define electric potential at a point and find expression for it.​

Answer:

yes

Explanation:

because if you put a hot object in a cold place the energy from the hot object transfers to the cold air around it and will eventually get such a low temperature that it freezes.

Answer:

225 km north

Explanation:

Displacement = 350 km north + 125 km south

= 350 km north - 125 km north

= 225 km north

The number of people you will stack to reach the top of the CN Tower (553 m) is 316 people

We'll begin by converting 175 cm to m. This can be obtained as illustrated below:

100 cm = 1 m

Therefore,

175 cm = (175 cm × 1 m) / 100 cm

175 cm = 1.75 m

Thus, 175 cm is equivalent to 1.75 m

The number of people needed to be stacked to get to the top of the CN tower can be o btained asfollow:

Number of people needed = Height of tower / height of a person

Number of people needed = 553 / 1.75

Number of people needed = 316 people

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If object is changing its direction or speed of the object is changing then the object is said to be accelerating

Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing.

If an object is changing its velocity -whether the velocity is changing by a constant amount or by a varying amount  a constant amount - then it is an accelerating object.

Since, acceleration is a vector quantity and vector quantity have both magnitude and direction , this implies that if the body is changing its direction then also the object is said to be accelerating.

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Answer:

V = a * t         for uniform values

t = V / a = 10 m/s / (5 m/s^2) = 2 sec

Answer:

2

Explanation:

answer to the question is written up

The technique that is used to check the meaning of certain nonverbal behaviors of the speaker is looking away. The correct option is 4.

Nonverbal communication refers to the transmission of messages or signals via nonverbal platforms such as eye contact, facial expressions, gestures, posture, and body language.

It entails using social cues, kinesics, distance and physical environments/appearance, voice, and touch.

Nonverbal communication methods include your posture, facial expressions, and eye contact. We all use these cues in everyday conversation, even if unconsciously.

When people are thinking, hesitating, or speaking in a non-fluent manner, they tend to look away.

This behavior most likely serves two purposes. The first is to psychologically protect themselves from the embarrassment of being judged for not proceeding.

Thus, the correct option is 4.

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Answer:

See below

Explanation:

Downward force = weight = mg   where g = accel of gravity  9.81 m/s ^2

the tension force acting UPWARD to cause the elevator to accelerate upward is  F = T=m(a+g)   where ' a ' is the UPWARD acceleration ...the tension must be equal to

   the weight of the object + mass of object* acceleration

Answer:

60/80 x 30 = 1800/80 = 22.5 minutes. 22.5 minutes would be required to drive 30 km

Explanation:

1350 seconds

The depth of water in the tank is determined as 16.2 m.

Hydrostatic pressure is the pressure exerted by a fluid at equilibrium at any point of time due to the force of gravity.

The hydrostatic pressure of the water column is calculated as follows;

P = ρgh

where;

h = P/ρg

The given parameters;

h = (158579) / (1000 x 9.8)

h = 16.2 m

Thus, the depth of water in the tank is determined as 16.2 m.

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Answer: milliliters

Explanation:

centimeters and kilometers are measurements of length/distance. Kilogram is a measurement of weight, and millimeters is a measure of how much space an object takes up.

The equation describing the motion of the ball is determined as 15t + 4.9t².

This is the equation that describes the motion of an object is known as equation of motion.

The equation describing the motion of the ball is determined as follows;

y = vt + ¹/₂gt²

where;

y = 15t + 4.9t²

Thus, the equation describing the motion of the ball is determined as 15t + 4.9t².

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Answer:

A

Explanation:

When switches 1 and 2 are 'on'   or 'closed'   the circuit becomes a short

The water cycle follows the conservation of mass because just like matter, it changes its state but not destroyed.

Conservation of mass follows a rule which states that mass is neither created nor destroyed in chemical reactions. This simply means that for every chemical reaction, the mass of an element as a reactant will be the same at the end of the reaction.

From the given image, it can be observed that water can change its state from solid, liquid or gas in various phase transitions. These include the following:

Therefore, the water cycle follows the conservation of mass because just like matter, it changes its state but not destroyed.

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Answer:

The water cycle follows the conservation of mass because just like matter, it changes its state but not destroyed..

Explanation:

Answer:

185 units

Explanation:

Accel of gravity on Earth is 9.1 m/s^2

so weight on Mars would be   a fraction of this

  3.7  / 9.81  x 490 = 185 units

The maximum height achieved by the projectile shot at an angle of 26° with the horizontal is 155.79 meters.

What is Projectile Motion?

Projectile motion is a form of motion experienced by an object or particle that is projected near earth's surface and moves along a curved path under the action of gravity only.

Given is a projectile projected towards a target a distance 1270 m away. Initial velocity of the projectile is 125.6 m/s and makes an angle 26° with the horizontal.

The vertical component of the initial velocity →

u[y] = 125.6 sin(26°) = 125.6 x 0.44 = 55.26 m/s.

The horizontal component of the initial velocity →

u[x] = 125.6 cos(26°) = 125.6 x 0.89 = 111.78 m/s

Horizontal distance covered →

h[x] = 1270 m

Time taken to travel the horizontal range →

t = h[x] / u[x]

t = 1270 / 111.78 = 11.36 seconds

The time at which the height is maximum →

t [max] = 11.36/2 = 5.68 s

Using Newton's second law of motion for vertical direction -

S[y] = u[y] t + 1/2 a[y] t²

At t = t [max], the vertical height will be maximum -

S[y] (max) = 55.26 x 5.68 - 1/2 x 9.8 x 5.68 x 5.8 =

S[y] (max) = 313.87 - 158.08

S[y] (max) = 155.79 meters.

Hence, the maximum height achieved by the projectile shot at an angle of 26° with the horizontal is 155.79 meters.

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Answer:

II and III only

Explanation:

All III of those are true

The normal force on the stationary box pushed by the person is determined as 108.25 N.

Normal force is defined as the force that any surface exerts on any other object.

Normal force acts in opposite direction to the weight of an object.

The normal force on the box is calculated as follows;

Fn = mg cosθ

Fn = W cosθ

where;

Substitute the given parameters and solve for the normal force on the box,

Fn = 125 x cos30

Fn = 108.25 N

Thus, the normal force on the stationary box pushed by the person is determined as 108.25 N.

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The plasma exists in the condition of the excited state of matter.

The atmosphere stops being made of gas at a height of about 80 kilometers above the surface of the Earth. Instead, it is composed of ionized gas, which has a balanced ratio of neutral particles, positive ions, and electrons. The name of this state is plasma.

Despite being referred to as the "fourth state of matter," many astrophysicists believe it to be the "first" state because it was the first to form right after the Big Bang.

Energy is required to remove electrons from atoms in order to create plasma. Different types of energy, such as heat, electricity, or light, are possible (ultraviolet light or intense visible light from a laser). Plasmas combine back into neutral gas due to insufficient sustaining power.

Therefore the plasma state of matter exist in energized form and required energy to continue existing which can be provided by many source and form of energy.

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The particles of helium that were in the balloon will spread out evenly within the room.

When Sami pops a helium balloon at a birthday party then the particles of helium will just mix with air. The helium gases lighter dense than the air.

Air consists mostly of nitrogen and oxygen but there are also some traces of carbon dioxide  and noble gases in air, and helium is one of those noble gases.

Helium -

The particles of helium that were in the balloon will spread out evenly within the room.

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A state of character arises from the repetition of similar activities

Aristotle was a renowned scientist and philosopher. He has made significant contributions to society. He is renowned for his quotable sayings as well. Because of the correlation between the states of character and the distinctions between them, the behaviors we display must be of a specific type. States of character: The traits that "allow us to stand well or poorly in relation to the passions." Because: We are not commended and criticized only for having the ability to feel pleasure, grief, etc., virtues are not capacities.

Here in this quote, similar behaviors give birth to similar states of character

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Which of the following must happen in order for atoms to bond either ionically or covalently with one another?

a: The valence shells of all atoms must be filled after the bonding occurs

In order for atoms  to bond either ionically or covalently with one another the  valence shells of all atoms must be filled after the bonding occurs.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer: Hot weather concreting

Liquid nitrogen has also been used as a method for cooling concrete for over twenty years. ...

LN is produced by compressing and cooling nitrogen gas to a point below its evaporation point of about − 196 °C [− 320 °F].

Explanation:

Answer:

Explanation:

The position vector is obtained as r = 1.12 k + 0.58 i  + 1.22 j.

Let us consider the movement of the squirrel. We know that the position of the squirrel is defined by the equation;  r⃗ =[(0.280m/s)t+(0.0360m/s2)t2]i^+(0.0190m/s3)t3j^. We can see that this equation is what defines the position of the squirrel in the three cartesian dimensions as shown in the question.

We now have the position as required at the instant where t = 4.00 s being obtained as; r⃗ =[(0.280m/s)(4)+(0.0360m/s2)(4^2) ]i+(0.0190m/s3)(4)^3j. We now finally obtain the position of the body as required as being;

r = 1.12 k + 0.58 i  + 1.22 j

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The correct answer is 0.91 m/[tex]s^2[/tex].

The pace at which a body increases its velocity is what is meant by the phrase "acceleration." It always moves in the same direction as the body when it moves.

The acceleration of an object is equal to the net force exerted on it divided by its mass, or a = F m, in accordance with Newton's second rule of motion. When the mass of an item and the net force acting on it are known, the acceleration of that object can be determined using this equation for acceleration.

Force F = 75 ponds = 33.62 N

initial velocity y =0

mass m = 25 slungs = 364.848 kg

time t = 12s

Acceleration of the body,

Acceleration = F/m

Acceleration = 333.62/364.848

Acceleration = 0.91 m/[tex]s^2[/tex]

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Theacceleration of gravity is 9.8m/s²  so velocity = 5.269.

The rate at which an object's position changes when observed from a specific point of view and when measured against a specific unit of time is known as its velocity.

A body or item will have a pressure equivalent to atmospheric pressure when the external pressure pressing on it ceases to exist. In this instance, point A is under some pressure from the liquid. The pressure at point A becomes equal to atmospheric pressure when we tilt the container.

Given, h= 30.1 m

x = 13.06 m

g = 9.8

h = 1/2 gt^2

x = v √(2h)/g

13.06 = v √(2)(30.1)/9.8

13.06 = v (2.47847879613)

13.06 / 2.47847879613 = v

v = 5.269.

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