x ray are harmful for human health​

The height at which the power shovel lifted the load is 6 meters.

Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;

Work done = force × distance

Given the data in the question;

Plug the given values into the above formula and solve for the height.

Work done = force × distance

24000kgm²/s² = 4000kgm/s² ×  h

h = 24000kgm²/s² ÷ 4000kgm/s²

h = 6m

Therefore, the value of the height is 6 meters.

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Answer:

7.3 g/cubic cm

Explanation:

You divide the mass by the volume to calculate the density of the metal.

146g ÷ 20cm³ = 7.3g/cm³

Answer:

87kg

Explanation:

2244.6kg divided by 25.8 m = 87 kg

Answer:

87kg

Explanation:

momentum formula= p=mv

rearrange the formula ==> m=p/v

2244.6/25.8= 87kg

The uniform movement allows finding the results for the helicopter displacement during the 10 s is: 700 m

Kinematics studies the motion of bodies, finding relationships between the position, velocity and acceleration of the body, in the special case that the acceleration is zero, it is called uniform motion and is described by the equation

          \(v = \frac{\Delta s}{t}\)

Where v is the average velocity, Ds is the displacement and t is the time

          Δs = v t

They indicate that the average speed is 70 m / s and the travel time is t=10.0s

Let's calculate

          Δs = 70 10.0

          Δs = 700 m / s

In conclusion using the uniform movement we can find the results for the helicopter displacement is: 700 m

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The magnitude of the helicopter's displacement is 700 meters.

Given the following data:

To find the magnitude of the helicopter's displacement:

Velocity can be defined as the rate of change in displacement (distance) with time.

Also, velocity is a vector quantity and as a result of this, it has both magnitude and direction.

Mathematically, velocity is given by the formula;

\(Velocity = \frac{displacement}{time}\)

Making displacement the subject of formula, we have:

\(Displacement = velocity\) × \(time\)

\(Displacement = 70\) × \(10\)

Displacement = 700 meters.

Therefore, the magnitude of the helicopter's displacement is 700 meters.

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True. A zoom lens is a lens that has a variable focal length, which allows the photographer to zoom in or out by adjusting the lens.

The focal length of a lens is the distance between the lens and the camera’s image sensor when the lens is focused at infinity. A focal length of 75mm to 150mm would be considered a telephoto zoom lens, which is commonly used for portrait photography, sports, and wildlife photography. The longer the focal length, the narrower the angle of view, which means that the photographer can capture distant objects in greater detail. However, a longer focal length also means that the lens will be heavier and more expensive. It is important to note that not all zoom lenses have the same range of focal lengths, and some lenses may have a fixed focal length.

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The magnitude of the linear acceleration of the pack can be calculated using the following equation:a = (T - Fr) /m where a is the magnitude of the linear acceleration of the pack,T is the tension force of you on the pulley,Fr is the frictional force, and m is the mass of the pack.Substitute the given values to the formula:a = (T - Fr) / ma = (266.3 - Fr) / 23.4.

The frictional force can be determined using the moment of inertia of the pulley.I = mr²I = 2.85 kg-m²m = I / r²m = 2.85 / 0.43²m = 15.57 kgFr = maFr = 15.57 × aa = (266.3 - 15.57a) / 23.4Solve for a by multiplying both sides by 23.4:23.4a = 266.3 - 15.57a23.4a + 15.57a = 266.3a = 266.3 / 39.97a = 6.66 m/s².

Therefore, the magnitude of the linear acceleration of the pack is 6.66 m/s².If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius, it will be harder to hold the pack.

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The independent variables are held constant during an experiment. Hence, option (d) is correct.

In mathematical modelling, statistical modelling, and experimental sciences, there are dependent and independent variables.

Dependent variables get their name because, during an experiment, their values are examined under the assumption or requirement that they are dependent on the values of other variables due to some law or rule (for example, a mathematical function).

In the context of the experiment under consideration, independent variables are those that are not perceived as dependent on any other factors.

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Vehicles equipped with disc brakes incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors, commonly called a top hat parking brake.

The top hat drum style of parking brake system is called the top hat rotors because of how big the middle part is compared to regular rotors.

In this type of parking brake system, the vehicle is equipped with disc brakes which incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors.

Thus, vehicles equipped with disc brakes incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors, commonly called a top hat parking brake.

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It would weigh less bc the higher you are the less gravity there is.

Rods and cones are the light-sensitive cells located on the retina of the eye. The retina is the innermost layer of the eye that contains the photoreceptor cells responsible for detecting light and initiating the visual process.

Rods are the more numerous of the two types of photoreceptor cells and are primarily responsible for vision in low-light conditions. They are highly sensitive to light but do not distinguish color. Instead, they provide us with black-and-white or grayscale vision.

Cones, on the other hand, are responsible for color vision and visual acuity. They are less sensitive to light and are concentrated mainly in the central part of the retina called the fovea. Cones allow us to perceive colors and provide detailed vision, especially in bright light conditions.

Together, rods and cones play a crucial role in our visual perception, allowing us to see and interpret the world around us.

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Answer:

The particle moves to the right when 0 ≤ t < a

Explanation:

Since at any time t≥0 its position is given by x(t) = 12(a−t)², the particle moves to the right if x(t) > 0

So,  x(t) > 0 ⇒ 12(a−t)² > 0 ⇒ (a−t)² > 0

So, (a−t)² > 0

taking square-root of both sides, we have

√(a−t)² > √0

⇒ (a−t) > 0

⇒ a > t

Since t ≥ 0 ⇒ a > t ≥ 0 ⇒ 0 ≤ t < a

So, the particle moves to the right when 0 ≤ t < a

Sure! Here are the steps for calculating the velocity and distance traveled by the car after 50 seconds :

Step 1: Calculate the velocity using the equation:

\(v = u + at\)

where:

- \(v\) is the final velocity

- \(u\) is the initial velocity (0 m/s, as the car starts from rest)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(v = 0 + (3 \, \text{m/s²}) \times (50 \, \text{s})\)

Step 2: Calculate the distance traveled using the equation:

\(s = ut + \frac{1}{2}at^2\)

where:

- \(s\) is the distance traveled

- \(u\) is the initial velocity (0 m/s)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(s = 0 \times (50 \, \text{s}) + \frac{1}{2} \times (3 \, \text{m/s²}) \times (50 \, \text{s})^2\)

Now, let's simplify these equations:

\(v = 3 \times 50\)

\(s = \frac{1}{2} \times 3 \times 50^2\)

Calculating the results:

\(v = 150\) m/s

\(s = 3750\) meters

Therefore, after 50 seconds, the car will have a velocity of 150 m/s and would have traveled a distance of 3750 meters.

1. To calculate the potential difference between points B and A (VB-VA), we use the formula:

Potential difference = Electric field * Distance

Here, the electric field is given as 2000 N/C and the distance between points A and B is 2 cm (0.02 meters). Therefore,
VB-VA = 2000 N/C * 0.02 m = 40 V

So the potential difference between points B and A is +40 V (Option b).

2. To find the factor by which the distance between the two charges should be increased to maintain the same force, we use the formula for the electrostatic force between two charges:
F = k * (Q * q) / D^2

When the magnitudes of the charges are increased, we have:
F = k * (6.4Q * 9q) / (x * D)^2, where x is the factor we need to find.

Since the force remains the same, we can equate the two equations:
k * (Q * q) / D^2 = k * (6.4Q * 9q) / (x * D)^2

Canceling the constants and charges, we get:
1 / D^2 = 57.6 / (x * D)^2

Now, we solve for x:
x^2 = 57.6
x ≈ 7.6 (to the nearest 0.1)

So, the distance between the two charges should be increased by a factor of approximately 7.6 to maintain the same force between them.

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If an asteroid had an orbit with a semimajor axis of 4 au, it would take approximately 8.0 years for it to orbit once around the sun.

According to Kepler's third law of planetary motion, the square of the orbital period of a planet or asteroid is proportional to the cube of its semimajor axis. Mathematically, it can be expressed as T^2 ∝ a^3, where T is the orbital period and a is the semimajor axis of the orbit.

To find the period of an asteroid with a semimajor axis of 4 AU, we can use the formula T^2 = (4 AU)^3, which gives us T^2 = 64 years^2. Taking the square root of both sides gives us T = 8 years, which is the approximate time it would take for the asteroid to complete one orbit around the sun.

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Answer:

Radioactive Dating

Explanation:

To get the age range of rocks or fossils, researchers usually make use of radiometric dating technique which is also called radioactive dating. Now, this radioactive dating is based on the principle of comparison between the abundance that's observed from a naturally occurring radioactive isotope including its decay products, with the use of known decay rates.

Answer:

a) Strings of guitar (being played)

b) Heart-beat in a healthy person

c) Motion of an apple falling from a tree

Explanation:

a) The motion of the string of a guitar being played is the only motion involving simple harmonic motion.

b) All the other motions are circular motion except the heart beat in a healthy person, which is periodic.

c) The motion of an apply falling from a tree is the only motion under the complete influence of gravity from the onset till the end.

Answer:

Iron and nickel is what the center of earth is made of

Explanation:

.

The distance between first airplane and second airplane after 1.8 hours of their departure is 1598.22 meters.

The cosine formula for vector addition is -

|R|² = |A|² + |B|² + 2AB cosφ

Where - φ is the angle between vectors A and B.

Given is two airplanes that leave the airport at same time. The velocity of the first airplane is 690 m/h at a heading of 68.5°. The velocity of the second airplane is 590 m/h at a heading of 156°.

The length of the position vector of first airplane →

|OA| = velocity x time = 690 x 1.8 = 1242 miles.

The length of the position vector of second airplane →

|OB| = velocity x time = 590 x 1.8 = 1062 miles

Angle between vectors OA and OB →

φ = 156° - 68.5° = 87.5°

In the triangle ΔOAB, using the triangle law of vector addition, we get →

OA + AB = OB

AB = OB - OA

AB = OB + (- OA)

Now, using the formula for resultant of addition of two vectors →

AB² = (OB)² + (- OA)² + 2(OA)(- OB) cosφ

AB² = OB² + OA² + - 2(OA)(OB)cosφ

AB² = 11,27,844 + 15,42,564 - 2 x 1242 x 1062 x cos(87.5°)

AB² = 11,27,844 + 15,42,564 - 2 x 1242 x 1062 x 0.044

AB² = 26,70,408 - 1,16,072.352 = 25,54,335.648

AB = √25,54,335.648

AB = 1598.22 meters

Hence, the distance between first airplane and second airplane after 1.8 hours of their departure is 1598.22 meters.

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Answer:

thats ummm

Explanation:

law of inertia

Newton’s 1 law

Answer:

it is very hard but i am trying to help you.

Explanation:

Answer:

Final momentum after a head on collision is -2kgm/

Explanation:

  One ball moves to the right and the other moves opposite  and momentum is a vector quantity so that considering the direction

Initial momenta are        P₁=2x3=6kgm/s        P₂=4x(-2)=-8kgm/s      

Final momentum is the vector sum of P(final)= 6-8= -2 kgm/s

The velocity with which the feather strikes the ground of the planet is 7.63 m/s and the acceleration due to gravity on the surface of the planet is 5.125 \(m/s^{2}\).

As from the surface of the planet, under acceleration due to it's gravity, the feather takes 1.49 seconds to reach the bottom-end when dropped into a 69m deep crater.

As the motion of the feather dropped would follow the freefall conditions, we should first know the basic equations of motion:

(Assuming u as the initial velocity, \(v\) as the final velocity, \(t\) as time, s as displacement and \(a\) as the acceleration due to gravity in the equations)

s = u\(t\) + 1/2 \(a\)\(t\)²       .......(i)

\(v\)² = u² + 2\(a\)s          .......(ii)

\(v\) = u + \(a\)\(t\)                .......(iii)

The sign convention should be followed according to the given data.

For the question, u = 0 since the feather is dropped

s = 5.69 m;

\(t\) = 1.49 s

Putting the values in equation (i)

5.69 = 1/2 a × 1.49 × 1.49

11.38 = a × 2.2201

a = 5.125 \(m/s^{2}\)

Hence, the acceleration due to gravity for the planet is 5.125 \(m/s^{2}\)

Now, putting the values of a and t in equation (iii), we get

\(v\) = 5.125 × 1.49

  = 7.63 m/s

Hence, the feather hits the bottom of the crater at the speed of 7.63 m/s.

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The correct question is:

An astronaut on planet with no atmosphere drops feather into a 5.69m deep crater and records that the feather falls freely for 1.49s. What is magnitude of free-fall acceleration on the planet? With what speed does the feather strike the bottom of the crater?

Answer: Limiting reactant

Explanation:

The limiting reactant is a reactant will get completely consumed up in the reaction. This reactant being in low concentration will lead to the formation of limited amount of product.

In the given situation, since the butter cakes are required to be 3 sticks for making 3 cakes but only 2 cakes are available thus the butter stick is the limiting reactant.

Answer:

If an atom gains a neutron, the atom becomes an isotope, which means that it has the same atomic number (#of protons) but a different atomic mass because it has gained the mass of 1 neutron

Answer:

Derived units are derived from these 7 base units. Derived units are dependent on the base units and are not independent of each other. ... Mass has SI units of kg, distance is measured in m and t has the SI unit of second. Thus, SI unit of force is kg.