If each index card weighs the same, this means that gravity is pulling each card down with the same amount of force as it falls. Why, then, do some card designs fall slower when released from the same height?

Average speed = total distance/time

That's 2.62 m/s .

You don't want average displacement. You want average velocity.

That's (displacement)/(time).

That's zero, because displacement = 0.

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:

Gamma rays

Explanation:

gamma rays have the highest energy and the shortest wavelength

Fundamental quantity : quantities which are independent on other physical quantity .

ex: length,mass,time, current, amount of substance, luminous intensity, thermodynamic temperature,

Derived quantity : quantities which are depend on fundamental quantities.

ex: Area, volume, density, speed, acceleration, force, velocity etc.

Answer:

The amount saved in a year is $ 278.6.

Explanation:

current, I = 0.275 A

Voltage, V = 120 V

cost = $ 0.20 per kWh

The energy spent in 1 year is given by

E = V I t

E = 120 x 0.275 x 365 x 24 x 3600

E = 1.04 x 10^9 J

1 kWh = 3.6 x 10^6 J

So,

E = 288.9 kWh

So, the cost is

C = $ 0.2 x 288.9 = $ 57.78

So, the amount saved = $ 336.384 - $ 57.78 = $ 278.6  

Answer is 29.1 mol or 525 g

Explanation:

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:

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:

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:

stagnant current

Explanation:

stagnant current because eit is

Answer:

Force = -91.7 Newton

Explanation:

Given the following data;

Mass = 47 kg

Time = 4.1 seconds

Initial velocity = 8 m/s

Since the object comes to a stop, its final velocity would be equal to zero.

To find the force required to bring it to stop;

First of all, we would determine the acceleration of the object;

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

Substituting into the equation;

[tex]a = \frac{0 - 8}{4.1}[/tex]

[tex]a = \frac{-8}{4.1}[/tex]

Acceleration, a = -1.95 m/s²

Next, we would determine the force required to bring the object to stop;

[tex] Force = mass * acceleration [/tex]

[tex] Force = 47 * -1.95 [/tex]

Force = -91.65 ≈ 91.7 Newton

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:

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:

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:

Answer:

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

Explanation:

hope this helps

have a great day/night :)

Speed = Distance/Time

Now,

35 = 120/t

35/120 = 1/t

120/35 = t

3.42 hours = t

Answer:

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

Explanation:

Hope this helps :)

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:

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.

>>> A plane mirror has a reflective surface that is flat (planar). The angle of reflection equals the angle of incidence for light rays striking a planar mirror. A virtual picture is a representation of an object created at the spot where light rays appear to originate.

Hope it helps

Answer:

any smooth surface which can return back the rays of light in to the same medium is called a plane mirror.

hope it helps

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:

Answer:

Explanation:

ADVANTAGES OF TISSUE CULTURE

There are several advantages to using the tissue culture process. We already mentioned its effectiveness in helping developing countries to increase food production, but what are some other advantages that may be relevant to you?

The new plantlets can be grown in a short amount of time.

Only a small amount of initial plant tissue is required.

The new plantlets and plants are more likely to be free of viruses and diseases.

The process is not dependant on the seasons and can be done throughout the year.

You need only a relatively small space to perform the process (ten times the plants in one-tenth of the space).

On a larger scale, the tissue culture process helps to supply the consumer market with new subspecies and variety.

People looking to cultivate challenging plants such as specific breeds of orchid find more success with the tissue culture process than traditional soil.

DISADVANTAGES OF TISSUE CULTURE

Tissue Culture can require more labor and cost more money.

There is a chance that the propagated plants will be less resilient to diseases due to the type of environment they are grown in.

It is imperative that, before being cultured, the material is screened; failure to pick up any abnormalities could lead to the new plants being infected.

While the success rate is high if the correct procedures are followed, success with the tissue culture is not a guarantee. There is still a chance that the process triggers a secondary metabolic chemical reaction, and the new explants or cells' growth gets stunted, or even die off.

Answer:

v = 24 m

Explanation:

Given that,

The x component of the vector = 12 m

The y component of the vector = 21 m

We need to find the magnitude of a vector. It can be solved as follows :

[tex]v=\sqrt{12^2+21^2} \\\\=24.18\ m[/tex]

or

v = 24 m

So, the magnitude of the vector is equal to 24 m.

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

Please see the link below for more information

https://brainly.com/question/8648951?referrer=searchResults

F = ma

so, we can write it as;

= 5 = m × 20

= 5/20 = m

= 1/4 = m

= 0.25 kg = m

Answer:

Area = 20 m²

Explanation:

Given the following data;

Force = 2500 N

Pressure = 125 Pa

To find the area on which it rest;

Mathematically, pressure is given by the formula;

[tex] Pressure = \frac {Force}{area} [/tex]

Making area the subject of formula, we have;

[tex] Area = \frac {Force}{pressure} [/tex]

Substituting into the formula, we have;

[tex] Area = \frac {2500}{125} [/tex]

Area = 20 m²

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:

C

Explanation:

Lifting heavy weights every day

Answer:

9.7 miles per second

Explanation:

divide 200 by 20.6

Answer:

The one on the left

Explanation:

Answer:

The one on the left

Explanation: