2. A 50.0 kg shell was fired from a cannon at earth's surface to a
maximum height of 400. m.
a. What is the potential energy at maximum height?
b. It then fell to a height of 100. m. What was the loss of PE as
it fell?

Answer:

27J  

3528J

Explanation:

First problem:

Given parameters:

Mass of tennis ball  = 0.06kg

Velocity of tennis ball  = 30m/s

Unknown:

Kinetic energy  = ?

Solution:

Kinetic energy is the energy due to the motion of a body.

It is expressed as:

       K.E  = [tex]\frac{1}{2}[/tex] m v²  

       K.E =  [tex]\frac{1}{2}[/tex]  x 0.06 x 30²   = 27J  

Second problem:

Given parameters:

Mass = 30kg

Height  = 12m

Unknown:

Potential energy  = ?

Solution:

Potential energy is the energy due to the position of a body.

  Mathematically;

       Potential energy  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now;

          Potential energy  = 30 x 9.8 x 12  = 3528J

Answer:

I think kilogram.

Explanation:

If you refer to science book you can find.

Answer:

Same reading.

Explanation:

Assume that after the string breaks the ball falls through the liquid with constant speed. If the mass of the bucket and the liquid is 1.20 kg, and the mass of the ball is 0.150 kg,

A.) Before the string break, the total weight = weight of the can + weight of the water.

According to Archimedes' Principle which state that: “A body immersed in a liquid loses weight by an amount equal to the weight of the liquid displaced.” Archimedes principle also states that: “When a body is immersed in a liquid, an upward thrust, equal to the weight of the liquid displaced, acts on it

B.) After the string break.

The scale will have the same reading as before the string break.

Answer:

Explanation:

Convex lens refers to the lens which merges the light rays at a particular point, that travels through it.

Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses.

Answer:

64.5

Explanation:

(m1 + m2) v initial = (m1 * v1 final) + (m2 * v2 final)

(92 + 8)(-7) = (92 x 2) + (8 x v2 final)

(100)(-7) = (184) + (8 x v2 final)

-700 = (184) +  (8 x v2 final)

-516 =  (8 x v2 final)

-516/8 = v2 final

-64.5 = v2 final

Answer:

Gravity

Explanation:

When the ball is falling to the ground, there is only one force- gravity. In some cases, there may be air resistance, but that seems to be neglected here.

Normal force:

Cannot be included. Normal force is only applicable when object is on a surface, and it acts perpendicular to the surface. Since the ball is falling, there is no surface, and therefore no normal force. This question gives you unnecessary information, designed to trick you. Please remember when normal force is applicable.

Friction force:

Also only applicable when object is moving, and is on the table. Friction only applies when there is an applied force. There is no applied force when the ball is falling, so therefore no friction force.

Force of fall:

First of all, what is this? There is nothing called force of fall.

Gravity:

This is the only one that applies. Just draw a vector arrow from the bottom of the ball and label it mg (acceleration due to gravity).

Answer:

The final speed of the arrow when it hits the target is 45.63 m/s.

Explanation:

Given;

spring constant of the bow, k = 458 N/m

extension of the bow, x = 0.72 m

mass of the arrow, m = 0.0925 kg

let the initial speed of the arrow after being fired = u

Apply the law of conservation of energy, the elastic potential energy of the bow will be converted to kinetic energy of the arrow.

[tex]\frac{1}{2} kx^2 = \frac{1}{2} mu^2\\\\kx^2 = mu^2\\\\u^2 = \frac{kx^2}{m} \\\\u= \sqrt{\frac{kx^2}{m} } \\\\u = 50.66 \ m/s[/tex]

The speed of the arrow when it hits a target 24.7 m above the ground is calculated as;

v² = u² + 2gs

where;

v is the final speed when the arrow hits the target

g is acceleration due to gravity = (-9.8 m/s², upward motion)

v² = 50.66² + 2(-9.8)24.7

v² = 2566.44 - 484.12

v² = 2082.32

v = √2082.32

v = 45.63 m/s

Therefore, the final speed of the arrow when it hits the target is 45.63 m/s.

Answer:

The momentum and the kinetic energy remains constant.

Explanation:

A uniform circular motion is defined as the motion of a body which moves in a constant speed or at the same speed during the motion.

In the context, it is given that a satellite is moving around the earth in a circular orbit at a constant speed. The satellite has certain momentum as well as energy.

We can conclude that the kinetic energy and the momentum of the satellite remains constant as the momentum and kinetic energy depends on the speed of an object And here the speed of the satellite is constant, so the moment as well as the kinetic energy of the satellite remains constant while moving in a circular path.

Answer:

Hey mate I shall not tell you the answer I shall explain it to you after this if still you can't understand then say

Explanation:

Derive v = u + at by Graphical Method. Consider the velocity – time graph of a body shown in the below Figure

Derive s = ut + (1/2) at2 by Graphical Method. Velocity so time graph to derive the equations of motion.

Derive v2 = u2 + 2as by Graphical Method. Velocity–Time graph to derive the equations of motion.

I hope you understand now

enjoy your day

#Captainpower :)❤❤

Answer:

A increases

Explanation:

#CarryOnLearning

B) The gravitational force exerted from the planet on Moon A is eight times larger than the gravitational force exerted from the planet on Moon B

Answer:

B. Solid rock breaks apart.

Explanation:

Answer:

B

Explanation:

I did it on a test lol

They undergo internal fertilization. They lose their tails as adults. They have wet, moist skin. They have long, strong legs. They begin life with gills.

Answer:

fluids

Explanation:

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

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Answer:

a = 0.8 [m/s²]

Explanation:

To solve this problem we must use Newton's second law which tells us that the resulting force on a body is equal to the product of mass by acceleration, in this way we come to the following equation:

∑F = m*a

where:

F = forces applied [N]

m = mass = 1000 [kg]

a = acceleration [m/s²]

Now using Newton's second law.

[tex]1200 - 400 = 1000*a\\800 = 1000 *a\\a=0.8[m/s^{2} ][/tex]

Answer:

270Joues

Explanation:

Step one:

given data

Force F= 45N

distance moved d= 6m

Required

The work done in moving the block 6m

Step two:

We know that the expression for the work done is

WD= force* distance

WD= 45*6

WD=270Joues

Explanation:

A box that is pulled by 2 forces:

50N - 10N = 40N.

Since the force acting towards the right is stronger, there is a net force of 40N to the right and the box will move towards the right (if it has low static friction coefficient)

The answer is 40N to the right.

We have that for the Question "What is the net force acting on a box that is being pulled to the right with a 50 N force and to the left with a 10 N force? _________ to the _______" it can be said that The appropriate statement is

From the question we are told

What is the net force acting on a box that is being pulled to the right with a 50 N force and to the left with a 10 N force? _________ to the _______

Generally the equation for the Net force  is mathematically given as

Fn=F_2-F_1

Therefore

Fn=F_2-F_1

Fn=50-10

Fn=40N

Therefore

The appropriate statement is

The net Force is 40N to the right

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Answer:

so it would be 60N divide by 30kg which gives you 20m/s²

Explanation:

Acceleration will increase bc acceleration is the change in speed and direction so if you increase the force it is most to to faster

Answer:

False

Explanation:

Vector has a magnitude and direction.

A scalar is just a magnitude or size.

The answer is false.

Scalar quantity:

        Speed, Mass, length, distance, power, energy, work.

Vector quantity:

Hence, Option B is the correct answer.

Learn more about the scalar and vector quantities,

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#SPJ5

Answer:

Explanation:

let's find the acceleration

[tex]v = u + at \\ 8 = 0 \times a \times 2.5 \\ \alpha = 3.2m {s}^{ - 2} [/tex]

then distance

[tex] {v}^{2} = {u}^{2} + 2as \\ {8}^{2} = 2 \times 3.2 \times s \\ \\ s = 10m [/tex]

Answer: 0.164

Explanation:

the coefficient for ethyl alcohol b is 1120x10^-6

so (0.00823)/ (1120x10^-6)(44.8) gives you your answer: 0.164

Answer:

Explanation:  

When objects collide, energy can be transferred from one object to another, thereby changing their motion. In such collisions, some energy is typically also transferred to the surrounding air; as a result, the air gets heated and sound is produced.

Given that,

Combined weight of a student and the waxed skis, W = 850 N

It should be given that the coefficient of friction is 0.05.

To find,

The magnitude of the normal force exerted and the magnitude of the force of friction.

Solution,

Normal force = weight of the object,

Here, weight = 850 N

Normal force = 850 N

Let f is the force of friction. It can be calculated as follows :

[tex]f=\mu N\\\\=0.05\times 850\\\\=42.5\ N[/tex]

Hence, the normal force is 850 N and the magnitude of the force of friction is 850 N.

Answer: 43

Explanation:

Answer:

constant volicty of the pumper when they hit ground 7.03-/s

Answer:

The positive end of battery 1 touching the negative end of battery 2 and wires connecting the negative of battery 1 to the light light bulb and the positive of battery 2 to the light bulb.

Explanation:

Answer:

In much the same way, a mechanical wave can carry energy through a medium without moving matter through the medium. ... Because the particles in a solid are tightly packed together, sound waves can quickly transfer energy from particle to particle in a solid.

Answer:

Its vertical speed increases, and its horizontal speed remains the same.

Explanation:

Given that,

A baseball player throws a ball horizontally,

We know that,

A baseball player throws a ball horizontally, then vertical component of gravity will be increases but there is no acceleration in horizontal direction

So, horizontal velocity remains same.

Hence, Its vertical speed increases, and its horizontal speed remains the same.

If a baseball player throws a ball horizontally, the statement which best  describes the ball's motion after it is thrown is: B. Its vertical speed increases, and its horizontal speed remains the same.

Speed can be defined as the distance covered by an object per unit time.

Generally, speed has magnitude but no direction and as such it is a scalar quantity.

Mathematically, speed is given by the formula;

[tex]Speed = \frac{distance}{time}[/tex]

For the vertical component of speed:

The vertical speed of an object increases with respect to the distance covered by the object as a result of the effect of acceleration due to gravity.

For the horizontal component of speed:

The horizontal speed of an object remains the same with respect to the distance covered by the object because there isn't any gravitational force acting on it.

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