HELP ME PLEASE !!!!!!!!!!!!!!!!!

Answer:

Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.

Explanation:

Answer:

Displacement

Explanation:

Velocity is more like displacement because

Both have an arrow above their signs which indicates they are vectors.

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Answer:

The answer is

Q=It.

=60×0.4=24C

Answer: Look for something that is not working as well as it should, or is inconvenient.

Explanation: Ask youself (or other s) how it could be improved. Imagine a way to make it better. Draw a design, or make a model or experiment to see if the change you propose will work. You could do research for examples of similar situations to see what others have tried.

You could invent an entirely new solution!

Answer:

The correct answer is D. Static friction is much stronger than kinetic friction, so it takes more force to get an object moving than it does to keep it moving.

Explanation:

We can eliminate choice A if we know that both static friction and kinetic friction depend on what are called the coefficients of static friction and kinetic friction, respectively.  These coefficients are a reflection of the nature of the surface.  In other words, both static friction and kinetic friction depend on the surface material (choice A is incorrect).

Choice B is incorrect because static friction applies to still (static) object whereas kinetic friction applies to moving objects (that have kinetic energy).

Choice C is also incorrect.

Choice D is correct as described in the given information.  It takes much more force to start an object from rest than to keep it moving.  Think about things in your everyday life - it takes a push to get a toy car moving along the ground, but you do not need to consistently push the car with the same force to keep it moving.  This reflects that static friction is much stronger than kinetic friction, which is also described by the relationship between their coefficients (the coefficient of static friction is generally greater than that of kinetic friction).

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Answer:

The height of the cliff is approximately 127.31 meters

Explanation:

The given parameters are;

The upward speed of the ball = 30 m/s

The time after the ball is thrown before it lands = 9 s

We have;

The time to maximum height;

v = u - g·t

Where;

v = The velocity at maximum height = 0 m/s

u = Initial velocity = 30 m/s

g = The acceleration due to gravity = 9.81 m/s²

∴ 0 = 30 - 9.81 × t

t = 30/9.81 = 3.06 s

The maximum height can be obtained from;

v² = u² - 2·g·s

v = 0 m/s

u² = 2·g·s

30² = 2 × 9.81 × s

s = 30²/(2×9.81) = 45.87 m

The time from maximum height to landing = 9 - 3.06 = 5.942 s

The height to landing

s = u·t + 1/2·g·t².

Here, u = 0 m/s

s = 0×5.942 + 1/2×9.81×5.942² = 173.1766 m

s = 173.1766 m.

The height of the cliff = 173.1766 m. - 45.87 m. ≈ 127.31 m.

Answer:

[tex]\boxed{\sf Time \ being \ in \ which \ body \ remains \ in \ air = 4 \ s}[/tex]

Given:

Velocity (u) = 20 m/s

Acceleration due to gravity (g) = 10 [tex]\sf m/s^2[/tex]

To Find:

Time (t) being in which body remains in air.

Explanation:

Formula:

[tex]\boxed{\bold{\sf t=\frac{2u}{g}}}[/tex]

Substituting values of u & g in the equation:

[tex]\sf \implies t = \frac{2 \times 20}{10}[/tex]

[tex]\sf \implies t =\frac{40}{10}[/tex]

[tex]\sf \implies t =\frac{4 \times \cancel{10}}{ \cancel{10}}[/tex]

[tex]\sf \implies t = 4 \ s[/tex]

[tex]\therefore[/tex]

Time (t) being in which body remains in air = 4 seconds

Answer:

1.2e+11

Explanation:

120,000,000,000 picometers

Explanation:

Answer:All professors planned and thought about data before graph construction. When reflecting on their graphs, professors and graduate students focused on the ... feel more inclusive in the learning process and gain better science process skills, ... We organized data in a table instead of a paragraph with numbers

Explanation:

hope that helps

Answer:

Explanation:In the natural sciences we make observations and construct models.

If those models are consistent with our observations then we can make predictions from those models and test them against more observations.

If some observations contradict our models, then we can tell that our models are wrong or in need of modification.

For example, Newton's laws of physics provide pretty good models sufficient in accuracy to allow us to calculate how to land a man on the moon. Are they therefore true? Not exactly. Newton's laws fail to work well at velocities approaching the speed of light. So we can tell that they need some adjustment.

Einstein's special and general theory of relativity provide more accurate models. So are they true? They predict all sorts of strange behaviour which we have actually observed. They seem to provide useful models, but they do not explain everything. For example, the extreme conditions in a black hole or those we think existed at the start of the universe provide some challenges to General Relativity.

From a practical perspective it is useful to operate within theoretical frameworks that we treat as facts. We need to make assumptions in order to reach substantial conclusions. So we often act as if something like Big Bang theory is a fact, but we cannot know it to be so.

Essentially in any natural science we cannot prove anything to be true. We can demonstrate that theories are false. This is the honesty of science.

Consider an alternative theory: The universe and everything you "know" actually started  

10

minutes ago.

You may protest that you remember what you did yesterday. In my theory I can explain that these are simply implanted memories, not real. What about radiometric dating? What about the Andromedra galaxy being  

2.5

million light years away, so the light we see from it started travelling in our direction  

2.5

million years ago? In my theory I can claim that these are all an elaborate implanted fiction.

There is no way to prove that this theory is true and probably no way to prove that it is false.

Answer:

Electromagnetic spectrum is the arrangement of all kinds of radiation according to their frequency and wavelength. They don't require a material medium for their propagation.They are transverse waves that travel in a direction perpendicular to the direction of vibration.

Answer:

The kinetic energy is  

= 1250 j

Explanation:

The kinetic energy is

KE = 1/2mv²

The mass is m = 25kg

The velocity is  v = 10ms^1

So,  KE = 12.25.10² = 1250 j

Answer:

Distance = 10m

Imagine a triangle

Length = 4 - 1 = 3

Height = 2 + 2 =4

Hypothenuse = Displacement

Displacement = 5

Answer:

Explanation:

From newton's equation of motion of uniform acceleration

v = u + at

where v is final velocity , u is initial velocity , a is acceleration and time is t .

putting the values

v  =  0 + .5 x 3 x 60  ( time in second = 3 x 60 s )

= 90 m /s

So  , final velocity is 90 m /s .

Answer:

0.067 meters

Explanation:

[tex]1 \: cm \: \: = 0.01 \:meters \\6.7 \:cm = x \:meters\\\\x = 0.067 \:meters[/tex]

Answer:

physics

kinematics

dynamics

fluid mechanisms

earth sciences

Answer:

VELOCITY

Explanation:

Since the gravitational potential energy of an object is directly proportional to its VELOCTY above the zero position, a doubling of the velocity will result in a doubling of the gravitational potential energy.

Answer:

ans is 420ml

Explanation:

0.42L×1000ml

420ml

Answer:

The  correct option is  A

Explanation:

From the question we are told that

   The  velocity of the spy relative  to the carrier is  [tex]v_s = -4 \ m/s[/tex]

    The  velocity of  the aircraft carrier is  [tex]v_a = 12 \ m/s[/tex]

Generally the velocity of the spy according to the person standing stationary on the beach is mathematically represented as

         [tex]v = v_s + v_a[/tex]

          [tex]v = -4 + 12[/tex]

         [tex]v = 8 \ m/s[/tex]

Answer:

C. Heat moves as molecules of one substance collide with molecules of another substance, transferring kinetic energy.

Explanation:

I tried it and got it right.

Answer:

2 N

Explanation:

From the question, it's given that

Mass m = 0.2 kg

Acceleration a = 10 m/s^2

The force a soccer goalie experience when stopping a ball will be equal to the force at which the ball is being kicked. This is

F = ma

Substitute all the parameters into the formula

F = 0.2 × 10

F = 2 Newton.

Correct question is;

Talia is on a road trip with some friends. in the first 2 hours, they travel 100 miles. then they hit traffic and go only 30 miles in the next hour. the last hour of their trip, they drive 75 miles. calculate the average speed of talia’s car during the trip. give your answer to the nearest whole number.

Answer:

Average speed ≈ 51 mi/hr

Explanation:

Total distance travelled by Talia = 100 + 30 + 75 = 205 miles

Total time taken by Talia = 2 + 1 + 1 = 4 hours.

Now, formula for average speed is;

Average speed = Total distance/total time

Thus;

Average speed of talia = 205/4

Average speed of talia ≈ 51 mi/hr

Answer:

True

Explanation:

When no net force is applied to a moving object, it still comes to rest because of its inertia.

It is a true statement that an object wants to maintain its state of motion because it has mass, as per the first law of the motion due to the effect of inertia an object tries to maintain its state of motion whether it would be a state of motion or the state of the rest.

According to Newton's first law, until pushed to alter its condition by the intervention of an external force.

Every object will continue to be at rest or in uniform motion along a single direction.

It is true that an item wants to keep moving because it has mass. According to the first law of motion, this is because of the influence of inertia, which causes an entity to try to keep moving whether it is in movement or at standstill.

Learn more about Newton's first law from here,

brainly.com/question/1222214

#SPJ2

The grade is also the tangent of the angle above horizontal.

The angle whose tangent is 0.317 is called the "arctangent" of 0.317

It's 17.6 degrees.

Answer:

Explanation:

velocity=s/t

given distance is 480 km we have to convert it into meter because the unit of distance is meter

1 km=1000 m

480 km=480000 m =4.8*10^5

1 hour= 3600 s

12 hour =43200 s  

now velocity=s/t

v=4.8*10^5/43200

v=11.11 m/s

Answer:

The correct answer is 40

Explanation:

Divide 480 and 12 that  = 40v

Hoped I helped

Answer:

It will float

Explanation:

its density is lower than density of water

Its density is 670 / 782 = 0.856 kg/m³

Answer:

hello the options to your question is missing below are the options

culture

heredity

physical environment

social environment

answer : social environment

Explanation:

Claire ability to lose weight due to the encouragement and support of her friends shows that she was ability to achieve her goal due to her social circle ( friends ). therefore the face time that helped her lose weight is her social environment and not culture nor any other option as mentioned above.

social environments help/play a vital role in individual's life a lot as long as every human being is a social being

Answer:

[tex]\Huge \boxed{\mathrm{10 \ N}}[/tex]

Explanation:

[tex]\sf Force \ (N)=mass \ (kg) \cdot acceleration \ (ms^{-2})[/tex]

[tex]F=ma[/tex]

The mass is 2 kg.

The acceleration is 5 ms⁻².

[tex]F = 2 \cdot 5[/tex]

[tex]F=10[/tex]

The force is 10 N.

Answer:8.86 N

Explanation:

Volume of water in cylinder is V= ((3.14*0.06)/4)*0.32=0.0009047

Mass of water is = 0.0009047*998=0.903

Force applied by water is 0.903*9.83=8.86N