1. If a ball is rolling horizontally on the floor with a velocity of 2.5 m/s, what are the x and y
components of the velocity?
Vx =
Vy =

On a level ice surface, a 55-kilogram skater glides over it while being subject to a friction force of 11 newtons. The skater's acceleration is -0.2 m/s^2.

The force of friction acting on the skater can be calculated as follows:

friction = μ * N

where

μ = coefficient of friction between the ice and skates (assumed to be constant)

N = normal force, which is equal to the weight of the skater

N = m * g

where

m = mass of the skater (55 kg)

g = acceleration due to gravity (9.8 m/s^2)

By substituting the values, we get:

friction = μ * m * g = 11 N

Finally, the net force acting on the skater can be calculated as follows:

net force = friction = -11 N (opposite direction to motion)

The acceleration of the skater can be calculated using Newton's second law of motion:

a = F / m

= -11 N / 55 kg

= -0.2 m/s^2

The acceleration of the skater is -0.2 m/s^2.

For such more question on friction force

https://brainly.com/question/24386803

#SPJ4

Note: The correct question would be as bellow,

A 55-kilogram ice skater slides across a level ice surface and the force of friction acting on the skates has a magnitude of 11 newtons. Find the coefficients of static and kinetic friction between the skates and the ice.

Answer:

Measurement is called the process of finding exact quantity of a substances.

The horizontal and vertical forces required to hold the nozzle stationary are calculated as follows:
Horizontal force: FH = (1/2)*ρ*(A1 - A2)
Vertical force: FV = (1/2)*ρ*(v22 - v12)

The horizontal and vertical forces required to hold a stationary nozzle with liquid water flowing through it at 10°C can be calculated using Bernoulli’s equation. Bernoulli's equation states that the sum of all the static and dynamic pressure forces acting on a fluid flowing through a system is constant. Using this equation, the pressure forces can be calculated using the area of the nozzle (A1), the density of the water (ρ), the gravitational acceleration (g), and the velocity of the liquid flow (v):
P1 + ρ*g*h + (1/2)*ρ*v2 = P2 + ρ*g*h2 + (1/2)*ρ*v22
The horizontal force is equal to the difference between the static pressures P1 and P2. The static pressure P1 can be calculated using the area of the nozzle (A1) and the density of the water (ρ).
P1 = (1/2)*ρ*A1
The vertical force is equal to the difference between the dynamic pressures at heights h1 and h2. The dynamic pressure at height h1 is calculated using the velocity of the liquid flow (v) and the density of the water (ρ).
P1 = (1/2)*ρ*v2

for more such questions on forces

https://brainly.com/question/12785175

#SPJ11

After measuring thing x and finding an instrumental uncertainty on x of 0.5 cm and a statistical uncertainty of 0.8 cm, we : "take more data".

However, there is always some degree of uncertainty in measurements, and this uncertainty can come from many different places. Uncertainty analysis, or error analysis, is the process of assessing the degree of uncertainty related to a measurement result.

Mainly two factors contribute to the uncertainty : bias (related to accuracy) and the inevitable random variation that happens when taking repeated measurements (related to precision). The question of how biases and random variation from the measured quantities "propagate" into the uncertainty of the derived quantity must be addressed because both of these phenomena are likely to exist. The "propagation of error" is a common name for uncertainty analysis.

Find more about uncertainty at : brainly.com/question/16831906

#SPJ4

Answer:

Given that

speed u=4*10^6 m/s

electric field E=4*10^3 N/c

distance b/w the plates d=2 cm

basing on the concept of the electrostatices

now we find the acceleration b/w the plates  to find the horizontal distance traveled by the electron when it hits the plate.

acceleration a=qE/m=\(1.6*10^{-19}*4*10^3/9.1*10^{-31} =0.7*10^{15}\)=\(7*10^{14}\) m/s

now we find the horizontal distance traveled by electrons hit the plates

horizontal distance

\(X=u[2y/a]^{1/2}\)

=\(4*10^6[2*2*10^{-2}/7*10^{14}]^{1/2}\)

=\(3*10^{-2}\)= 3 cm

The time taken for the spider crawling at 630 ft/hr to travel through the 15 ft wide room is 42 hours

From the formula of speed, we can obtain a formula for calculating time as illustrated below:

Speed = Distance / time

Cross multiply

Speed × time = Distance

Divide both sides by speed

Time = Distance / speed

Using the above formula, we can obtain the time taken from the spider to travel through the room. Details as follow:

Time = Distance / speed

Time = 630 / 15

Time = 42 hours

From the calculation made above, we can conclude that the time taken is 42 hours

Learn more about time:

https://brainly.com/question/13257215

#SPJ1

Sir Isaac Newton was an English Mathematician,physicist,astronomer,theologian and author who is widely recognized as one of the most influential scientist of all time because of his discovery of gravity(force that attracts a body toward center of earth).

Answer:

the 2nd one and the 3rd one

Answer:

1,3,4,5

Explanation:

just got the answer correct on edge

Answer:

c. natural resources

Explanation:

mercantilism is an economic practice by which governments use their economies

if am ryt

Answer:

C. natural resources

Explanation:

Mercantilism is based on the concept of a nation's power being directly related to its wealth. A nation's goal under mercantilism was to obtain as much gold and silver as possible and to export more goods than it imported from other nations. Gold and Silver are natural resources.

Answer:

answer a

Explanation:

while any machine is working, there are some forces (f.e. friction) that are still calculating.

Good luck

(a) The spacing Y of the maxima of the screen for light is  5 x 10^-7 m. (b) Yes, we would expect to observe the interference of light. (c) The slits should be placed a distance of 500 nm apart to observe the maxima separated by 1 mm.

(a) The spacing Y of the maxima on the screen can be calculated using the formula for the interference of light from two slits:

=> Y

= L x λ / d

here L is distance from the slits to the screen,

λ is wavelength of the light,

d is distance between the slits.

Putting the values, we have:

=> Y

= 1 m x 500 nm / 1 cm

= 500 nm/cm

= 5 x 10^-7 m

(b) Yes, we would expect to observe the interference of light on the screen for this situation. This is because when light passes through two narrow slits, it creates an interference pattern on the screen that is a result of the constructive and destructive interference of the light waves. This pattern is characterized by bright and dark bands, with the bright bands representing areas of constructive interference and the dark bands representing areas of destructive interference.

(c) To calculate the distance the slits should be placed to observe the maxima separated by 1 mm, we need to rearrange the formula for Y and solve for d:

=> d

= L x λ / Y

= 1 m x 500 nm / 1 mm

= 500 x 10^-9 m

So, the slits should be placed a distance of 500 nm apart to observe the maxima separated by 1 mm.

To know more about slits please refer: https://brainly.com/question/29842068

#SPJ4

Please find attached photograph for your answer. Please do comment whether it is helpful or not.

Answer:

4 seconds

Explanation:

On the Y axis - you go to 12. Go directly horizontally till you hit the line. Then go directly down. If you do this correctly, you should hit 4 seconds on the X axis.

Answer:

Depending on the amount of liquid nitrogen and the size of the lava flow, the nitrogen will regain it gaseous form well before it contacts the surface of the lava. However, due to the energy cost of bringing the liquid nitrogen back to a gas, it will cool the air above the lava by a few degrees, until that air is reheated by the lava itself.

Explanation:

The liquid nitrogen has enough coldness to completely cool down lava, but also it has the exact same energy to make lava explode.

Answer:

With this amount of liquid nitrogen, more than just the surface lava would start to freeze, and immense pressure would build up underneath. Beneath the mouth of the volcano, there would be kilometers (miles) of lava slowly making its way to the surface. Its natural flow would be stopped by the frozen top layer.

Explanation:

Answer:

LINEARLY CHANGE horizontal displacement

CONSTANT horizontal speed

CONSTATE EQUAL TO ZERO horizontal acceleration

NON-LINEAR vertical displacement is quadratic

LINEARLY CHANGE vertical speed

CONSTATE EQUAL TO g vertical acceleration

Explanation:

The launch of projectiles is analyzed in the form of two independent movements connected by a scalar which is time.

In the vertical part of the movement it is affected by the acceleration of gravity and in the horizontal movement there is no acceleration, neglecting air resistance.

The equations of vertical motion are

          y = y₀ - gt

          y = y₀ +\(v_{oy}\) t - ½ g t²

the equations for horizontal motion are

         vₓ = x / t

now we can answer the questions

LINEARLY CHANGE horizontal displacement

CONSTANT horizontal speed

CONSTATE EQUAL TO ZERO horizontal acceleration

NON-LINEAR vertical displacement is quadratic

LINEARLY CHANGE vertical speed

CONSTATE EQUAL TO g vertical acceleration

In a system using a single movable pulley, the mechanical advantage (MA) is equal to 2. This means that the load being lifted will experience a gain in force of two times the input force applied.

A movable pulley is one that is attached to the load being lifted and is free to move along with it.

When a force is applied to lift the load, the movable pulley changes its position, effectively reducing the force required to lift the load.

The key concept behind the mechanical advantage is that the load is distributed between the input force and the pulley.

In a single movable pulley system, the load is divided between the input force and the pulley itself.

The input force only needs to overcome half of the load's weight since the pulley contributes an equal amount of force in the opposite direction. This results in an MA of 2, indicating a doubling of force.

For example, if a load weighs 100 pounds, an input force of 50 pounds would be sufficient to lift it.

The movable pulley helps distribute the load's weight, reducing the force required by half.

Overall, using a single movable pulley provides a mechanical advantage of 2, allowing the load to be lifted with less force compared to lifting it directly.

for such more questions on force

https://brainly.com/question/12785175

#SPJ8

Answer:

D

Explanation:

descriptive, because scientists are writing down the observations but not making comparisons.  

Percentage of Power Loss = (Power Loss / P1) * 100

= ((v * i) - (w * i)) / (v * i) * 100.

Simplifying this expression gives us the percentage of power lost in transmission from the power plant to the substation.

To calculate the percentage of power lost in transmission from the power plant to the substation, we can use the formula:

Percentage of Power Loss = (Power Loss / Power Produced) * 100.

Power is given by the equation:

Power = Voltage * Current.

Let's denote the power produced at the power plant as P1, and the power received at the substation as P2.

The power produced at the power plant is given by:

P1 = (v * i) kW.

After stepping up the voltage by the transformer, the power at the substation can be calculated as:

P2 = (w * i) kW.

The power loss in transmission can be calculated as :

Power Loss = P1 - P2.

Now, substituting the values:

Power Loss = (v * i) - (w * i) kW.

Finally, we can calculate the percentage of power lost:

Percentage of Power Loss = (Power Loss / P1) * 100

= ((v * i) - (w * i)) / (v * i) * 100.

To know more about power plant, here

brainly.com/question/1474542

#SPJ4

Answer: Robert Wilson and Arno Penzias

Explanation:

electromagnetic

all electromagnetic waves move at the speed of light.

so yes, light waves are electromagnetic waves :)

i hope this helps!

Answer:

D. 3 hours or more

Explanation:

The average 8- to 18-year-old spends at least D. 3 hours every day in front of a screen, performing little to no physical activity. This is because, instead of exercising and socializing with their peers, children and teenagers frequently talk, watch a lot of movies/shows, or play video games on their computers. Unfortunately, this is typically considerably more than three hours every day. Although some children still prefer physical activities over this, the bulk of the population does not.

The force acting on the object will be 32 N.

Newton's second law of motion states that, "the force is equal to the change in momentum per change in the time". The mathematical form of the law is given below.

\(F = \frac{dP}{dt}=\frac{d(mv)}{dt}=m\frac{dv}{dt}=ma\)

Where P = momentum, t = time, m =mass, v = velocity, a = acceleration and F = force.

The mass of the object is 4 kg and acceleration is 8 m/s^2. Substitute the values in the equation and we will get the force.

F = ma

F = 4 kg * 8 m/s^2

F = 32 kg.m/s^2

F = 32 N

To know more about force here:

https://brainly.com/question/13191643

#SPJ1

Answer:

Take a look below

Explanation:

Answer:

Here, the acceleration of shingles is a=g=9.8m/s2, Initial velocity of it is u=0m/s and distance traveled S=8.52mLet t be the required time for the shingles to reach ground. Using formula S=ut+at2/2we get,  8.52=0(t)+0.5(9.8)t2⟹ t=1.32s

The answer is d. all of these. Tree rings provide valuable information about past climates as they grow in response to the environmental conditions of their surroundings.

The thickness of growth rings is affected by factors such as temperature, precipitation, and soil moisture, and can indicate the overall climate conditions during the growing season. The density of growth rings is also influenced by these factors, and can provide information on the severity of drought or other environmental stresses.

Additionally, the presence of frost rings, which are formed when a tree is damaged by frost, can provide evidence of past cold weather events. By analyzing all of these factors together, scientists can gain a comprehensive understanding of past climate conditions, which can inform our understanding of climate change and its potential impacts on the environment.

To Learn more about Tree rings.  Click this!

brainly.com/question/30168483

#SPJ11

As the elevator is moved from 15th floor to the 10th floor at a constant speed. It means that the height is decreasing but the speed of the elevator is moved at a constant.

It results that the kinetic stays the same but the potential energy is decreasing.

8n downwards

since downwards force is greater than upwards just minus

To find the pH of a 0.050 M solution of 2-nitrophenol, we first need to find the concentration of H+ ions in solution. We can do this using the acid dissociation constant (Ka) of 2-nitrophenol and the equilibrium reaction:

2-nitrophenol + H2O ⇌ H+ + 2-nitrophenolate-

Ka = [H+][2-nitrophenolate-] / [2-nitrophenol]

We can assume that the initial concentration of H+ ions is zero, and the initial concentration of 2-nitrophenol is 0.050 M. We also know that the concentration of 2-nitrophenolate- at equilibrium will be equal to the concentration of H+ ions, since the acid dissociates to form one H+ ion and one 2-nitrophenolate- ion.

Let x be the concentration of H+ ions at equilibrium. Then we can write:

\(Ka = x^2 / (0.050 - x)\)

Simplifying, we get:

\(x^2 = Ka * (0.050 - x)\\x^2 + Ka * x - Ka * 0.050 = 0\)

Using the quadratic formula, we get:

\(x = (-Ka ± sqrt(Ka^2 + 4Ka0.050)) / 2\)

Taking the positive root and plugging in Ka = \(6.3 x 10^-8\), we get:

\(x = 3.98 x 10^-4 M\)

Therefore, the concentration of H+ ions in solution is \(x = 3.98 x 10^-4 M\) M. To find the pH, we can use the equation:

pH = -log[H+]

Plugging in the value for [H+], we get:

\(pH = -log(3.98 x 10^-4) ≈ 3.40\)

Therefore, the pH of a 0.050 M solution of 2-nitrophenol is approximately 3.40.

To know more about speed here

https://brainly.com/question/13943409

#SPJ4

The scientific theory cannot be accepted immediately, because there is always the possibility of discovering new information or modification.

A scientific theory is an explanation of the natural world and universe that has been repeatedly tested in accordance with the scientific method. Theories are tested under controlled conditions in an experiment and are evaluated through principles of abductive reasoning.

A scientific theory differs from scientific law in that a theory explains how or why is a basic observation, whereas a law is a statement about a relationship between facts. Newton’s Law of Gravity is a mathematical equation that can be used to find the attraction between objects, but it is not a theory to describe how gravity works.

If experimental results contrary to predictions of the theory are observed, scientists evaluate whether the experimental design was good and confirm the results by independent replication.

Solutions may need some changes to the theory, or none at all, and after the successive modifications, theories consistently improve and greater accuracy is achieved.

Learn more about scientific theory, here:

https://brainly.com/question/2375277

#SPJ1