How much momentum will a dumb-bell of mass 10 kg transfer
to the floor if it falls from a height of 80 cm? Take its downward
acceleration to be 10 m s–2 .

Answer:

B

Explanation:

Took on Edge 2022

Explanation:

(a)

The initial vertical velocity is 13 m/s.  At the maximum height, the vertical velocity is 0 m/s.

v = at + v₀

0 = (-9.8) t + 13

t ≈ 1.33 s

(b)

Immediately prior to the explosion, the ball is at the maximum height.  Here, the vertical velocity is 0 m/s, and the horizontal velocity is constant at 25 m/s.

v = √(vx² + vy²)

v = √(25² + 0²)

v = 25 m/s

(c)

Momentum is conserved before and after the explosion.

In the x direction:

m vx = ma vax + mb vbx

m (25) = (⅓ m) (0) + (⅔ m) (vbx)

25m = (⅔ m) (vbx)

25 = ⅔ vbx

vbx = 37.5 m/s

And in the y direction:

m vy = ma vay + mb vby

m (0) = (⅓ m) (0) + (⅔ m) (vby)

0 = (⅔ m) (vby)

vby = 0 m/s

Since the vertical velocity hasn't changed, and since Fragment B lands at the same height it was launched from, it will have a vertical velocity equal in magnitude and opposite in direction as its initial velocity.

vy = -13 m/s

And the horizontal velocity will stay constant.

vx = 37.5 m/s

The velocity vector is (37.5 i - 13 j) m/s.  The magnitude is:

v = √(vx² + vy²)

v = √(37.5² + (-13)²)

v ≈ 39.7 m/s

if it is a displacement time graph, It will increase upwards in a straight line.

If it is a velocity time graph it will remain as a straight horizontal line

If it is an acceleration time graph there will be a horizontal straight line at 0

Answer:

[tex]\begin{array}{l|l}\text{Speed}\; \mathrm{(m\cdot s^{-1})} & \text{Minimum Height\;(m)}\\\cline{1-2}\\[-1em] 2 & 0.204\\3&0.459\\4 & 0.815\\5 & 1.27 \\6 & 1.83\end{array}[/tex].

Assumptions:

Explanation:

Consider the "SUVAT" equation

[tex]\displaystyle \frac{v^{2} - u^{2}}{2a} = x[/tex],

where

For example, if the bottle needs to achieve a speed of [tex]v = \rm 2\; m\cdot s^{-1}[/tex] by the time it reaches the ground,

Apply the previous equation to find the minimum height, [tex]x[/tex]:

[tex]\displaystyle x = \frac{v^{2} - u^{2}}{2a} = \rm \frac{\left(2\; m\cdot s^{-1}\right)^{2}}{2\times 9.81\; m\cdot s^{-2}} \approx 0.204\; m[/tex].

Replace the [tex]v[/tex] value and apply the formula to find the minimum height required to reach different final speeds.

Answer:

0.20

0.46

0.82

1.28

1.84

Explanation:

To achieve a speed of 2,3,4,5,6 m/s, the bottle must be

The frictional force between two sliding objects is given by:

F = μN

μ is the coefficient of kinetic friction, N is the normal force one object exerts on the other.

These are the two factors that influence the frictional force, the coefficient of friction and the normal force that the objects exert on each other.

The strength of the force of friction between two sliding objects is determined by the type of surfaces in contact and the normal force.

The strength of the force of friction between two sliding objects is determined by two factors:

For example, if two objects with rough surfaces are in contact and the normal force between them is large, the frictional force will be strong. Conversely, if the surfaces are smooth and the normal force is small, the frictional force will be weak.

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The term 'Theory' best describes the phrase as it refers to a well-substantiated explanation of some aspect of the natural world, that has been repeatedly tested and confirmed through the scientific method.

The term that best describes the phrase 'the best explanation that science has to offer' is Theory. In scientific terms, a 'theory' is more than just a guess. It is a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method, and repeatedly tested and confirmed through observation and experimentation.

Laws are generally observed patterns that apply universally. Experiments are practical procedures undertaken to derive or validate a fact, and Observation is the act of gathering and analyzing data. These are all integral components of scientific investigation, but the term 'theory' is the one that aligns most closely with 'the best explanation'.

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Answer: 0.4

Explanation:

the Answer is 0.4 which is c

This is kind of an awkward situation.

A, B, and C are definitely false:

A ... gasoline is not a renewable resource

B ... hydroelectric dams don't use wind for anything; windmills do

C ... fossil fuels are not renewable resources

So that leaves D, but D is partly absurd too.

Natural gas burning does not produce gases to turn the turbines.  Natural gas is burned to produce HEAT, just like on the stove in my kitchen.  The heat is used to boil water, and the steam from the boiling water is what turns the turbines to generate electrical energy.

But I guess you gotta pick  choice-D  as the answer.  

The answer is D. Natural gas can be burned, producing hot gases that turn turbines to generate electricity.

Answer:

A. both have critical mass

D. both use chain reactions

Apex.

Answer:

A & D

Explanation:

Answer:

C. when the distance between them becomes extremely large

Explanation:

The gravitational force between two masses is:

F = GMm / r²

where G is the universal constant of gravitation,

M and m are the masses of the objects,

and r is the distance between the objects.

As r grows very large, F grows very small.

Answer:

v

Explanation:

same

the size of image is the same with object in reflection

Answer: the size of the image will be the same as the object.

Explanation: image formed by plane mirror is:

1. Same size as the object

2. Laterally inverted

3. Form behind the mirror

4. Virtual

5. Same distance as the object from the mirror

Answer:

a. the brick's volume was 0.96 liters.

Explanation:

A brick is denser than water, so it sinks.  So the volume of water the brick displaces is equal to the brick's total volume.

Volume is a three-dimensional scalar quantity. The water displaced by the brick had a volume of 0.96 liters, which tells that the brick's volume was 0.96 liters. The correct option is A.

A volume is a scalar number that expresses the amount of three-dimensional space enclosed by a closed surface.

As it is known that volume occupies space, now, if the brick is put in water and it takes the place of water, therefore, the volume of the brick will be the same as the volume displaced by it.

Hence, The water displaced by the brick had a volume of 0.96 liters, which tells that the brick's volume was 0.96 liters.

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Answer:

3.33 km

Explanation:

Use the plane's height to find the time it takes for the bomb to land.

y = y₀ + v₀ t + ½ gt²

0 = 1960 + (0) t + ½ (-9.8) t²

t = 20

Now use the horizontal velocity to find the horizontal distance traveled.  But first, convert km/hr to m/s:

600 km/hr × (1000 m / km) × (1 hr / 3600 s) = 166.67 m/s

x = x₀ + v₀ t + ½ at²

x = 0 + (166.67) (20) + ½ (0) (20)²

x = 3333.33

The distance between A and B is 3.33 km.

Answer:

3.33 km

Explanation:

An aeroplane is flying at 1960m with velocity of 600km/hr and a bomb is dropped at some point A while it reaches at B.the distance between A and B is 3.33 km.

Answer:

D) all different and specific to each

Explanation:

I just finished the test.

Answer:

0 N, 3.49 m/s

Explanation:

Draw a free body diagram for the bucket at the top of the swing.  There are two forces acting on the bucket: weight and tension, both downwards.

If we take the sum of the forces in the radial direction, where towards the center is positive:

∑F = ma

W + T = m v² / r

The higher the velocity that Rony swings the bucket, the more tension there will be.  The slowest he can swing it is when the tension is 0.

W = m v² / r

mg = m v² / r

g = v² / r

v = √(gr)

Given that r = 1.24 m:

v = √(9.8 m/s² × 1.24 m)

v = 3.49 m/s

Answer:

Unknown

Explanation:

Because we cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the Universe in its totality is finite or infinite.

The given statement is true, that is, the universe is endless due to the fact that it is not limited with a specified boundary.

Explanation:

Universe has unimaginable length and width due to the limit of the present day science and technological adaptation because of which we haven’t explored the full universe yet. The world in which we live is the Earth which has been cartographed and studied well along with the Milky Way galaxies.  

But beyond this, there are thousands and millions of galaxies which has not been studied. Then there is a frame of reference of study with the dimensional frame where we have been adept to 3 dimensions only and the [tex]4^{th}[/tex] dimension is yet to be studied.

Answer:

C) 473 K

Explanation:

The conversion from Celsius to Kelvin is:

K = C + 273.15

So if the temperature is 200 °C:

K = 200 + 273.15

K = 473.15

Which is approximately answer C.

The absolute temperature corresponding to 200°C is 473 K. This is calculated by adding 273.15 to the Celsius (in accordance to the Celsius-Kelvin conversion formula) and rounding to the nearest whole number.

The absolute temperature measurement is typically done in Kelvin (K), which is the temperature scale used in science because it is an absolute temperature scale. Zero degrees on the Kelvin scale, known as absolute zero, is theoretically the point at which molecular motion ceases, producing no thermal energy. A useful thing about the Kelvin scale is that it corresponds directly with the Celsius temperature scale, with a linear shift of 273.15 degrees. In other words, if you want to convert from Celsius to Kelvin, you simply add 273.15 to the Celsius temperature.

In the case of the given temperature of 200 degrees Celsius, the conversion to Kelvin would be 200 + 273.15 = 473.15 K.

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Answer:

C. 27.5 N

Explanation:

F = ma is the equation given to you, in which:

F = force

m = mass = 3.4 kg

a = acceleration = 8.1 m/s

Plug in the corresponding numbers to the corresponding variables:

F = (3.4)(8.1)

F = 27.54

C. 27.5 N is your closest answer when rounded to the nearest tenths.

~

Answer:

C. 27.5 N

Explanation:

The force on an  object that has a mass of 3.4 kg and an acceleration of 8.1 m/s is 27.5 N.

F = (3.4)(8.1)

F = 27.54

Answer:

a) 6.46 s

b) 73.0 m

c) 22.6 m/s, 26.7 m/s

Explanation:

The position can be found with constant acceleration equation:

x = x₀ + v₀ t + ½ at²

where x is the final position,

x₀ is the initial position,

v₀ is the initial velocity,

a is the acceleration,

and t is the time.

For John:

x₀ = 0 m

v₀ = 0 m/s

a = 3.50 m/s²

For Peter:

x₀ = 0 m

v₀ = 0 m/s

a = 4.90 m/s²

John's position at time t is:

x = 0 + (0) t + ½ (3.50) t²

x = 1.75 t²

Peter starts 1 second after John.  Peter's position at time t−1 is:

x = 0 + (0) (t−1) + ½ (4.90) (t−1)²

x = 2.45 (t−1)²

When Peter overtakes John, they have the same position:

1.75 t² = 2.45 (t−1)²

1.75 t² = 2.45 (t² − 2t + 1)

1.75 t² = 2.45 t² − 4.90 t + 2.45

0 = 0.70 t² − 4.90 t + 2.45

0 = 2 t² − 14 t + 7

t = [ 14 ± √(169 − 4(2)(7)) ] / 4

t = 0.54, 6.46

Since t > 1, Peter overtakes John 6.46 seconds after the race starts, which means he drives for 5.46 seconds.

The distance Peter travels is:

x = 2.45 (6.46 − 1)²

x = 73.0

Peter travels 73.0 meters.

The speed that John reaches is:

v = (3.50 m/s²) (6.46 s)

v = 22.6 m/s

The speed that Peter reaches is:

v = (4.90 m/s²) (5.46 s)

v = 26.7 m/s

Peter takes 5 seconds to overtake John, travels a distance of 61.25 meters before he catches up, and they have speeds of 24.5 m/s and 21.0 m/s, respectively, at the instant Peter overtakes John.

To solve this physics problem, we use the equations of motion to determine the time it takes for Peter to overtake John, the distance Peter travels before he catches John, and the speeds of both cars at the instant Peter overtakes John. Since both Peter and John start from rest, their initial velocities (v0) are 0 m/s. Peter accelerates at 4.90 m/s2, while John accelerates at 3.50 m/s2. John starts 1 second before Peter.

Solution:

Therefore, Peter takes 5 seconds to overtake John, travels a distance of 61.25 meters before he catches up, and they have speeds of 24.5 m/s and 21.0 m/s, respectively, at the instant Peter overtakes John.

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Answer:

83%

Explanation:

On the surface, the weight is:

W = GMm / R²

where G is the gravitational constant, M is the mass of the Earth, m is the mass of the shuttle, and R is the radius of the Earth.

In orbit, the weight is:

w = GMm / (R+h)²

where h is the height of the shuttle above the surface of the Earth.

The ratio is:

w/W = R² / (R+h)²

w/W = (R / (R+h))²

Given that R = 6.4×10⁶ m and h = 6.3×10⁵ m:

w/W = (6.4×10⁶ / 7.03×10⁶)²

w/W = 0.83

The shuttle in orbit retains 83% of its weight on Earth.

The correct option is c) 83%.

Given :

A shuttle on Earth has a mass of [tex]4.5\times 10^5[/tex] kg.

Shuttle is at height of [tex]6.3\times 10^5[/tex] meters above the surface of the Earth.

Solution :

On the surface of Earth, the weight is

[tex]\rm W = \dfrac{GMm}{R^2}[/tex]  ---- (1)

Where,

G is the gravitational constant,

M is the mass of the Earth,

m is the mass of the shuttle,

R is the radius of the Earth.

In orbit the weight is,

[tex]\rm w = \dfrac{GMm}{(R+h)^2}[/tex]  ----- (2)

Now we take the ratio of equation (2) to (1),

[tex]\rm \dfrac{w}{W}= \dfrac{R^2}{(R+h)^2}[/tex]   ----- (3)

Now put the values of R and h in equation (3) we get,

[tex]\rm \dfrac{w}{W} = 0.83[/tex]

= 83%

Therefore, the correct option is c) 83%

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Answer: B

Explanation:

Answer:B

Explanation:

Answer:

Zero

Explanation:

The work done by a force on an object is given by:

[tex]W=Fd cos \theta[/tex]

where

F is the magnitude of the force

d is the displacement of the object

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

In this situation, the force is the force of gravity acting on the satellite. This force always points towards the centre of the trajectory, so it is always perpendicular to the direction of motion of the satellite (since the orbit is circular), so [tex]\theta=90^{\circ}[/tex] and [tex]cos \theta =0[/tex]. Therefore, the work done by gravity is also zero.

Answer:

zero

Explanation:

on edg.

Answer:

10.125

Explanation:

Answer:

4.5 m/s

Explanation:

Kinetic energy is:

KE = ½ mv²

where m is mass and v is velocity.

Given KE = 810 J and m = 80 kg:

810 J = ½ (80 kg) v²

v = 4.5 m/s

An emitter allows things to pass through a surface from inside to outside.

An absorber allows something to pass through it from the outside to the inside.

Answer/Explanation:

Shiny surfaces are poor absorbers and emitters (but they are good reflectors of infrared radiation). If two objects made from the same material have identical volumes, a thin, flat object will radiate heat energy faster than a fat object. This is one reason why domestic radiators are thin and flat.

Answer:NO

Explanation:

No, because as it swings it is mechanical energy that changes from almost completely potential energy to almost completely kinetic energy and thermal and sound.

Answer:

c. the volume of the part of the ship that lies below the water's surface.

Explanation:

As stated in the problem, Archimedes' Principle tells us that that buoyant force on an object is equal to the weight of fluid it displaces.  The volume of water that a ship displaces is the volume it occupies below the surface.

Answer:

the answer is c

Explanation:

mechanical waves must travel through a medium but electromagnetic waves do not have to

Answer:

Frequency of orange light = [tex]5 \times 10^{14}[/tex] Hz

Explanation:

We are given the wavelength of the orange light and we are to find the value of its frequency.

Wavelength of orange light = [tex]6.0 \times 10^{-7} m[/tex]

We know that:

Speed of light = Frequency of orange light × Wavelength of orange light

Substituting the values in the above formula:

[tex]3 \times 10^8[/tex] = Frequency of orange light × [tex]6.0\times10^{-7}[/tex]

Frequency of orange light = [tex]\frac{3 \times 10^8}{6\times10^{-7}} =5 \times 10^{14}[/tex] Hz

False. Acceleration is not the magnitude of average velocity.

Acceleration  is the rate at which an object's velocity changes over time. It is a vector quantity and is defined as the change in velocity divided by the change in time.

Mathematically the formula for acceleration is given as;

a = Δv / Δt

where;

Average velocity, on the other hand, is the displacement of an object divided by the time taken. It is also a vector quantity and is defined as the change in position divided by the change in time.

Thus, we can conclude that acceleration is not the magnitude of average velocity.

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The complete question is below:

Acceleration is the magnitude of average velocity.​ True/False?

Acceleration is not the magnitude of average velocity but is the rate at which velocity changes in terms of magnitude or direction. Calculated by dividing the change in velocity by the time interval, it is a vector with its own SI unit of m/s². Average acceleration differs from instantaneous acceleration and can be positive, negative, or zero.

The statement 'Acceleration is the magnitude of average velocity' is incorrect. Instead, acceleration is defined as a change in velocity, which can be in terms of magnitude or direction, or both. When you have a change in velocity (∆v) over a time interval (∆t), the average acceleration (αavg) is calculated. This is expressed as α = ∆v/∆t. The SI units for acceleration are meters per second squared (m/s²).

Acceleration is always a vector, meaning it has both magnitude and direction. It is important to note that acceleration does not just involve an increase in speed; it includes any change in velocity, including reduction in speed (deceleration) and changes in direction. Average acceleration differs from instantaneous acceleration, which is the rate of change of velocity at a specific point in time. To understand average acceleration, one should consider the total change in velocity and the total time over which this change occurred, without needing to know every single instantaneous rate of change.

Answer:

B. The atom gains 1 electron, to make a total of 18 electrons.

Explanation:

Chlorine is the 17th element in the periodic table, so it has atomic number 17:

Z = 17

This means that a neutral atom of chlorine has 17 protons and 17 electrons.

When a chlorine atom gains 1 electron, its electric charge (initially zero) becomes -1, since the electron has negative charge of -1 (in elemntary charge units). This also means that the number of electrons in the ion is now

17 + 1 = 18

So the correct answer is

B. The atom gains 1 electron, to make a total of 18 electrons