a body of mass 10 kg is moving at a constant speed of 20 m s over a frictionless surface the work done by the weight is
a)200j
b)100j
c)0j
d)300j​

The observer can see to a depth of approximately 3.76 m. we need to consider the concept of apparent depth in optics.

To determine the depth to which the observer can see, we need to consider the concept of apparent depth in optics.

The apparent depth of an object submerged in a medium is given by the formula:

Apparent Depth = Actual Depth / Refractive Index

In this case, the observer is looking horizontally at the edge of the swimming pool, so the angle of incidence is 90 degrees. The light rays coming from the bottom of the pool will undergo refraction as they pass from water (with a refractive index of 1.33) to air (with a refractive index of 1). To calculate the depth to which the observer can see, we need to find the apparent depth.

Given:

Actual Depth = 5 m

Refractive Index of water (n) = 1.33

Applying the formula:

Apparent Depth = Actual Depth / Refractive Index

Apparent Depth = 5 m / 1.33

Calculating the apparent depth:

Apparent Depth ≈ 3.76 m

Therefore, the observer can see to a depth of approximately 3.76 m.

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Answer:

101 N

Explanation:

Mass (M) = 10.1 kg

acceleration due to gravity (g) = 10 m/s²

Weight (w) = ?

Now

w = Mg

= 10.1 * 10

= 101 N

Hope it will help :)

According to the information in the fragment, it can be inferred that it is an example of how scientific development has consequences on pre-established theories and new areas are created in science (option C)

A scientific theory is a term to refer to a set of concepts and observations that are proposed as principles to explain a class of phenomena.

According to the above, the discovery of germs and their relationship with human diseases was an event that changed scientific theories about human diseases because it demonstrated a different explanation than what was believed up to that time.

So, the correct answer is option C because this event changed scientific theory and opened new fields for scientific study and research.

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Answer:

Explanation:

According to the information in the fragment, it can be inferred that it is an example of how scientific development has consequences on pre-established theories and new areas are created in science (option C)

What is a scientific theory?

A scientific theory is a term to refer to a set of concepts and observations that are proposed as principles to explain a class of phenomena.

According to the above, the discovery of germs and their relationship with human diseases was an event that changed scientific theories about human diseases because it demonstrated a different explanation than what was believed up to that time.

So, the correct answer is option C because this event changed scientific theory and opened new fields for scientific study and research.

what is the magnitude of the most stress that exists at the tip of an internal crack is 3,400 Mpa.

Magnitude is defined simply as “distance or amount.” It depicts absolutely the relative path or size in which an item moves within the sense of motion. it's miles used to explicit the scale or scope of something. In physics, value normally refers to distance or quantity. importance in Physics is a fundamental term in science. significance refers to the overall quantity or distance. regarding the components of movement, we will correlate magnitude with the dimensions and pace of an object even as it is in movement. the scale of the item or the amount is the magnitude of that unique item.

Magnitude is a degree of earthquake size and stays unchanged with distance from the earthquake. intensity, but, describes the degree of shaking resulting from an earthquake at a given location and reduces with distance from the earthquake epicenter. The value of the velocity vector is the instantaneous pace of the item. The direction of the speed vector is directed in the equal course that the item movements.

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An observer moving away from the source measures a lower frequency from one of the other two sources in doppler effects.

When a wave source and/or observer move in relation to one another, the Doppler effect happens, causing the observer to measure a wave frequency that is different from the frequency that the source is generating.

The sound waves that reach you from an approaching automobile have a greater frequency and a shorter wavelength. You notice a higher-pitched sound. The sound waves that reach you while the automobile travels away from you have a longer wavelength and a lower frequency. A sound with a lower pitch is audible. The number of full wave cycles per unit of time is the frequency of the wave that an observer measures.

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Answer:

b

Explanation:

The astronaut faces 1.71 rad/s angular velocity, 17.1 m/s linear velocity, 29.2 centripetal acceleration, 3 g's are experienced, and 2044 N of centripetal force. The torque experienced is zero

What is rotational motion?

An object is said to be in rotational motion when it is travelling in a circular route around a fixed axis. Centrifugal force is a radially outward force that the item experiences as a result of this motion.

The image given below explains the conversion. The torque is zero since there is no tangential force.

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The energy transformations in a projectile launcher involve the conversion of potential energy stored in the spring into kinetic energy of the ball, which is then transformed into other forms of energy as the ball moves through the air and interacts with other objects.

When a projectile launcher uses a spring to launch a ball, there are several energy transformations that occur:

1.Potential energy is stored in the spring as it is compressed. The amount of potential energy stored is given by the equation PE = (1/2) k x², where k is the spring constant and x is the distance that the spring is compressed.

2.When the spring is released, the potential energy is transformed into kinetic energy as the spring expands and pushes the ball forward. The kinetic energy of the ball is given by the equation KE = (1/2) m v², where m is the mass of the ball and v is its velocity.

3.As the ball travels through the air, it loses some of its kinetic energy due to air resistance, which is a form of non-conservative force. This energy is transformed into heat and sound energy.

4.When the ball hits a surface, some of its kinetic energy is transferred to the surface, causing it to deform or move. The remaining kinetic energy of the ball is transformed into other forms of energy, such as heat and sound energy.

Overall, the energy transformations in a projectile launcher involve the conversion of potential energy stored in the spring into kinetic energy of the ball, which is then transformed into other forms of energy as the ball moves through the air and interacts with other objects.

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The magnitude of the force exerted by the second wire is 16.5 N.

Apply cosine rule to determine the force on the second wire;

W² = F₁² + F₂² - 2F₁F₂ cos(θ)

where;

(4.3 x 9.8)² = 31²  +  F₂²  - 2(31) F₂(cos 122)

1775.78 = 961  +  F₂²  + 32.85F₂

814.78 = F₂²  + 32.85F₂

F₂²  + 32.85F₂ - 814.78 = 0

Solve the quadratic equation using formula method;

F₂ = 16.5 N

Thus, the magnitude of the force exerted by the second wire is 16.5 N.

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Answer:

yes it does exert a force, it pushes it up

Explanation:

this is called normal force

if it didn't exert a force the book would keep going down

according to newton every force has an equal amd opposite reaction

so the book exerts a force on the table and vice versa

hope this helped

Answer:

B.5.4m

Explanation:

Potential Energy=mass×gravity×height

8000=150×9.8×x

8000=1470x

x=8000/1470=5.4m

Given the fact that the friction between the van and the road would increase, then the sand bags would help.

The term friction has to do with the force that opposes the movement of an object on another. This in a sense implies that the frictional force is a resistive force. It can help to slow an object down and this is why the braking system of a car operates on the principle of friction.

Now, we are told that to negotiate a flat (unbanked) curve at a faster speed, a driver puts a couple of sand bags in his van aiming to increase the force of friction between the tires and the road.

The task is to determine if the sand bags would be of help. We have to note that the sand bags would help to increase the friction between the car and the road so it would definitely be of help.

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Answer:

500

Explanation:

30*300*5=500 so leuz multiple it by 2 the answer I'd

In order to determine the density of a cylinder, we need to know its mass and volume. The mass of the cylinder is given as 29.2 grams, but the volume is not provided. Without the volume, it is impossible to calculate the density of the cylinder.

As for whether or not the cylinder will float in water, that also depends on its density. If the density of the cylinder is less than the density of water (1), then it will float. However, without knowing the density of the cylinder, it is impossible to determine whether or not it will float in water.

Answer:

Option A. Decrease the charge of one Particles.

Option B. Increase the distance between the particles.

Explanation:

The electric force between two charged particles is related by the following equation:

F = Kq₁q₂ / r²

F is the force.

K is the electrical constant

q₁ and q₂ are the charges of the particles

r is the distance apart.

From the above formula, we can say that the force (F) is directly proportional to the product of the two charges and inversely proportional to their distance apart. This implies that as the charge of the particle increase, the force will also increase and as the charge of the particle disease, the force will also decrease.

On the other hand, if their distance apart is increased, the force will decrease and if their distance apart is decreased, the force will increase.

Note: if one of the charge disease, the force will also decrease and if one of charge increase, the force will also increase.

The ratio of time of flight for inelastic collision to elastic collision is 1:2

The given parameters;

Considering inelastic collision, the final velocity of the system is calculated as;

\(m_1u_1 + m_2u_2 = v(m_1 + m_2)\\\\m_1u_1 + 0 = v(m_1 + m_2)\\\\v= \frac{m_1u_1}{m_1 + m_2} \ -- (1)\\\\\)

The time of motion of the system form top of the table is calculated as;

\(v = u + gt\\\\v = 0 + gt\\\\v = gt\\\\t= \frac{v}{g} \\\\t_A = \frac{m_1u_1}{g(m_1 + m_2)} \ \ ---(2)\)

Considering elastic collision, the final velocity of the system is calculated as;

\(m_1u_1 + m_2 u_2 = m_1v_1 + m_2v_2\\\\m_1u_1 + 0 = m_1v_1 + m_2v_2\\\\m_1 u_1 = m_1v_1 + m_2v_2\)

Apply one-directional velocity

\(u_1 + (-v_1) = u_2 + v_2\\\\u_1 -v_1 = 0 + v_2\\\\v_1 = v_2 -u_1\)

Substitute the value of \(v_1\) into the above equation;

\(m_1u_1 = m_1(v_2 - u_1) + m_2 v_2\\\\m_1u_1 = m_1v_2 -m_1u_1 + m_2v_2\\\\2m_1u_1 = m_1v_2 + m_2v_2\\\\2m_1u_1= v_2(m_1 + m_2)\\\\v_2 = \frac{2m_1u_1}{m_1+ m_2} \ --(3)\)

where;

\(v_2\) is the final velocity of the block after collision

Since the bullet bounces off, we assume that only the block fell to the ground from the table.

The time of motion of the block is calculated as follows;

\(v_2 = v_0 + gt\\\\v_2 = 0 + gt\\\\t = \frac{v_2}{g} \\\\t_B = \frac{v_2}{g} \\\\ t_B = \frac{2m_1u_1}{g(m_1 + m_2)} \ \ ---(4)\)

The ratio of time of flight for inelastic collision to elastic collision is calculated as follows;

\(\frac{t_A}{t_B} = \frac{m_1u_1}{g(m_1 + m_2)} \times \frac{g(m_1 + m_2)}{2m_1u_1} \\\\\frac{t_A}{t_B} = \frac{1}{2} \\\\t_A:t_B = 1: 2\)

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Answer:

See Explanation

Explanation:

According to the diagram, the +3.5 nC arrow is in the positive direction whereas the +4 nC arrow is in the negative direction. Thus, the question defines the positive direction as the "right" and the negative direction as the "left." Since the instructions ask you to calculate the "force exerted on the +4 nC charge," the answer would be a negative force, or rather a force acting to the left.

Answer:

1. F= 66 N

2. M= 40 kg

3. A= 5.45454545 repeating

Explanation:

Answer:

6.32s (3sf)

Explanation:

First, we need to find the velocity by using this formula;

acceleration = (v-u)/t

Here, t will remain as an unknown as we will calculate it with another formula later on.

Substitute the values;

5 = (v - 0)/t

5t = v - 0

v = 5t + 0

∴ v = 5t

Now we have our velocity, we can finally calculate our t!

Using the formula;

v = d/t

Substitute the values;

5t = 200/t

5t × t = 200

5t² = 200

t² = 200/5

t = √40

∴ t = 6.32s (3sf)

I hope this helps! Let me know if I have any misconceptions or miscalculations! :)

Answer:B

Explanation:

.03 of an hr is 2 mins and if it takes 2 mins to drive 4 miles enter it in pace calulator you are going 120mph so the closest to 120 is 133mph

The kid is breaking the speed limit of 45 miles/hr since he is going at 133.3 miles/hr.

Speed is the ratio of distance travelled to time taken. It is given by:

Speed = distance / time

Since the distance to the mall is 4 miles, the time taken is 0.03 hours, hence the speed is:

Speed = distance / time

Speed = 4 miles / 0.03 hours

Speed = 133.3 miles/hr

Hence the kid is breaking the speed limit of 45 miles/hr since he is going at 133.3 miles/hr.

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The part of the microscope that the objectives are attached to is called the (C) nosepiece.

The nosepiece is a rotating mechanism located below the microscope's body tube. It holds the objectives, which are the lenses responsible for magnifying the specimen. The nosepiece typically has multiple positions, allowing the user to switch between different objective lenses for varying levels of magnification.

This convenient feature eliminates the need to manually remove and replace objectives when changing magnification. By rotating the nosepiece, different objectives can be brought into position above the specimen. This allows for quick and efficient adjustments in magnification without disrupting the viewing process.

Hence, the nosepiece plays a critical role in the microscope's functionality by providing a convenient way to switch between objectives and adjust the magnification level.

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Here is the complete question:

What is the name of the part of the microscope that the objectives are attached to? (Choose the best answer)

A. Ocular

B. Stage

C. Nosepiece

D. Arm

Answer:

3.5 m/s²

Hope this helps, have a nice day/night! :D

The group that will make the car travel closest to 5 m/s when it is at the bottom of the first will is of:

Group C.

The velocity that each car will assume at the bottom of the hill is given by the equation presented as follows:

v = square root (2gh + kx²/m).

The parameters are given as follows:

The parameters are given by the table in this problem, hence the velocities of each car are given as follows:

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Answer: group C

Explanation:

When an object travels in a circle, it experiences a centripetal force which is directed towards the center of the circle. This force is given by:

F = m * v^2 / r

where F is the centripetal force, m is the mass of the object, v is its speed, and r is the radius of the circular path.

In this case, the mass of the vehicle is 1500 kg, the speed is 22 m/s, and the radius of the circle is 85 m. Plugging these values into the equation above, we get:

F = 1500 kg * (22 m/s)^2 / 85 m = 906.35 N

So, the centripetal force acting on the vehicle is 906.35 N.

The direction of the centripetal force is towards the center of the circle, which provides the necessary force to keep the vehicle moving in a circular path.

In conclusion, when a 1500-kg vehicle travels at a constant speed of 22 m/s around a circular track that has a radius of 85 m, it experiences a centripetal force of 906.35 N, which is directed towards the center of the circular path. This force is necessary to maintain the circular motion of the vehicle and prevents it from moving in a straight line.

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In statistics, a regressor is a variable used in the estimation of a model to hold constant factors that could lead the estimated causal effect of interest to suffer from the omitted variable bias.

Omitted variable bias is a type of bias that occurs when a model excludes a relevant variable from the analysis. As a result, the coefficients of the included variables are estimated to include both the effects of the included variables and the effects of the omitted variable .A model with omitted variable bias will give incorrect estimates of the effects of the included variables and the effects of the omitted variable. It is essential to find regressors that can be used to control for the effects of omitted variables.

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The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.

When light beams from an object reflect off a mirror, they intersect with the picture of that thing, called an image. Real and virtual images are the two sorts of images.

The following parameters can be used to describe an image:

1. It is possible for an image to be real or virtual.

2. Left-right reversal is possible or not.

3. The image can be inverted or upright.

4. The image can be enlarged, shrunk, or made the same size as the object.

Plane mirrors provide virtual images that are upright, inverted left-right, the same distance from the mirror as the item, and the same size as the thing.

As a result, the best description of image production by a plane mirror is “a virtual picture is produced behind the mirror.”

The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.

Hence, option D is correct.

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Answer:

a. 10 years

b. 6 years

c. 12 years behind

Explanation:

speed of light c =  3x\(10^{8}\) m/s

distance of sirius from earth = 8 lightyears = 8 x c x 60 x 60 x 24 x 365 = 252288000c meters

speed of spaceship = 0.8c

time taken to reach sirius = distance covered divided by speed

t = d/s = 252288000c/0.8c = 315360000 sec

1 year = 60 x 60 x 24 x 365 sec = 31536000 sec

315360000 sec = 315360000/31536000 = 10 yrs

the time as observed by Goslo will be shorter than the real time as measured within the ship due to relativistic effects. using the relativistic relation for time dilation we have

t' = t\(\sqrt{1 - \frac{v^{2} }{c^{2} } }\)

since v = 0.8c

v/c = 0.8

where t' is the relativistic time as observed by Goslo,

t is the time within the ship

t' = 10 x \(\sqrt{1 - 0.8^{2} }\)  = 6 yrs

If speedo turns around immediately after reaching  sirius, his total distance will be 252288000c x 2 = 50457600c meter

time taken = 50457600c/0.8 = 630720000 sec = 20 yrs

time within the ship will be calculated from time dilation

t' = t\(\sqrt{1 - \frac{v^{2} }{c^{2} } }\)

t' = 20 x  \(\sqrt{1 - 0.8^{2} }\)  = 378432000 sec = 12 years behind

Aquimedes' principle allows to find the result for the apparent weight of the steel sphere is:

The thrust of a fluid on a body is given by Archimedes' principle which states that equal to the weight of the displaced liquid.

              B = \(\rho \ g \ V_{liquid}\)  

Where B is the buoyancy, p the density of the liquid, g the acceleration due to gravity and V the volume of the liquid.

In the attachment we see a free body diagram of the system, which is a representation of the forces without the details of the bodies.

            \(W_{apparent}\) = W- B

The volume of the liquid is the same as the volume of the sphere.

             \(V_{liquid} = V_{body} = \frac{4}{3} \pi r^3\)  

Let's substitute.

            \(W_{apparent} = m g - \rho_{liquid} \ g \ (\frac{4}{3} \pi r^3 )\)  

Let's calculate.

          \(W_{apparent} = 9.8 ( 38 - \frac{4}{3} \pi \ 1000 \ 0.04^3 ) = 9.8 \ 37.73\)  

         .\(W_{apparent} = 369.77 N\)          

In conclusion, using Aquimedes' principle, we can find the result for the apparent weight of the steel sphere:

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