendicular to the wall. Student B says that the molecules may strike the wall at angles that are not perpendicular. Which student is correct and why?

The correct answer is option C

Student B . The molecules in a liquid are in random motion at the microscopic scale. For every atom that hits at an angle to one side of perpendicular, there is likely to be another atom hitting at the same speed at the same angle on the other side of perpendicular. On average the nonperpendicular components cancel

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:

google answers, i'm not 100% on how to type my own answer

Explanation:

Thaw food submerged under running water at a temperature of 70˚F (21˚C) or lower. The water flow must be strong enough to wash food particles into the overflow drain. In a microwave oven. You can safely thaw food in a microwave oven if the food will be cooked immediately.

The reason defrosting in water is preferable is because water conducts heat better than air. And the faster food is thawed, the better it tastes.

Answer:

The reason defrosting in water is preferable is because water conducts heat better than air. And the faster food is thawed, the better it tastes.

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

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Answer:

200m

Explanation:

Answer: 3.5 × 10^3

Explanation:

Explanation:

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

Answer:

h= 63.5 m

Explanation:

       [tex]\Delta h = \frac{1}2} * g* t^{2} = \frac{1}{2} *(-9.8 m/s2)*(3.6s)^{2} = -63.5 m[/tex]

        y₀ = h = 63.5 m

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]

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:

Using pythagoras theorem

Answer:

use the pythagorean theorem

Explanation:

Answer: A-p_Ex

Explanation: answer

Analysing the question:

We are given that the cat chases a rat on a 1m high table, this means that the height of the cat before falling is 1 m

The horizontal velocity of the cat after sliding off the table will not change in mid-air since there is no force to oppose it

We are given:

height of the cat before falling (h) = 1 m

Distance covered by cat after falling off the edge = 2.3 m

acceleration due to gravity (a) = 9.81 m/s²

initial vertical velocity of the cat (u) = 0 m/s

Since the cat will fall at a constant horizontal velocity, the time taken by the cat to reach the ground times the constant speed of the cat will be equal to the horizontal distance covered by the cat  

[ since time taken to reach the ground = time for which the constant horizontal velocity will be applied]

The above can simply be written as:

time taken by the cat to reach the ground * horizontal velocity = horizontal distance covered

Time taken by the cat to reach the ground:

From the second equation of motion

s = ut + 1/2*at²

replacing the variables with vertical components

1 = (0)(t) + 1/2 * (9.8)(t²)

1 = 4.9t²

t² = 1  / 4.9

t = 1 / √4.9

t = 0.45 seconds

Cat's horizontal velocity when it slid off the table:

Speed of cat = distance travelled / time taken

here, the distance is the horizontal distance covered by the cat after falling off the table

replacing the variables

Speed of the cat = 2.3 / 0.45 = 5.11 m/s

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:

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.

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Answer:

Explanation:

The object starts at 0

It moves to - 2

It stops

It then moves to + 6

+6 - 2 = + 4

The new position is 4.

Answer:

Vf=78

d=

Explanation:

vf=vi+at

=72+(2)(3)

=78km/hr

d=vit+1/2at^2

=(72)(3)+1/2 (2)(3)^2

=216+9

=225m

1) 26m/s

2) 69 m

Hi there !

1)

a = (v₂ - v₁)/t => at = v₂ - v₁ => v₂ = at + v₁

v₁ = 72km/h = 72000m/3600s = 20m/s

v₂ = 2m/s²ₓ3s + 20m/s

= 6m/s + 20m/s

= 26 m/s

2)

d = v₁t + at²/2

= 20m/sₓ3s + 2m/s²ₓ9s²/2

= 60m + 9m

= 69 m

Good luck !