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Answer:

Gravitational POTENTIAL ENERGY is greatest at the highest point of a roller coaster.

Explanation:

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Answer:

Frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

Explanation:

The most appropriate measure is to tie back long hair to ensure it is safely secured and kept away from the experiment. The best answer is 3) tied back.

In laboratory settings, long hair poses a potential safety hazard due to the risk of hair getting tangled in equipment, chemicals, or flames. Therefore, it is important to tie back long hair to prevent it from coming into contact with hazardous substances or interfering with experiments.

1) Always neatly groomed and brushed and

2) held away from the experiment are good practices for general hygiene and cleanliness but may not adequately address the safety concern related to long hair in a laboratory setting.

4) cut short is not necessary as long as the hair is properly tied back and secured to minimize the risk of interference or contact with hazardous materials.

Thus, the most appropriate measure is to tie back long hair to ensure it is safely secured and kept away from the experiment. The best answer is 3) tied back.

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Explanation:

the rate at which someone or something moves or operates or is able to move or operate.

Answer:

∆p.e = mg∆h

Explanation:

Take height reference be h1 while height final be h2.

∆h = (h2 - h1)

m = m

g = g

•°• ∆p.e = mg(h2 - h1)

=> ∆p.e = mg∆h

Answer:

9.7 miles per second

Explanation:

divide 200 by 20.6

Answer:

As an object moves faster, its mass increases. ... Because masses approach infinity with increasing speed, it is impossible to accelerate a material object to (or past) the speed of light. To do so would require an infinite force.

Answer:

the equilibrant is equal in magnitude but opposite in direction.

Explanation:

In vector algebra, a resultant vector is a single vector that have the same effect as the effect of the net or algebraic sum of two or more vectors.

A resultant vector arises from finding the adding multiple vectors together.

When a group of vectors is replaced by a resultant vector, in order to keep the system of vectors at equilibrium, there is another vector which has the same magnitude as the resultant vector but acting in opposite direction to the resultant vector. This vector is called the equilibrant.

10. True

11. True

12. True

13. False

14. False

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Answer:

(C) 700 N

Explanation:

The given parameters are;

The mass of the mountain climber, m = 100 kg

The angle formed by the rope with the horizontal, θ = 45°

The gravitational field strength, g = 10 N/kg

The weight of the man, W = m × g

∴ W = 100 kg × 10 N/kg = 1,000 N

At equilibrium, we have;

The downward force, the weight of the man, W = The upward force, the vertical component of the tension on the two halves of the rope

We have;

W = T × sin(θ) + T × sin(θ)

∴ 1,000 N = 2 × T × sin(45°)

Therefore, we have;

T = 1,000 N/(2 × sin(45°)) = 707.106781 Newtons

Therefore, the tension in the rope is closest to (approximately) 700 N.

Answer:

animal and plant

Explanation:

1st is animal

mitochondria

cell membrane

nucleus

endoplasmic reticulum

golgi body

plant cell

cell wall

cell membrane

chloroplast

nucleus

vacuole

endoplasmic reticulum

mitochondria

golgi body

Answer:

in probability theory, a balance equation is an equation that describes the probability flux associated with a Markov chain in and out of states or set of states.

Explanation:

F = ma

so, we can write it as;

= 5 = m × 20

= 5/20 = m

= 1/4 = m

= 0.25 kg = m

Answer:

Have you ever tried turning a glass of water upside down without spilling it? It seems impossible! Both kids and adults will be amazed by this experiment that appears to defy gravity.

With just a few simple household items, you can try this simple and fun science experiment where kids can get see the effects of air pressure in action. Printable instructions, a demonstration video, and an easy to understand explanation of how it works are included below.

Helpful Tip: Be sure to try this experiment over a sink or large container lest you accidentally make a BIG wet mess!

Answer:

Current = 3 Amperes

Explanation:

Given the following data;

Quantity of charge = 6 C

Time = 2 seconds

To find how many amps are moving through this wire;

Mathematically, the quantity of charge passing through a conductor is given by the formula;

Quantity of charge = current * time

Substituting into the formula, we have;

6 = current * 2

Current = 6/2

Current = 3 Amperes

Answer:

Critical angle

Explanation:

The angle of incidence when the refracted angle is 90°; we have the critical angle at this point. At this point, the refracted ray lies between the boundary between the two medium, this is the angle just before total internal reflection occurs, as the refracted angle exceeds 90°, all rays are reflected. Hence, we can conclude that it is the largest angle at which reflection can still occur.

Answer:

D) side to side

Explanation:

The frictional force act on the cube in the side to side direction. The friction force acts opposite to the direction of the motion of an object which reduces its speed or sometimes prevent it from moving from one place to another. In order to reduce the force of friction, the body has to move by rolling instead of sliding and use of lubrication on the surface on which the object moves.

Answer:

ln physics, Rest is the state at which an object is stationary or not moving with respect to its surroundings, and is said to be at rest. An example would be a book lying on a table.

Answer:

When an object does not change it's position with respect to time it is said to be at rest.

Explanation:

Example- A person sitting on a chair or a book lying on a table.

Please note there is no such thing as absolute rest.

Take the example of a person A sitting in a moving bus. If the observer is in the bus then to him person A is at rest. However if the observer is is outside the bus then person A is in motion as the bus is moving.

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Answer:

Gamma rays

Explanation:

gamma rays have the highest energy and the shortest wavelength

Answer:

the answer is B. 70 x 10-6 m

Explanation:

i'm doing the test rn

When converting from micrometers to meters, you have to divide the value by 1,000,000

= 70/1000000

= 7 ×10⁻⁵

Hence the thickness of the human hair is in meters is 7×10⁻⁵ m

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Answer:

B. The medium increases in temperature while remaining in the same phase

Explanation:

Good luck on all your tests and Exams!

The sound wave will increase when the medium increases in temperature while remaining in the same phase.

Sound waves are composed of compressions and rare factions. Sound is a mechanical wave hence it moves by the vibration of air particles.

As such, the sound wave will increase when the medium increases in temperature while remaining in the same phase.

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Answer:

Explanation:

This one-dimensional equation is just a fancy way of saying d = rt. Filling in:

d = 12.0(20) so

d = 240 m

Answer:

The one on the left

Explanation:

Answer:

The one on the left

Explanation:

Answer:

water cycle show the continuous movement of water with in the earth and atmosphere

Explanation:

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The water cycle is the process through which water evaporates from the earth's surface, rises into the atmosphere, cools and condenses into rain or snow in clouds, and then falls back to the surface as precipitation. Water that falls on land gathers in rivers and lakes, soil, and porous rock strata, and much of it goes back into the seas to evaporate. Water flows in and out of the system.

Answer:

C

Explanation:

Lifting heavy weights every day

Answer:

3000 kg*m/s

6000 kg*m/s

Explanation:

p = m*v

p = 150kg*20m/s

p = 3000 kg*m/s

p = 150kg*40m/s

p = 6000 kg*m/s

Answer is 29.1 mol or 525 g

Explanation:

Answer:

It often happens in a circuit which was conducting,and a switch is opened. Any inductance in the circuit will help the voltage increase due to back emf,and this can cause breakdown of the air insulation and an arc can form.

Explanation: