Four balls with different masses are dropped simultaneously from the heights
shown.
Air resistance may be ignored.
Which ball hits the floor last?

The point on the graph that object is accelerating at a changing rate is point A.

Acceleration of an object is the rate of change of velocity with time.

a = Δv/Δt

where;

Thus, the point on the graph that object is accelerating at a changing rate is point A.

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Answer: Yes

Explanation:

Given

Martin initial speed is [tex]u=20\ m/s[/tex]

Stones is at 170 m ahead

Deceleration [tex]a=2\ m/s^2[/tex]

Using the equation of motion [tex]v^2-u^2=2as[/tex]

Insert the values

[tex]0-20^2=2\times (-2)s\\s=\dfrac{400}{4}\\\\s=100\ m[/tex]

So, it took 100 m to stop completely. Hence martin will be able to stop in time.

Answer:

C. Photosynthesis

Explanation:

The redox reaction given in this question is given as follows:

6H2O + 6CO2 → C6H12O6 + 6O2

In this reaction, water (H2O) reacts with carbon dioxide (CO2) to form glucose (C6H12O6) and oxygen (O2). This is the general equation for PHOTOSYNTHESIS process, which is the process whereby plants manufacture their food (sugar) by combining water and carbon dioxide.

In the equation above, water is oxidized into oxygen, while carbon dioxide is reduced into glucose. This makes it an oxidation-reduction (redox) reaction.

Answer:

D

Explanation:

A --> description of the Rutherford model of the atom

B --> application of half-life of radioactive isotopes

C --> nuclear fusions happen inside the sun

D --> weak nuclear force keeps the nucleus from coming apart

Answer:

You either need to lower the volume so the sounds intensity is lessened. Or you can pad the walls to absorb the sound rather than defect.

Explanation:

Sound intensity allows it to be heard further, but in an enclosed room it will start returning. Sound will deflect off of hard objects do to its interactions with solids. A softer and foamy material can dampen it.

Answer:

Al llegar a su equilibrio térmico ambas barran tendrán una temperatura de 53 grados centígrados.

Explanation:

Dado que una barra de aluminio que está a 78 grados centígrados entra en contacto con una barra de cobre de la misma longitud y área que esta a 28 grados centígrados, y posteriormente se lleva acabo la transferencia de energía entre ambas barras llegando a su equilibrio térmico, para determinar la temperatura a la que ambas barras llegarán se debe realizar el siguiente cálculo:

(78 + 28) / 2 = X

106 / 2 = X

53 = X

Por lo tanto, al llegar a su equilibrio térmico ambas barran tendrán una temperatura de 53 grados centígrados.

Answer:

The further implementations of nuclear power are limited because although nuclear energy does not produce CO2 the way fossil fuels do, there is still a toxic byproduct produced from uranium-fueled nuclear cycles: radioactive fission waste.

Explanation:

Answer:

Disadvantages of Nuclear Power

The further implementations of nuclear power are limited because although nuclear energy does not produce CO2 the way fossil fuels do, there is still a toxic byproduct produced from uranium-fueled nuclear cycles: radioactive fission waste.

Explanation:

Given :

Mass of person, m = 81 kg.

Area of high heal, A = 3.5 cm² = 0.00035 m².

To Find :

The pressure applied by the heal on the ground.

Solution :

We know, pressure is given by :

[tex]P = \dfrac{mass}{Area}\\\\P = \dfrac{81}{0.00035} \ N/m^2\\\\P = 231428.57 \ N/m^2[/tex]

Hence, this is the required solution.

Answer:

Oxygen or more precisely, the O-15 isotope.

Answer:

Explanation:

The Law of reflection states that angle of incidence equals angle of reflection.

So Angle of reflection is 14° also.

Answer:

Sunlight is a mixture of colors. When it passes through a glass prism, some of the light is bent, or refracted, more than other portions. And just as sunlight passing through a prism is bent, so is sunlight passing through drops of water. This produces an atmospheric solar spectrum in the sky for all to see: a rainbow.

Explanation:

Answer:

10-10x10+10=10-100+10=20-100=-80

Answer:

10 is the answer

Explanation:

10-10=0x10=0+10=10

Answer:

True.

Explanation:

In biology, selective breeding is the mechanism by which certain traits or a combination of traits are consciously selected in animal breeding or plant breeding and cultivation. Artificial selection is seen as a counterpart to natural selection, the mechanism by which, in nature, individuals are selected who are better adapted to their natural environment. Both processes have the same genetic principles and background.  Man selects the individuals with the desired traits to produce progeny, making these traits more and more common.

Answer:

m₀ = 96 g

Explanation:

First, we will calculate the no. of half-lives passed:

[tex]n = \frac{T}{T_{1/2}}[/tex]

where,

n = no. of half-lives passed = ?

T = Total time elapsed = 32 h

[tex]T_{1/2}[/tex] = Half-Life = 8 h

Therefore,

[tex]n = \frac{32\ h}{8\ h}\\\\n = 4[/tex]

Now, for the initial amount of element:

[tex]m = \frac{m_o}{2^n}\\\\m_o = m(2^n)[/tex]

where,

m₀ = initial amount of element = ?

m = current amount of element = 6 g

Therefore,

[tex]m_o = (6\ g)(2^4)[/tex]

m₀ = (6 g)(16)

m₀ = 96 g

Answer:

k is the energy of motion it increase with four of load you carry

Answer:

c. Protons and electrons

Explanation:

electrons carry out negative charge

protons carry out positive charges

Answer:

C. curved

Explanation:

researchers have shown that light can also travel in a curve, without any external influence

Answer: A.) concave lens

Explanation: i hope this helps shawtay :)

In general, a concave lens (also known as a diverging lens) is used to correct nearsightedness, as stated in "Take a Closer Look." Option C is correct.

A lens is an optical component that is used to refract (bend) and focus light. It is typically made of a transparent material, such as glass or plastic, and has a specific shape that allows it to alter the path of light as it passes through.

Here,
In general, a concave lens (also known as a diverging lens) is used to correct nearsightedness, as stated in "Take a Closer Look."

A concave lens is thinnest at the center and thicker at the edges, which causes light rays passing through the lens to diverge or spread out. By placing a concave lens in front of a nearsighted eye, the lens causes incoming light rays to diverge more before they reach the eye's lens, which then focuses them properly on the retina, resulting in clearer vision.

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Answer:The answer is D.

Explanation:

Answer:

longitudinal

Explanation:

Answer:

Explanation:

Answer:

160000 calories or 669440 Joules

Explanation:

Using the formula as follows;

Q = L × m

Where;

Q = amount of heat (J)

L = specific latent heat

m = mass (g)

* Latent heat (L) required for melting of ice is 80 calories/grams.

* Mass of ice in grams = 2kg × 1000 = 2000g.

Hence, Q = 80 × 2000

= 160000 Calories

1 calorie = 4.184J

160000 calorie = 160000 × 4.184

= 669440J

Answer:

W = 20 J

Explanation:

Given that,

The mass of a loaded sack, m = 1000 g = 1 kg

It falls down from the floor of a lorry 200 cm high, h = 2 m

We need to find the work done by the gravity. The work done by an object under the action of gravity is given by :

W = mgh

Substitute all the values,

W = 1 × 10 × 2

= 20 J

Hence, the required work done by gravity is equal to 20 J.

Is This Related To Physics ?

Answer:

[tex]v = u + at \\ 0 = 45 \sin(20) - 9.81 \times t \\ t = 1.56s[/tex]

Answer:

Silk fibre is obtained from silkworms

whereas artificial silk is obtained by

chemical treatment of wood pulp/cellulose.

Explanation:

Artificial silk, or rayon, is made from cellulose, obtained from cotton or wood pulp.

So any one of them in 2nd blank is correct.

Answer:

1.4 m/s/s (2.s.f)

Explanation:

The formula for centripetal acceleration is:

[tex]a=\frac{v^{2} }{r}[/tex], where v is velocity and r is the radius.

In the question we are given the information that the car has a mass of 1300kg, a velocity of 2.5m/s, and a turn radius of 8.5m which are all the values we need. Therefore we can simply substitute in the values to solve the question:

[tex]a=\frac{3.5^{2} }{8.5} \\a=1.4[/tex]

Therefore the centripetal acceleration of the car is 1.4m/s/s. (2.s.f)

Hope this helped!

Answer:

Solution given:

frequency[f]=x

velocity[V]=15000m/s

wave length=59m

we have

wave length=[tex] \frac{V}{f} [/tex]

59m=[tex] \frac{15000}{x} [/tex]

x=[tex] \frac{15000}{59} [/tex]=254.Hz

frequency=254Hz

Answer:

look at the picture i have sent