can someone help me with these two 2 question 3 and 4 please

Answer:

The acceleration of an object can be calculated using Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. The equation is:

F = ma

where F is the force, m is the mass, and a is the acceleration.

So, if we know the mass of the object (m = 56 kg) and the force acting on it (F = 800 N), we can calculate the acceleration (a) by dividing the force by the mass:

a = F / m

a = 800 N / 56 kg

a = 14.28 m/s^2

So the acceleration is 14.28 m/s^2

Answer:

8.22m

Explanation:

As interpreted from this problem, the angle of launch is 90 degrees as it is thrown straight up. Given an angle launch of 90°, upward initial velocity of 12.7m/s, and initial height of 0m. A much simpler equation can be used to find the maximum height.

\(h_{max} = h_ {0} + \frac{{v_0}^{2} }{2g}\)

this means that the max height is equal to the initial height plus the initial velocity squared divided by 2 times the acceleration of earth's gravity(≈9.8m/s^2 or 10m/s^2 depending on how you fix it).

when substituted into the equation, you should get.

(9.8m/s^2)

hmax = 0 + ((12.7)^2)/(2*9.8)

hmax = 161.29/19.6 ≈ 8.22

hmax = 8.22m

If the acceleration of gravity is 9.81 m / s², then the speed of the cat when it slid off the table would be 3.61 m /s.

There are three equations of motion given by  Newton,

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

As given in the problem if a stuntwoman jumps from a height of 98.5 m into an airbag below. If she struck the airbag at a speed of 40 m/s including the effects of air resistance,

By using the second equation of the motion,

S = ut + 1/2 × a × t²

1.1 = 0 + 0.5 × 9.8 × t²

t² = 1.1 / 4.9

t = 0.47  s

The speed of the cat =  1.7 / 0.47

                                   = 3.61 m /s

Thus, the speed of the cat when it slid off the table would be 3.61 m /s.

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Answer:

If this is your question... the answer is C.

Explanation:

For edge:)

Answer:

C on edge2021

Answer: 1.Magnification and resolution are important because the magnification in larges the image and the resolution makes it move shape and detailed creating the perfect image.  2. i dont know the second one, sorry

Explanation:

The maximum height reached by the brick above the ground is 20 ft. The time taken by the brick to reach the ground is 0 seconds. Free-fall motion (uniformly accelerated motion) after falling from a height of 20 feet. Further, the acceleration experienced by the free brick is equal to the acceleration due to gravity which is approximately 32ft/sec², downward.

Hence, we can write its acceleration as, a = g = 32ft/sec².

Here, u = 0 as the brick was not moving initially while it was at rest on the top of the load of bricks.

Now, the value of v(t) can be obtained by integrating the above expression w.r.t. time as shown below:v(t) = u + a.t = 0 + 32t = 32t ...(1)

The value of x(t) can be obtained by integrating the expression for v(t) w.r.t. time, i.e. t as shown below :x(t) = (1/2).a.t² + u.t + x₀ = (1/2).32t² + 0 + 20ft = 16t² + 20ft ...(2)

Here, x₀ = 20ft is the initial displacement of the brick above the ground.

Now, we can answer the questions as follows:

(a) Using  the following relation: v = u + a.t = 0 when the brick is at its highest point.

Hence, the time taken to reach this point can be obtained as follows:0 = u + a.t ⇒ t = (-u/a) = (0/32) sec = 0 secThis means that the brick reaches its maximum height at t = 0 sec, which is the initial moment.

Thus, the maximum height reached by the brick above the ground is, x(0) = 16.0² + 20 = 20 ft

(b) The time taken by the brick to reach the ground can be obtained by using the following relation: x(t) = 0.

Here, we are interested in finding the value of t.

Hence, we can substitute x(t) from equation (2) above and equate it to 0 to obtain the value of t as shown below:16t² + 20 = 0 ⇒ t² = -(20/16) sec².

This means that the brick doesn't take any finite time to reach the ground from its maximum height.

This is because it falls vertically downwards from a height of 20 ft under the action of gravity.

Thus, it reaches the ground at t = 0 sec only.

(c) The speed of the brick just before it hits the ground can be obtained by using the expression for v(t) from equation (1) above and substituting t = 0 sec (just before it hits the ground) as shown below:

v(0) = 32(0) = 0 ft/sec.

Hence, the speed of the brick just before it hits the ground is 0 ft/sec.

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We know that substances expand with high temperatures and contract with low temperatures, therefore, the bridge will contract and the answer is b.

Answer:

4 meters per second

Explanation:

R = d/t

If a ball takes 10 seconds to roll 40 meters, then the average speed of the ball would be 4 meters / seconds .

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem we have to find the average speed of the ball if the ball takes 10 seconds to roll 40 meters,

The total distance moved by the ball = 40 meters

The time taken by the ball to roll = 10 seconds

The average speed of the ball = 40 / 10

                                                   = 4 meters / second

Thus, the average speed of the ball would be  4 meters / second.

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The SI unit of force is newton N.

What is force?

The definition of force is being explained by the Newtons Second law of Motion. This law states that the force is equal to the change in momentum per change in time. When we have to calculate the force for a constant mass, it is equal to the product of mass and acceleration i.e., F= ma

There are total seven fundamental units in physics.

Force = mass x acceleration

Force = kilogram x meter/ second 2

So, the unit of force derived from fundamental units are kg m/s2 and newton N is the unit in international system of units.

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Answer:

uhh

Explanation:

A skier leaves the horizontal end of a ramp with a velocity of 20m/s and takes 3.5 seconds to land to the m from the edge of the ramp ground.  The  height of the ramp is 60 m he lands 60 m from the edge of the ramp.

Ramp is defined as an assist for raising or lowering a load that consists of a flat supporting surface tilted at an angle from the vertical direction with one end higher than the other.

The time taken to reach is

v = d / t

d = v x t

d = 20 x 3.5

d = 70 m.

The height can be calculated as

Height = 9.8 x ( 3.5 )² / 2

Height = 9.8 x 12.3 / 2

Height = 120.54 / 2

Height = 60.3 ≅ 60 m

Thus, a skier leaves the horizontal end of a ramp with a velocity of 20m/s and takes 3.5 seconds to land to the m from the edge of the ramp ground.  The  height of the ramp is 60 m he lands 60 m from the edge of the ramp.

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the International System of Units, the fundamental units are: The meter (symbol: m), used to measure length. The kilogram (symbol: kg), used to measure mass. The second (symbol: s), used to measure time. The ampere (symbol: A), used to measure electric current.

The term that can be used to describe the change of energy from one form to another is called energy conversion, energy transformation.

In the field of science, energy conversion or energy transformation are the phrases that are used to express that energy can be converted from one form to another in a system.

It is due to energy conversion or energy transformation that various processes of life can occur. For example, the energy stored in food can be changed into various forms such as heat energy in order to do work.

All the processes that occur in living systems are dependent on energy conversion and energy transformation.

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Answer:

–2.5 m/s²

Explanation:

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

Initial velocity (u) = 25 m/s

Final velocity (v) = 0 m/s

Time (t) = 10 s

Acceleration (a) =?

Acceleration can simply be defined as the rate of change of velocity with time. Mathematically, it can be expressed as:

a = (v – u) /t

Where:

a => is the acceleration

v => is the final velocity

u => is the initial velocity

t => is the time.

With the above formula, we can obtain the acceleration of the car as follow:

Initial velocity (u) = 25 m/s

Final velocity (v) = 0 m/s

Time (t) = 10 s

Acceleration (a) =?

a = (v – u) /t

a = (0 – 25) /10

a = –25 / 10

a = –2.5 m/s²

The acceleration of the car is –2.5 m/s². The negative sign indicate that the car is decelerating i.e coming to rest.

The number of valence electrons in neutral atoms equals the atom's main group number. A periodic table column can be used to determine an element's main group number.

The position-time graph depicts the movement of an item across time. Time in seconds is traditionally represented on the x-axis, while object location in metres is plotted along the y-axis. The slope of the position-time graph offers vital information about the object's velocity.

Gravity causes objects in free fall to accelerate. As a result, the free fall motion position-time graph must be curved. This means that objects in free fall begin with a moderate velocity and gradually accelerate, as illustrated by the graph's steep downward curve.

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fusion is when solid changes it's state to liquid

and vaporization is when liquid changes it's state to gas

so the difference between fusion and vaporization is the state

Answer:

vf = 32ms

Explanation:

v  =  u  +  a t ,

v  =  0  +  8.0  x  4.0  

v  =  32 ,

v  =  32 m /s  

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13.The color with the longest wavelength is option A. Red.

14.The sky appears blue due to option D. Scattering of light.

Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.

The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.

The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day.  The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.

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In the cubic systems, the (10) plane and the (10) plane (plane and its negative) are Identical

The cubic crystal system also referred to as a cubic system, is a type of crystal in crystallography where the unit cell (crystal lattice) is shaped like a cube. One of the most frequent and straightforward shapes seen in crystals and minerals is this one. Upon thorough examination of the geometric arrangement of atoms in the crystal lattice, all the properties of the element can be known

A plane is a flat, endlessly long two-dimensional surface. A plane is a two-dimensional model that can include three-dimensional space, a line, and a point.

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Answer:

Electromagnetic waves strike a semiconductor, removing some of

its electrons, which form a current.

Answer:Electromagnetic waves strike a semiconductor, removing some of its electrons, which form a current.

Explanation:

Given :

Mass of object, m = 1.5 kg.

To Find :

The momentum of boulder dropped from a cliff after 3 seconds.

Solution :

Speed of boulder after 3 seconds of free fall is given by :

v = u + gt       ( Equation of motion )

v = 0 + 10×3    ( g = acceleration due to gravity )

v = 30 m/s

Now, momentum is given by :

P = m × v

P = 1.5 kg × 30 m/s

P = 45 kg m/s

Therefore, momentum of boulder is 45 kg m/s.

Plant cells are different from animal cells in the sense that only plant cells can perform photosynthesis (option D).

Photosynthesis is a biological process by which green plants manufacture their own food (sugar) using energy from sunlight.

In other terms, it can be said that photosynthesis is any process by which plants and other photoautotrophs convert light energy into chemical energy.

Animal cells are rather heterotrophic, meaning that they cannot synthesize their own food like plants do.

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Answer:

The Earth's rotation which produces Coriolis force is the responsing factor for the formation and movement of different global winds.

The cause of the global winds is due to the rotation of the earth that produces the Coriolis force factor for the formation and movement of global winds.

The global wind pattern is formed by the movement of the earth and they are polar easterlies, prevailing westerlies and the trade winds.

Each of them occurs at about 30 degrees of latitude. Hence they form wind belts. The Coriolis effect that is created due to the rotation of the earth is a fact that leads to the movement of global winds.

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Answer:

Explanation:

The mass of the car doesn't matter because On a flat curve the mass of the car does not affect the speed at which it can stay on the curve. You would need the mass if you were solving the the centripetal force acting on the car, but not the acceleration.

\(a=\frac{v^2}{r}\) and filling in

\(a=\frac{(8.5)^2}{48.0}\) and we need 2 significant digits in our answer. That means that

a = 1.5 m/sec²

The number of turns in the solenoid is 10.08 x 10⁴.

Length of the solenoid, L = 0.5 m

Magnetic field, B = 9 T

Current flowing through the solenoid, I = 75 A

The magnetic field due to a current carrying solenoid,

B = μ₀NI/L

Therefore, the number of turns,

N = BL/μ₀I

N = (9 x 0.5)/(4\(\pi\) x 10⁻⁷x 75)

N = 10.08 x 10⁴

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Answer:

490N

Explanation:

W=m×g

W=50×9.8=490N

To calculate the book value at year 3 (BV3), we need to determine the accumulated depreciation at year 3. The depreciation is calculated by subtracting the salvage value from the initial cost and dividing it by the number of years.

Initial cost: $20,000

Salvage value: $5,000

Number of years: 5

Depreciation per year = (Initial cost - Salvage value) / Number of years

Depreciation per year = ($20,000 - $5,000) / 5 = $3,000

Accumulated depreciation at year 3 = Depreciation per year * Number of years

Accumulated depreciation at year 3 = $3,000 * 3 = $9,000

Book value at year 3 = Initial cost - Accumulated depreciation at year 3

Book value at year 3 = $20,000 - $9,000 = $11,000

Therefore, the Book Value at year 3 (BV3) is $11,000 (option d).

To calculate the depreciation at year 3 (D3), we can simply use the depreciation per year, which is $3,000. Therefore, the Depreciation at year 3 (D3) is $3,000 (option b).

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