Someone decode this please
My friend sended this he said it was a bit horror but yeah i need help with this

Answer:

a)20 m,2s

Explanation:

Given

Initial velocity=20 m /sec

g=10 m/s square

v =0m/s

h =?

t =?

now,

v = U +gt

=v=20 +10t

Or,10t=20

Or,t=20

10

therfore ,2 s.

Again,

h=ut -1 gt square

2

Or, h=20×2-1×10(2)square (multiply and cut )2×5 =10

; 2

Or,40-5×4

therefore , 20m

Answer:

i hope it helped U

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Answer:

In physical changes, no new materials are formed and the particles do not change apart from gaining or losing energy. ... Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. Only their arrangement, energy and movement change.

Explanation:

Answer:…..

Explanation:

The quantity of heat energy supplied to the water from the metal is 2520 J.

The quantity of heat energy needed to increase the temperature of one kilogram of a substance by one degree Celsius is known as the substance's specific heat capacity.

Here,

Mass of the water in the container, m = 50 g = 0.05 kg

Initial temperature of the water, T₁ = 20°C = 293 K

Final temperature of the water, T₂ = 32°C = 305°C

Specific heat capacity of water, C = 4200 J/kgK

The expression for the quantity of heat energy supplied to the water from the metal is given by,

Q = mcΔT

Q = mC(T₂ - T₁)

Applying the values of m, C, T₁ and T₂

Q = 0.05 x 4200 (305 - 293)

Q = 210 x 12

Q = 2520 J

Hence,

The quantity of heat energy supplied to the water from the metal is 2520 J.

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Answer:

Distance = 2m

Explanation:

Runner A : 1,75

Runner B : 0.71 ( divided speed over velocity for both & B)

Distance = 1,75 + 0,71 = 2,46 m

Is it right?

Answer:

Density is 8 g/cm³

Explanation:

[tex]density = \frac{mass}{volume} \\ [/tex]

mass » 80 g

volume » 10 cm³

[tex]density = \frac{80 \: g}{10 \: {cm}^{3} } \\ \\ = 8 \: {gcm}^{ - 3} [/tex]

Answer:

mass=80

volume=10

density=mass/volume

which is 80/10

so the density is equals to 10.

Answer:

99

Explanation:

Answer:

In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other

Answer:

mass is the quantity of matter inside the body

Answer:

The mass of a body is the quality of matter it contains

Answer:

0.0084×91=0.7644

Explanation:

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Answer:

If you want definition, here it is:

Dispersion is defined to be the spreading of white light into its full spectrum of wavelengths. Refraction is responsible for dispersion in rainbows and many other situations. The angle of refraction depends on the index of refraction, as we saw in The Law of Refraction.

Answer:

The atmosphere exerts pressure of about 10 power 5 and Nm power-2 or 760 mm of HG at sea level is known as standard atmospheric pressure

Answer:

(atm) unit of measurement equal to air pressure at sea level, about 14.7 pounds per square inch. Also called standard atmospheric pressure. atmospheric pressure. Noun. force per unit area exerted by the mass of the atmosphere as gravity pulls it to Earth.

Answer: the answer is d $19.95

Explanation:

chicken dinner: 6.95 x 3 = 20.85

burger: 5.75

20.85 + 5.75 = 26.6

26.6 divided by 4 (bc theres 4 ppl and the bill needs to be split equally)

26.6/4= 6.65

and since 3 friends are paying him back u gotta do 6.65 x 3 = 19.95

A student puts a beaker of warm water next to a beaker of cold water so that they touch it. the two statements that are true are the thermal energy will move from warm water to cold water and the thermal energy will move from air to cold water, therefore option B and option D are the correct statements about the given problem statement.

It is a temperature at which the pressure exerted by the external atmosphere is equal to the vapor pressure of the substance.

The boiling point depends on atmospheric pressure, temperature, bond strength, and vapor pressure of the liquid.

As the water is boiling it means it has more thermal energy contained in it than the surrounding air and the ice is present at zero degrees.

As we know that heat is always transferred from the higher thermal potential to the lower thermal potential. The warm water has a higher thermal potential; than the cold water and the surrounding air has a higher thermal potential than the cold water.

As per the given problem statement, a student puts a beaker of warm water next to a beaker of cold water so that they touch it. the two statements that are true are the thermal energy will move from warm water to cold water and the thermal energy will move from air to cold water, therefore option B and option D are the correct statements about the given problem statement.

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Answer:

please mark me brainliest

Explanation:

No, sound waves cannot travel in a vacuum. This is because sound waves are mechanical waves that need a medium (such as air and water) to travel. Sound in physics is defined as a vibration that propagates as an audible wave of pressure, through a medium such as a gas, liquid or solid.

Answer:

Divide by 1609

Explanation:

So to convert from m/s to m/s divide by 1609

The distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m

The kinetic energy of an object is the energy possessed by the body by virtue of its motion.

The gravitational potential energy (energy due to the virtue of its position) of a body is being converted to Kinetic energy once an object falls.

Using the law of conservation of energy according to the equation:

Kinectic Energy = Potential Energy

Since PE = mgh

KE = PE = mgh

Given the following parameters

KE = 100J

m = 2kg

g = 9.81m/s²

Required

Height h

Substitute the required values into the formula

100 = 2(9.81)h

h = 100/19.62

h = 5.097m

Hence the distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m

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Answer: Approximately 22 cm

=========================================================

Explanation:

The unstretched spring is 12.0 cm long. When adding a load of 5.0 N, it stretches to 15.0 cm. This is a displacement of 15.0 - 12.0 = 3.0 cm, which is the amount the spring is stretched.

Convert this displacement to meters (so that it fits with the meters unit buried in Newtons).

3.0 cm = (3.0)/100 = 0.03 m

Apply Hooke's Law to find the spring constant k

F = -kx

5.0 = -k*(0.03)

k = -(5.0)/(0.03)

k = -166.667 approximately

Now we must find the displacement x when F = 15 newtons

F = -kx

-kx = F

x = F/(-k)

x = -F/k

x = -15/(-166.667)

x = 0.089 approximately

x = 0.1

The displacement to one decimal place is about 0.1 meters, which converts to 100*0.1 = 10 cm

So the spring will be stretched to about 12cm+10cm = 22 cm

Answer:

Explanation:

like charges repel each other if one group of electrons has more mass it will push the other smaller mass of electrons away

Answer:

70

Explanation:

Answer:

9.722

Explanation:

35*1000÷1×60*60

35000÷3600

9.722

Answer:

hmmm i dont know....

Explanation:

i just wanted free point. TANKS YOU SIR!!

Answer:

atom has become cation

atom has lost 2 electrons

Explanation:

when atom loses electron they become positively charged and cation are positive ion

Answer: 0.9264 kg

Explanation: [I'll use "cc" for cubic centimeter, instead of cm^3.

The volume is 6cm*4cm*2cm = 48 cm^3 (cc).

Density of Au is 19.3 g/cc

Mass of gold = (48 cc)*(9.3 g/cc) = 926.4 grams Au

1 kg = 1,000 g

(926.4 grams Au)*(1 kg/1,000 g) = 0.9264 kg, 0.93 kg to 2 sig figs

At gold's current price of $57,500/kg, this bar is worth $53,268. Keep it hidden from your lab partner (and instructor).

Answer:

The girl exerts more pressure.

Explanation:

Pressure can be defined as the force exerted normally or perpendicularly per unit area.

i.e P = F/A

Girls

Area of the heel = 1cm² = 10^(-4) m²

Force = mg = 50 × 10 = 500N

Pressure =

[tex] \frac{500}{10 ^{ - 4} } [/tex]

[tex] = 5 \times {10}^{6}[/tex]

Elephant

Area = 250cm² = 2.5 x 10^(-2)b m²

Force = mg = 40000N

Pressure =

[tex] \frac{40000}{2.5 \times {10}^{ - 2} } [/tex]

[tex] = 1.6 \times {10}^{6} [/tex]

Answer:

Pascal's law states that the pressure exerted anywhere in a confined incompressible liquid is transmitted equally in all directions irrespective of the area on which it acts and it always acts at right angles to the surface of containing vessel.

have a great day sister

a ) v = v o + a t  ( the acceleration will be negative )

9.50 = 16.0 + a * 1.2

a * 1.2 = -16.0 + 9.50

a * 1.2 = - 6.5  

a = - 6.5 : 1.2

a = - 5.4167 m/s²

F = m * a = 950 kg * 5.4167 m/s²

F = 5,145.8 N ( the average force exerted on a car during braking )

b ) d = v o - a t² / 2

d = 16.0 * 1.2 - ( 5.4167 * 1.2² / 2 ) =

= 19.20 - 3.90 = 15.30 m

Potassium Sulphate :-

[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf K}\put(0,0){\bf 1}\put(4,3){\sf SO_4}\put(4,0){\bf -2}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]

[tex]\boxed{\sf K_2SO_4}[/tex]

Sodium chloride:-

[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf Na}\put(0,0){\bf 1}\put(4,3){\sf Cl}\put(4,0){\bf -1}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]

[tex]\boxed{\sf NaCl}[/tex]

Ammonium Chloride

[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf NH_4}\put(0,0){\bf 1}\put(4,3){\sf Cl}\put(4,0){\bf -1}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]

[tex]\boxed{\sf NH_4Cl}[/tex]

Silver Oxide

[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf Ag}\put(0,0){\bf 1}\put(4,3){\sf O}\put(4,0){\bf -2}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]

[tex]\boxed{\sf Ag_2O}[/tex]

Answer:

1.02m

Explanation:

Apply Principle of conversation of energy,

mgh = 1/2 Ke²