What conclusions can you make if a hockey goalie fails to block pucks shot in the upper right hand corner of the net

In the above diagram, the net force is 10 Newtons to the right, with an acceleration of 5 m/s².

The net force acting on an object is the sum or resultant force on the object. The net force acting on the given object is obtained by summing all the forces acting on the object in the same direction.

The upward force on the object = 7 N. The downward force on the object = 17 N. The net force on the object:

= 17 N - 7 N

= 10 N.

The acceleration of the object is calculated by applying Newton's second law of motion as follows;

F(net) = ma

where;

m is the mass of the object = 2 kg

a is the acceleration of the object = ?

F(net) is the net force on the object

a = F(net) / ma

= (10 N) / (2 kg)a

= 5 m/s²

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Answer:

1. 160

2. 0

3. 120

Explanation:

Answer:

v = 14.92 m/s

Explanation:

First, make a free body diagram and see the forces in the y-direction.

Use Newton's 2nd Law F = ma to replace ∑F_y with m * a_y.

The acceleration in the y-direction is the centripetal acceleration, a_c = v^2/r.

The normal force is 0 because this is where the rollercoaster is not falling off the track yet not touching the track.

The masses cancel out.

Solve for v to find the speed of the rollercoaster at the top of the loop.

The minimum speed the coaster must have at the top of the loop to not fall off the track is 14.92 m/s.

For a human jumper to reach a height of 110 cm, the person will need to leave the ground at a speed of 4.65 m/s.  

We can calculate the initial speed to reach 110 cm of height with the following equation:

\( v_{f}^{2} = v_{i}^{2} - 2gh \)

Where:

\( v_{f}\): is the final speed = 0 (at the maximum height of 110 cm)

\( v_{i}\): is the initial speed =?

g: is the acceleration due to gravity = 9.81 m/s²

h: is the height = 110 cm = 1.10 m

Hence, the initial velocity is:

\( v_{i} = \sqrt{v_{f}^{2} + 2gh} = \sqrt{2*9.81 m/s^{2}*1.10 m} = 4.65 m/s \)

Therefore, the initial speed that the person must have to reach 110 cm is 4.65 m/s.

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The threshold photon energy for DNA damage is 10 electron volts (eV).

What is DNA?

DNA is a nucleic acid that stores genetic information. Living things serve as the blueprint for the development, functioning, and reproduction of living things. It is made up of two strands that spiral around each other, forming a double helix.

How is DNA damaged?

DNA damage is caused by a variety of factors, including radiation, chemicals, and toxins. DNA damage can have severe consequences, ranging from minor mutations to severe cell death. The energy from the radiation, for example, photons, can break chemical bonds in DNA, resulting in DNA damage.

What is the threshold photon energy?

The threshold photon energy is the smallest amount of energy required for the radiation to cause DNA damage. According to research, the threshold photon energy for DNA damage is 10 electron volts (eV). That is the smallest amount of energy that can cause DNA damage.

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Answer:

Atomic particle.

Explanation:

It is used to calculate mass at atom level .

1 amu is the mass of 1 atom of C12 carbon

The statement "shear stress is often assumed to be constant across the width of a beam's cross section at any specific, y, position" is false.

It is uncommon to assume a constant shear stress across the entire width of a beam's cross-section at a given position, as shear stress typically exhibits non-uniformity throughout the width.

In fact, the shear stress distribution across a beam's cross-section generally varies due to the influence of the cross-sectional shape and the applied load conditions.

In practice, the shear stress experienced by a beam is subject to variability across its width, rather than being consistently constant. The distribution of shear stress is contingent upon factors such as the geometry of the cross-section and the specific loading conditions imposed upon the beam.

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Answer:

69.42 m

Explanation:

From the question given above, the following data were obtained:

Initial velocity (vᵢ ) = 4.9 m/s

Acceleration (a) = 4.2 m/s²

Time (t) = 4.7 s

Displacement (Δx) =?

Thus, we can obtain the displacement by using the following formula:

Δx = vᵢt + ½at²

Δx = (4.9 × 4.7) + (½ × 4.2 × 4.7²)

Δx = 23.03 + (2.1 × 22.09)

Δx = 23.03 + 46.389

Δx = 69.419 ≈ 69.42 m

Thus, the distance travelled is 69.42 m

Answer:

b. O and Cl

Explanation:

Answer:

Mercury

Explanation:

The magnification of the image formed by the lens is -0.982.

To determine the magnification of the image formed by the lens, we can use the lens formula:

1/f = (n - 1) * (1/r1 - 1/r2)

Where f is the focal length of the lens, n is the refractive index of the lens material, r1 is the radius of curvature of the front surface, and r2 is the radius of curvature of the back surface.

Given that the radii of curvature are 34.5 cm and -26.9 cm, and the refractive index is 1.66, we can substitute these values into the lens formula to calculate the focal length.

Using the lens formula, we find that the focal length of the lens is approximately 13.54 cm.

The magnification of the image formed by the lens can be determined using the magnification formula:

m = -v/u

Where m is the magnification, v is the image distance, and u is the object distance.

Given that the object is placed 42.6 cm from the lens, we can substitute this value and the focal length into the magnification formula to calculate the magnification.

Substituting the values, we find that the magnification of the image formed by the lens is approximately -0.982.

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the barriers if the interval are Aand B the of displacement goes up.

from B to C it just stays the same, then from C to D no Movement, and from time D to E movement, but steady

An atom is the smallest unit of matter that forms a chemical element. An atom is made up of three kinds of subatomic particles: electrons, protons, and neutrons.A molecule is a combination of atoms bonded together through a covalent bond. Generally, we think of molecules as having no charge (although molecular ions do exist)

ANSWER:

a) 5 V

b) 8.33 A

c) step-up transformer

STEP-BY-STEP EXPLANATION:

a)

To calculate the input voltage it would be:

b)

To calculate the output current it would be:

c)

We have to:

Step-up transformer increase the output voltage.

Step-down transformer reduces the output voltage.

In this case, the voltage goes from being 5 V to being 12 V, therefore the output voltage increases, which means that it would be a step-up transformer.

The component form of vector u is approximately u = (16.77, 24.87)

To find the component form of vector u, we are given its magnitude and the angle it makes with the positive x-axis. Let's denote the angle as θ.

Given:

Magnitude of u: 30

Angle with positive x-axis: θ = 56 degrees

To find the component form, we need to determine the x-component (u_x) and the y-component (u_y) of the vector.

The x-component can be calculated as:

u_x = u * cos(θ)

The y-component can be calculated as:

u_y = u * sin(θ)

Substituting the given values:

u_x = 30 * cos(56 degrees)

u_y = 30 * sin(56 degrees)

Using a calculator or trigonometric table, we can evaluate the trigonometric functions:

u_x ≈ 30 * 0.559 = 16.77 (rounded to two decimal places)

u_y ≈ 30 * 0.829 = 24.87 (rounded to two decimal places)

Therefore, the component form of vector u is approximately u = (16.77, 24.87)

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The efficiency of a certain engine can be determined using the Carnot Cycle equation. The efficiency of an engine is proportional to the difference in temperature between the hot reservoir and the cold reservoir.

The efficiency can be calculated using the following formula:

η = (Th - Tc) / ThWhere,η = efficiency of the engine

Th = temperature of the hot reservoir

Tc = temperature of the cold reservoir

Given that the temperature of the hot reservoir is 700°C and the temperature of the cold reservoir is 230°C.

Therefore,η = (700 - 230) / 700η = 0.67The efficiency of the engine is 0.67 or 67%. In other words, only 67% of the heat energy is converted into mechanical energy while the remaining 33% is lost as waste heat.

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Answer:

Colour of any object is by the colour of light it reflects i.e if white light is incident on the object,it will reflect blue color.so it will appear blue.But if red light is incident on it,it will not reflect that and absorb it.so as it will not reflect any light it will appear black.

Explanation:

The orbital period for Exoplanet A is estimated to be 18.4 days based on the time between two transit events observed on the graph. This calculation assumes a regular and consistent orbital pattern, but the actual period may vary slightly due to factors like orbital eccentricity.

The first transit event occurs at day 10.5 on the graph. The second transit event occurs at day 28.9 on the graph. The time between these two events is 28.9 - 10.5 = 18.4 days.

It is important to note that this is just an estimate of the orbital period. The actual orbital period may be slightly different due to factors such as the eccentricity of the orbit.

Here are the steps I took to calculate the orbital period:

The orbital period for Exoplanet A is 18.4 days.

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Answer:

-100N

Explanation:

Newton's third law of motion states that to every force exerted on one body, there is an equal and opposite force. This means that if object A exerts an ACTION force on B, there is a force called REACTION FORCE, which is equal and opposite, exerted on A by B.

The action and reaction forces are equal in size/magnitude but opposite in direction. In this case where a tennis racket strikes a tennis ball with a force (action force) of 100N, the ball will strike the racket with a reaction force of -100N.

F(RB) = -F(BR)

A 20.0 kg cannonball is fired from a cannon with a muzzle speed of 100 m/s at an angle of 20.0°. Using conservation of energy, the maximum height reached by the cannonball is approximately 510.2 meters.

A cannon ball weighing 20.0 kg is launched from a cannon with an initial velocity of 100 m/s at an angle of 20.0° above the horizontal.

To determine the maximum height reached by the cannonball using the conservation of energy principle, we consider the conversion of kinetic energy into gravitational potential energy.

Initially, the cannonball has only kinetic energy, given by the equation KE = (1/2)mv², where m is the mass and v is the velocity.

At the highest point of its trajectory, the cannonball has no vertical velocity, meaning it has no kinetic energy but possesses gravitational potential energy, given by the equation PE = mgh, where h is the height and g is the acceleration due to gravity (approximately 9.8 m/s²).

Using the conservation of energy, we equate the initial kinetic energy to the maximum potential energy:

(1/2)mv² = mgh

Canceling the mass and rearranging the equation, we find:

v²/2g = h

Plugging in the given values, we have:

(100²)/(2*9.8) = h

Simplifying the equation, we find:

h ≈ 510.2 m

Therefore, the maximum height reached by the cannonball is approximately 510.2 meters.

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Explanation:

Pressure due to the weight of a liquid of constant density is given by p=ρgh p = ρ g h , where p is the pressure, h is the depth of the liquid, ρ is the density of the liquid, and g is the acceleration due to gravity

Answer:Pressure due to the weight of a liquid of constant density is given by p=ρgh p = ρ g h , where p is the pressure, h is the depth of the liquid, ρ is the density of the liquid, and g is the acceleration due to gravity.

Explanation:

Answer: 60 times brighter

The efficiency of the car can be calculated as the ratio of the kinetic energy gained by the car to the energy released by the gasoline.

The kinetic energy gained by the car can be calculated as KE = 1/2mv^2, where m is the mass of the car and v is its final velocity. Substituting the given values, we get KE = 1/2 x 770 kg x (25 m/s)^2 = 240,625 J.

The energy released by the gasoline can be calculated as E = (0.0766 L) x (3.2 x 10^7 J/L) = 2.4512 x 10^6 J.

The efficiency of the car is then given by the ratio of the kinetic energy gained by the car to the energy released by the gasoline, which is 240,625 J / 2.4512 x 10^6 J = 0.098 or 9.8%. Therefore, the efficiency of the car is approximately 9.8%

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Answer:

6.19*10^-3 J

Explanation:

Just took the test. Kiss me

Answer:

Explanation:

Light gets reflected by a medium of higher  refractive index and then from a medium of lower refractive index a second time  so there will  be an additional phase difference of 180⁰.

For constructive interference in thin films  the condition is as follows .

2μd = (2n+1) λ/2

where μ is 1.56 , d is 80 nm λ is wave length of ligh and n is an integer .

For longest wavelength , n = 0

λ = 4μd

= 4 x 1.56 x 80 nm

= 499.2  nm .

To determine the capacitance and the maximum voltage that can be applied to a Teflon-filled parallel plate capacitor, we can use the formula for capacitance:

(a) The capacitance of a parallel plate capacitor is given by the formula:

C = (ε₀ * εᵣ * A) / d,

where C is the capacitance, ε₀ is the vacuum permittivity (8.854 x 10^-12 F/m), εᵣ is the relative permittivity (dielectric constant) of Teflon (approximately 2.1), A is the plate area, and d is the distance (insulation thickness) between the plates.

First, we need to convert the plate area from square centimeters to square meters:

A = 175 cm² = 175 x 10^-4 m²

Now we can calculate the capacitance:

C = (8.854 x 10^-12 F/m * 2.1 * 175 x 10^-4 m²) / (0.0400 x 10^-3 m)

= 7.73 x 10^-11 F

Therefore, the capacitance of the Teflon-filled parallel plate capacitor is approximately 7.73 x 10^-11 Farads.

(b) The maximum voltage that can be applied to a capacitor depends on its breakdown voltage, which is the voltage at which the dielectric material (in this case, Teflon) begins to break down and conduct electricity. Teflon has a high breakdown voltage, typically around 20,000 to 50,000 volts per millimeter.

To calculate the maximum voltage, we need to convert the insulation thickness from millimeters to meters:

d = 0.0400 mm = 0.0400 x 10^-3 m

The maximum voltage can be estimated by multiplying the breakdown voltage per unit thickness by the total thickness:

Maximum voltage = (Breakdown voltage/mm) * d

Taking a conservative estimate of the breakdown voltage at 20,000 volts per millimeter:

Maximum voltage = (20,000 V/mm) * 0.0400 x 10^-3 m

= 800 V

Therefore, the maximum voltage that can be applied to the Teflon-filled parallel plate capacitor is approximately 800 volts.

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Answer:

C

Explanation:

Earth Mars Jupiter Saturn,Uranus, naptune

Answer:

10km/h describe its velocity

Explanation:

Velocity =distance /time

It defined as the rate of change of the object's position with respect to a frame of reference and time.

If you travel a distance of 10 Km in 1 hour then 10 km/h is your velocity.

Velocity can be explained as a vector measurement of the direction and rate of motion of an object. The velocity of an object can be specified as the rate of change in the object’s position w.r.t. time.

Velocity can be defined as a vector parameter as it consists of both magnitude and direction. The velocity can be determined from the formula mentioned below:

v = d / t

where v is the velocity, d represents the distance covered, and t is the time.

Although the S.I. unit for the measurement of velocity is m/s or, miles per hour (mph), and kilometers per hour (kph).

Given, the distance traveled, d = 10  km

The time is taken, t = 1 hr

The velocity, v = d/t = 10 km/1 h = 10 km/h

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Answer:

In my mind when I hear the word momentum it comes that it is the product of mass and velocity.

The word momentum means mass and velocity taken together.

Mass is an intrinsic basic physical quantity which tells us about the amount of matter contained in a body. It is a scalar quantity and it is measured in kilogram(Kg).

Velocity is the rate of change of displacement . It is defined as displacement per unit time. It is a vector quantity and measured in meter per second (m/s)

The product of mass and velocity is momentum. When a body possesses both mass and velocity we say that it has momentum. It is a vector quantity. Its unit is kg m/s

Mathematically we write momentum as,

P = mv

Mathematically we write momentum a

Where, P = momentum

m = mass

v= velocity.

When a force is applied on a body, it changes its momentum. The relationship between force and momentum is given by Newton's second law of motion which states that the rate of change of momentum is directly proportional to the force applied,

F = Δp /Δt

Where F= force

Δp = change in momentum

Δt = time taken for the change in momentum to occur.

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One statement that is not true is that UV radiation is a type of electromagnetic radiation. It is also a type of ionizing radiation. UV radiation is actually a form of non-ionizing radiation.

UV radiation, or ultraviolet radiation, is a type of electromagnetic radiation that falls between visible light and X-rays on the electromagnetic spectrum. It is often categorized into three types: UVA, UVB, and UVC. Unlike ionizing radiation, such as X-rays and gamma rays, which have enough energy to remove tightly bound electrons from atoms or molecules, UV radiation lacks the necessary energy to ionize atoms or molecules. Instead, it primarily interacts with the outermost electrons of atoms or molecules, leading to chemical reactions and causing biological effects.

UV radiation is commonly associated with sunlight and has various effects on living organisms and materials. It can cause sunburn, premature aging of the skin, and an increased risk of skin cancer. Exposure to excessive UV radiation can also damage the eyes and impair the immune system. It is important to protect oneself from excessive UV exposure by wearing sunscreen, protective clothing, and sunglasses.

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