In the Position versus Time graph of an object moving in a straight line, what is the change in position in the fourth hour?
A) Zero
B) 15 miles
C) 35 miles
D) 75 miles

Answer:

In 1836, Scottish chemist, James Marsh, did the first application of this forensic science technique. This test was actually used successfully in a murder trial at that time.

Explanation:

I hope that is what you were asking

Answer: London , United Kingdom

Explanation:

In 1836, Scottish chemist, James Marsh, did the first application of this forensic science technique.

Answer:

From Coulomb’s Law of electrostatics the force of attraction or repulsion between two charged bodies is inversely proportional to the square of the distance between their two centers.

If the distance between them is doubled then the force is one-fourth of the original force.

If the distance between them is halved then the force is four times than the original force.

Explanation:

Answer: A

Biology

Explanation:

Psychological researchers study genetics in order to better understand the biological factors that contribute to certain human behaviour.

Because bodies with a particular genetic code are related in some certain behavioral forms and actions such as thought, feelings, attitude e.t.c

Answer:

The correct option is;

C. Electrons can act as both waves and particles

Explanation:

The quantum theory theory developed by Max Planck established that effect of radiation on a blackbody can be explained by the fact that energy can exhibit physical characteristics which implies that energy can have both wave-like and physical characteristics

With Planck's law, light and electrons are known as having wave particle duality, that is they can act as both waves and particles.

Answer:

The answer is A. Light is composed of discrete chunks that must be absorbed as a unit.

Explanation:

Hope this helps.

Answer:

False

Explanation:

Just finished the exam

The presence of 'free electrons' in a substance makes it a conductor of electricity. So, the statement is false.

The objects or substances that let the flow of electricity through them are known as conductors. The ability to carry heat is another benefit of conductors.

Here,

Since, every electron in an atom carries a negative charge, they can serve as our charge carriers. We can produce electricity if we can compel an electron to move by releasing it from its atom.

Current flowing through the conductors is caused by the free electrons present in them.

Free electrons are valence shell electrons with a weaker nucleus-electron interaction; as a result, they are free to travel in the metal, which acts as a conductor, and carry out current flow.

Hence,

The presence of 'free electrons' in a substance makes it a conductor of electricity. So, the statement is false.

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Answer: concave mirror

Explanation: There are different types of mirror. Plain, concave and convex mirror to mention a few. Among the mirrors mentioned above, concave mirror has highest focal point. The ability to focus all the beam of light incident on it at a point which can ignite a fire.

Using a small mirror to light paper or dry grass, the shape of mirror to use for this purpose is therefore a concave mirror.

Answer:

A signal is produced.

Radio waves are modulated and amplified.

Radio waves are amplified and demodulated.

A signal is seen, heard, or used.

Explanation:

Communication is the method of transmitting information between two or more participants. A radio communication network is a set of static and wireless radio equipment developed to facilitate an entity by enabling particular modes of communication such as one-to-many and one-to-one communication. Radio waves are being used to transmit information spatially from the sender to receiver, by modulating the radio signal in the transmitter. The above steps explains the loop of the radio communication system.

Answer:

A signal is produced- 1

A signal is seen, heard, or used- 4

Radio waves are modulated and amplified- 2

Radio waves are amplified and demodulated- 3

Explanation:

got is correct on edge 2020

Answer: 1.776933x10^7

Explanation:

Moment of inertia I = 8.26x10^36kgm^2

Mass of planet m = 6.54x10^22kg

Also, Planet is solid sphere so that, Moment of inertia is I = _2_ m

R^2= 0.4 R^2                                                                               5

Where R is radius of planet

Putting into calculation

We get,

I = _2_  m R^2

       5

8.26x10^36 = 0.4x6.54x10^22xR^2

8.26x10^14 = 2.616 R^2

R = 1.776933x10^7

The radius of the planet which has a mass of 6.54× 10²² kg and inertia of  8.26 × 10³⁶ kg/m² is 1.776933 × 10⁷.

Moment of inertia is a quantitative measure of the rotational inertia of a body. It is the opposition which the body exhibits to having its speed of rotation about an axis altered by the application of a torque.

Moment of inertia I = 8.26 × 10³⁶ kg

Mass of planet m = 6.54× 10²² kg

Also, Planet is solid sphere so that, Moment of inertia is I = 2/5 m R² = 0.4 mR²

where, R is radius of planet

Putting into calculation

We get,

I = 2/5 m R²

8.26 × 10³⁶ =  0.4 × 6.54 × 10²² × R²

8.26 × 10¹⁴ = 2.616 R²

3.15749235 × 10¹⁴ = R²

R = 1.776933 × 10⁷

Thus, the radius of the planet is 1.776933 × 10⁷.

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Answer:

15 miles per hour

Explanation:

45/3=15

Answer:

15 Hz or Hertz

Explanation:

To find the frequency of a wave, divide the velocity by the wavelength.

f=velocity/wavelength

We know the ocean wave is traveling at 45 meters per second, and it has a wavelength of 3 meters. Therefore, the velocity is 45 m/s and the wavelength is 3 m.

velocity=45

wavelength=3

Substitute these values into the formula.

f=45/3

Divide 45 by 3

f=15

Add appropriate units. Frequency uses Hertz or Hz.

f=15 Hertz

The frequency of the ocean wave is 15 Hertz.

Answer:

the anwser is d

Explanation:

you must have a north and south pole

Answer:

your anwser would be

D) two opposite poles

Answer:

2.72 m

Explanation:

Sound travels at a certain speed and has a frequency and wavelength. The relationship between the speed of sound (V), its frequency (f), and wavelength (λ) is the same as for all waves, it is given by the equation:

V = fλ

The speed of sound in air (V) is 334 m/s

Frequency of sound (f) = 123 Hz

Wavelength = λ

V = fλ

λ = V/f = 334/123

λ = 2.72 m

Answer:

0.3 m/s

Explanation:

0.5 - 0.2 = .3

Answer: C.

250 kg-m/s

Explanation:

Given that the

Mass M = 1,500 kg

Force F = 500 N

Time t = 0.5 seconds

From Newton's second law of motion which state that the rate of change of momentum is proportional to the applied force.

F = mV/t

Ft = mV

Where ft = impulse: the product of time and applied force

Substitutes force and time into the formula

Ft = 500 × 0.5 = 250 Ns

Answer:

c

Explanation:

just took the quiz

Answer: B

Explanation: 3912=10.2v +1/2(5.31)(10.2)^2 -> v≈ 356.45 (B)

Answer:

2.5m/s2

Explanation:

F=ma

a=F/m

a=15/6

a=2.5m/s2

Answer: Work done = 100Nm

Potential energy = 250 J

Find the remaining solution in the explanation

Explanation:

A person carrying a heavy weight of load without moving does no work. But the load will surely experience potential energy.

Work will be done when he or she covers a little distance.

If the weight of the load = 25 N and the distance covered is 4 metres, the workdone will be the product of the weight and distance covered. That is,

WD = F × d

WD = 25 × 4 = 100Nm

Let assume that the height of the man is 10 m tall.

The load will be experiencing potential energy of mgh. That is,

P.E = mgh

Since weight W = mg

Substitute weight and height into the formula

P.E = 25 × 10 = 250J

Answer: the answer is B

Explanation:

Answer:

The resulting wave would travel at 4.2 hertz.

Explanation:

Answer:

chemical equation

Explanation:

The general form of a chemical equation is: Reactants → Products. The reactants in a chemical equation are the substances that begin the reaction, and the products are the substances that are produced in the reaction

Answer:

The answer is D.

Explanation:

As shown in the picture, the measuring tube is collecting 10 cm of rain.

Answer:

D. 10cm

Explanation:

If you look closely, you can see the water is at the 10cm mark.

Answer: Its biceps

Explanation: the extension of the triceps are the biceps.

Momentum = mass × velocity

Momentum of bicycle = 30 × 10 = 300 kgms¯¹

Momentum of car = 300 × 0 = 0 kgms¯¹

Answer:

The extremely high energy of gamma rays allows them to penetrate just about anything. They can even pass through bones and teeth. This makes gamma rays very dangerous. They can destroy living cells, produce gene mutations, and cause cancer

Answer: V = 675000v

Explanation:

Electric potential V can be calculated by using the formula

V = Kq/r

Where

V = electric potential

q = charge = 15µC

K = Coulomb constant = 9 × 10^9Nm^2C^-2

r = 20 cm

Substitute all the parameters into the formula

V = (9×10^9 × 15×10^-6)/20×10^-2

V = 135000/0.2

V = 675000 volt

Answer: the loop will move up

Explanation:

Whenever an electric current cuts across magnetic field lines, a force is exerted on the current - carrying conductor

According to Fleming's left hand rule, the thumb is the direction of motion.

First finger is the direction of magnetic field, while the second finger is the direction of the conventional current.

When a current flow in the will, the wire will experience an upward force. And continue to rotate in an up - down direction. Therefore, the loop will move up.

Answer: The answer is weight.

Explanation:

Answer:

Gravitational field strength is the force experienced by a unit mass. Gravitational force is the amount of force acting on a body. It is the product of field strength times the mass under consideration. Gravitational pull is just a more colloquial name for gravitational force.

Explanation:

hope it helps u

what’s the difference between gravitational force & gravitational field strength?

Answer:

B

Explanation:

B makes the most sense in my opinion. because different discoveries have influenced many factors of the world

Answer: B.

Explanation:

A scientific discovery that has changed the world is Edward Jenner’s vaccine against the smallpox. His vaccine has been further modified to combat other diseases.

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Answer: B

R = 2 ohms

Explanation:

When resistors are connected in parallel, the equivalent resistance R will be less than the least resistance.

1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5

Since the 5 resistors are 10 ohms each, substitute them in to the formula

1/R = 1/10 + 1/10 +1/10 + 1/10 + 1/10

The LCM = 10

1/R = 5/10

Reciprocate both sides

R = 10/5 = 2 ohms

The correct option is B