The graph below shows the velocity of a car as it attempts to set a speed
record.
Velocity vs. Time
1400
1300
1200
1100
1000
4 45
3
1 (s)
At what point is the car the fastest?
A. t = 1.0 s
B. t = 4.2 s
C. t = 3.0 s
D. t = 4.5 s

Answer:

A and B

Explanation:

The two conditions which results in the strongest electric force between charged objects are when they close together secondly, when the objects are conductors with balanced charges.

Electric force is the force generated between charged bodies. There are both repulsive and attractive electric forces. Like charges exerts a force of repulson between each other. Unlike charges will exert an attractive force between each other.

According to Coulomb's law of electric forces is directly proportional to the magnitude of charges and inversely proportional to the distance between them. Thus , when the objects are closer the greater force is exerted between them.

Insulators does not allow flow of free electrons and the electric force between them is weak. Whereas, when two conductors of unlike charges exerts strong electrostatic force of attraction. Hence, option B and C are correct.

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Answer:

The correct answer is false

Explanation:

Most of the energy produced today from wood to energy systems is related to woods used as fuels which are referred to as "woodfuel". Woodfuel could be in the solid form (as in firewood/fuelwood, charcoal and wood pellets), liquid form (bio-oil and bio-ethanol) and gaseous form (wood gas).

Woodfuel in the form of firewood is majorly used all over the world, particularly in developing countries, for cooking and in developed countries for making fire to regulate temperature.

NOTE: This answer assumes the question refers to energy produced from wood all over the world and not restricted to a particular country or location.

Answer:

true

Explanation:

just took the best its true

Answer:

True

Explanation:

I took the quiz and got it correct

Explanation:

hope this answer was helpful

Answer:

The answer is below

Explanation:

a) Given that the modulus of elasticity (E) = 317 GPa, to find the modulus of elasticity (in GPa) for the nonporous material ([tex]E_o[/tex]), we use the formula:

[tex]E_0=\frac{E}{1-1.9P+0.9P^2}\\\\where\ P=4.7\%=0.047,hence:\\\\ E_0=\frac{317}{1-1.9(0.047)+0.9(0.047)^2}\\\\E_0=347.3\ GPa[/tex]

b) If the porosity P = 11.1%, then the modulus of elasticity is:

[tex]E=E_0(1-1.9P+0.9P^2)=347.3(1-1.9(0.111)+0.9(0.111)^2)=278\ GPa[/tex]

The correct answer is Ammonia

Answer:

Cold water slows down dissolving

Cold water slows down dissolving. Hence, option (A) is correct.

The basic relationship between solubility and temperature is as follows: A solid will dissolve more readily at higher temperatures.

Likewise, a solid element dissolves more slowly at lower temperatures. This is all due to the solvent becoming more and more excited by the heat, making it easier for it to split or break apart entirely.

for while in gases The solubility of gases decreases more rapidly as temperature rises. A gas is more soluble in water when the temperature is lower.

Henry's law, which states that the gas becomes more soluble as the pressure above the liquid solution increases, summarizes another characteristic of gas solutes.

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Answer:

Convection

Explanation:

Convection is heat transfer due to a density differential within a fluid. As water's temperature increases in the presence of a heat source, it will become less dense and rise. As it moves up and away from the heat source, it cools and becomes more dense and sinks.

Answer:

k = 49 N/m

Explanation:

Given that,

Mass, m = 250 g = 0.25 kg

When the mass is attached to the end of the spring, it elongates 5 cm or 0.05 m. We need to find the spring constant. Let it is k.

The force due to mass is balanced by its weight as follows :

mg=kx

[tex]k=\dfrac{mg}{x}\\\\k=\dfrac{0.25\times 9.8}{0.05}\\\\k=49\ N/m[/tex]

So, the spring constant of the spring is 49 N/m.

Answer:

465 feet because 93*5 = 465, btw that was 1993 not 1933

Explanation:

Answer:

true plz mark me as the brainliest

Explanation:

Answer:

n

Answer:

there's no picture

Explanation:

and what would the question be anyways?

Answer:

what is the question

Explanation:

Answer: More specifically, the term is typically defined as a period when gross domestic product (GDP) declines for two consecutive quarters. This prevailing line of thought was popularized by economist Julius Shiskin in 1974.

Explanation:

plz give me brainliest

Answer:

salt

Explanation:

                                                      - large doses may lead cells to be cancerous        

                                                      - causes mutations in the DNA

           - natural background radiation   e.g. - cosmic rays

           - medical radiation   e.g. - CT scans & medical x - rays

           - man - made radiation   e.g. - airport security scanners

          - x - ray beam filters

          - digital x - ray detectors

          - technologies reduce radiation doses in radiography &  

            mammography

hope that helps !!

Yes, there are human health risks caused by exposure to x-rays, X-rays may cause damage to cells in the body, and large doses may lead cells to be cancerous, causing mutations in the DNA.

X-rays are electromagnetic waves with minimal wavelengths and high frequencies. Their wavelengths typically range from 10⁸ to 10¹² meters, and their corresponding frequencies are typically between 10¹⁶ and 10²⁰ hertz (Hz).

Charged particles are frequently accelerated (or decelerated) to produce X-rays; examples include an electron beam striking a metal plate in an X-ray tube and an electron beam circulating in a synchrotron particle accelerator or storage ring. The energy level spacing in the atoms can also be used to determine the discrete wavelengths of X-rays that highly excited atoms can emit.

X-rays may cause damage to cells in the body, large doses may lead cells to be cancerous, causing mutations in the DNA.

Common sources of exposure (or overexposure) :

The technology, device, or behavior that can be used for protection, or to decrease exposure are:

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Answer: if 5N is applied for 5 seconds then it would move at a constant speed for one second then decrease in speed

Answer:

c near water

Explanation:

because well let's say you were out in the rain or ur at an outdoor pool swimming and all of a sudden lighting strikes the water while ur in it...... then you would barely be living bc electric touched water

Answer:

240Nm

Explanation:

Given parameters:

Force on the bank vault = 300N

Distance to the plane of the vault  = 0.8m

Unknown:

Torque = ?

Solution:

Torque is the component of force that causes an object to rotate about an axis;

  Torque  = Fr x sinФ

Here Ф  = 90°

         r  = distance

   Torque  = 300 x 0.8 x Sin 90°

    Torque  = 240Nm

Answer:

a) letting in-flowing and/or out-flowing tide flow through turbines in a dam.

Explanation:

Tidal power makes use of the energy from the tidal force and wave action in order to generate electricity. it is a predictable source of energy.

Tidal Barrages

The system allows tides to enter, seawater flows via the dam and is trapped into the basin when the tides subside and system’s gates close.

When the tides start to move out, the gates in the dam are opened up this consist of turbines and water begins to flow out, hitting the turbines this eventually turn to produce energy.

Power is produced when the tidal range, which is the difference between low and high tide, has to be more than 5 meters.

Answer:

its obviously D if all the other says "incorrect answer" XD

Explanation:

Answer:

d :D

Explanation:

We are given:

Mass of the Paint bucket (with paint) = 7000 grams

Mass of the paint bucket (without paint) = 500 grams

Volume of Paint in the Bucket = 5000 cm³

Mass of Paint in the Bucket:

To get the mass of the paint in the bucket, we will subtract the mass of the bucket from the mass of the paint bucket (with paint)

Mass of Paint = Mass of Paint bucket (with paint) - Mass of the paint Bucket (without paint)

Mass of Paint = 7000 - 500

Mass of Paint = 6500 grams

Density of the Paint:

We know that density = Mass / Volume

Density of Paint  = Mass of Paint / Volume occupied by Paint

Density of Paint = 6500/5000

Density of Paint = 1.3 grams / cm³

Answer:

63J

Explanation:

The question tells us that they both have a kinetic energy of 126 J. What we are required to get is the rotation kinetic energy of the ring

Total kinetic energy =

1/2mv² + 1/2IW²

For ring,

I = mr²

And v = Rw for pure rolling

The total kinetic energy

= 1/2mr² + 1/2mv²

= 126J

126/2

= 63J

The rotational kinetic energy of the ring is therefore 63J.

Thank you!

Answer:

If a zero is found between important digits, it is important. Zeros are also used as (not salient) holders to the left of digits if the number is in fact a decimal. Example from www.rpi.edu: , a mass of 42 g has two significant digits. Expressed in kilograms, the mass of 0.042kg should still have two significant digits.

Explanation:

Zeros are also used as (not salient) holders to the left of digits if the number is in fact a decimal. Example from www.rpi.edu: "A mass of 42 g has two significant digits. Expressed in kilograms, the mass of 0.042kg should still have two significant digits."

Hope this comes in handy, have a great day!

Answer:

A distance is equal to displacement

Explanation:

An object traveling in a straight line moving East will have its displacement value to be equal to the distance.

Displacement is the distance traveled in a specific directions.

Distance is the total length of path traveled.

 The displacement of the object is the value of the distance due east.

 The distance is the value of the length of path covered.

Explanation:

initial velocity (u) = 50m/s

final velocity (v) = 0m/s

i.e the ball stops for a while at its maximum height.

g = 10m/s^2

from the 1st equation of vertical upward motion:

v = u - gt

hence t = (v + u)/t

t = (0 + 50)/10

t = 50/10 = 5s.

C. 5s.

Answer:

c

Explanation:

(a) Initial velocity of ball (u)=50m/s, acceleration of ball =−g,

final velocity at the highest point (v)=0

So applying the 3rd equation of motion we get:

v  

2

=u  

2

−2gh  

max

​  

⇒0=50  

2

−2×10×h  

max

​  

⇒h  

max

​  

=  

20

2500

​  

=125m

(b) Let the time required to reach max height be t. Then applying 1st equation of motion we get:

v=u−gt

⇒0=50−10t

⇒t=5s

(c) Let speed at half of max height be V then:

V  

2

=50  

2

−2g  

2

125

​  

⇒V  

2

=2500−1250=1250

⇒V=  

1250

​  

=35.35m/s.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 10 × 2

We have the final answer as

Hope this helps you

Answer:

it will be B

Explanation:

Answer:

The energy decreased because heat resulted from the friction between the marble and the ramp.

Explanation:

I think its this answer because i think is has somthing to do with friction

Answer:

density of the sediment, size of the sediment, and velocity of the agent of erosion.

Explanation:

Have a nice day!

Answer: b., c., e.

Explanation: