Calculate the radiation dosage (in grays) for a 63‑kg person who is exposed for 5.0 s to a 3.0 Ci source of beta radiation. Assume that 100% of the radiation is absorbed and that each beta particle has an energy of 1.5×10−13 J.

Answer:

space = 66.24 [m]

Explanation:

To solve this problem we must remember that the average speed is defined as the relationship between a space traveled over a certain time.

[tex]Av = \frac{space}{time}[/tex]

where:

space [m]

Av = average velocity = 3.6 [m/s]

time = 18.4 [s]

[tex]space = 3.6*18.4\\space = 66.24 [m][/tex]

Answer:

3622.5 K

Explanation:

The radiation of red giant star is 800nm.

We need to find the surface temperature of the star. Let it is T.

Using Wein's displacement law to find it as follows :

[tex]\lambda=\dfrac{C}{T}[/tex]

C is constant an T is temperature

[tex]T=\dfrac{C}{\lambda}\\\\T=\dfrac{2.898\times 10^{-3}}{800\times 10^{-9}}\\\\ T=3622.5\ K[/tex]

So, the surface temperature of the star is 3622.5 K.

Answer:

77852x∧100 kgms

Explanation:

Answer:

a. Scalar quantity

b. Scalar quantity

c. Scalar quantity

Explanation:

Generally, all physical quantities can be categorized into vector or scalar. Vector quantities can be described by both magnitude and direction, while scalar quantities can be described only by magnitude.

a. 20 degrees Celsius is a measure of a definite value of temperature, thus it is a scalar quantity. As temperature has no direction.

b. 256 byte is the storage capacity of an electronic device. It is a scalar quantity since it is described only by magnitude and no direction.

c. 4000 Calories is an amount of energy in a given substance. Thus, it is a scalar quantity.

Answer:

d = 2.3 x 10⁻⁴ m = 0.23 mm

Explanation:

In a Young's Double Slit experiment the distance between two consecutive minima is given as:

Δx = λL/d

for, the distance between the 1st and 3rd minima it will become:

2Δx = 2λL/d

where,

2Δx = distance between 1dt and 4rd minima = 3 mm = 0.003 m

λ = wavelength = 690 nm = 6.9 x 10⁻⁷ m

L = Distance of Screen = 50 cm = 0.5 m

d = width of slit = ?

Therefore,

0.003 m = 2(6.9 x 10⁻⁷ m)(0.5 m)/d

d = 6.9 x 10⁻⁷ m/0.003 m

d = 2.3 x 10⁻⁴ m = 0.23 mm

Answer:

The phenomenon is known as refraction. The correct option is B

Explanation:

Refraction is defined as the property of a change in the direction of light, when it passed from one medium to another. In the process of refraction, the direction to which the rsy of light follows changes as well as the velocity, but the frequency remains the same along the line of propagation.

The extent of propagation is determined by the nature of the medium allowing the propagation.If a ray of light hits the surface of a sheet of glass, some light will be reflected by the surface of the glass. However, much of the light will pass through the glass, because glass is transparent. This effect also o view with mediums such as water.

The reason why the light rays bends away from its normal direction is that light slows down when it passes from the less dense air into the denser glass or water.

Other properties of light includes:

--> light travels in a straight line

--> light can be reflected

--> light can be diffracted

--> light can be polarized

Answer:

The magnitude of the magnetic force on the proton is 9.532 x 10⁻¹⁷ N

Explanation:

Given;

speed of proton, v = 850 m/s

magnitude of magnetic field, B = 0.7 T

Charge of proton, q = 1.602 x 10⁻¹⁹ C

The magnitude of the magnetic force on the proton;

F = qvB

F = ( 1.602 x 10⁻¹⁹)(850)(0.7)

F = 9.532 x 10⁻¹⁷ N.

Therefore, the magnitude of the magnetic force on the proton is 9.532 x 10⁻¹⁷ N

The simple machines can help make work easier by working quicker than the people and making other peoples jobs easier.

Explanation:

I hope this helped.

Answer:

The average power of the engine of the sports car is 56.32 kW

Explanation:

Given;

mass of the sports car, m = 1100 kg

initial velocity of the sports car, u = 0 m/s

final velocity of the sports car, v = 32 m/s

time of motion, t = 10 s

The kinetic energy of the car is given by;

K.E = ¹/₂m(v² - u²)

K.E = ¹/₂mv²

K.E = ¹/₂ x 1100 x 32²

K.E = 563200 J

The average power of the engine of the sports car is given by;

Pavg = Energy / time

Pavg = 563200 / 10

Pavg = 56320 W

Pavg = 56.32 kW

Therefore, the average power of the engine of the sports car is 56.32 kW

Answer:

90J

Explanation:

Given parameters:

Weight of package  = 75N

Height  = 1.2m

Unknown:

Potential energy  = ?

Solution:

Potential energy is energy due to the position of a body. It is mathematically expressed as;

  Potential energy = mgh

m is the mass

g is the acceleration due gravity

h is the height

       The weight is mg

 Potential energy  = 75 x 1.2 = 90J

Answer:

6.2 x 10^6

Explanation:

The 6 at the end is an exponent the carrot is the symbol

Answer:

6.2*10^7 miles

Explanation:

Answer:

In the case of the table and the book, the gravitational attraction is absolutely negligible, since they are both so tiny. The force that the table experiences because of the book is what is being called normal force. The table then exerts an equal and opposite force.

Explanation:

Explanation:

The law of motion states that for every action there is an equal yet opposite reaction. so that mean that the book is being acted on by another force which would be the table. It does not move because the table is acting on it with 8n of upward force creating an equilibrium keeping the book at rest.

Answer:

I don't think your appendix can explode because you ate too much honestly. It's not even possible to eat so much that your appendix explodes, and if you're feeling any pain it definitely isn't because your appendix is about to explode, believe me. Also you could just type it into the internet, that'd be a much faster solution.

the outer shell of the star are blown off with big clouds of gas and dust which is know as a nebula

Answer:

Money is transferred from your account to creditors' accounts

Explanation:

When performing online activities that require payments of bills on a computer. The very moment you decided to pay your bills using a computer, your money will be transferred immediately from your account to creditors' accounts. This will imply that the transaction is successful and you have paid your bills.

Hence, in this case, the correct answer is "Money is transferred from your account to creditors' accounts."

Answer:

U become g**

Explanation:

Ur a**

Answer:

Inertia

Explanation:

Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity.

Answer:

Eeeeeeeeeeeeeeeeeeeeeeeeeee

Answer:

The speed of these two sea creatures just after their collision is 5.55 m/s.

Explanation:

Given;

mass of the whale, m₁ = 1235 kg

initial speed of the whale, u₁ = 6.4 m/s

mass of the seal, m₂ = 189 kg

initial speed of the seal, u₂ = 0

let their final speed after collision, = v

Apply the principle of conservation of linear momentum;

m₁u₁ + m₂u₂ = v(m₁ + m₂)

(1235 x 6.4) + (189 x 0) = v(1235 + 189)

7904 = 1424v

v = 7904 / 1424

v = 5.55 m/s

Therefore, the speed of these two sea creatures just after their collision is 5.55 m/s.

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 4 \times {8}^{2} \\ = 2 \times 64[/tex]

We have the final answer as

Hope this helps you

Mass of toy the car = 4 kg

Velocity of toy the car = 8 m/s

Kinetic energy of an object is the energy that it possesses due to its motion.

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity.

Formula of Kinetic energy:

[tex] \boxed{ \bf{KE = \dfrac{1}{2}mv^2}}[/tex]

KE → Kinetic energy of the Object (J)

m → Mass of the Object (kg)

v → Speed of the Object (m/s)

By substituting values in the formula, we get:

[tex] \rm \longrightarrow KE = \dfrac{1}{2} \times 4 \times 8^2 \\ \\ \rm \longrightarrow KE = \dfrac{1}{2} \times 4 \times 64\\ \\ \rm \longrightarrow KE = 2 \times 64 \\ \\ \rm \longrightarrow KE = 128 \: J[/tex]

[tex] \therefore [/tex] Kinetic energy of the toy car = 128 J

Answer:

Water in dal lake is test for any heavy metals and pollutant, sewage and drainage system are also monitored for the same.

Explanation:

Answer:

V = I R    

expression does not depend on the frequency, so when changing this quantity does not change the voltage or the current in the circuit.

Explanation:

In a purely resistive circuit, the Ohm relation, m for which

          V = I R

We see that the previous expression does not depend on the frequency, so when changing this quantity does not change the voltage or the current in the circuit.

This does not happen in circuits with capacitors or inductors where there is an explicit dependence on frequency.

Answer:

The length of the bolt in millimeters is 722.2 mm

Explanation:

Given;

length of the bolt in centimeters, = 72.22 cm

The length of the bolt in millimeters is given by;

Multiply the length by 10

= 72.22 cm x 10

= 722.2 mm

Therefore, the length of the bolt in millimeters is 722.2 mm

Answer:

Air and water i think

Explanation:

Cause Air =25% and water=25% so that equals 50%

Answer:

1. 60/90

2.67/63

Explanation:

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 = 750 × 7.8

We have the final answer as

Hope this helps you

Answer:

Nicki's Average Speed is 6 km

Explanation:

If Nicki rides her bike at a constant speed for 1 hour, that means that Nicki will stay at a constant rate for another 2 hours.

Thus your answer: 6 km

Answer:

true! : )

(i underlined the place where the answer is the other information is just as important but if you do not want to read it you do not have to)

Explanation:

Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases. the greater the mass, the greater the gravitational pull. gravitational pull decreases with an increase in the distance between two objects. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.