The average temperature of outer space near Earth is about 50.3 degrees Fahrenheit. In empty, interstellar space, the temperature is just 3 Kelvin, not much above absolute zero, which is the coldest naturally occuring temperature in the universe. Convert 50.3 degF to Kelvin

Answer:

123.48J

Explanation:

Given parameters:

Mass of the ball  = 2.8kg

Height  = 4.5m

Unknown:

Potential energy  = ?

Solution:

The potential energy is the energy due to the position of a body. It is mathematically given as;

      P.E   =  mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now insert the parameters and solve;

          P.E  = 2.8 x 4.5 x 9.8  = 123.48J

Answer:

0

Explanation:

There is 0 PE when its on the ground

Answer:

work done= force × displacement

=800×5

=4000J

Explanation:

The amount of work done is the result of the magnitude of force applied and the displacement of the body due to the force applied. Therefore, work done is defined as the product of the applied force and the displacement of the body.

Answer:

2 pi R / T =     speed of moon

m V^2 / R = G M m / R^2        centripetal force = gravitational force

V^2 / R = G M / R^2

4 pi^2 R^2 / (T^2 R) = G M / R^2     using first equation

R^3 = 1 / (4 pi^2) * G M T^2        we need to know G and M

R^3 = .0253 * 6.67E-11 * 5.98E24 T^2 = 1.01E13 * T^2

63.3 da = 5.47E6 sec

T^2 = 2.99E13 sec^2

R^3 = 1.01E13 * 2.99E13 = 3.02E26 = 302E24 m^3

R = 6.70E8 m from center of earth

Using 1609 m/mile

R = 416,000 miles

Note: our moon is about 239,00 miles away

So this distance is about 1.74 our earth-moon distance

If T^2 proportional R^3    (the moon period is 27.3 da)

63.3/27.3 = 2.32         2.32^2 = 5.38

416/239 = 1.74              1.74^3 = 5.27

Not exact but reasonably close

The total measurement of 4.2, 6.11, and 8.5 using the correct precision in significant figures is 18.8

Measurement simply refers to an act or process through which the size, quantity (amount) dimensions, magnitude, or distance traveled by a physical object or body is taken, especially for the purpose of an experiment.

In Science, precision describes how close together are the numerical values obtained in a series of measurements.

For the total measurement, we have:

Total measurement = 4.2 + 6.11 + 8.5

Total measurement = 18.81

For the correct precision in significant figures, we have:

Total measurement = 18.8 (three significant figures).

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Answer:

Both potential energy and kinetic energy are involved. As the book is falling, its potential energy decreases, and its kinetic energy increases.

Explanation:

The potential energy depends on the height of the book, when the book decreases its height, the potential energy decreases.

The kinetic energy depends on the speed, when the book increases its speed, the kinetic energy increases.

Then, when the book is falling, the height is decreasing and the speed is increasing. It means that the potential energy is decreasing and the kinetic energy is increasing. So, the answer is:

Both potential energy and kinetic energy are involved. As the book is falling, its potential energy decreases, and its kinetic energy increases.

Answer:

-1.82m/s²

Explanation:

Given that the reaction time (t) is negligible and car brakes with constant acceleration.

Initial Velocity (u) = 20m/s

Distance(d) from Intersection when light turns red = 110m

Hence, the magnitude of braking acceleration that will bring the car to rest at exactly the intersection :

Using the motion equation:

v² = u² + 2as

Where v = final velocity at the intersection

u = initial velocity ; s = distance to intersection ; a = acceleration of the car

Exactly at the intersection ; v = 0

0 = 20² + 2×a×110

0 = 400 + 220a

-400= 220a

a = - 400 / 220

a = - 1.818

a = - 1.82 m/s²

- stands for negative acceleration (deceleration)

Considering the Coulomb's Law, the force between the two ballons is 9.216×10⁻⁸ N.

Charged bodies experience a force of attraction or repulsion on approach.

From Coulomb's Law it is possible to predict what the electrostatic force of attraction or repulsion between two particles will be according to their electric charge and the distance between them.

From Coulomb's Law, the electric force with which two point charges at rest attract or repel each other is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them:

\(F=k\frac{Qq}{d^{2} }\)

where:

The force is attractive if the charges are of opposite sign and repulsive if they are of the same sign.

In this case, you know that two balloons have a negative charge of 1.6×10⁻¹⁰ C and the balloons are 0.05 m apart.

Replacing in the Coulomb's Law, you get:

\(F=9x10^{9} \frac{Nm^{2} }{C^{2} } \frac{(-1.6x10^{-10} C)x(-1.6x10^{-10} C)}{(0.05 m)^{2} }\)

Solving:

\(F=9x10^{9} \frac{Nm^{2} }{C^{2} } \frac{2.56x10^{-20} C^{2} }{(0.05 m)^{2} }\)

\(F=9x10^{9} \frac{Nm^{2} }{C^{2} } 1.024x10^{-17}\frac{ C^{2} }{m^{2} }\)

F= 9.216×10⁻⁸ N

Finally, the force between the two ballons is 9.216×10⁻⁸ N.

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Answer: Choice D) 19.6 J

=======================================

Work Shown:

m = 2 kg = mass

g = 9.8 m/s^2 = acceleration of gravity (approximate)

h = 1 m = height

---------

PE = potential energy

PE = m*g*h

PE = 2*9.8*1

PE = 19.6 J

The vase has approximately 19.6 Joules of potential energy.

We didn't have to make any conversions because the unit Joule is equivalent to the more complicated unit of kg*m^2/s^2 so it only involves kilograms, meters and seconds. If however the mass was given in say grams (instead of kg), then you'd need to convert to kg.

Answer:

40m/s

Explanation:

V= u + at

v= 0

a= -10

t= 4

0= u -40

u= 40m/s

just trial!!!!!!!

Answer:

40.2 N

Explanation:

I'm an Acellus student who got it correct.

The magnitude of  y-component of the total force on the skier is 40.18 N.

Force is an influence which tends to set a stationary body in motion or stop a moving body, or which tends to change the speed and direction of a moving body, or which tends to change the shape and size of body.

Given parameters:

Mass of the water: M = 73.8 kg.

Magnitude of force acting at 22.5° angle is: F₁ = 105 N.

Magnitude of force acting at directly backwards is: F₂ = 74.8 N.

We have to find: the y-component of the total force on the skier = ?

As F₂ acting directly backwards, this force has no y-component.

Hence, resultant y-component of the total force on the skier

= F₁ sin22.5°

= 105 ×sin22.5° N.

= 40.18 N.

Hence, magnitude of  y-component of the total force on the skier is 40.18 N.

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The part of the brain that would be responsible for making sure you know who everyone is Hippocampus; option A

The brain is the organ in the body which controls the function of other organs in the body.

The brain is made up of cells called neurons.

The brain is divide into three main parts namely:

The cerebrum consists of two cerebral hemispheres the outer layer called the cortex.

The brainstem consists of the medulla, pons, and midbrain.

The cerebellum consists of three lobes the anterior lobe, the posterior lobe and the flocculonodular lobe.

The hippocampus is part of the temporal lobe which controls recognition and dentification of people.

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The potential energy of the lemming when it lands is 0.9108672 J.

To determine the potential energy (PE) of the lemming when it lands, we need to consider the conservation of energy. The potential energy of an object is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height.

Given:

Mass of the lemming (m) = 0.0780 kg

Height of the cliff (h) = 5.36 m

First, let's calculate the potential energy when the lemming is on the cliff. Using the given formula, we have:

PE = mgh

PE = 0.0780 kg * 9.8 m/s² * 5.36 m

PE = 0.413616 J

Next, we need to determine the final kinetic energy of the lemming just before it lands. We can use the equation for kinetic energy (KE) given by KE = (1/2)mv², where v is the velocity of the lemming.

Given:

Velocity of the lemming (v) = 4.84 m/s

Calculating the kinetic energy, we have:

KE = (1/2) * 0.0780 kg * (4.84 m/s)²

KE = 0.9108672 J

According to the conservation of energy, the potential energy at the top of the cliff is equal to the kinetic energy just before landing.

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Answer:

A car's velocity changes from 25 m/s to 20 m/s in 5 seconds.

Explanination

The force between two parallel wires is 1.53 x 10⁻³ N.

When two wires carrying a current are placed parallel to each other, their magnetic fields will interact, resulting in a force acting between the wires.

The magnitude of the force acting on each wire is equal, but the directions are opposite.

The force between two parallel wires is calculated as follows;

F = (μI₁I₂L) / (2πr)

where;

Substitute the given parameters and solve for the force between the wires;

F = (4π x 10⁻⁷ x 35 x 35 x 0.25) / (2π x 0.04)

F = 1.53 x 10⁻³ N

Thus, the force between two parallel wires is 1.53 x 10⁻³ N.

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The momentum of the truck is "56250 kgm/s".

According to the question,

Mass,

Velocity,

As we know,

→ \(p = mv\)

By putting the values, we get

→    \(= 2250\times 25\)

→    \(= 56250 \ kgm/s\)

Thus the answer is right.

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In a case whereby two springs are attached to two hooks and Spring A has a greater force constant than spring B. Equal weights are suspended from both then Spring B will have more extension than spring A.

Force constant or spring constant  serves as the measure of the stiffness of a spring which can be explained as the force per unit deformation of the spring.

In the case above, we can see that since Equal weights are suspended from both, then there will be more extension at the side of  Spring B  since A has a greater force constant.

Therefore, option B is correct.

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Explanation:

The period of a wave is the time it takes for one complete cycle of the wave to occur, and is usually measured in seconds.

The expression "velocity as a function of time" refers to the change in an object's velocity over time, which can be observed by graphing the velocity against time on a graph.

Speed and time are related in the first equation of motion. V = u + at represents the first motion equation. Here, u denotes the starting velocity, a the acceleration, and t the duration, whereas v denotes the end velocity. The derivative of x with respect to time, or v(t)=ddtx, represents the instantaneous velocity of an object. It is the limit of average velocity as the time approaches zero (t). V (t) equals d d t x (t). Instantaneous velocity has a dimension of length per time, just like average velocity does.

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Answer:

a. chemical reaction

Explanation:

In both a dry and wet cell battery, electric currents are produced through chemical reactions.

Both cells are together called electrochemical cells.

Answer:

Explanation:

the horizontal and vertical component's of the velocity vector:

v_x=vcos\theta=40\ \dfrac{m}{s}\cdot cos40^{\circ}=30.6\ \dfrac{m}{s},v  

x

​  

=vcosθ=40  

s

m

​  

⋅cos40  

∘

=30.6  

s

m

​  

,

v_y=vsin\theta=40\ \dfrac{m}{s}\cdot sin40^{\circ}=25.7\ \dfrac{m}{s}.v  

y

​  

=vsinθ=40  

s

m

​  

⋅sin40  

∘

=25.7  

s

m

.

Let's draw the vector (here one division corresponds to 5 m\s ):

Answer:

B,C,D

Explanation:

Ap3X

Answer:

a short note on exercise

Explanation:

exercise is good for the health

Answer:

brown or black

Explanation:

becuase the colors will layer

Answer:

40  speed and km/h

Explanation:

Velocity:40 km/h 2

Answer:

Objects between the source and observer produce possible shadows known as the umbra and the penumbra.

The umbra is a totally shadowed area, no light travels directly from the source to the observer.

The penumbra is a partially shadowed are where some of the source light travels directly to the observer an some of the source light is blocked from the observer (the object blocking the light is not a point object).

The question apparently refers to the differences seen by the observers.

Table sugar is a compound, it consists of carbon, hydrogen, and oxygen.

Hence, C is the correct answer.

The chemical state of matter consists :

Hence, table sugar is a compound because it is formed by more than 2 chemical elements, and they are chemically bonded together.

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The loss of gravity has a significant impact on the human body. When in a state of weightlessness, the body's muscles and bones are not required to work as hard as they do on Earth.

As a result, astronauts in space experience muscle and bone loss, as well as a decrease in overall physical fitness. This is due to the fact that gravity is no longer providing the resistance needed for muscles and bones to maintain their strength.

This effect can be beneficial for astronauts on a mission to Mars. The journey to Mars takes several months, and astronauts will be in a state of weightlessness for a large portion of that time.

The muscle and bone loss that occurs in space can be used to the astronaut's advantage. When they land on Mars, the planet's gravity will be only about 38% of Earth's. As a result, the astronauts will be better able to adapt to the planet's lower gravity and carry out their mission.

Hence, It's important to note that these effects are not permanent, and scientists are currently researching ways to mitigate the negative effects of weightlessness and to develop exercise regimens and other countermeasures to help astronauts maintain their physical fitness during long-duration spaceflight.

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