a 28 kg ball is rolling across the top of a 0.75 m tall table. the ball has 350 J of kinetic energy. how fast is the ball moving

Answer:

Explanation:

If a cat walk 100m East, this means that it is walking in the positive x direction, the distance will therefore be +100m

If it turns around and walks 25 m west, the direction of movement is in the negative x direction i.e -25m

Taking the sum;

Displacement = +100m - 25m

Displacement of the cat = 75m

hence the cats displacement is 75m

M = mass of the ball A = 5.0 kg

m = mass of the ball B = ?

V = initial velocity of the ball A before collision = 20 m/s

v = initial velocity of the ball B  before collision = 10 m/s

V' = final velocity of the ball A after collision = 10 m/s

v' = final velocity of the ball B after collision = 15 m/s

using conservation of momentum

M V + m v = M V' + m v'

(5.0) (20) + m (10) = (5.0) (10) + m (15)

100 + 10 m= 50 + 15 m

5 m = 50

m= 10 m/s

Answer: 5

Explanation:

Answer:

1 or 2

Explanation:

By Newton's second law,

• the net vertical force on the box is

∑ F = n - mg = 0

where n = magnitude of the normal force, m = mass of the box, and g = acceleration due to gravity; then

n = mg = (20 kg) (9.8 m/s²) = 196 N

• the net horizontal force on the box is

∑ F = -f = -ma

where f = mag. of kinetic friction and a = acceleration of the box. Since

f = µn

where m is the coefficient of kinetic friction, so that

f = 0.5 (196 N) = 98 N

Then the box's acceleration is

-98 N = - (20 kg) a   →   a = (98 N)/(20 kg) = 4.9 m/s²

Answer:

True

Explanation:

External forces such as extreme weather pose a constant threat to the structural reliability of structures.

Extreme weather conditions such as a high temperature or rainfall have an effect on structures due to the constant exposure of the structures to this factors. The materials used in building these structures have different properties which are usually affected by environmental factors.

Answer:

a = F/m

a = 9.80÷ 10.0

a 0.98 m/s²

Answer:The magnetic field around an electromagnet is just the same as the one around a bar magnet. It can, however, be reversed by turning the battery around. Unlike bar magnets, which are permanent magnets, the magnetism of electromagnets can be turned on and off just by closing or opening the switch.

Answer:

[tex]a=3.90\ m/s^2[/tex]

Explanation:

Given that,

Initial velocity, u = 50 m/s

Final velocity, v = 75 m/s

DIstance, d = 400 m

We need to find the acceleration of the car. Let the acceleration of the car be a. We can use the third equation of motion to find it as follows :

[tex]v^2-u^2=2ad\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(75)^2-(50)^2}{2(400)}\\\\=\dfrac{3125}{2(400)}\\\\=3.90\ m/s^2[/tex]

So, the acceleration of the car is [tex]3.90\ m/s^2[/tex].

Answer:

Workdone = 30Nm

Explanation:

Given the following data;

Force = 10N

Distance = 3m

To find the workdone;

Workdone = force * distance

Substituting into the equation, we have

Workdone = 10 * 3

Workdone = 30Nm.

Therefore, the work involved in moving the box is 30 Newton-meter.

Answer: overjustification

Explanation:

The overjustification effect is a situation that occurs when an incentive like prizes or money or prizes leads to the reduction in an individual's intrinsic motivation that is necessary in performing a task.

In this case, because the children are motivated by money, when the take doesn't involve money anymore, they may not be willing to do it.

Answer:

The baseball was falling during 1.733 seconds.

Explanation:

The baseball experimented a free fall, which is a particular case of uniformly accelerated motion, in which object is accelerated by gravity. In this case, we need to determine the time spent by the ball before hitting the ground ([tex]t[/tex]), measured in seconds, which is determined by the following kinematic formula:

[tex]t = \frac{v-v_{o}}{g}[/tex] (1)

Where:

[tex]v_{o}[/tex], [tex]v[/tex] - Initial and final speeds of the baseball, measured in meters per second.

[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.

If we know that [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]v = 17\,\frac{m}{s}[/tex] and [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], then the time spent by the baseball is:

[tex]t = \frac{17\,\frac{m}{s}-0\,\frac{m}{s} }{9.807\,\frac{m}{s^{2}} }[/tex]

[tex]t = 1.733\,s[/tex]

The baseball was falling during 1.733 seconds.

Answer:

Explanation:

It is easier to see clothes with pointed needle than a blunt one because pressure exerted is more in a pointed needle as it occupies less space compared to blunt needle, A blunt has more surface area so the pressure exerted will less as compared to a pointed needle.

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Answer:

The speed of the car is 18.75 m/s

Explanation:

Impulse-Momentum Change Equation

The impulse received by an object is equal to the change in momentum:

Impulse = Change in momentum

The change in momentum is:

[tex]\Delta p=m\Delta v=m(v_2-v_1)[/tex]

Where m is the mass of the object, v2 is the final speed, and v1 is the initial speed. This means the impulse J is:

[tex]J=m(v_2-v_1)[/tex]

It's given an m=1,600 kg car is moving at v1=25 m/s North and then an impulse of J=-10,000 N.s is applied South. The minus sign indicates the impulse is opposite to the original direction of the velocity.

Solving for v2:

[tex]\displaystyle v_2=\frac{J}{m}+v_1[/tex]

Substituting:

[tex]\displaystyle v_2=\frac{-10,000}{1,600}+25[/tex]

[tex]\displaystyle v_2=-6.25+25=18.75[/tex]

[tex]v_2=18.75\ m/s[/tex]

The speed of the car is 18.75 m/s

Answer:

They do this by joining pieces of different Rock sequences together from different places in the whole world.

Explanation:

Geologic columns are basically an arrangement of rock layers whereby the newest rocks are at the top while the oldest rocks will be at the bottom. Thus, it is like a timescale that's used to find the age of rock formation on the earth around the world.

According to the information provided, the area showing abnormally high sea level is area C.

To identify the area of the sea with the highest level, we must take as a reference the colors of each region and to what parameters each one corresponds.

In this case we have a map with areas painted in blue, yellow, red and gray, that is, there are areas with the following characteristics.

Learn more about maps in: https://brainly.com/question/1670085

Answer:c

Explanation:test

Answer:

CaF₂

Explanation:

When calcium ions combine with fluoride ions calcium fluoride is formed.

The formula is ;

Ca²⁺+2 F¹→CaF₂

In this formula, Calcium ion has a charge of 2+ and the fluoride ion has a charge of 1-. Two fluoride ions are required to make the overall charge zero.

Answer:

The greater the luminosity of a star, the longer its period of oscillation.

Answer:

Hiii

The answer should be B)The same matter is recycled over and over.

Answer:

from 60 to 100.

Explanation:

Normal heart rates at rest: Children ages 6 - 15 70 – 100

Adults (age 18 and over) 60 – 100

Answer:

It allows people in different places and different countries to use the same units, avoid mistakes and understand each other more easily.

Answer:

The magnitude of the gravitational force of attraction between the two objects when they are 416 meters apart is;

D. 4.5 × 10⁻¹⁰ Newtons

Explanation:

The given parameters are;

The distance between the center of mass of the cow and the tractor, r = 208 m

The gravitational attraction between the cow and the tractor = 1.8 × 10⁻⁹ N

The formula for finding the gravitational force, 'F', between the cow and the tractor is given as follows;

[tex]F =G\cdot \dfrac{m_{1} \cdot m_{2}}{r^{2}}[/tex]

Where;

G = The universal gravitational constant = 6.67408 × 10⁻¹¹m³·kg⁻¹·s⁻²

m₁·m₂ = The product of the mass of the cow and the tractor

Therefore, we have;

[tex]F = 1.8 \times 10^{-9} =G\cdot \dfrac{m_{1} \cdot m_{2}}{208^{2}}[/tex]

1.8 × 10⁻⁹ × 208² ≈ 7.78752 × 10⁻⁵ = G × m₁ × m₂

Therefore, when the distance between the two objects are 416 meters apart, we have;

[tex]F = \dfrac{G \cdot m_{1} \cdot m_{2}}{r^{2}} = \dfrac{7.78752 \times 10^{-5}}{416^2} = 4.5 \times 10^{-10}[/tex]

The magnitude of the gravitational force of attraction between the cow and the tractor when they are 416 meters apart, F = 4.5 × 10⁻¹⁰ N.

Answer:

Forms over water, warm humid air mass, it's a polar air mass

Explanation: I think that's right sorry if it's not..

GL! :)

Answer:

300Nm

Explanation:

work = force x distance = 60x5=300

The work required to pull a sled by 5 meters using 60 N of force is 300 joules.

Work done in physics is defined as the dot product of force and displacement caused by it. Mathematically -

W = F.x

W = |F| |x| cos Ф

where Ф is the angle between force and displacement

Given is to calculate the work required to pull a sled by 5 meters by using 60 N of force.

We can write the following data -

Applied Force [F] = 60 Newtons

Displacement needed [x] = 5 meters

Angle between force and displacement [Ф] = 0°

Using the formula for work done, we can write -

W = |F| |x| cos Ф

W = 60 x 5 x cos(0)

W = 300 x 1

W = 300 Joules

Therefore, the work required to pull a sled by 5 meters using 60 N of force is 300 joules.

To solve more questions on Work, energy and power, visit the link below-

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#SPJ6

Answer:

Salt dissolving

Explanation:

Dis solving salt in water doesn't change it's chemical composition

Answer:

Iron Rusting

6th grade stuff or 5th i think

Explanation:

Answer:

Explanation:

0.02

0.604

70,230

becuase if you take away the 0 then it would change the value of the number

Answer:

What we see in the sky

Where are they in the general context of the overview of the Universe?

With the naked eye, the main astronomical objects we can see are the Sun, the Moon, the stars, and some of the planets

All of the stars we see are in the Milky Way galaxy, most of them relatively close to the Sun.

The stars we see in the sky come in a range of brightnesses, partly because stars come in different intrinsic brightnesses, and partly because some are closer than others.

When we look at an astronomical object ``by eye'', we can't tell just by looking how far away it is (because not all objects have the same intrinsic brightness). All we can see is what direction it is in.

As a result, when looking ``by eye'', the positions of stars on the sky are described by their direction only; you can imagine that the sky is a big sphere with astronomical objects located at different positions on it. This is called the celestial sphere

The positions of the stars can be described with a sort of astronomical longitude and latitude, called right ascension and declination.

Constellations are patterns of stars seen in the sky. However, although the stars in any constellation are all in the same general direction in the sky, the different stars in a constellation may be at very different distances from Earth, hence constellations may not be real associations of stars in space, just stars in the same general direction as seen from Earth.

Only the nearest galaxies are visible to the naked eye, as relatively faint smudges of light, although two of the very nearest galaxies, the Magellanic Clouds, are visible are moderately large clouds from the Southern hemisphere.

Motions in the sky

Hope this helps! :)