PLEASE HELP!!! I need a good grade!

Answer:

1.) D. There is an equal and opposite force impacting the hand

2.) B. In all situations

3.) A. Velocity decreases to conserve momentum

4.) A. p=mv

5.) C. 100 kg*m/s

6.) C. The train cars move together in the direction the large car was moving

7.) D. m1v1+m2v2=0

8.) D. By drawing the vectors one right after the other

9.) B. Increase the mass and decrease the acceleration by the same numeric values

10.) D. The change in velocity over time

11.) B. The ball has no net force acting on it

12.) A. m1v1i+m2v2i=m1v1f+m2v2f

Explanation:

Did the practice

(1) The fighters wear padded gloves to protect their hands because there is an equal and opposite force impacting the hand.

(2) The two balls when collide in a closed system will exert equal and opposite force.

(3) When the mass of the object increases, the velocity of the object will decrease to conserve momentum.

(4) The equation for calculating the momentum of an object is P = mv

(5) The momentum of the ball is 100 kg.m/s

(6) The train cars move together in the direction the large car was moving.

(7) The conservation of momentum of two objects is [tex]m_1v_1 - m_2v_2= 0[/tex]

(8) The sum of two vectors can be found by  drawing the vectors perpendicular to each other.

(9) A closed system can be changed without changing the net force on the system by increase the mass and decrease the acceleration by the same numeric values.

(10) Acceleration is defined as the change in velocity over time.

(11) As ball rolls down at constant velocity, the ball has no net force acting on it.

(12) The conservation of momentum of the object is [tex]m_1v_1_i + m_2v_2_i = m_1v_1_f + m_2v_2_f[/tex]

(1)

According to Newton's third law of motion, action and reaction are equal and opposite.

The fighters wear padded gloves to protect their hands because there is an equal and opposite force impacting the hand.

(2)

Based on the principles of conservation of linear momentum, the two balls when collide in a closed system will exert equal and opposite force.

(3)

The principles of conservation of linear momentum is written as;

[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2[/tex]

when the mass of the object increases, the velocity of the object will decrease to conserve momentum.

(4)

The equation for calculating the momentum of an object is written as;

P = mv

(5)

The momentum of the ball is calculated as follows;

P = mv

P = 50 x 2

P = 100 kg.m/s

(6)

For inelastic collision, the collided two objects move in the same direction after collision usually in the direction of heavier object.

The train cars move together in the direction the large car was moving.

(7)

The conservation of momentum of two objects is written as;

[tex]m_1v_1 = m_2v_2\\\\m_1v_1 - m_2v_2 = 0[/tex]

(8)

The sum of two vectors can be found by  drawing the vectors perpendicular to each other.

(9)

A closed system can be changed without changing the net force on the system by increase the mass and decrease the acceleration by the same numeric values.

(10)

Acceleration is defined as the change in velocity over time.

(11)

At constant velocity , acceleration = 0

∑F = ma

∑F = m x 0

∑F = 0

Thus, as ball rolls down at constant velocity, the ball has no net force acting on it.

(12)

The conservation of momentum of the object is written as;

[tex]m_1v_1_i + m_2v_2_i = m_1v_1_f + m_2v_2_f[/tex]

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Answer:

180

Explanation:

i think

Answer:

B)Lead is a solid at 310 °C

Explanation:

The melting point of a substance refers to that temperature in which the substance changes state from solid to liquid. The melting point of a substance, which is usually a temperature value, is that actual temperature the change of state occurs.

According to this question, the melting point of Lead (Pb), which is naturally a solid metal, is 327.5°C. This means that LEAD (Pb) will only change to its liquid state at exactly 327.5°C and above. Therefore, at a temperature of 310°C, which is lower than lead's melting point, Lead element will still be a solid.

Answer: The correct answer is B. Lead is a solid at 310

Explanation:

Answer:

r =  255.68 m

Explanation:

When a body moves in a circular path, an acceleration, due to constant change in its direction, is developed, known as centripetal acceleration. The centripetal acceleration acts towards the center of the circular path. The formula to calculate the centripetal acceleration is given as follows:

ac = v²/r

where,

ac = centripetal acceleration = 22 m/s²

v = tangential speed = 75 m/s

r = radius of curve = ?

Therefore,

22 m/s² = (75 m/s)²/r

r = (75 m/s)²/(22 m/s²)

r =  255.68 m

Answer:

0.616

Explanation:

hve a wonderful weekend :) stay safe

Answer:

A seesaw

Explanation:

Answer:

a seesaw

Explanation:

Answer:

The rock takes 1.22 seconds to hit the ground

Explanation:

Free Fall Motion

A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is g = 9.8 m/s^2.

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The distance traveled by a dropped object is:

[tex]\displaystyle y=\frac{gt^2}{2}[/tex]

If we know the height h from which the object was dropped, we can find the time it takes fo hit the ground:

[tex]\displaystyle t=\sqrt{\frac{2y}{g}}[/tex]

[tex]\displaystyle t=\sqrt{\frac{2\cdot 6}{9.8}}[/tex]

[tex]t=1.22\ sec.[/tex]

The rock takes 1.22 seconds to hit the ground

The time taken for the rock to hit the ground from the roof top is 1.1 seconds.

Given the data in the question;

Since the rock was initially at rest

Time taken for the rock to hit the ground; [tex]t = \ ?[/tex]

To determine the time taken for the rock to hit the ground, we use the second equation of motion:

[tex]s = u + \frac{1}{2}at^2[/tex]

Where s is the height or distance, u is the initial velocity, t is time taken and a is acceleration due to gravity( since the rock will be under gravity, [tex]a = g = 9.8m/s^2[/tex] )

We substitute our values into the equation

[tex]6m = 0 + [ \frac{1}{2}\ *\ 9.8m/s^2\ * t^2 ]\\\\6m = 4.9m/s^2 \ * t^2\\\\t^2 = \frac{6m}{4.9m/s^2}\\\\t = \sqrt{\frac{6m}{4.9m/s^2}} \\\\t = 1.1s[/tex]

Therefore, time taken for the rock to hit the ground from the roof top is 1.1 seconds.

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Answer:

5-2 / 1.8 = 1.66m/s

Explanation:

acceleration = vf-vi / t

vf= 5m/s

vi= 2m/s

t= 1.8 s

Answer:

Fun fact

An apple, potato, and onion all taste the same if you eat them with your nose plugged

Explanation: yes

Answer:

This is True

Explanation:

I just did this exact unit in bio last week I hope this helps ;)

Answer:

Her speed is 1.1 m/s, and her velocity is 0 m/s

Explanation:

Speed = Distance covered/Time

Given

Distance = 400m

Time = 6minutes = 6*60 = 360 secs

Substitute the given parameter into the formula;

Speed = 400/360

Speed = 1.1m/s

Since the track is a circular track, the displacement will be zero. She is only moving in a circular path (no direction)

Velocity = Displacement/Time

Velocity = 0/3600

Velocity = 0m/s

Hence her speed is 1.1 m/s, and her velocity is 0 m/s

Answer: Her speed is 1.1 m/s, and her velocity is 0 m/s

Explanation:

Answer:

The Sun shines by turning hydrogen into helium in its core.

Explanation:

This process is called nuclear fusion. Fusion happens when lighter elements are forced together to become heavier elements. When this happens, a tremendous amount of energy is created.

Answer:

The various organelles increase the energy used by the cell.

Explanation:

The various different parts of a cell, called as organelles, are beneficial to the cell in different ways such as energy production, protein synthesis, heredity information and packaging of proteins.

An organelle is a specialized part of the cell which serves a specific purpose within the cell. There are various organelles present within a cell and these organelles also vary depending on what kind of cell we are talking about, whether it be a plant or animal cell such as chloroplast and vacuole.

The different organelles in the cell perform different functions such as ribosomes synthesize proteins, mitochondria synthesize ATP, chloroplast involved in photosynthesis, and nucleus contain heredity information of the cell.

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Answer: false

Explanation:

You have to make sure it doesn’t stay wet

Answer: the force applied to the object and the distance the object move Work can be calculated with this equation: Work equals Force x Distance.

Explanation:

Answer:

Explanation:

To find how long it took the ball to reach the end we use the formula

[tex]t= \frac{d}{v} \\ [/tex]

where

t is the time

d is the distance

v is the velocity

From the question

d = 18 m

v = 7.5 m/s

We have

[tex]t = \frac{18}{7.5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:Density = 7.5 g/ml (By putting the given values.) [ The ratio of the mass to volume is the density, that's why the unit of the density is also the ratio of the unit of mass to the unit of volume. ] Hence, the density of the object is 7

Explanation: Google

Answer:

I think 50%

Explanation:

Because the efficiency of a machine is always less than 100%. And efficiency of a machine is 75%.

So, if 15% input work is lost due to friction then efficiency is maybe 50%.

Answer:

Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems.

Explanation:

This is what your experiment was intended to demonstrate or investigate. "As temperature rises, honey's viscosity falls."

The experiment appears to investigate the relationship between honey viscosity and temperature, and after reading the question.

You must look at your experimental results here; it's likely that you discovered that viscosity does indeed drop as the temperature rises.

The final task at hand is to list the challenges and issues you encountered throughout the experiment and make suggestions for how to address them in order to conduct future experiments that are more successful.

Therefore, the temperature has a considerable influence on viscosity, however, the particular substance also affects this relationship.

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Answer:

x = A sin w t         for SHM where w = angular frequency

sin w t = x / A = .12 / .15 = .8    where w t is the angle in degrees

w t = 53.1 deg       (w itself is in rad / sec)

since v = A w cos w t  

then v / x = w cos w t / sin w t = w / tan w t

w = v / x * tan 53.1 = 1.7 / .12 * tan 53.1 = 18.9 /sec

Also for SHM    w = (k / m)^1/2

m = k / w^2 = 75 / 18.9^2 = .21 kg

Answer:

Two hundred fifty kilometer 250 km

Answer:

The term ideal machine refers to a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, wear, or other inefficiencies. Hope this helped :))

Explanation:

The strong force is that force which cause the basic pieces of an atom to hold together. The weak force is radiation; this force is instrumental in things decaying. Electro-magnetism is the charged field which surrounds iron based materials or objects.

Force make objects movable and to change their state. Various kinds of forces in nature balances altogether every processes in nature. The energy we gain or lost is due to some kind of force and resultant displacement.

Force is an external agent acting on an object to change its state of motion or to deform it. Force is a vector quantity and is characterized by its magnitude and direction. There are various kinds of forces such as gravitational force, magnetic fore, frictional forces, nuclear force etc.

Its due to gravitational force by earth  that we are standing on the ground. We experience a weight due to this effect. Similarly the rotating current in the earth core generates the magnetic force of earth.

Every objects need a force to change its state or rest or motion. Similarly, the work done in any fields is the result of any force applied on the system.

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Answer:

16m + 25m + 16m = 57m

the car travelled 57 m