how much work is done when you push a crate horizontally with 130 N across a 5.0-m

Answer:

could someone at least give one answer instead of a choice between two cause that is a 50/50 chance to get it correct on a test!!

Explanation:

when heat energy is added to a system, change in system can be:

Mass of the dummy m = 75 kg

Net Force on the dummy [tex]F_{net}  = -825 N[/tex] since it is given that the force is towards the backside of the car.

Acceleration of the dummy a = ?

Using Newton's 2nd law of motion, we have

[tex]F_{net}  = ma[/tex]

-825 = (75)a

Hence, [tex]a =  \frac{-825}{75}[/tex]

Acceleration of the dummy is -11 [tex]m/s^{2}[/tex]

The negative sign indicates that the dummy is slowing at a rate of 11 [tex]m/s^{2}[/tex]

Answer:

        Acceleration towards rear = 11 [tex]m/s^2[/tex]

        Acceleration towards direction of movement of dummy  = -11 [tex]m/s^2[/tex]

Explanation:

  Mass of dummy = 75 kg

   Force acted towards rear of the car = 825 N

   We have Force acting on a body = Mass of body * Acceleration of body

   Substituting the given values in the above equation we will get

        825  = 75 * a

         a = 11 [tex]m/s^2[/tex]

        So acceleration towards rear = 11 [tex]m/s^2[/tex]

        Acceleration towards direction of movement of dummy  = -11 [tex]m/s^2[/tex]

Hello  Undeadman12

All objects in motion would have kinetic energy

:)

Hi there.

Your Question: All objects in motion have what energy ?

Kinetic Energy is the answer,  (I took this part from google) Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position).

I hope this helps, if it does, please consider marking me brainiest! <3

Answer:

Bohr atomic model

Explanation:

Bohr's atomic model:

Bohr's atomic model was proposed by Neil Bohr in 1913. In this atomic model  Neil Bohr's modified the Rutherford Model and show how electrons in an atoms moves around the nucleus in stable orbits. According to Rutherford model electron's in atoms are filled in orbits and these electron moves around the nucleus in these orbits like planets moves around the sun in fixed orbit but Rutherford's model was unable to show the stability of orbits. To solve this problem, Bohr proposed a new model b. According to this model electrons move around the nucleus in fixed size orbits which have fixed energy and the electron with low energy is filled in smaller size orbit. Radiation are emitted from atoms only when transition of electron from higher energy orbit to lower energy orbit takes place.

Bohr’s model showed that electron orbits had distinct radii.

Answer:

bohr developed a model of the atom that predicts how it will behave

Explanation:  

a p e x :)

AS

work done =W = F.d = F d cosФ     (Ф is angle between force F and displacement d) If a body/object is moving on a smooth surface (friction-less surface ) .There is no force acting on that body.  F=0 so W=FdcosФ= (0)dcosФ ⇒ W=0

Now if a body is facing some amount of force but under the action of force there is no displacement covered. d=0 so W =FdcosФ= F(0)cosФ ⇒W=0

example:  A person is applying a force on rigid wall but wall remains at rest there is no displacement occurs in wall.

The third term upon which work done  dependent is angle between force and displacement i.e Ф. If Ф=90° then W= FdcosФ= Fdcos90⇒ W=0   ( as cos 90°=0)

Answer: need more info

Explanation:

The planet stay in orbit due to gravity. because the gravity of the sun  keeps  the planets in their orbits,

Answer:

1) time t = 9 s

2) velocity v  = 26.4 m/s 2.17° east of north

Explanation:

1

Given

velocity of sea lion [tex]v_s = 40.0 kmph[/tex]

velocity of the fish [tex]v-f = 16 kmph[/tex]

Distance  between the fish and sea lion d = 60 m

Solution

Relative velocity of the sea lion with respect to the fish

[tex]v = v_s - v_f\\\\v = 40 - 16\\\\v = 24.kmph\\\\v = 24 \times \frac{1000}{60 \times 60}  m/s\\\\v = 6.67 m/s[/tex]

Time

[tex]t = \frac{d}{v} \\\\t = \frac{60}{6.67} \\\\t = 9 s[/tex]

2

Given

velocity of the truck [tex]v_t = 25 m/s[/tex]

velocity of the dog [tex]v_d = 1.75 m/s[/tex]

Angle [tex]\theta = 35.0^o[/tex]

Solution

Dog moves in north east so

Component of velocity in East

[tex]v_{d,E} = v_dsin\theta\\\\v_{d,E} = 1.75 \times sin35\\\\v_{d,E} = 1.004 m/s[/tex]

Component of velocity in North

[tex]v_{d,N} = v_dcos\theta\\\\v_{d,N} = 1.75 \times cos35\\\\v_{d,N} = 1.434 m/s[/tex]

The velocity of Dog relative to the road = velocity of the dog relative to truck + velocity of the truck relative to the road

Y component

[tex]v_y = v_t + v_{d,N}\\\\v_y = 25 + 1.434\\\\v_y = 26.434 m/s[/tex]

X component

[tex]v_x = v_{d,E}\\\\V_x = 1.004 m/s[/tex]

Velocity

[tex]v = \sqrt{v_x^{2} +v_y^{2} } \\\\v = \sqrt{1.004^2 + 26.434^2} \\\\v = 26.4 m/s[/tex]

Direction

[tex]\phi = tan^{-1}\frac{v_x}{v_y} \\\\\phi = tan^{-1}\frac{1.004}{26.434} \\\\\phi = 2.17^o east of north[/tex]

For the time and velocity:

The sea lion will catch the fish in 0.42 seconds.

The velocity of the dog relative to the road is 26.41 m/s north.

Question 1: Formula:

Relative velocity = vA - vB

The sea lion is moving at a relative velocity of 40.0 - 16.0 = 24.0 km/h faster than the fish.

The distance between the sea lion and the fish is 60.0 m, which is 0.160 km.

The time it takes the sea lion to catch the fish is:

time = distance / relative velocity

= 0.160 km / 24.0 km/h

= 0.007 h

= 0.42 seconds

Therefore, it would take the sea lion 0.42 seconds to catch the fish.

Question 2: Formula:

Relative velocity = vA + vB

The velocity of the dog relative to the road can be found by adding the velocity of the truck and the velocity of the dog.

The velocity of the truck is 25.0 m/s north.

The velocity of the dog can be broken down into two components: a northward component of 1.75 × cos(35.0°) = 1.41 m/s and an eastward component of 1.75 × sin(35.0°) = 1.18 m/s.

Therefore, the velocity of the dog relative to the road is 25.0 + 1.41 = 26.41 m/s north.

The direction of the velocity of the dog relative to the road is north.

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Newton's 2nd law of motion:

F = ma

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

If they're dropped from the same height at the same time and there's no air resistance, the the lighter ball and the heavier ball, as well as a feather, a hammer, a bowling ball, a speck of dust, a school bus, and a battle ship, will all fall side-by-side and hit the ground at the same time.  

We've known this for about 400 years, since Galileo.  And we've known WHY for about 300 years, since Newton.

Answer:

Third displacement = 2.81 m which is 61.70° north of east.

Explanation:

   Let east represents positive x- axis and north represent positive y - axis. Horizontal component is i and vertical component is j.

  She sails 2 km east, displacement = 2 i

  Then 3.50 km southeast, means 3.5 km 315⁰ to + ve X axis

  Displacement = 3.5 cos 315 i + 3.5 sin 315 = 2.47 i - 2.47 j

  Let third displacement be x i + y j

  We have final displacement = 5.80 km east = 5.80 i

  From summation we have total displacement = 2 i + 2.47 i - 2.47 j + x i + y j

                                                                           = (4.47+x) i + (y - 2.47) j

  Comparing both , we have 4.47+x = 5.80

                                                        x = 1.33

                                                 y-2.47=0

                                                         y = 2.47 j

  So third displacement = 1.33 i + 2.47 j

  Magnitude of third displacement = [tex]\sqrt{1.33^2+2.47^2} =2.81m[/tex]

  θ = tan⁻¹(2.47/1.33) = 61.70°

  So third displacement = 2.81 m which is 61.70° north of east.

(a) the horizontal force is 11.3 N

(b) The tension in the thread is 22.6 N

Draw a free body diagram for the suspended metal ball as shown in the figure. The tension T acts along the length of the thread, the force F is the horizontal force and its weight is mg, which acts vertically down wards.

Resolve the tension into two components- T cos 30 along the vertical and T sin30 along the horizontal as shown in the figure.

Apply the condition for equilibrium along the horizontal direction.

[tex]F=Tsin30........(1)[/tex]

Apply the condition for equilibrium along the vertical direction.

[tex]mg=Tcos30.......(2)[/tex]

Divide equation (1) by equation (2) and write an expression for F.

[tex]\frac{F}{mg} = tan30\\ F=mgtan30[/tex]

Substitute 2 kg for m and 9.81 m/s² for g.

[tex]F=mgtan30\\ =(2kg)(9.81m/s^2)(tan30^o)\\ =11.3N[/tex]

The horizontal force required to keep the ball taut is 11.3 N

From equation (2),

[tex]T=\frac{mg}{sin30} \\ =\frac{(2kg)(9.81m/s^2)}{sin30^o} \\ =22.6N[/tex]

Thus, the tension in the thread is 22.6 N

In the absence of air resistance , object fall with  same acceleration .

In the absence of air resistance, objects fall at constant acceleration.

Object falling in absence of air resistance is tantamount to object falling in a vacuum. The experiment was performed in Italy by a Physicist known as Galilio Galilian. He dropped two different objects of different masses in the absence of air and discovered that they both landed at the same time.

The objects falling in the absence of air resistance will experience a free fall. And the formula for free fall are :

Non of the above formula depends on the mass of the object but the acceleration due to gravity and the height at which they are falling.

And since the acceleration due to gravity is constant, therefore, In the absence of air resistance, objects fall at constant acceleration due to gravity.

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In an attempt to reduce our dependence on non-renewable resources, and cut down on the harm to the environment, we could burn biomass to produce electricity.

In the SI (International, metric) system of measurement, they are the Kilogram of mass, the Meter of length, and the Second of time.  

With mass, length, and time, you can combine them in enough ways to measure ALMOST everything that can be measured in the physical world, like speed, velocity, acceleration, momentum, area, volume, force, energy, pressure, etc.

'Almost'. You still need a few more to wrap things up.  The other quantities (and their SI units) are:  Electric charge (the Coulomb), temperature (the Kelvin), amount of a substance (the Mol), and luminous intensity (the Candela).  You can't build these with only mass, length, and time.

The three base units of measurement in the International System of Units (SI) are the meter for length, the kilogram for mass, and the second for time.

The three base units of measurement in the International System of Units (SI) are the meter (m) for length, the kilogram (kg) for mass, and the second (s) for time.

The meter is defined as the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second.

The kilogram is defined by the Planck constant as exactly 6.62607015×10−34 kilogram square meter per second.

The second is defined by the cesium-133 atom in ground state, where one second is the duration of 9,192,631,770 periods of radiation corresponding to the transition between two energy levels.

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Final answer:

Momentum determines the movement of two objects after a collision. The total momentum of a two-object system remains constant, generally resulting in motion towards the direction of the larger momentum. Option b

Explanation:

When two objects of unequal mass collide, the direction they will continue to move in after the collision is determined by the momentum they have. According to the principle of conservation of momentum, the total momentum of a system remains constant if no external forces are acting on it.

If we consider two cars with different masses in an inelastic collision, car 1 will slow down, losing some momentum, and car 2 will speed up, gaining momentum.

However, the momentum of the system (both cars) before and after the collision remains the same. The total momentum after the collision will move in the direction of the combined momentum of the two objects prior to the collision.

Generally, this would be in the direction of the object with the larger pre-collision momentum, but the exact direction and speed will depend on the masses and velocities of both objects. Option b

-- At the end of 18sec, the stone's velocity is (9.8m/s² x 18s) = 176.4m/s downward.

-- Starting at 0 m/s and ending at 176.4m/s, its average velocity is 88.2m/s downward.

-- Falling for 18s at an average speed of 88.2m/s, it falls (88.2m/s x 18s) = 1,587.6 m .

-- Its displacement is 1,587.6 meters downward.

The stone's displacement after falling freely for 18 s under the acceleration due to gravity (9.8 m/s²) is 1587.2 meters.

The displacement of an object in free fall can be determined using the equation of motion: S = ut + 0.5gt². In this case, the stone is dropped freely from rest, so the initial velocity (u) is 0 m/s. The acceleration due to gravity (g) is 9.8 m/s² and the time (t) is 18 s. Substituting these values into the equation, we get: S = 0 * 18 + 0.5 * 9.8 * (18)² = 0 + 0.5 * 9.8 * 324 = 1587.2 meters.

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Interneurons.

Their role is to receive signals from from the Sensory Neurons, process them, and communicate the decision to the Motor Neurons. They play a good role in Reflex Arcs.

Speed of Dayshawn travelling towards his home is 12 m/s

Speed of her mom towards his school is 5 m/s

They both starts at same time so whenever they will meet on their path the sum of the distance covered by Dayshawn and distance covered by his mom must be equal to the total distance of school and home

Now let say they both meet after "t" time when they starts motion

so we can write the total distance between school and home as

[tex]d = v_1*t + v_2*t[/tex]

here d = 6492 m

[tex]v_1 = 12 m/s[/tex] = speed of dayshawn

[tex]v_2 = 5 m/s[/tex] = speed of his mom

now by solving the above equation

[tex]6492 = 12t + 5 t[/tex]

[tex]t = \frac{6492}{17}[/tex]

[tex]t = 381.9 s[/tex]

so they will meet after 381.9 s from start which will be 3.36 minutes from there start

Also at this time the distance covered by her mom will be

[tex]d_2 = v_2*t[/tex]

[tex]d_2 = 5* 381.9 = 1909.4 m[/tex]

so they will meet at distance 1909.4 m from their home

The arrow in a chemical reaction can be translated as the following:

A. yields

C. react to form

The arrrow in a chemical reaction is translated to mean a reactant combines to yield or react to form a product: Option A and C are correct.

Arrows in a chemical reaction are very important to differentiate between the reactants and the product.

They are used in chemical reactions to show that the reaction yields a particular product.

For instance, hydrogen reacts with oxygen to yield water as shown;

[tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]

We can see that the arrow in the reaction shows that the reaction of hydrogen and oxygen element yields or react to form water.

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The chemical equation of a chemical must be balanced to obey the law of conservation of mass. Therefore, option (D) is correct.

The equation in which the number of atoms of each element of reactants is equal to the number of atoms of each element of products is called a balanced chemical equation.

The law of conservation of mass obeys by a balancing of a chemical equation for a chemical reaction. According to this law, the mass of matter can neither be created nor be destroyed in a chemical reaction.

By following this law, the total mass of the elements on the reactant side should be equal to the total mass of elements on the product side in a balanced chemical equation.

An example of the balanced chemical equation is the formation of water:

2H₂ + O₂  →  2H₂O

On both sides of the arrow in the equation, the number of hydrogen and oxygen atoms is equal and so are their masses. Therefore this chemical equation obeys the law of conservation of mass.

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The mass of strawberries after freeze-drying would be significantly less than their original mass, given that most of the water content is removed during the process. For 100 kg of fresh strawberries, the approximate mass after freeze-drying would be about 8.4 kg, assuming 91.6% water content.

The approximate mass of strawberries after freeze-drying can be calculated by considering the water content in the fresh strawberries. Fresh strawberries consist of about 91.6% water. During the freeze-drying process, most of this water is removed, hence reducing the mass significantly.

To estimate this change in mass, we can subtract the mass of water (91.6% of the original mass) from the total mass of the fresh strawberries (100 kg). Thus, the dried strawberries would approximately be 8.4% of their original mass, since the mass of fructose and other non-water components remain. This is an estimation and the actual number can be slightly higher or lower depending on the exact freeze-drying process and the specifics of the strawberries.

Therefore, after freeze-drying 100 kg of fresh strawberries, which originally consist of 91.6% water, the approximate mass of the strawberries would be about 8.4 kg.

Thallium (Tl) is a solid at room temperature. It has a melting point of 304 degrees Celsius and a boiling point of 1,473 degrees Celsius.

Thallium (Tl) is a chemical element that is classified as a metal. At standard temperature and pressure conditions, thallium exists in a solid state. This means that it maintains a fixed shape and volume.

The state of matter of an element or compound is determined by its melting and boiling points.

However, at room temperature (around 25 degrees Celsius), thallium remains in its solid state. It has a metallic appearance and is relatively soft and malleable.

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here two cars are placed on an aluminium track

so there is no friction on two carts during their motion and hence there is no external force on them

now if there is no external force so momentum is conserved

[tex]m_1v_{1i} + m_2v_{2i} = m_1v_{1f} + m_2v_{2f][/tex]

here

[tex]m_1 = m_2 = 0.4 kg[/tex]

[tex]v_{1i} = 1.5 m/s[/tex]

[tex]v_{2i} = 0[/tex]

now plug in all values in it

[tex]0.4 * 1.5 + 0 = 0.4* v_{1f} + 0.4*v_{2f}[/tex]

divide whole equation by mass 0.4

[tex]v_{1f} + v_{2f} = 1.5[/tex]

also be the equation of coefficient of restitution

[tex]e = 1 = \frac{v_{2f} - v_{1f}}{v_{1i} - v_{2i}}[/tex]

now we have

[tex]v_{2f} - v_{1f} = 1.5[/tex]

now by solving above equations we will have

[tex]v_{2f} = 1.5 m/s[/tex]

[tex]v_{1f} = 0[/tex]

so after collision speed of two carts is 0 m/s and 1.5 m/s after collision

Speed of the cannon is 95 m/s

now we will find its two components

speed in horizontal direction is

[tex]v_x = 95 cos15[/tex]

[tex]v_x = 91.76 m/s[/tex]

speed in vertical direction is

[tex]v_y = 95 sin(-15)[/tex]

[tex]v_y = -24.6 m/s[/tex]

now the time taken by the cannon to reach the water surface will be find out by using kinematics

[tex]\Delta y = v_y * t + \frac{1}{2} at^2[/tex]

[tex]-3 = -24.6 * t - \frac{1}{2}9.8 * t^2[/tex]

[tex]4.9t^2 + 24.6 t - 3 = 0[/tex]

By solving above quadratic equation

[tex]t = 0.12 s[/tex]

now in the same time the horizontal distance moved by the cannon

[tex]d_x = v_x * t[/tex]

[tex]d_x = 91.76 * 0.12[/tex]

[tex]d_x = 10.93 m[/tex]

Since the distance of crewmen is 20 m so it will definitely safe as cannon will hit at distance 10.93 m

Answer:

Force due to gravity in earth = 74.8*9.8 = 733.04 N

Explanation:

We have mass of Mr. Arbo = 74.8 kg

Force of gravity = Weight = Mass * Acceleration due to gravity value of planet.

In earth acceleration due to gravity value = 9.8[tex]m/s^2[/tex]

So force due to gravity in earth = 74.8*9.8 = 733.04 N

A. Lowering the temperature.

The anser is going to be A.Lowering the temperature.

I HOPE THIS HELPS YOU OUT ALLOT