At what vertical velocity should no object be launched at in order to achieve a height of 20m?​

Answer: 450 kg

Explanation: p=mv

m= p/v

m=40500/90

m=450kg

The mass of the truck given that it has a momentum of 40500 Kgm/s and moving at 90 m/s is 450 Kg

Momentum is defined as the product of mass and velocity. It is expressed as

Momentum = mass × velocity

Momentum = mass × velocity

40500 = mass × 90

Divide both side by 90

Mass = 40500 / 90

Mass = 450 Kg

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Answer:

V= 250 volts

Explanation:

V=IR

V=25*10

V=250 volts

Answer: 250 V

Explanation: Ohm's Law is expressed in the given equation:

V = I x R

Substitute the values of I ( current) and R ( resistance)

V = 25 A x 10 ohms

= 250 V

Explanation:

Energy

It is ability to do work

It is of different types out of which mechanical energy is also one of the type .

Mechanical energy

It is the energy possessed by body due to its position or motion .

It is of two types :

Kinetic energy

Potential energy

Potential energy

It is the energy possessed by body due to its position or state .

It is given by P.E =mx gx h

Kinetic energy

It is the energy possessed by body due to its motion .

It is given by K.E=1/2 mv²

Law of conservation of energy

It states that energy can be converted from one form to another but total energy of the system remains same .

That is why : in above asked question ,when body is moving it has kinetic energy , when stops the kinetic energy gets converted to potential energy , but the total energy of system remains same .

The object's kinetic energy would decrease, its potential energy would increase, and its total mechanical energy would remain the same.

The total mechanical energy (E) of a system is the sum of its kinetic energy (KE) and its potential energy (PE).

E = KE+ PE

conservation of energy:

whenever an object is acted upon by a non-dissipative conservative force its total mechanical energy remains conserved.

So, when the object slows down, its velocity decreases, and therefore its kinetic energy decreases. Since the total mechanical energy remains conserved, the loss in kinetic energy is converted into gain in potential energy, and the potential energy increases.

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Density = mass/volume

Density = 340.6kg / 214 cm^3

Density = 1.592 kg/ cm^3

Density = 1,592 gram/cm^3

That's about 70 TIMES the density of the most dense natural element (Osmium). This is one verrrry interesting rock !

According to the question,

We know the formula,

→ [tex]Density = \frac{Mass}{Volume}[/tex]

By substituting the values, we get

                 [tex]= \frac{340.6}{214}[/tex]

                 [tex]= 1.592 \ kg/cm^3[/tex]

or,

                 [tex]= 1592 \ g/cm^3[/tex]

Thus the response above is correct.

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Answer:

Acceleration

Explanation:

can you mark me  brainlies

So, if an object travels in a curved path, it changes velocity, and, thus, accelerates. This acceleration must be tied to a force. ... Therefore, whenever an object travels in a curved path, there must be an unbalanced force acting upon it. It is important to understand that all this may occur without a change in speed.t

Answer:

What is a Pure Substance?

Explanation:

It is something which cannot be divided into parts by physical means, as it's all made up of the same thing. Pure substances are either elements or compounds. Elements can NOT be separated into other types of matter (physically or chemically).

Answer:

an element

Explanation:

Elements are not able to be separated, but everything else can, whether that be physically or chemically.

Not my work i looked it up, so no copy write please rate!

Answer:

False

Explanation:

A book resting on a shelf has no potential energy relative to the shelf, since it has height of zero meters relative to the shelf.

Answer:

True

Explanation:

a) Potential difference needed: 10,000 V

b) Because the potential difference in the house is maximum 230 V

Explanation:

a)

The relationship between current, potential difference and resistance in a conductor is given by Ohm's law:

[tex]V=RI[/tex]

where

V is the potential difference

R is the resistance

I is the current

The resistance of the human body is estimated to be as high as [tex]100,000 \Omega[/tex] for a dry body and as low as [tex]1000 \Omega[/tex] for a wet body: in this problem, we use a value in the middle,

[tex]R=10,000 \Omega[/tex]

Therefore, the potential difference needed to produce a current of

[tex]I=1 A[/tex]

is

[tex]V=(10,000)(1)=10,000 V[/tex]

b)

Here we want to estimate if it is likely or not to get injured by an electric current in a house.

The amount of current that can be fatal is [tex]I=1 A[/tex]. From part a), we saw that in order to produce this current through the human body, a potential difference of

[tex]V=10,000 V[/tex]

is needed.

However, the electricity that reaches the houses and then is connected to the household appliances has a potential difference of

V = 230 V

This value is much lower than 10,000 V, therefore the electricity in the house is unlikely to cause injures to human body.

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The velocity of the ball is zero at the point of release.

Thus the ball have the least kinetic energy just after it is released.

The energy of the object due to its motion is known as the kinetic energy of that object.

As the ball has some height before it is dropped.

Due to this height the ball posse some potential energy which is equal to the product of its mass, height and the gravitational force.Here kinetic energy is zero.

Hence the ball have the least kinetic energy just after it is released.

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Answer: After it has hit the ground

Explanation:

I took the K12 test and got it right leave brainliest

Answer:

TRUE

Explanation:

Answer: TRUE

Explanation:

A) Acceleration in part A: [tex]6.1 m/s^2[/tex]

B) Acceleration in part B: [tex]2.7 m/s^2[/tex]

C) Acceleration in part C: [tex]1.5 m/s^2[/tex]

Explanation:

A)

The picture of the problem is missing: find it in attachment.

The acceleration of a body is equal to the rate of change of its velocity:

[tex]a=\frac{v-u}{\Delta t}[/tex]

where

v is the final velocity

u is the initial velocity

[tex]\Delta t[/tex] is the time it takes for the velocity to change from u to v

In part A of the race, we have:

u = 0

v = 5.5 m/s (estimate)

[tex]\Delta t = 0.9 - 0 = 0.9 s[/tex]

So the acceleration is

[tex]a=\frac{5.5-0}{0.9}=6.1 m/s^2[/tex]

B)

In part B of the race, we have:

u = 5.5 m/s is the initial velocity (estimate)

v = 9.5 m/s is the final velocity (estimate)

[tex]\Delta t = 2.4 - 0.9 = 1.5 s[/tex] is the time interval between the two points considered

Therefore, using the equation for the acceleration, we can find the acceleration in part B:

[tex]a=\frac{9.5-5.5}{1.5}=2.7 m/s^2[/tex]

C)

In part C of the race, we have:

u = 9.5 m/s is the initial velocity (estimate)

v = 11 m/s is the final velocity (estimate)

[tex]\Delta t = 3.4 - 2.4 = 1 s[/tex] is the time interval between the two points considered

And therefore, the acceleration in part C of the race is:

[tex]a=\frac{11-9.5}{1}=1.5 m/s^2[/tex]

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a) Distance moved by the top lid during a blink: 1 cm (estimate)

b) The acceleration is [tex]34.7 m/s^2[/tex]

c) The final speed is 0.83 m/s

Explanation:

a)

For the purpose of this problem, we can estimate the size of the eye from the top lid to the bottom lid to be 1 cm, so this is the distance moved by the top lid during a blink.

b)

Assuming the motion of the eyelid to be at constant acceleration, we can find the acceleration by using the following suvat equation:

[tex]s=ut+\frac{1}{2}at^2[/tex]

where

s is the distance covered

u is the initial velocity

t is the time

a is the acceleration

For the eyelid, we have:

u = 0 (it starts from rest)

s = 1 cm = 0.01 m is the distance covered

t = 0.024 s is the time taken

Solving for a, we find the acceleration:

[tex]a=\frac{2s}{t^2}=\frac{2(0.01)}{0.024^2}=34.7 m/s^2[/tex]

c)

The final speed of the upper eyelid can be found by using another suvat equation:

[tex]v=u+at[/tex]

where

v is the final speed

u is the initial speed

a is the acceleration

t is the time

For the eyelid in this problem, we have

u = 0

[tex]a=34.7 m/s^2[/tex]

t = 0.024 s

Substituting, we find the final speed:

[tex]v=0+(34.7)(0.024)=0.83 m/s[/tex]

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Answer:

Statics which is when dealing with forces acting out on body and the possible motives of the body system. Kinetics which explains the motion that can occur in any type of situation.

Explanation:

Answer:

Athsma. Pneumonia is the only other one it could be, but is not brought on the excercise, allergy, stress.

Explanation:

Hope this helps! Happy Trails!

Answer:

b

Explanation:

The main idea can be the Role of Heat Transfer Methods in the Distribution of Earth's Energy.

The main idea of a passage is the central message or information the author is trying to pass to the audience.

The main idea of a passage is the author's main purpose of writing the passage.

From the given options, the main idea of the passage can be determined if the central message of the passage can be deduced.

The main idea can be "The Role of Heat Transfer Methods in the Distribution of Earth's Energy"

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Liquids and gases are a part of fluids.

Explanation

Liquids and gases are two states of matter and they differ from solids in terms of close packing of the particles and freedom of movement. The solid particles are closely packed allowing lesser freedom  of movement while the particles are not the tightly packed in liquids and gases. gases have greater freedom of movement than solids and liquids and liquids have greater freedom of movement than solids.

Due to this factor liquids and gases can  move or flow easily and that is why they are called fluids.

Answer:

1500 m/s

Explanation:

The sound wave travels 750 meters from the ship to the bottom of the water, then 750 meters back to the ship.  So it travels a total distance of 1500 meters in 1 second.

So the average speed is:

v = 1500 m / 1 s

v = 1500 m/s

Answer:

25 m/s

Explanation:

Impulse = change in momentum

F Δt = m Δv

(3750 N) (0.5 s) = (75 kg) (v − 0 m/s)

v = 25 m/s

Answer:

it's 578 cm

[tex]\pi \times 8 \times 15 + \pi \times {8 }^{2} = 578[/tex]

Explanation:

[tex]surface \: area \: of \: a \: corn = \pi \times radius \times slant \: height + \pi \times {r}^{2} [/tex]

Final answer:

The incorrect statement about the nuclear strong force is that it is responsible for the sun's nuclear fission reactions. In reality, the strong force is crucial for binding nucleons within nuclei and operates over extremely short distances, but it is not responsible for fission in the sun.

Explanation:

The statement about the nuclear strong force that is not true is: The nuclear strong force is responsible for the sun’s nuclear fission reactions. This is incorrect because the strong force is not responsible for fission in the sun; instead, it plays a crucial role in maintaining the stability of atomic nuclei by binding protons and neutrons together. It is a powerful attractive force that acts over extremely short distances, approximately 10-15 meters, and is much stronger than electrostatic repulsions between similarly charged protons. However, its primary role is not in driving the sun's fission reactions, but in the fusion processes that occur in stars, including our sun.

The correct statements regarding the nuclear strong force are:

Answer:

1.53 m/s

Explanation:

Given:

Mass of the car (M) = 1300 kg

Mass of the coal (m) = 400 kg

Initial velocity of the car (U) = 2 m/s

Initial velocity of the coal (u) = 0 m/s (Since it is dropped)

When the coal is dropped into the car, then they move with same final velocity.

Let the final velocity be 'v' m/s.

For a closed system, the law of conservation of momentum holds true.

So, initial momentum is equal to final momentum of the car-coal system.

Initial momentum of the car = [tex]MU=1300\times 2=2600\ Ns[/tex]

Initial momentum of the coal = [tex]mu=0\ Ns[/tex]

Total initial momentum is the sum of the above two momentums.

So, total initial momentum = 2600 + 0 = 2600 Ns

Now, final momentum is given as the product of combined mass and final velocity. So,

Final momentum of the system = [tex](M+m)v=(1300+400)v=1700v[/tex]

Now, from law of conservation of momentum,

Initial momentum = Final momentum

[tex]2600=1700v\\\\v=\frac{2600}{1700}\\\\v=1.53\ m/s[/tex]

Therefore, the final velocity of either of the two masses is same is equal to 1.53 m/s.

To find the final velocity of the car after the coal is dropped, we can use the principle of conservation of momentum.

To solve this problem, we can use the principle of conservation of momentum. The momentum before the coal is dropped vertically into the car is given by the product of the mass and velocity of the car, which is 1,300 kg×2.0 m/s = 2,600 kg×m/s. After the coal is dropped, the total momentum of the system should remain the same since there is no external force acting on it. Therefore, the final velocity of the car can be calculated by dividing the total momentum by the new total mass of the car and coal, which is 1,300 kg + 400 kg = 1,700 kg.

Using the equation:

(initial momentum) = (final momentum)

(1,300 kg × 2.0 m/s) = (1,700 kg × v)

Solving for v, we find that the final velocity of the car after the coal is dropped is approximately 1.529 m/s.

Answer:

Explanation:

The equation or formula for velocity is similar to speed. To figure out velocity, you divide the distance by the time it takes to travel that same distance, then you add your direction to it.

Final answer:

To calculate final velocity, identify the knowns (initial velocity, acceleration, time), determine the unknown (final velocity), use the equation v = vo + at, and solve by substituting values into the equation.

Explanation:

To find the final velocity of an object, you must first:

Identify the known values, such as initial velocity (vo), acceleration (a), and time (t).

Determine the unknown, which is the final velocity (v).

Select the appropriate equation to calculate final velocity. The standard equation used is v = vo + at.

Substitute the known values into the equation and solve for the final velocity.

For example, if the initial velocity is 70.0 m/s, the acceleration is -1.50 m/s², and the time is 40.0 s, you would calculate the final velocity as follows:

v = vo + at = 70.0 m/s + (-1.50 m/s²) (40.0 s) = 10.0 m/s

This calculation reveals that the final velocity of the object after 40 seconds is 10.0 m/s.

The distance covered is 0.98 m

Explanation:

Newton's second law states that the force applied on the gymnast is equal to the product between its mass and its acceleration:

[tex]F=ma[/tex]

where in this case,

F = -1000 N is the force applied (negative since it is opposite to the direction of motion)

m = 40 kg is the mass

a is the acceleration

Solving for a,

[tex]a=\frac{F}{m}=\frac{-1000}{40}=-25 m/s^2[/tex]

Since the motion of the gymnast is a uniformly accelerated motion, we can now apply suvat equations:

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

where

v = 0 is the final velocity of the gymnast

u = 7 m/s is the initial velocity

[tex]a=-25 m/s^2[/tex] is the acceleration

s is the distance through which the gymnast moves before stopping

And solving  for s,

[tex]s=\frac{v^2-u^2}{2a}=\frac{0-7^2}{2(-25)}=0.98 m[/tex]

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Using the principles of work and kinetic energy, we can calculate that the gymnast will sink 0.98 meters into the foam pit before coming to a stop.

In this physics problem, we are dealing with the principles of work and kinetic energy. The work done to stop the gymnast can be calculated using the formula W=Fxd, where F is the resistive force, and d is the distance. It’s also equal to the change in kinetic energy, which can be found using KE = 0.5mv^2.

To calculate the distance into the pit the gymnast will sink, we first calculate her initial kinetic energy. It’s KE = 0.5*(40 kg)*(7 m/s)^2 = 980 Joules. The work done to stop her (which is equal to her initial kinetic energy) is W = 980 Joules. Now, solve the work equation for distance: d = W/F = 980 Joules / 1000 N = 0.98 m. So, the gymnast will sink 0.98 meters into the foam pit before she stops.

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Answer: v = 96.5 km/h

Explanation: Solve this problem using the following equation:

v= d/t

First convert t in minutes into hours

34 mins x 1 hour / 60 mins

= 0.57 h

Substitute the values

v = 55 km / 0.57 h

= 96.5 km/h

Answer:

1.8 L

Explanation:

Ideal gas law:

PV = nRT

where P is absolute pressure,

V is volume,

n is number of moles,

R is the gas constant,

and T is absolute temperature.

Rearranging:

V / T = nR / P

Since n, R, and P are constant:

V₁ / T₁ = V₂ / T₂

1.5 L / (298.15 K) = V / (363.15 K)

V = 1.8 L

Charles's Law is used to find the new volume of a balloon when heated from 25°C to 90°C. Converting these temperatures to Kelvin and solving gives a new volume of 1.83 L.

The question involves understanding how the volume of a gas changes with temperature, governed by Charles's Law, which states that the volume of a gas at constant pressure is directly proportional to its temperature in Kelvin. To find the new volume of a balloon when its temperature is increased from 25°C to 90°C, we first convert these temperatures to Kelvin (°K) because the gas law uses absolute temperatures. The formula to convert Celsius to Kelvin is K = °C + 273.15. Thus, the original temperature is 298.15 K (25 + 273.15), and the new temperature is 363.15 K (90 + 273.15).

Using Charles's Law (V1/T1 = V2/T2), where V1 is the original volume (1.5 L), T1 is the original temperature (298.15 K), V2 is the final volume, and T2 is the final temperature (363.15 K), we can solve for V2. Rearranging the formula gives us V2 = V1 * (T2/T1).

Substituting the given values, V2 = 1.5 L * (363.15 K / 298.15 K) = 1.5 L * (1.218) = 1.83 L. Therefore, the volume of the balloon when placed in a container of hot water at 90°C would be 1.83 L.

Answer:

b

Explanation:

its b

As per the image depicted the picture shows us the arrow and the target to be hit.

Hence the option B is correct.

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The answer from the given option is The mean study time of students in class B is less than the students in class A.

Explanation:

There are three types of mean:

Here in class A,  

  Mean in class A = (2+5+7+6+4+3+8+7+4+5+7+6+3+5+4+2+4+6+3+5) / 20

                                = 4.8.

  Mean in class B = (3+7+6+4+3+2+4+5+6+7+2+2+2+3+4+5+2+2+5+6) / 20

                                = 4.

Hence mean study time of class B is less than the mean study time of class A.