the unit of work is what

a gas

hope this is right

the anser on apex is element

Answer

40 degrees

Explanation

When waves hit a surface they get reflected. The law of reflection states that the angle of incidence is equal to the angle of reflection. In this case, the law of reflection tells us that if the angle of incidence is 40 degrees, the angle of reflection is 40 degrees.

Answer:

A) 37 m

Explanation:

When the driver slams on the brakes, the force of friction acting on the car provides the deceleration that will cause the car to stop, according to Newton's second law:

[tex]-\mu mg = ma[/tex]

where

[tex]\mu = 0.80[/tex] is the coefficient of friction

m = 1000 kg is the mass of the car

g = 9.8 m/s^2

a is the deceleration

Substituting into the formula, we find the deceleration:

[tex]a=- \mu g=-(0.80)(9.8 m/s^2)=-7.84 m/s^2[/tex]

Now we can find the length of the skid with the SUVAT equation:

[tex]v^2 - u^2 = 2ad[/tex]

where

v = 0 is the final velocity of the car

u = 24 m/s is the initial velocity

d is the length of the skid

Substituting, we find

[tex]d=\frac{v^2 -u^2}{2a}=\frac{0-(24 m/s)^2}{2(-7.84 m/s^2)}=36.7 m \sim 37 m[/tex]

To answer the question, we shall determine the kinetic energy of the automobile in each case. This can be obtained as illustrated below:

Mass (m) = 450 Kg

Velocity (v₁) = 26 m/s

KE₁ = ½mv₁²

KE₁ = ½ × 450 × 26²

KE₁ = 225 × 676

Mass (m) = 450 Kg

Velocity (v₂) = 30 m/s

KE₂ = ½mv₂²

KE₂ = ½ × 450 × 30²

KE₂ = 225 × 900

Finally, we shall determine the difference in the kinetic energy of the automobile. This can be obtained as illustrated below:

Kinetic energy of case 1 (KE₁) = 152100 J

Kinetic energy of case 2 (KE₂) = 202500 J

Difference = KE₂ – KE₁

Difference = 202500 – 152100

Therefore, the difference in the kinetic energy of the automobile is 50400 J

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The difference in the automobile's kinetic energy between the two velocities is -12.15 kJ.

The kinetic energy of an object is given by the formula KE = 1/2mv², where m is the mass of the object and v is its velocity. To find the difference in kinetic energy between two velocities, we can subtract the initial kinetic energy from the final kinetic energy. Given that the initial mass of the automobile is 450 kg and its initial velocity is 26 m/s, and the final velocity is 30 m/s, we can calculate the initial and final kinetic energies using the formula.

Initial kinetic energy = 1/2(450 kg)(26 m/s)² = 1/2(450 kg)(676 m²/s²) = 72900 J or 72.9 kJ.

Final kinetic energy = 1/2(450 kg)(30 m/s)² = 1/2(450 kg)(900 m²/s²) = 60750 J or 60.75 kJ.

Difference in kinetic energy = Final kinetic energy - Initial kinetic energy = 60750 J - 72900 J = -12150 J or -12.15 kJ.

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Answer:

[tex]2Mg + O_2 \rightarrow 2MgO + heat[/tex] (2 atoms on the product side)

Explanation:

Due to the law of conservation of mass, in every chemical reaction the number of atoms of each element on the reactant side must be equal to the number of atoms of the same element on the product side.

In this case, on the product side we have magnesium (which has two valence electrons) and oxygen (which has two vacancies in its outer shell). This means that they combine in a ratio 1:1, so the product of the reaction is

[tex]MgO[/tex]

However, we must put a coefficient 2 in front of it in order to balance the number of atoms of each element: in fact, on the reactant side we have 2 atoms of magnesium and 2 of oxygen, so we must have two atoms of magnesium and 2 of oxygen on the product side as well. Therefore, the complete reaction is

[tex]2Mg + O_2 \rightarrow 2MgO + heat[/tex]

Answer:

7.3 kg m/s

Explanation:

First of all, let's calculate the gravitational potential energy of the stone as it reaches its highest point:

[tex]U=mgh=(0.28 kg)(9.8 m/s^2)(34.3 m)=94.1 J[/tex]

For the law of conservation of energy, this is equal to the initial kinetic energy of the stone at ground level (where the potential energy is zero), just after the stone leaves your hand:

[tex]K=\frac{1}{2}mv^2=94.1 J[/tex]

From this equation we can find the velocity of the stone as it leaves your hand:

[tex]v=\sqrt{\frac{2K}{m}}=\sqrt{\frac{2(94.1 J)}{0.28 kg}}=25.9 m/s[/tex]

The initial velocity of the stone (before leaving your hand) is zero:

[tex]u=0[/tex]

The impulse received by the stone is equal to its change in momentum, so:

[tex]I=\Delta p=m\Delta v=m(v-u)=(0.28 kg)(25.9 m/s-0)=7.3 kg m/s[/tex]

The magnitude of the impulse the stone received from your hand while being thrown is approximately 17.22 kg*m/s, calculated by considering the conversion of its gravitational potential energy into kinetic energy, and consequently finding the change in momentum.

Given the mass of the stone (m = 0.28 kg) and the height to which the stone rises (h = 34.3 m), the impulse can be calculated using the relationship between impulse, momentum, and energy.

Firstly, as we're considering a height and a resultant vertical motion, we can approach this in terms of gravitational potential energy for simplicity. The stone's kinetic energy is converted to gravitational potential energy at the highest point of its trajectory. So, the potential energy at peak is mgh, which is equal to 0.28 kg * 9.8 m/s^2 * 34.3 m = 93.0284 Joules.

Considering that the kinetic energy the stone started with (K=0.5mv^2) is equivalent to this potential energy (as no energy is lost, only converted), we can derive the initial velocity using v= sqrt(2*K/m).

Now, plug the knowns in to solve for velocity: v= sqrt((2*93.0284Joules)/0.28kg), which gets us v≈61.5 m/s. The magnitude of the impulse is given by the change in momentum, which in this case is the stone's momentum as it leaves the hand (because it starts at rest). So finally, the impulse is equal to the product of the mass of the object and the change in its velocity (Impulse = mv): Impulse = 0.28 kg * 61.5 m/s = approximately 17.22 kg*m/s (rounded).

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Answer:

120 Ns

Explanation:

The impulse exerted on an object is given by:

[tex]I=Ft[/tex]

where

F is the force applied

t is the time taken

In this problem, we have:

F = 40 N

t = 3.0 s

So, the impulse acting on the boat is

[tex]I=Ft=(40 N)(3.0 s)=120 Ns[/tex]

Answer:

120kg*m/s

Explanation:

Flowers that bloom during the winter.

Hope this helps and please mark as brainliest!

- JJ

The Flowers Blooming in Winter are: Acashia, Alstromeria, Amaryllis, Carnation, Chrysanthemums, Cyclamen, Evergreens, Gerbera Daisy, Ginger, Helleborus, Holly berry, Lily, Asiatic Lily, Casa Blanca Lily, Narcissus, Orchid, Pansy, Pepperberry, Phlox, Protea, Queen Ann's Lace, Roses, Star of Bethlehem, Statice.

Given data:

charge 1 (q₁) = 8.0 × 10⁻⁹ coulombs

charge 2 (q₂) = -1.4  × 10⁻⁸ coulombs

distance between fur and brush (r) = 5.0  × 10⁻¹ m

We know that,

           The couloumb's law describes the charge between two particles

Mathematically,

               F = k.(q₁ . q₂)/r²         ----------------------- (i)

             Where F = Force between particles

                         k = constant, 8.99 × 10⁹ Nm²/C²   -------------- (ii)

keep the charge, distance values and value of k in equation  (i), to determine the magnitude of force

                 F = 8.99 × 10⁹ ×{ (8.0 × 10⁻⁹) × ( -1.4  × 10⁻⁸)} / (5.0  × 10⁻¹)²

                    = -4.02 × 10⁻⁶  

The force is negative means "the force is attractive"

Answer:

Light wave can travel in a vacuum and travel at a contest speed even if the light source is moving

Explanation:

Light waves are electromagnetic waves and they need no medium to travel. The speed of light is constant and does not change with the movement of source.

Electromagnetic waves are transfer of energy through vacuum. These electromagnetic waves are associated with specific wavelength, frequency and energy.

Visible light is in between IR and UV waves in electromagnetic spectrum. Light is the fastest moving thing in the world and  it does need a medium to travel. The waves which need a medium to propagate is called mechanical waves.

Therefore, the true statement about light is light waves can travel in a vacuum and travel at a constant speed even if the light source is moving. Thus, option B is correct.

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Energy transferred into a machine equals energy transferred out of it (including waste heat generated by friction). (C)

Answer:

The vertical component of the velocity is about 16 m/s.

Explanation:

The vertical component is the magnitude of the velocity reduced by the sinus of the angle 53 degrees. So

[tex]v_y = |v|\cdot \sin 53^\circ = 20.0 \frac{m}{s}\cdot 0.7986 \approx 16.0 \frac{m}{s}[/tex]

Whatever amount of force each person exerts on the box, THAT's the amount of force the box exerts on him.  There's no reason the forces of each person have to be equal.

Let's say . . .

-- Mr. Smith pushes on the box with 499.99 newton's of force.

-- Mr. Jones is actually a fly; he pushes on the box with 0.01 newton of force.

The total of their forces is 500 Newtons on the box.

The box exerts 499.99 newtons of force back on Mr. Smith, and 0.01 newton of force back on Mr. Jones, the fly.

n physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.

Final answer:

A pendulum swinging back and forth is an example where the amounts of potential and kinetic energy change, but the total mechanical energy remains constant.

Explanation:

An example of a real-world scenario where the amount of potential and kinetic energy change, but the total amount of mechanical energy stays the same is when a pendulum swings back and forth. As the pendulum swings to its highest point, it has maximum potential energy and minimum kinetic energy. As it swings down, the potential energy decreases and the kinetic energy increases until it reaches its lowest point, where it has maximum kinetic energy and minimum potential energy. However, the total mechanical energy of the pendulum remains constant throughout its motion because there is no significant energy loss due to friction.

Two forces pull on an object at the same time. Their resultant force is least when the angle between the forces is 180°.

Answer: Option D

Explanation:

When two forces are acting on an object, two possibilities are there.

(i) Forces acting on the same direction.

(ii) Forces acting o the opposite direction.

When two forces are acting on the same direction, their resultant force will be maximum, but when they are acting on the opposite direction, minimum resultant force will be the outcome (i.e) they are 180 degrees apart.

Under the law of universal attraction:F=km₁m₂/r²=6.67*10⁻¹¹*7.347*10²²*47/3.844*10⁸=23.0321*10¹³/3.844*10⁸=5.99*10⁵≈6*10⁵ N

It's probably going to be a phase out of the approximations

Answer:

(A) 18 km/h

Explanation:

[tex]4.9\frac{m}{s}=4.9\cdot \frac{\frac{1}{1000}km}{\frac{1}{3600}h}=4.9\cdot3.6\frac{km}{h}=17.64\frac{km}{h}\approx18\frac{km}{h}[/tex]

Friction always acts opposite to the motion.  (B)

The acceleration during the segment labeled "A" will be 4 [tex]ms^{2}[/tex].

The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but still not necessarily.

The formula of  acceleration is Δv / Δt.

Where. v is velocity and t is time.

Acceleration can be determined by the the formula :

a = Δv / Δt. = 8 / 2 =  4 [tex]ms^{2}[/tex].

Therefore, the acceleration during the segment labeled "A" will be 4 [tex]ms^{2}[/tex].

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Answer:

1 %

Explanation:

The efficiency of a system is defined as the ratio between the energy produced and the energy in input:

[tex]\eta = \frac{E_{out}}{E_{in}}\cdot 100[/tex]

The same formula can also be rewritten in terms of the power produced and the power in input:

[tex]\eta = \frac{P_{out}}{P_{in}}\cdot 100[/tex]

Since in this problem we have:

[tex]P_{in}=100 W\\P_{out}=1 W[/tex]

The efficiency is

[tex]\eta = \frac{1 W}{100 W}\cdot 100[/tex]=1 \%

Final answer:

The efficiency of the system where a 100-watt light bulb illuminates a solar cell, which powers a water pump with a 1 watt output, is 1%.

Explanation:

The efficiency of the system is calculated by comparing the output power to the input power. In this case, if a 100-watt light bulb illuminates a solar cell and the electricity from the solar cell operates a water pump that delivers 1 watt of power, the efficiency (η) of the system can be found using the formula: η = (output power / input power) × 100%. Therefore, the efficiency of this system is (η = (1 W / 100 W) × 100%) which equals 1% efficiency. This is a simple calculation that demonstrates a common issue with energy conversion systems, where a lot of energy is often lost in the process of converting one form of energy to another, resulting in low conversion efficiency.

Answer:

54.4 m

Explanation:

The work done by the mother in pushing the carriage is equal to:

[tex]W=Fdcos \theta[/tex]

where

F is the force applied

d is the displacement of the carriage

[tex]\theta[/tex] is the angle between the direction of the force and the displacement

In this problem, we have the following data:

[tex]F=62.0 N[/tex] is the force

[tex]W = 2920 J[/tex] is the work done

[tex]\theta=30.0^{\circ}[/tex] is the angle between the direction of the force and the displacement

Re-arranging the equation above and substituting data, we find the displacement:

[tex]d=\frac{W}{F cos \theta}=\frac{2920 J}{(62.0 N)(cos 30^{\circ})}=54.4 m[/tex]

When a force is applied at an angle, we should consider the horizontal component of the force for any horizontal movement. In this case, the mother can push the baby carriage about 54.5 meters by expending 2920 Joules of work.

The subject of the problem involves the concept of work and force in physics. When the mother pushes the baby carriage at an angle, not all of the force she applies is used to move the carriage horizontal. We need to consider the horizontal component of the force which is 62.0N*cos(30.0º) = 53.61047 N. Work is defined as force times the distance over which the force is applied, or in this case, the force times the distance the carriage is pushed. The calculation looks like this:

Work = Force x Distance = 2920 J

Distance = Work / Force = 2920 J / 53.61047 N = 54.48013 m

So the mother can push the baby carriage approximately 54.48013 meters with an expenditure of 2920 joules of work.

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1) 5 N

The crate is initially moving, so we must calculate the force of kinetic friction, which is given by:

[tex]F_f = \mu_k mg[/tex]

where

[tex]\mu_k=0.2[/tex] is the coefficient of friction between the crate (made of wood) and the floor (made of wood). The coefficient of kinetic friction between wood and wood is about 0.2.

[tex]mg=25 N[/tex] is the weight of the crate

Substituting the numbers into the formula, we find

[tex]F_f=(0.2)(25 N)=5 N[/tex]

2) 5 N

There are two forces acting on the crate along the horizontal direction:

- The force that pushes the crate toward the right, of magnitude [tex]F=10 N[/tex]

- The force of friction, which acts in the opposite direction (so, towards the left), of magnitude [tex]F_f = 5 N[/tex]

Since the two forces are in opposite directions, the net force is given by their difference:

[tex]F_{net}=F-F_f = 10 N-5 N=5 N[/tex]

3) Yes

The crate is accelerating. In fact, according to Second Newton's Law:

[tex]F_{net}=ma[/tex] (1)

where Fnet is the net force on the crate, m is its mass, a is its acceleration. We can immediately see that since Fnet is not zero, the acceleration is also non-zero, so the crate is accelerating.

We can even calculate the magnitude of the acceleration. In fact, the mass of the crate is given by:

[tex]m=\frac{Weight}{g}=\frac{25 N}{9.8 m/s^2}=2.55 kg[/tex]

And by using (1) we find

[tex]a=\frac{F_{net}}{m}=\frac{5 N}{2.55 kg}=1.96 m/s^2[/tex]

Exact calculations for solving this physics problem are hindered by a lack of information on the coefficient of friction, but it can be asserted that the net force acting on the crate is 10N, and the crate should be accelerating due to this net force.

In this scenario we're dealing with the concepts of force, friction, and acceleration from the field of physics. Let's go step by step.

1) The frictional force equals the weight of the crate times the coefficient of friction. But since we are not given the coefficient of friction, we cannot calculate it. However, to calculate it, you would use the following formula: Force of Friction = µ * Weight

2) The net force is simply the sum of all forces. Here, there's only one force acting on the crate in horizontal direction - the force of 10N to the right. Therefore, the Net Force = 10 N.

3) If there's a net force acting on an object, it means the object is accelerating, as per Newton's Second Law of Motion(F=ma). This suggests that the crate is indeed accelerating.

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Answer: C) heat

Explanation: As law of conservation of energy applies to all the systems, which says the energy cannot be created nor destroyed, it can only be converted from one form to another.

The light bulb converts electrical energy into light and heat energy.

A) chemical energy is stored in the bonds.

B) Light is a form of electromagnetic radiation.

D) nuclear energy is stored in the nucleus of the atom.

1) 29.8 C

At the beginning, the metal is at higher temperature (70.4 C) while the water is at lower temperature (23.6 C). When they are put in contact, the metal transfers heat to the water, until they reach thermal equilibrium: at thermal equilibrium the two objects (the metal and the water have same temperature). Therefore, since the temperature of the water at thermal equilibrium is 29.8 C, the final temperature of the metal must be the same (29.8 C).

2) 6.2 C

The temperature change of the water is given by the difference between its final temperature and its initial temperature:

[tex]\Delta T = T_f - T_i[/tex]

where

[tex]T_f = 29.8 C\\T_i = 23.6 C[/tex]

Substituting into the formula,

[tex]\Delta T=29.8 C-23.6 C=6.2 C[/tex]

And the positive sign means that the temperature of the water has increased.

3) -40.6 C

The temperature change of the metal is given by the difference between its final temperature and its initial temperature:

[tex]\Delta T = T_f - T_i[/tex]

where

[tex]T_f = 29.8 C\\T_i = 70.4 C[/tex]

Substituting into the formula,

[tex]\Delta T=29.8 C-70.4 C=-40.6 C[/tex]

And the negative sign means the temperature of the metal has decreased.

Answer:

29.8, 6.2, -40.6

Explanation:

a) Speed: It is the ratio of distance covered and time interval to cover that distance

it is given as [tex]speed = \frac{distance}{time}[/tex]

b) Direction: it will define for vector quantities and shows the required direction for it

c) Velocity : It is rate of change in position or it is ratio of displacement and time

d) Vector : it is a type of physical quantity which will be defined by magnitude and direction both

e) Position : it is defined as the distance with respect to a given reference or origin

f) Acceleration : it is defined by rate of change in velocity.

[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]

g) Force = it is push or pull on an object which will create acceleration to the object

F = ma

it is product of mass and acceleration

h) Newton : it is SI unit of force or we measure force in this unit

Since angles a and c are alternate interior angles formed by a transversal intersecting two parallel lines, they are congruent. Therefore, angle b must also be equal to angle c. So, the correct answer is: A) equal to Angle c

If angles "a," "b," and "c" are part of a triangle, then the sum of the interior angles of a triangle is always 180°. Given that angle "a" is 25°, the sum of angles "b" and "c" must be 180° - 25° = 155°.

With this constraint, we can't determine whether angle "b" is greater than, equal to, or less than angle "c" without additional information about their specific values. If one angle is specified, the other angle can be found using the fact that the sum of angles in a triangle is 180°. For example, if angle "c" is known to be, say, 70°, then angle "b" would be 155° - 70° = 85°.

In summary, the relationship between angle "b" and angle "c" depends on their specific values or additional constraints provided. Without this information, we cannot make a definitive comparison between them. Therefore, the correct answer to the given question would be that we cannot determine the relationship between angle "b" and angle "c" based solely on the measure of angle "a."

Basically a distance multiplied by a weight that is equal to the distance that is going to be multiplied by the weight. (for the equation we will use X for the distance).

equation: 4 x1 20 = ? x 80

Now step one: 4(120) = X(80)  

Or another way is 480 = 80X  

480/80 = X  

48/8= X  

X = 6

I hope this could help! Sorry if it didn't make much sense otherwise!

-4.73 m/s²

Each jumper represents about 1/2 of 1% of the mass of the train, so together they total about 3.5% of the mass of the train. If the mass decreases by 3.5% and the braking force remains the same, the acceleration (magnitude) will increase by about 3.5%.

The acceleration will be about 0.17 m/s² more (in magnitude) than it was, or about -4.73 m/s².

the answer is static friction

Answer:

Static friction.

Explanation:

I had this question, it was worded a bit differently. Hope this helped!