A crowbar is being used with an actual mechanical advantage of 8. If the input force is 400 Newton’s on the 0.3 meter long end of the crowbar, what is the output force on the short end?

a) 960 N
b) 50N
C) 3,200 n
D) 120 n

Answer:

E D G E N U I T Y

Explanation:

lol

a) The tension in the vine just before it broke was 845.72 N.

b) Tarzan doesn't  land safely on the other side of the river.

Weight gauges how much gravity is pulling on a body. The weight formula is provided by: w = mg. Weight being a force The SI unit of weight is the Newton, which is also the same as the SI unit of force (N). When we look at how weight is expressed, we can see that it depends on both mass and the acceleration caused by gravity; while the mass may not change, the acceleration caused by gravity does.

Given parameters:

Wide of the river: d = 5.00 m.

Length of the tree branch: l = 8.00 m.

Initial angle of the tree branch = 60°.

Angle of tree branch when it breaks = 20.0°.

a) Weighs of Tarzan: W = 900.0 N.

The tension in the vine just before it broke = W cos20°

= 900.0 × cos20° N.

= 845.72 N.

b) Distance traveled by Tarzan using this branch = lsin60° - lsin20°

= 8.0( sin60° - sin20°) m = 4.19 m.

Hence, he doesn't land safely on the other side of the river.

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Answer:

B or C

Explanation:

Answer:

"light year" - about 6 million million miles

The nearest star is alpha Centauri - about 24 million million miles away

Answer:

The material that Emily invented can be easily repaired by shining ultraviolet light on it.

Explanation:

Hope it helps! Please mark brainliest.

Answer:

The material that Emily invented can be easily repaired by shining ultraviolet light on it.

Explanation:

Answer:

24.2 m/s

Explanation:

Mass is irrelevant in this situation....

Displacement:  ( to find time)

 x = xo + vo t - 1/2 at^2

 30= 0   + 0  - 1/2 (9.8)t^2

              t = 2.47 seconds

Velocity:

vf = a t   = 9.8 (2.473)  = 24.2 m/s

Answer: Distance traveled in time t is s

Explanation: Self Explanatory

Answer:

a) ω = 4.49 rad/s

b) v = 2.69 m/s

Explanation:

a) The angular speed can be found by using the rotational rate:

\( \omega = \frac{1 rev}{1.4 s}*\frac{2\pi rad}{1 rev} = 4.49 rad/s \)

Hence, the angular speed is 4.49 rad/s.

b) The tangential speed is given by:

\( v = \omega*r = 4.49 rad/s*0.6 m = 2.69 m/s \)

Therefore, the tangential speed is 2.69 m/s.

I hope it helps you!            

Answer:

Force and pressure

Explanation:

Pressure is inversely proportional to area

Or by using:

Force and pressure

Of course a burnt nail is “ scorched “ meaning it doesn’t have that much “ power “ or it an chip away

Force and pressure

Renewable resources can be replenished by natural process within hours to centuries.

Renewable energy is energy this is constituted of herbal methods and continuously replenished. A few examples of renewable electricity are daylight, water, wind, tides, geothermal warmness, and biomass.

Plastic is made from crude oil, a nonrenewable useful resource. even though the plastic we use may be recycled, the quantity of stable waste generated by plastic is turning into a trouble.

“Sand is not a renewable aid,” Parkinson stated. “while sand is eroded from the seashore during a typhoon, it commonly accumulates in offshore regions as a very thin layer that can not be dredge again to assemble a new seaside or dune.”

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Answer:

B. They reproduce

Explanation:

Both arent made up of one cell, and both arent made up of mutliple cells. Only some unicellular and multicellular organisms are infectious.

Answer:

Your answer would be:
B.) They reproduce.

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions.

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism. Multicellular organisms use many different cells to function.

Unicellular organisms are single-celled.

Multicellular organisms are multi-celled.
However, both reproduce.




Explanation:

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To express the decimals as powers of ten, the answer will be a) 5 ×10-¹, b) 1.04×10-³, c) 8.4 ×10-², d) 3.6×10-⁴.

A decimal is a number with a whole and a component of fraction. Decimal numbers, which are in between integers, are used to express the numerical value of whole and partially whole quantities.

As with multiplying decimals (see Decimal Multiplication), count the base number's decimal places before multiplying by a decimal. Add the exponent to that number after that. The total number of decimal places in the response will be this.

Therefore, the answer will be

a) 0.5 = 5 ×10-¹

b) 0.001 04 = 1.04×10-³

c) 0.084 = 8.4 ×10-²

d) 0.000 36 = 3.6×10-⁴

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Let's name all the variables that are given and that we know.

yi: initial height; yi = 1.3 m

vi: initial upward velocity; vi = 8.8 m/s

g: gravitational acceleration; g = 9.81 m/s^2

t: time; let's make this the independent variable.

y: height; let's make this a dependent variable.

v: velocity; let's make this another independent variable

We can derive equations relating time (t) in seconds and height (y) along with velocity (v).

y = yi + vi*t - (g/2)*t^2

v = vi - g*t

(This is done by integrating the acceleration function, but that's not important as long as you can recall this formula)

Now let's plug in the variables we know into both these equations.

y = 1.3 + 8.8t - (9.81/2)t^2 (let's call this the height function)

v = 8.8 - 9.81t (let's call this the velocity function)

Now we're ready to answer part (a).

From the start of the scenario, the ball continues to travel upward, until it reaches its maximum, at which point its velocity is momentarily zero, then starts to decrease.

This means that at its highest point, the ball has a velocity v = 0.

We can then use the velocity function and solve for t when the ball is at its highest.

0 = 8.8 - 9.81t

9.81t = 8.8

t = 0.897 seconds (answer to part (a))

Now we're ready to answer part (b).

Now that we know the time it takes for the ball to reach its maximum height, we can use that value for t (t = 0.897), and solve for y using the height function.

y = 1.3 + 8.8*0.897 - (9.81/2)*0.897^2

We can simply plug the right side into a calculator to solve for y.

y = 5.247 meters (answer to part (b))

Now we're ready to answer part (c).

So we're given an initial condition that y = 2.6m.

We can plug this value in for y in the height function and solve for t.

2.6 = 1.3 + 8.8t - (9.81/2)t^2

Solving using the quadratic formula (or any other method of your choice for solving quadratics), you actually get two answers. This is because the ball reaches 2.6m twice; first when it's going up, then again when it comes back down.

t = 0.162s, 1.632s

However, since the motion is parabolic, the velocity at 1.632s will just be negative of the velocity at 0.162s, so we can just plug in 0.162 for t, and use the velocity function to solve for v.

v = 8.8 - 9.81*0.162

Plugging the right side into a calculator,

v = 7.211 m/s (answer to part (c))

For determining g (gravity), seminal free-fall experiment using inclined plane is preferable to the simple drop method because in simple drop method there is resistance caused by air on the falling object whereas on the seminal free-fall method using inclined plane air resistance has little to no effect.

Galileo was an Italian scientist who combined theory with experiment. He was very much interested in understanding the movement and falling of objects.

Objects when falling down would accelerate quickly i.e., let’s take an object falling at the speed of x, after time t it would travel at 2x, after 2t it would be 4x. Therefore, it is difficult to time with accuracy. Thus, inclined plane would help to dilute the effects of gravitational force and reduce the time.

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If a particle's velocity is nonzero, then its acceleration can be zero, because acceleration is the rate of change of velocity. If the velocity is constant and does not change, the acceleration is zero.

The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations. The orientation of an object's acceleration is determined by the orientation of its net force.

Because velocity is both a speed and a direction, there are only two ways to accelerate: modify your speed or your direction—or both.

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The velocity and acceleration of the marble will be greater when it travels 1.5 m compared to 0.5 m.

The velocity of an object is the rate of change of displacement with time.

The velocity of the marble after it has travelled the given distance is calculated as follows;

v² = u² + 2as

where;

Assuming the marble started from rest, without initial velocity, our final equation becomes.

v² = 0² + 2as

v² = 2as

v = √2as

From the final equation, the velocity of the marble increases with increase in the distance travelled by the marble.

Also, since acceleration is defined as the rate of change of velocity with time. As the velocity increases, the acceleration of the marble increases as well.

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Answer:

\(kinetic \: energy = \frac{1}{2} m {v}^{2} \\ m = mass \: of \: the \: object \\ v = velocity \: \)

Answer:

I think it's just 100+70+140

The kind of equation that we can use to solve the problem is;   x = 1/2* (vf+vo) * t. Option B

Th equations of motion has to do with the equations that we cam be able to apply so as to solve the equations that are for the uniformly accelerated motion.

In the case of the problem that we have in this question, we have been told that A train decreases speed from 30 m/s to 20 m/s while in 20s. The formula that can be used to get the displacement of the train is  x = 1/2* (vf+vo) * t.

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Answer:

x = 50 N

Explanation:

Given that we have a net force, a mass, and acceleration, we can use the fundamental formula for force found in newton's second law which is F = m × a.

Given a mass of 150 kg, and an acceleration 3.0m/s². We can substitute these two values in our formula to calculate the magnitude of these forces or it's net force to identify the unknown force acting on our known force for this situation to work.

_______

F (Net force) = F2 (Second force which we are given) - F1 (First force) = m × a

m (mass which we are given) = 150 kg

a (acceleration which we are given) = 3.0m/s

________

So F = m × a → F2 - F1 = m × a →

500 - F1 = 150 × 3.0 → 500 - F1 = 450 →

-F1 = -50 → F1 = 50

The kilogram is an SI base unit that makes up part of the unit of energy, therefore the correct answer is option D

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.

The base SI units are meter, kilogram, second, kelvin, ampere, candela, and mole

The unit of energy is Joules which is equivalent in mks unit as Kg m²s⁻²

Thus, The kilogram is an SI base unit that makes up part of the unit of energy, therefore the correct answer is option D

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Explanation:

distance and time both are scaler quantity

The scalar quantity that can be found out from distance and time is speed, which will be equal to 12 m/s.

The amount of the shift in approach per unit of time or the size of the displacement over time for an object can be used to describe speed, which would be a scalar quantity used in everyday language and kinematics.

The maximum speed that can be maintained when a time period grows closer to zero is the starting speed.

By dividing the object's traveled by the duration of the interval, the mean pace of the object for the given period of time is calculated. Speed and velocity are not always the same thing.

As per the given information in the question,

Distance, d = 240 m

Time, t = 20s

Then, the Speed will be,

s = d/t

s = 240/20

s = 12 m/s.

Therefore, speed is the scalar quantity that is 12 m/s.

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To find the mass in kilograms, you need to know the object's weight in newtons and the acceleration due to gravity. The formula for finding mass is mass = weight / acceleration due to gravity. So if you have an object with a weight of 100 N and the acceleration due to gravity is 9.8 m/s^2, the mass would be 10.204 kg.

The mass of the block is 0.025 kg or 25 g, when the spring has k = 28 N/m, and compresses 0.11 m before bringing the block to rest.

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Answer:

carbon.

Explanation:

the reaction would then create c02 as a product

Answer:

inventions

Explanation:

some philosophers do not believe that free will is required for moral responsibility. According to John Martin Fischer, human agents do not have free will, but they are still morally responsible for their choices and actions. ... We thus see that free will is central to many philosophical issues.

Answer: The egg will get sucked into the bottle. To get the egg out of the bottle, turn the bottle upside down and blow into it, so that the egg acts as a one-way valve. The increased air pressure in the bottle will cause the egg to pop back out.

Explanation:

Quickly place the egg over the mouth of the bottle. The egg will get sucked into the bottle. To get the egg out of the bottle, turn the bottle upside down and blow into it, so that the egg acts as a one-way valve. The increased air pressure in the bottle will cause the egg to pop back out.

\(\implies\)1115.2 Joules

\(\red{\leadsto}\:\)\(\textsf{Height\: at \:rest\:} \)\(\sf,h_2= 53.0m \)

\(\green{\leadsto}\:\)\(\textsf{Height\: to\:which\;block\:}\)\(\sf,h_1= 21.3 \)

\(\maltese\)As the block falls , the change in potential energy will be converted into kinetic energy

\(\leadsto\)Potential Energy at rest at height,\(h_2\) = \(\sf mgh_2\)

\(\leadsto\)Potential Energy when fell at height,\(h_1\) = \(\sf mgh_1\)

\(\\\)

\(\leadsto\)Kinetic energy= Change in Potential energy = = \(\sf mgh_2-mgh_1\)

\(\begin{gathered}\implies\quad \sf mg(h_2-h_1) \\\end{gathered} \)

\(\begin{gathered}\implies\quad \sf mg(53.0-21.3) \\\end{gathered} \)

\(\begin{gathered}\implies\quad \sf 3.59 \times 9.8\times (53.0-21.3) \\\end{gathered} \)

\(\begin{gathered}\implies\quad \sf 3.59 \times 9.8\times 31.7\\\end{gathered} \)

\(\begin{gathered}\implies\quad \boxed{\sf{1115.2\: Joules}}\\\end{gathered} \)

According to the given statement The new acceleration is 21 m/s².

The correct option is D.

Any process where the velocity varies is referred to as acceleration. There are only two ways to speed up: changing your speed or changing your direction, or changing both. This happens because velocity entails both a speed and a direction.

The initial force is F = mass x acceleration

F = 3.17515 kg x 7 m/s²

F = 22.23 N

When the net force is tripled, the new acceleration will be

3 x F =m x a'

3 x 22.23 = 3.17515 x a'

a' = 21.003 m/s²

The new acceleration is 21 m/s². The correct option is d.

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The complete question is -

A 7 lb bowling ball accelerates at a rate of 7 m/s². If the net force on the bowling ball is tripled, what will be its new acceleration?

a. 2.3 m/s²

b. 7 m/s²

c. 14 m/s²

d. 21 m/s²

Answer: A sonic boom is a sound associated with shock waves created when an object travels through the air faster than the speed of sound. Sonic booms generate enormous amounts of sound energy, sounding similar to an explosion or a thunderclap to the human ear. The crack of a supersonic bullet passing overhead or the crack of a bullwhip are examples of a sonic boom in miniature. Sonic booms due to large supersonic aircraft can be particularly loud and startling, tend to awaken people, and may cause minor damage to some structures. They led to prohibition of routine supersonic flight over land. Although they cannot be completely prevented, research suggests that with careful shaping of the vehicle, the nuisance due to the sonic booms may be reduced to the point that overland supersonic flight may become a feasible option. A sonic boom does not occur only at the moment an object crosses the speed of sound; and neither is it heard in all directions emanating from the supersonic object. Rather the boom is a continuous effect that occurs while the object is travelling at supersonic speeds. But it affects only observers that are positioned at a point that intersects a region in the shape of a geometrical cone behind the object. As the object moves, this conical region also moves behind it and when the cone passes over the observer, they will briefly experience the boom.

Explanation:

As incredible as the Concorde was, the sonic booms created by its supersonic flights were so disruptive that most countries restricted or completely prohibited the aircraft from flying over land.  The sonic boom, at its worst, would be heard as a very loud thunder clap that was right overhead. The force of the boom rattled windows and loosened roof tiles. But even when the sonic boom sounded like a “softer” distant thunder clap, it was distracting to people and caused disruption of sleep and interruptions in activity. Imagine that you are driving on your way to work, and with clear skies overhead, you suddenly hear the sound of thunder. Your immediate responses are most likely surprise, shock, and an instinctive search for the source. Being caught by surprise in certain situations is rather annoying, and in others, potentially dangerous. In 1964, the FAA and NASA conducted a six-month sonic boom research project in Oklahoma City – without warning residents beforehand. The experiment consisted of eight sonic booms, every day, for six months. 15,000 complaints and a class action lawsuit were filed. The government lost on appeals. Great idea, guys, just brilliant. When the Concorde was originally designed, in the early 1960s, governments and airlines around the world lined up to place orders. The plane did an around-the-world publicity trip, and was well-received. But as awareness of the sonic boom effect grew, almost every country banned the aircraft. Only the US, Great Britain, and France allowed the Concorde to enter their airspace, and then only to cities in close proximity to the ocean – NYC, London, Paris, and Washington, DC. The Concorde was specifically designed for supersonic flight (specifically, Mach 2) and was very fuel-inefficient at subsonic speeds (less than Mach 1). Unfortunately, it was thus not feasible to fly at supersonic speed over water and then at subsonic speed over land.

What causes a sonic boom?  

When any object moves, it creates waves in front of and behind it. Think of the waves that a boat creates at its bow and stern. In front, the waves are compressed together as the boat sails forward. Behind, the waves spread out away from the boat. In this case, you only see the waves on the surface of the water, and it appears two-dimensional. Similar principles are at play with aircraft. In front of the nose of a plane, air is pushed together and compressed as the aircraft flies forward. Behind the plane, the air creates waves that radiate out and away in the shape of a cone – three-dimensionally.

Answer:

A sonic boom is caused by the shock waves created when an object travels through the air faster than the speed of sound.

Explanation:

When any object moves, it creates waves in front of and behind it. Think of the waves that a boat creates at its bow and stern. In front, the waves are compressed together as the boat sails forward. Behind, the waves spread out away from the boat. Similar principles are at play with aircraft. In front of the nose of a plane, air is pushed together and compressed as the aircraft flies forward. Behind the plane, the air creates waves that radiate out and away in the shape of a cone – three-dimensionally. Things get interesting, and complicated, when you fly faster than the speed of sound – supersonic flight. The nose of a supersonic aircraft pushes ahead of its forward waves. These waves get in the way of the airplane, causing compression which results in a shock wave. Actually, this creates two shocks, one forming as the aircraft passes the front of the wave and then another as it leaves the wave. The shock wave generated stays mostly behind the aircraft, and radiates out in a cone